Commit Graph

438 Commits

Author SHA1 Message Date
Avi Kivity 3c6e276f22 KVM: x86 emulator: add SVM intercepts
Add intercept codes for instructions defined by SVM as
interceptable.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:57:00 -04:00
Avi Kivity c4f035c60d KVM: x86 emulator: add framework for instruction intercepts
When running in guest mode, certain instructions can be intercepted by
hardware.  This also holds for nested guests running on emulated
virtualization hardware, in particular instructions emulated by kvm
itself.

This patch adds a framework for intercepting instructions.  If an
instruction is marked for interception, and if we're running in guest
mode, a callback is called to check whether an intercept is needed or
not.  The callback is called at three points in time: immediately after
beginning execution, after checking privilge exceptions, and after
checking memory exception.  This suits the different interception points
defined for different instructions and for the various virtualization
instruction sets.

In addition, a new X86EMUL_INTERCEPT is defined, which any callback or
memory access may define, allowing the more complicated intercepts to be
implemented in existing callbacks.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:57:00 -04:00
Avi Kivity aa97bb4891 KVM: x86 emulator: implement movdqu instruction (f3 0f 6f, f3 0f 7f)
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:56:59 -04:00
Avi Kivity 1253791df9 KVM: x86 emulator: SSE support
Add support for marking an instruction as SSE, switching registers used
to the SSE register file.

Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:56:59 -04:00
Avi Kivity 0d7cdee83a KVM: x86 emulator: Specialize decoding for insns with 66/f2/f3 prefixes
Most SIMD instructions use the 66/f2/f3 prefixes to distinguish between
different variants of the same instruction.  Usually the encoding is quite
regular, but in some cases (including non-SIMD instructions) the prefixes
generate very different instructions.  Examples include XCHG/PAUSE,
MOVQ/MOVDQA/MOVDQU, and MOVBE/CRC32.

Allow the emulator to handle these special cases by splitting such opcodes
into groups, with different decode flags and execution functions for different
prefixes.

Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:56:59 -04:00
Avi Kivity 1d6b114f20 KVM: x86 emulator: do not munge rep prefix
Currently we store a rep prefix as 1 or 2 depending on whether it is a REPE or
REPNE.  Since sse instructions depend on the prefix value, store it as the
original opcode to simplify things further on.

Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-11 07:56:58 -04:00
Gleb Natapov 399a40c92d KVM: emulator: Fix permission checking in io permission bitmap
Currently if io port + len crosses 8bit boundary in io permission bitmap the
check may allow IO that otherwise should not be allowed. The patch fixes that.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-03-17 13:08:33 -03:00
Gleb Natapov 5601d05b8c KVM: emulator: Fix io permission checking for 64bit guest
Current implementation truncates upper 32bit of TR base address during IO
permission bitmap check. The patch fixes this.

Reported-and-tested-by: Francis Moreau <francis.moro@gmail.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2011-03-17 13:08:33 -03:00
Avi Kivity d867162c6d KVM: x86 emulator: vendor specific instructions
Mark some instructions as vendor specific, and allow the caller to request
emulation only of vendor specific instructions.  This is useful in some
circumstances (responding to a #UD fault).

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-03-17 13:08:28 -03:00
Andre Przywara dc25e89e07 KVM: SVM: copy instruction bytes from VMCB
In case of a nested page fault or an intercepted #PF newer SVM
implementations provide a copy of the faulting instruction bytes
in the VMCB.
Use these bytes to feed the instruction emulator and avoid the costly
guest instruction fetch in this case.

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:31:07 +02:00
Avi Kivity 35d3d4a1dd KVM: x86 emulator: simplify exception generation
Immediately after we generate an exception, we want a X86EMUL_PROPAGATE_FAULT
constant, so return it from the generation functions.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:58 +02:00
Avi Kivity db297e3d8e KVM: x86 emulator: tighen up ->read_std() and ->write_std() error checks
Instead of checking for X86EMUL_PROPAGATE_FAULT, check for any error,
making the callers more reliable.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:56 +02:00
Avi Kivity 42438e364c KVM: x86 emulator: drop dead pf injection in emulate_popf()
If rc == X86EMUL_PROPAGATE_FAULT, we would have returned earlier.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:55 +02:00
Avi Kivity bcc55cba9f KVM: x86 emulator: make emulator memory callbacks return full exception
This way, they can return #GP, not just #PF.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:54 +02:00
Avi Kivity da9cb575b1 KVM: x86 emulator: introduce struct x86_exception to communicate faults
Introduce a structure that can contain an exception to be passed back
to main kvm code.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:53 +02:00
Avi Kivity 30b31ab682 KVM: x86 emulator: do not perform address calculations on linear addresses
Linear addresses are supposed to already have segment checks performed on them;
if we play with these addresses the checks become invalid.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:36 +02:00
Avi Kivity 90de84f50b KVM: x86 emulator: preserve an operand's segment identity
Currently the x86 emulator converts the segment register associated with
an operand into a segment base which is added into the operand address.
This loss of information results in us not doing segment limit checks properly.

Replace struct operand's addr.mem field by a segmented_address structure
which holds both the effetive address and segment.  This will allow us to
do the limit check at the point of access.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:35 +02:00
Avi Kivity d53db5efc2 KVM: x86 emulator: drop DPRINTF()
Failed emulation is reported via a tracepoint; the cmps printk is pointless.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:33 +02:00
Avi Kivity 8a6bcaa6ef KVM: x86 emulator: drop unused #ifndef __KERNEL__
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2011-01-12 11:29:32 +02:00
Nicolas Kaiser 9611c18777 KVM: fix typo in copyright notice
Fix typo in copyright notice.

Signed-off-by: Nicolas Kaiser <nikai@nikai.net>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:53:14 +02:00
Sheng Yang 7129eecac1 KVM: x86 emulator: Eliminate compilation warning in x86_decode_insn()
Eliminate:
arch/x86/kvm/emulate.c:801: warning: ‘sv’ may be used uninitialized in this
function

on gcc 4.1.2

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:53:09 +02:00
Joerg Roedel d47f00a62b KVM: X86: Propagate fetch faults
KVM currently ignores fetch faults in the instruction
emulator. With nested-npt we could have such faults. This
patch adds the code to handle these.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:52:41 +02:00
Joerg Roedel 8df25a328a KVM: MMU: Track page fault data in struct vcpu
This patch introduces a struct with two new fields in
vcpu_arch for x86:

	* fault.address
	* fault.error_code

This will be used to correctly propagate page faults back
into the guest when we could have either an ordinary page
fault or a nested page fault. In the case of a nested page
fault the fault-address is different from the original
address that should be walked. So we need to keep track
about the real fault-address.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:52:33 +02:00
Avi Kivity 7d9ddaedd8 KVM: x86 emulator: clean up control flow in x86_emulate_insn()
x86_emulate_insn() is full of things like

    if (rc != X86EMUL_CONTINUE)
        goto done;
    break;

consolidate all of those at the end of the switch statement.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:54 +02:00
Avi Kivity a4d4a7c188 KVM: x86 emulator: fix group 11 decoding for reg != 0
These are all undefined.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:53 +02:00
Avi Kivity b9eac5f4d1 KVM: x86 emulator: use single stage decoding for mov instructions
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:52 +02:00
Avi Kivity 6230f7fc04 KVM: x86 emulator: simplify ALU opcode block decode further
The ALU opcode block is very regular; introduce D6ALU() to define decode
flags for 6 instructions at a time.

Suggested by Paolo Bonzini.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:43 +02:00
Avi Kivity 34d1f4905e KVM: x86 emulator: trap and propagate #DE from DIV and IDIV
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:42 +02:00
Avi Kivity f6b3597bde KVM: x86 emulator: add macros for executing instructions that may trap
Like DIV and IDIV.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:41 +02:00
Avi Kivity 739ae40606 KVM: x86 emulator: simplify instruction decode flags for opcodes 0F 00-FF
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:41 +02:00
Avi Kivity d269e3961a KVM: x86 emulator: simplify instruction decode flags for opcodes E0-FF
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:40 +02:00
Avi Kivity d2c6c7adb1 KVM: x86 emulator: simplify instruction decode flags for opcodes C0-DF
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:39 +02:00
Avi Kivity 50748613d1 KVM: x86 emulator: simplify instruction decode flags for opcodes A0-AF
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:38 +02:00
Avi Kivity 76e8e68d44 KVM: x86 emulator: simplify instruction decode flags for opcodes 80-8F
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:38 +02:00
Avi Kivity 48fe67b5f7 KVM: x86 emulator: simplify string instruction decode flags
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:37 +02:00
Avi Kivity 5315fbb223 KVM: x86 emulator: simplify ALU block (opcodes 00-3F) decode flags
Use the new byte/word dual opcode decode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:36 +02:00
Avi Kivity 8d8f4e9f66 KVM: x86 emulator: support byte/word opcode pairs
Many x86 instructions come in byte and word variants distinguished with bit
0 of the opcode.  Add macros to aid in defining them.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:35 +02:00
Avi Kivity 081bca0e6b KVM: x86 emulator: refuse SrcMemFAddr (e.g. LDS) with register operand
SrcMemFAddr is not defined with the modrm operand designating a register
instead of a memory address.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:35 +02:00
Gleb Natapov d2ddd1c483 KVM: x86 emulator: get rid of "restart" in emulation context.
x86_emulate_insn() will return 1 if instruction can be restarted
without re-entering a guest.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:34 +02:00
Gleb Natapov 3e2f65d57a KVM: x86 emulator: move string instruction completion check into separate function
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:33 +02:00
Gleb Natapov 6e2fb2cadd KVM: x86 emulator: Rename variable that shadows another local variable.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:32 +02:00
Wei Yongjun cc4feed57f KVM: x86 emulator: add CALL FAR instruction emulation (opcode 9a)
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:31 +02:00
Wei Yongjun e4abac67b7 KVM: x86 emulator: add JrCXZ instruction emulation
Add JrCXZ instruction emulation (opcode 0xe3)
Used by FreeBSD boot loader.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:20 +02:00
Wei Yongjun 09b5f4d3c4 KVM: x86 emulator: add LDS/LES/LFS/LGS/LSS instruction emulation
Add LDS/LES/LFS/LGS/LSS instruction emulation.
(opcode 0xc4, 0xc5, 0x0f 0xb2, 0x0f 0xb4~0xb5)

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:51:20 +02:00
Avi Kivity 6142914280 KVM: x86 emulator: implement CWD (opcode 99)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:16 +02:00
Avi Kivity d46164dbd9 KVM: x86 emulator: implement IMUL REG, R/M, IMM (opcode 69)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:16 +02:00
Avi Kivity 7db41eb762 KVM: x86 emulator: add Src2Imm decoding
Needed for 3-operand IMUL.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:15 +02:00
Avi Kivity 39f21ee546 KVM: x86 emulator: consolidate immediate decode into a function
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:14 +02:00
Avi Kivity 48bb5d3c40 KVM: x86 emulator: implement RDTSC (opcode 0F 31)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:14 +02:00
Avi Kivity 7077aec0bc KVM: x86 emulator: remove SrcImplicit
Useless.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:13 +02:00
Avi Kivity 5c82aa2998 KVM: x86 emulator: implement IMUL REG, R/M (opcode 0F AF)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:12 +02:00
Avi Kivity f3a1b9f496 KVM: x86 emulator: implement IMUL REG, R/M, imm8 (opcode 6B)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:12 +02:00
Avi Kivity 40ece7c729 KVM: x86 emulator: implement RET imm16 (opcode C2)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:12 +02:00
Avi Kivity b250e60589 KVM: x86 emulator: add SrcImmU16 operand type
Used for RET NEAR instructions.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:12 +02:00
Avi Kivity 0ef753b8c3 KVM: x86 emulator: implement CALL FAR (FF /3)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:12 +02:00
Avi Kivity 7af04fc05c KVM: x86 emulator: implement DAS (opcode 2F)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:11 +02:00
Avi Kivity fb2c264105 KVM: x86 emulator: Use a register for ____emulate_2op() destination
Most x86 two operand instructions allow the destination to be a memory operand,
but IMUL (for example) requires that the destination be a register.  Change
____emulate_2op() to take a register for both source and destination so we
can invoke IMUL.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:11 +02:00
Avi Kivity b3b3d25a12 KVM: x86 emulator: pass destination type to ____emulate_2op()
We'll need it later so we can use a register for the destination.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:11 +02:00
Wei Yongjun f2f3184534 KVM: x86 emulator: add LOOP/LOOPcc instruction emulation
Add LOOP/LOOPcc instruction emulation (opcode 0xe0~0xe2).

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:11 +02:00
Wei Yongjun e8b6fa70e3 KVM: x86 emulator: add CBW/CWDE/CDQE instruction emulation
Add CBW/CWDE/CDQE instruction emulation.(opcode 0x98)
Used by FreeBSD's boot loader.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:11 +02:00
Avi Kivity 0fa6ccbd28 KVM: x86 emulator: fix REPZ/REPNZ termination condition
EFLAGS.ZF needs to be checked after each iteration, not before.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:10 +02:00
Avi Kivity f6b33fc504 KVM: x86 emulator: implement SCAS (opcodes AE, AF)
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:10 +02:00
Avi Kivity 5c56e1cf7a KVM: x86 emulator: fix INTn emulation not pushing EFLAGS and CS
emulate_push() only schedules a push; it doesn't actually push anything.
Call writeback() to flush out the write.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:09 +02:00
Wei Yongjun a13a63faa6 KVM: x86 emulator: remove dup code of in/out instruction
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:09 +02:00
Wei Yongjun 41167be544 KVM: x86 emulator: change OUT instruction to use dst instead of src
Change OUT instruction to use dst instead of src, so we can
reuse those code for all out instructions.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:09 +02:00
Wei Yongjun 943858e275 KVM: x86 emulator: introduce DstImmUByte for dst operand decode
Introduce DstImmUByte for dst operand decode, which
will be used for out instruction.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:09 +02:00
Wei Yongjun c483c02ad3 KVM: x86 emulator: remove useless label from x86_emulate_insn()
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:09 +02:00
Wei Yongjun ee45b58efe KVM: x86 emulator: add setcc instruction emulation
Add setcc instruction emulation (opcode 0x0f 0x90~0x9f)

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:08 +02:00
Wei Yongjun 92f738a52b KVM: x86 emulator: add XADD instruction emulation
Add XADD instruction emulation (opcode 0x0f 0xc0~0xc1)

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:06 +02:00
Wei Yongjun 31be40b398 KVM: x86 emulator: put register operand write back to a function
Introduce function write_register_operand() to write back the
register operand.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:06 +02:00
Wei Yongjun d9574a25af KVM: x86 emulator: add bsf/bsr instruction emulation
Add bsf/bsr instruction emulation (opcode 0x0f 0xbc~0xbd)

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:04 +02:00
Mohammed Gamal 8c5eee30a9 KVM: x86 emulator: Fix emulate_grp3 return values
This patch lets emulate_grp3() return X86EMUL_* return codes instead
of hardcoded ones.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:04 +02:00
Mohammed Gamal 3f9f53b0d5 KVM: x86 emulator: Add unary mul, imul, div, and idiv instructions
This adds unary mul, imul, div, and idiv instructions (group 3 r/m 4-7).

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:04 +02:00
Wei Yongjun ba7ff2b76d KVM: x86 emulator: mask group 8 instruction as BitOp
Mask group 8 instruction as BitOp, so we can share the
code for adjust the source operand.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:03 +02:00
Wei Yongjun 3885f18fe3 KVM: x86 emulator: do not adjust the address for immediate source
adjust the dst address for a register source but not adjust the
address for an immediate source.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:02 +02:00
Wei Yongjun 35c843c485 KVM: x86 emulator: fix negative bit offset BitOp instruction emulation
If bit offset operands is a negative number, BitOp instruction
will return wrong value. This patch fix it.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:01 +02:00
Mohammed Gamal 8744aa9aad KVM: x86 emulator: Add stc instruction (opcode 0xf9)
Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:01 +02:00
Wei Yongjun c034da8b92 KVM: x86 emulator: using SrcOne for instruction d0/d1 decoding
Using SrcOne for instruction d0/d1 decoding.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:00 +02:00
Wei Yongjun 36089fed70 KVM: x86 emulator: disable writeback when decode dest operand
This patch change to disable writeback when decode dest
operand if the dest type is ImplicitOps or not specified.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:00 +02:00
Wei Yongjun 06cb704611 KVM: x86 emulator: use SrcAcc to simplify stos decoding
Use SrcAcc to simplify stos decoding.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:00 +02:00
Mohammed Gamal 6e154e56b4 KVM: x86 emulator: Add into, int, and int3 instructions (opcodes 0xcc-0xce)
This adds support for int instructions to the emulator.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:51:00 +02:00
Wei Yongjun d3ad624329 KVM: x86 emulator: simplify two-byte opcode check
Two-byte opcode always start with 0x0F and the decode flags
of opcode 0xF0 is always 0, so remove dup check.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:59 +02:00
Mohammed Gamal 34698d8c61 KVM: x86 emulator: Fix nop emulation
If a nop instruction is encountered, we jump directly to the done label.
This skip updating rip. Break from the switch case instead

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:41 +02:00
Avi Kivity 2dbd0dd711 KVM: x86 emulator: Decode memory operands directly into a 'struct operand'
Since modrm operand can be either register or memory, decoding it into
a 'struct operand', which can represent both, is simpler.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:40 +02:00
Avi Kivity 1f6f05800e KVM: x86 emulator: change invlpg emulation to use src.mem.addr
Instead of using modrm_ea, which will soon be gone.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:39 +02:00
Avi Kivity 342fc63095 KVM: x86 emulator: switch LEA to use SrcMem decoding
The NoAccess flag will prevent memory from being accessed.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:38 +02:00
Avi Kivity 5a506b125f KVM: x86 emulator: add NoAccess flag for memory instructions that skip access
Use for INVLPG, which accesses the tlb, not memory.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:37 +02:00
Avi Kivity b27f38563d KVM: x86 emulator: use struct operand for mov reg,dr and mov dr,reg for reg op
This is an ordinary modrm source or destination; use the standard structure
representing it.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:36 +02:00
Avi Kivity 1a0c7d44e4 KVM: x86 emulator: use struct operand for mov reg,cr and mov cr,reg for reg op
This is an ordinary modrm source or destination; use the standard structure
representing it.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:35 +02:00
Avi Kivity cecc9e3916 KVM: x86 emulator: mark mov cr and mov dr as 64-bit instructions in long mode
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:35 +02:00
Avi Kivity 7f9b4b75be KVM: x86 emulator: introduce Op3264 for mov cr and mov dr instructions
The operands for these instructions are 32 bits or 64 bits, depending on
long mode, and ignoring REX prefixes, or the operand size prefix.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:35 +02:00
Avi Kivity 1e87e3efe7 KVM: x86 emulator: simplify REX.W check
(x && (x & y)) == (x & y)

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:34 +02:00
Avi Kivity d4709c78ee KVM: x86 emulator: drop use_modrm_ea
Unused (and has never been).

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:34 +02:00
Avi Kivity 91ff3cb43c KVM: x86 emulator: put register operand fetch into a function
The code is repeated three times, put it into fetch_register_operand()

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:33 +02:00
Avi Kivity 3d9e77dff8 KVM: x86 emulator: use SrcAcc to simplify xchg decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:33 +02:00
Avi Kivity 4515453964 KVM: x86 emulator: simplify xchg decode tables
Use X8() to avoid repetition.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:33 +02:00
Avi Kivity 1a6440aef6 KVM: x86 emulator: use correct type for memory address in operands
Currently we use a void pointer for memory addresses.  That's wrong since
these are guest virtual addresses which are not directly dereferencable by
the host.

Use the correct type, unsigned long.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:33 +02:00
Avi Kivity 09ee57cdae KVM: x86 emulator: push segment override out of decode_modrm()
Let it compute modrm_seg instead, and have the caller apply it.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:33 +02:00
Gleb Natapov 4fc40f076f KVM: x86 emulator: check io permissions only once for string pio
Do not recheck io permission on every iteration.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:29 +02:00
Avi Kivity 9928ff608b KVM: x86 emulator: fix LMSW able to clear cr0.pe
LMSW is documented not to be able to clear cr0.pe; make it so.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-10-24 10:50:28 +02:00
Avi Kivity 63540382cc KVM: x86 emulator: convert some push instructions to direct decode
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:26 +02:00
Avi Kivity d0e533255d KVM: x86 emulator: allow repeat macro arguments to contain commas
Needed for repeating instructions with execution functions.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:25 +02:00
Avi Kivity 73fba5f4fe KVM: x86 emulator: move decode tables downwards
So they can reference execution functions.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:25 +02:00
Avi Kivity dde7e6d12a KVM: x86 emulator: move x86_decode_insn() downwards
No code changes.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:24 +02:00
Avi Kivity ef65c88912 KVM: x86 emulator: allow storing emulator execution function in decode tables
Instead of looking up the opcode twice (once for decode flags, once for
the big execution switch) look up both flags and function in the decode tables.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:22 +02:00
Avi Kivity 9aabc88fc8 KVM: x86 emulator: store x86_emulate_ops in emulation context
It doesn't ever change, so we don't need to pass it around everywhere.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:21 +02:00
Avi Kivity ab85b12b1a KVM: x86 emulator: move ByteOp and Dst back to bits 0:3
Now that the group index no longer exists, the space is free.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:20 +02:00
Avi Kivity 3885d530b0 KVM: x86 emulator: drop support for old-style groups
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:19 +02:00
Avi Kivity 9f5d3220e3 KVM: x86 emulator: convert group 9 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:18 +02:00
Avi Kivity 2cb20bc8af KVM: x86 emulator: convert group 8 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:18 +02:00
Avi Kivity 2f3a9bc9eb KVM: x86 emulator: convert group 7 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:16 +02:00
Avi Kivity b67f9f0741 KVM: x86 emulator: convert group 5 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:15 +02:00
Avi Kivity 591c9d20a3 KVM: x86 emulator: convert group 4 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:14 +02:00
Avi Kivity ee70ea30ee KVM: x86 emulator: convert group 3 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:13 +02:00
Avi Kivity 99880c5cd5 KVM: x86 emulator: convert group 1A to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:12 +02:00
Avi Kivity 5b92b5faff KVM: x86 emulator: convert group 1 to new style
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:11 +02:00
Avi Kivity 120df8902d KVM: x86 emulator: allow specifying group directly in opcode
Instead of having a group number, store the group table pointer directly in
the opcode.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:10 +02:00
Avi Kivity 793d5a8d6b KVM: x86 emulator: reserve group code 0
We'll be using that to distinguish between new-style and old-style groups.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:09 +02:00
Avi Kivity 42a1c52095 KVM: x86 emulator: move group tables to top
No code changes.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:08 +02:00
Avi Kivity fd853310a1 KVM: x86 emulator: Add wrappers for easily defining opcodes
Once 'struct opcode' grows, its initializer will become more complicated.
Wrap the simple initializers in a D() macro, and replace the empty initializers
with an even simpler N macro.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:08 +02:00
Avi Kivity d65b1dee40 KVM: x86 emulator: introduce 'struct opcode'
This will hold all the information known about the opcode.  Currently, this
is just the decode flags.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:07 +02:00
Avi Kivity ea9ef04e19 KVM: x86 emulator: drop parentheses in repreat macros
The parenthese make is impossible to use the macros with initializers that
require braces.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:06 +02:00
Mohammed Gamal 62bd430e6d KVM: x86 emulator: Add IRET instruction
Ths patch adds IRET instruction (opcode 0xcf).
Currently, only IRET in real mode is emulated. Protected mode support is to be added later if needed.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Reviewed-by: Avi Kivity <avi@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:05 +02:00
Avi Kivity e071edd5ba KVM: x86 emulator: unify the two Group 3 variants
Use just one group table for byte (F6) and word (F7) opcodes.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:50:00 +02:00
Avi Kivity dfe11481d8 KVM: x86 emulator: Allow LOCK prefix for NEG and NOT
Opcodes F6/2, F6/3, F7/2, F7/3.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:59 +02:00
Avi Kivity 4968ec4e26 KVM: x86 emulator: simplify Group 1 decoding
Move operand decoding to the opcode table, keep lock decoding in the group
table.  This allows us to get consolidate the four variants of Group 1 into one
group.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:58 +02:00
Avi Kivity 52811d7de5 KVM: x86 emulator: mix decode bits from opcode and group decode tables
Allow bits that are common to all members of a group to be specified in the
opcode table instead of the group table.  This allows some simplification
of the decode tables.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:58 +02:00
Avi Kivity 047a481809 KVM: x86 emulator: add Undefined decode flag
Add a decode flag to indicate the instruction is invalid.  Will come in useful
later, when we mix decode bits from the opcode and group table.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:57 +02:00
Avi Kivity 2ce495365f KVM: x86 emulator: Make group storage bits separate from operand bits
Currently group bits are stored in bits 0:7, where operand bits are stored.

Make group bits be 0:3, and move the existing bits 0:3 to 16:19, so we can
mix group and operand bits.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:55 +02:00
Avi Kivity 880a188378 KVM: x86 emulator: consolidate Jcc rel32 decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:55 +02:00
Avi Kivity be8eacddbd KVM: x86 emulator: consolidate CMOVcc decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:53 +02:00
Avi Kivity b6e6153885 KVM: x86 emulator: consolidate MOV reg, imm decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:52 +02:00
Avi Kivity b3ab3405fe KVM: x86 emulator: consolidate Jcc rel8 decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:51 +02:00
Avi Kivity 3849186c38 KVM: x86 emulator: consolidate push/pop reg decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:49 +02:00
Avi Kivity 749358a6b4 KVM: x86 emulator: consolidate inc/dec reg decoding
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:48 +02:00
Avi Kivity 83babbca46 KVM: x86 emulator: add macros for repetitive instructions
Some instructions are repetitive in the opcode space, add macros for
consolidating them.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:48 +02:00
Avi Kivity 91269b8f94 KVM: x86 emulator: fix handling for unemulated instructions
If an instruction is present in the decode tables but not in the execution
switch, it will be emulated as a NOP.  An example is IRET (0xcf).

Fix by adding default: labels to the execution switches.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-10-24 10:49:47 +02:00
Avi Kivity 16518d5ada KVM: x86 emulator: fix regression with cmpxchg8b on i386 hosts
operand::val and operand::orig_val are 32-bit on i386, whereas cmpxchg8b
operands are 64-bit.

Fix by adding val64 and orig_val64 union members to struct operand, and
using them where needed.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-09-08 14:50:55 -03:00
Gleb Natapov c0e0608cb9 KVM: x86: emulator: inc/dec can have lock prefix
Mark inc (0xfe/0 0xff/0) and dec (0xfe/1 0xff/1) as lock prefix capable.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-02 06:40:49 +03:00
Wei Yongjun 5d55f299f9 KVM: x86 emulator: re-implementing 'mov AL,moffs' instruction decoding
This patch change to use DstAcc for decoding 'mov AL, moffs'
and introduced SrcAcc for decoding 'mov moffs, AL'.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:27 +03:00
Wei Yongjun 07cbc6c185 KVM: x86 emulator: fix cli/sti instruction emulation
If IOPL check fail, the cli/sti emulate GP and then we should
skip writeback since the default write OP is OP_REG.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:26 +03:00
Wei Yongjun b16b2b7bb5 KVM: x86 emulator: fix 'mov rm,sreg' instruction decoding
The source operand of 'mov rm,sreg' is segment register, not
general-purpose register, so remove SrcReg from decoding.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:25 +03:00
Wei Yongjun e97e883f8b KVM: x86 emulator: fix 'and AL,imm8' instruction decoding
'and AL,imm8' should be mask as ByteOp, otherwise the dest operand
length will no correct and we may fill the full EAX when writeback.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:24 +03:00
Wei Yongjun ce7a0ad3bd KVM: x86 emulator: fix the comment of out instruction
Fix the comment of out instruction, using the same style as the
other instructions.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:23 +03:00
Wei Yongjun a5046e6c7d KVM: x86 emulator: fix 'mov sreg,rm16' instruction decoding
Memory reads for 'mov sreg,rm16' should be 16 bits only.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-02 06:40:22 +03:00
Sheng Yang f5f48ee15c KVM: VMX: Execute WBINVD to keep data consistency with assigned devices
Some guest device driver may leverage the "Non-Snoop" I/O, and explicitly
WBINVD or CLFLUSH to a RAM space. Since migration may occur before WBINVD or
CLFLUSH, we need to maintain data consistency either by:
1: flushing cache (wbinvd) when the guest is scheduled out if there is no
wbinvd exit, or
2: execute wbinvd on all dirty physical CPUs when guest wbinvd exits.

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01 10:47:21 +03:00
Wei Yongjun 7d5993d63f KVM: x86 emulator: fix group3 instruction decoding
Group 3 instruction with ModRM reg field as 001 is
defined as test instruction under AMD arch, and
emulate_grp3() is ready for emulate it, so fix the
decoding.

static inline int emulate_grp3(...)
{
	...
	switch (c->modrm_reg) {
	case 0 ... 1:   /* test */
		emulate_2op_SrcV("test", c->src, c->dst, ctxt->eflags);
	...
}

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:46:55 +03:00
Wei Yongjun c37eda1384 KVM: x86 emulator: fix pusha instruction emulation
emulate pusha instruction only writeback the last
EDI register, but the other registers which need
to be writeback is ignored. This patch fixed it.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01 10:46:48 +03:00
Avi Kivity 221d059d15 KVM: Update Red Hat copyrights
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:51 +03:00
Mohammed Gamal 222b7c52c3 KVM: x86 emulator: Add missing decoder flags for xor instructions
This adds missing decoder flags for xor instructions (opcodes 0x34 - 0x35)

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01 10:35:44 +03:00
Mohammed Gamal abc190830f KVM: x86 emulator: Add missing decoder flags for sub instruction
This adds missing decoder flags for sub instructions (opcodes 0x2c - 0x2d)

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01 10:35:44 +03:00
Mohammed Gamal dfb507c41d KVM: x86 emulator: Add test acc, imm instruction (opcodes 0xA8 - 0xA9)
This adds test acc, imm instruction to the x86 emulator

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-08-01 10:35:43 +03:00
Gleb Natapov 54b8486f46 KVM: x86 emulator: do not inject exception directly into vcpu
Return exception as a result of instruction emulation and handle
injection in KVM code.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:37 +03:00
Gleb Natapov 95cb229530 KVM: x86 emulator: move interruptibility state tracking out of emulator
Emulator shouldn't access vcpu directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:36 +03:00
Gleb Natapov 4d2179e1e9 KVM: x86 emulator: handle shadowed registers outside emulator
Emulator shouldn't access vcpu directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:36 +03:00
Gleb Natapov bdb475a323 KVM: x86 emulator: use shadowed register in emulate_sysexit()
emulate_sysexit() should use shadowed registers copy instead of
looking into vcpu state directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:36 +03:00
Gleb Natapov ef050dc039 KVM: x86 emulator: set RFLAGS outside x86 emulator code
Removes the need for set_flags() callback.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:35 +03:00
Gleb Natapov 95c5588652 KVM: x86 emulator: advance RIP outside x86 emulator code
Return new RIP as part of instruction emulation result instead of
updating KVM's RIP from x86 emulator code.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:35 +03:00
Gleb Natapov 8fe681e984 KVM: do not inject #PF in (read|write)_emulated() callbacks
Return error to x86 emulator instead of injection exception behind its back.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:34 +03:00
Gleb Natapov 338dbc9781 KVM: x86 emulator: make (get|set)_dr() callback return error if it fails
Make (get|set)_dr() callback return error if it fails instead of
injecting exception behind emulator's back.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:32 +03:00
Gleb Natapov 0f12244fe7 KVM: x86 emulator: make set_cr() callback return error if it fails
Make set_cr() callback return error if it fails instead of injecting #GP
behind emulator's back.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:31 +03:00
Gleb Natapov 79168fd1a3 KVM: x86 emulator: cleanup some direct calls into kvm to use existing callbacks
Use callbacks from x86_emulate_ops to access segments instead of calling
into kvm directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:31 +03:00
Gleb Natapov 5951c44237 KVM: x86 emulator: add get_cached_segment_base() callback to x86_emulate_ops
On VMX it is expensive to call get_cached_descriptor() just to get segment
base since multiple vmcs_reads are done instead of only one. Introduce
new call back get_cached_segment_base() for efficiency.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:31 +03:00
Gleb Natapov 3fb1b5dbd3 KVM: x86 emulator: add (set|get)_msr callbacks to x86_emulate_ops
Add (set|get)_msr callbacks to x86_emulate_ops instead of calling
them directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:30 +03:00
Gleb Natapov 35aa5375d4 KVM: x86 emulator: add (set|get)_dr callbacks to x86_emulate_ops
Add (set|get)_dr callbacks to x86_emulate_ops instead of calling
them directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:30 +03:00
Gleb Natapov 414e6277fd KVM: x86 emulator: handle "far address" source operand
ljmp/lcall instruction operand contains address and segment.
It can be 10 bytes long. Currently we decode it as two different
operands. Fix it by introducing new kind of operand that can hold
entire far address.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:30 +03:00
Gleb Natapov b8a98945ea KVM: x86 emulator: cleanup nop emulation
Make it more explicit what we are checking for.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:29 +03:00
Gleb Natapov f0c13ef1a8 KVM: x86 emulator: cleanup xchg emulation
Dst operand is already initialized during decoding stage. No need to
reinitialize.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:29 +03:00
Gleb Natapov 054fe9f6e3 KVM: x86 emulator: fix Move r/m16 to segment register decoding
This instruction does not need generic decoding for its dst operand.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:28 +03:00
Gleb Natapov 9de4157367 KVM: x86 emulator: introduce read cache
Introduce read cache which is needed for instruction that require more
then one exit to userspace. After returning from userspace the instruction
will be re-executed with cached read value.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-08-01 10:35:28 +03:00
Gleb Natapov 19d0443726 KVM: fix emulator_task_switch() return value.
emulator_task_switch() should return -1 for failure and 0 for success to
the caller, just like x86_emulate_insn() does.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:17:49 +03:00
Jan Kiszka e269fb2189 KVM: x86: Push potential exception error code on task switches
When a fault triggers a task switch, the error code, if existent, has to
be pushed on the new task's stack. Implement the missing bits.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:17:46 +03:00
Jan Kiszka 0760d44868 KVM: x86: Terminate early if task_switch_16/32 failed
Stop the switch immediately if task_switch_16/32 returned an error. Only
if that step succeeded, the switch should actually take place and update
any register states.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:17:44 +03:00
Avi Kivity 2fb53ad811 KVM: x86 emulator: Don't overwrite decode cache
Currently if we an instruction spans a page boundary, when we fetch the
second half we overwrite the first half.  This prevents us from tracing
the full instruction opcodes.

Fix by appending the second half to the first.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:17:33 +03:00
Gleb Natapov de3e6480f7 KVM: x86 emulator: fix unlocked CMPXCHG8B emulation
When CMPXCHG8B is executed without LOCK prefix it is racy. Preserve this
behaviour in emulator too.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17 12:16:38 +03:00
Gleb Natapov 6550e1f165 KVM: x86 emulator: add decoding of CMPXCHG8B dst operand
Decode CMPXCHG8B destination operand in decoding stage. Fixes regression
introduced by "If LOCK prefix is used dest arg should be memory" commit.
This commit relies on dst operand be decoded at the beginning of an
instruction emulation.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17 12:16:37 +03:00
Gleb Natapov 482ac18ae2 KVM: x86 emulator: commit rflags as part of registers commit
Make sure that rflags is committed only after successful instruction
emulation.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-17 12:16:35 +03:00
Gleb Natapov 7b262e90fc KVM: x86 emulator: introduce pio in string read ahead.
To optimize "rep ins" instruction do IO in big chunks ahead of time
instead of doing it only when required during instruction emulation.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:31 +03:00
Gleb Natapov 5cd21917da KVM: x86 emulator: restart string instruction without going back to a guest.
Currently when string instruction is only partially complete we go back
to a guest mode, guest tries to reexecute instruction and exits again
and at this point emulation continues. Avoid all of this by restarting
instruction without going back to a guest mode, but return to a guest
mode each 1024 iterations to allow interrupt injection. Pending
exception causes immediate guest entry too.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:29 +03:00
Gleb Natapov cb404fe089 KVM: x86 emulator: remove saved_eip
c->eip is never written back in case of emulation failure, so no need to
set it to old value.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:28 +03:00
Gleb Natapov 7972995b0c KVM: x86 emulator: Move string pio emulation into emulator.c
Currently emulation is done outside of emulator so things like doing
ins/outs to/from mmio are broken it also makes it hard (if not impossible)
to implement single stepping in the future. The implementation in this
patch is not efficient since it exits to userspace for each IO while
previous implementation did 'ins' in batches. Further patch that
implements pio in string read ahead address this problem.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:26 +03:00
Gleb Natapov cf8f70bfe3 KVM: x86 emulator: fix in/out emulation.
in/out emulation is broken now. The breakage is different depending
on where IO device resides. If it is in userspace emulator reports
emulation failure since it incorrectly interprets kvm_emulate_pio()
return value. If IO device is in the kernel emulation of 'in' will do
nothing since kvm_emulate_pio() stores result directly into vcpu
registers, so emulator will overwrite result of emulation during
commit of shadowed register.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:25 +03:00
Gleb Natapov d9271123a4 KVM: x86 emulator: during rep emulation decrement ECX only if emulation succeeded
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:23 +03:00
Gleb Natapov a682e35449 KVM: x86 emulator: add decoding of X,Y parameters from Intel SDM
Add decoding of X,Y parameters from Intel SDM which are used by string
instruction to specify source and destination. Use this new decoding
to implement movs, cmps, stos, lods in a generic way.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:21 +03:00
Gleb Natapov 69f55cb11e KVM: x86 emulator: populate OP_MEM operand during decoding.
All struct operand fields are initialized during decoding for all
operand types except OP_MEM, but there is no reason for that. Move
OP_MEM operand initialization into decoding stage for consistency.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:20 +03:00
Gleb Natapov ceffb45972 KVM: Use task switch from emulator.c
Remove old task switch code from x86.c

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:18 +03:00
Gleb Natapov 2e873022f5 KVM: x86 emulator: Use load_segment_descriptor() instead of kvm_load_segment_descriptor()
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:17 +03:00
Gleb Natapov 38ba30ba51 KVM: x86 emulator: Emulate task switch in emulator.c
Implement emulation of 16/32 bit task switch in emulator.c

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:15 +03:00
Gleb Natapov aca06a8307 KVM: x86 emulator: cleanup grp3 return value
When x86_emulate_insn() does not know how to emulate instruction it
exits via cannot_emulate label in all cases except when emulating
grp3. Fix that.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:12 +03:00
Gleb Natapov a41ffb7540 KVM: x86 emulator: If LOCK prefix is used dest arg should be memory.
If LOCK prefix is used dest arg should be memory, otherwise instruction
should generate #UD.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:11 +03:00
Gleb Natapov fd5253658b KVM: x86 emulator: do not call writeback if msr access fails.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:09 +03:00
Gleb Natapov 2e901c4cf4 KVM: x86 emulator: fix return values of syscall/sysenter/sysexit emulations
Return X86EMUL_PROPAGATE_FAULT is fault was injected. Also inject #UD
for those instruction when appropriate.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:08 +03:00
Gleb Natapov 1e470be5a1 KVM: x86 emulator: fix mov dr to inject #UD when needed.
If CR4.DE=1 access to registers DR4/DR5 cause #UD.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:06 +03:00
Gleb Natapov 6aebfa6ea7 KVM: x86 emulator: inject #UD on access to non-existing CR
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:05 +03:00
Gleb Natapov ab8557b2b3 KVM: x86 emulator: 0f (20|21|22|23) ignore mod bits.
Resent spec says that for 0f (20|21|22|23) the 2 bits in the mod field
are ignored. Interestingly enough older spec says that 11 is only valid
encoding.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:03 +03:00
Gleb Natapov 6e1e5ffee8 KVM: x86 emulator: fix 0f 01 /5 emulation
It is undefined and should generate #UD.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:02 +03:00
Gleb Natapov 5e3ae6c540 KVM: x86 emulator: fix mov r/m, sreg emulation.
mov r/m, sreg generates #UD ins sreg is incorrect.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:16:00 +03:00
Gleb Natapov 063db061b9 KVM: Provide current eip as part of emulator context.
Eliminate the need to call back into KVM to get it from emulator.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:59 +03:00
Gleb Natapov 9c5372445c KVM: Provide x86_emulate_ctxt callback to get current cpl
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:57 +03:00
Gleb Natapov 93a152be5a KVM: remove realmode_lmsw function.
Use (get|set)_cr callback to emulate lmsw inside emulator.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:56 +03:00
Gleb Natapov 52a4661737 KVM: Provide callback to get/set control registers in emulator ops.
Use this callback instead of directly call kvm function. Also rename
realmode_(set|get)_cr to emulator_(set|get)_cr since function has nothing
to do with real mode.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:54 +03:00
Gleb Natapov 49c6799a2c KVM: Remove pointer to rflags from realmode_set_cr parameters.
Mov reg, cr instruction doesn't change flags in any meaningful way, so
no need to update rflags after instruction execution.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:50 +03:00
Gleb Natapov af5b4f7ff7 KVM: x86 emulator: check return value against correct define
Check return value against correct define instead of open code
the value.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:48 +03:00
Gleb Natapov c73e197bc5 KVM: x86 emulator: fix RCX access during rep emulation
During rep emulation access length to RCX depends on current address
mode.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:47 +03:00
Gleb Natapov d6d367d678 KVM: x86 emulator: Fix DstAcc decoding.
Set correct operation length. Add RAX (64bit) handling.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:45 +03:00
Gleb Natapov 835e6b8047 KVM: x86 emulator mark VMMCALL and LMSW as privileged
LMSW is present in both group tables. It was marked privileged only in
one of them. Intel analog of VMMCALL is already marked privileged.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-05-17 12:15:18 +03:00
Gleb Natapov ea79849d4c KVM: x86 emulator: Implement jmp far opcode ff/5
Implement jmp far opcode ff/5. It is used by multiboot loader.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 13:53:45 +03:00
Gleb Natapov e35b7b9c9e KVM: x86 emulator: Add decoding of 16bit second in memory argument
Add decoding of Ep type of argument used by callf/jmpf.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 13:53:42 +03:00
Jan Kiszka 48005f64d0 KVM: x86: Save&restore interrupt shadow mask
The interrupt shadow created by STI or MOV-SS-like operations is part of
the VCPU state and must be preserved across migration. Transfer it in
the spare padding field of kvm_vcpu_events.interrupt.

As a side effect we now have to make vmx_set_interrupt_shadow robust
against both shadow types being set. Give MOV SS a higher priority and
skip STI in that case to avoid that VMX throws a fault on next entry.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 12:38:28 +03:00
Takuya Yoshikawa 0e4176a15f KVM: x86 emulator: Fix x86_emulate_insn() not to use the variable rc for non-X86EMUL values
This patch makes non-X86EMUL_* family functions not to use
the variable rc.

Be sure that this changes nothing but makes the purpose of
the variable rc clearer.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 12:27:50 +03:00
Takuya Yoshikawa 1b30eaa846 KVM: x86 emulator: X86EMUL macro replacements: x86_emulate_insn() and its helpers
This patch just replaces integer values used inside
x86_emulate_insn() and its helper functions to X86EMUL_*.

The purpose of this is to make it clear what will happen
when the variable rc is compared to X86EMUL_* at the end
of x86_emulate_insn().

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 12:27:46 +03:00
Takuya Yoshikawa 3e2815e9fa KVM: x86 emulator: X86EMUL macro replacements: from do_fetch_insn_byte() to x86_decode_insn()
This patch just replaces the integer values used inside x86's
decode functions to X86EMUL_*.

By this patch, it becomes clearer that we are using X86EMUL_*
value propagated from ops->read_std() in do_fetch_insn_byte().

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 12:27:43 +03:00
Gleb Natapov 1161624f15 KVM: inject #UD in 64bit mode from instruction that are not valid there
Some instruction are obsolete in a long mode. Inject #UD.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-04-25 12:27:40 +03:00
Takuya Yoshikawa e54cfa97a9 KVM: Fix emulate_sys[call, enter, exit]()'s fault handling
This patch fixes emulate_syscall(), emulate_sysenter() and
emulate_sysexit() to handle injected faults properly.

Even though original code injects faults in these functions,
we cannot handle these unless we use the different return
value from the UNHANDLEABLE case. So this patch use X86EMUL_*
codes instead of -1 and 0 and makes x86_emulate_insn() to
handle these propagated faults.

Be sure that, in x86_emulate_insn(), goto cannot_emulate and
goto done with rc equals X86EMUL_UNHANDLEABLE have same effect.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:14 -03:00
Gleb Natapov c697518a86 KVM: Fix segment descriptor loading
Add proper error and permission checking. This patch also change task
switching code to load segment selectors before segment descriptors, like
SDM requires, otherwise permission checking during segment descriptor
loading will be incorrect.

Cc: stable@kernel.org (2.6.33, 2.6.32)
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:14 -03:00
Gleb Natapov 8b9f44140b KVM: x86 emulator: Forbid modifying CS segment register by mov instruction
Inject #UD if guest attempts to do so. This is in accordance to Intel
SDM.

Cc: stable@kernel.org (2.6.33, 2.6.32)
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:13 -03:00
Gleb Natapov e424e19183 KVM: x86 emulator: disallow opcode 82 in 64-bit mode
Instructions with opcode 82 are not valid in 64 bit mode.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:12 -03:00
Wei Yongjun 1d327eac3c KVM: x86 emulator: code style cleanup
Just remove redundant semicolon.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:12 -03:00
Gleb Natapov d380a5e402 KVM: x86 emulator: Add LOCK prefix validity checking
Instructions which are not allowed to have LOCK prefix should
generate #UD if one is used.

[avi: fold opcode 82 fix from another patch]

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov e92805ac12 KVM: x86 emulator: Check CPL level during privilege instruction emulation
Add CPL checking in case emulator is tricked into emulating
privilege instruction from userspace.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov d4c6a1549c KVM: x86 emulator: Fix popf emulation
POPF behaves differently depending on current CPU mode. Emulate correct
logic to prevent guest from changing flags that it can't change otherwise.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov f850e2e603 KVM: x86 emulator: Check IOPL level during io instruction emulation
Make emulator check that vcpu is allowed to execute IN, INS, OUT,
OUTS, CLI, STI.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov 1871c6020d KVM: x86 emulator: fix memory access during x86 emulation
Currently when x86 emulator needs to access memory, page walk is done with
broadest permission possible, so if emulated instruction was executed
by userspace process it can still access kernel memory. Fix that by
providing correct memory access to page walker during emulation.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov a004475567 KVM: x86 emulator: Add Virtual-8086 mode of emulation
For some instructions CPU behaves differently for real-mode and
virtual 8086. Let emulator know which mode cpu is in, so it will
not poke into vcpu state directly.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:11 -03:00
Gleb Natapov 60a29d4ea4 KVM: x86 emulator: Add group9 instruction decoding
Use groups mechanism to decode 0F C7 instructions.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:10 -03:00
Gleb Natapov 2db2c2eb62 KVM: x86 emulator: Add group8 instruction decoding
Use groups mechanism to decode 0F BA instructions.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:36:10 -03:00
Avi Kivity 836a1b3c34 KVM: Move cr0/cr4/efer related helpers to x86.h
They have more general scope than the mmu.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-03-01 12:36:04 -03:00
Avi Kivity 3eeb3288bc KVM: Add a helper for checking if the guest is in protected mode
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-03-01 12:36:04 -03:00
Takuya Yoshikawa b60d513c32 KVM: x86: Use macros for x86_emulate_ops to avoid future mistakes
The return values from x86_emulate_ops are defined
in kvm_emulate.h as macros X86EMUL_*.

But in emulate.c, we are comparing the return values
from these ops with 0 to check if they're X86EMUL_CONTINUE
or not: X86EMUL_CONTINUE is defined as 0 now.

To avoid possible mistakes in the future, this patch
substitutes "X86EMUL_CONTINUE" for "0" that are being
compared with the return values from x86_emulate_ops.

  We think that there are more places we should use these
  macros, but the meanings of rc values in x86_emulate_insn()
  were not so clear at a glance. If we use proper macros in
  this function, we would be able to follow the flow of each
  emulation more easily and, maybe, more securely.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-03-01 12:36:01 -03:00
Avi Kivity 4d4ec08745 KVM: Replace read accesses of vcpu->arch.cr0 by an accessor
Since we'd like to allow the guest to own a few bits of cr0 at times, we need
to know when we access those bits.

Signed-off-by: Avi Kivity <avi@redhat.com>
2010-03-01 12:35:50 -03:00
Avi Kivity eb3c79e64a KVM: x86 emulator: limit instructions to 15 bytes
While we are never normally passed an instruction that exceeds 15 bytes,
smp games can cause us to attempt to interpret one, which will cause
large latencies in non-preempt hosts.

Cc: stable@kernel.org
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:25 +02:00
Mohammed Gamal abcf14b560 KVM: x86 emulator: Add pusha and popa instructions
This adds pusha and popa instructions (opcodes 0x60-0x61), this enables booting
MINIX with invalid guest state emulation on.

[marcelo: remove unused variable]

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:09 +02:00
Mohammed Gamal 94677e61fd KVM: x86 emulator: Add missing decoder flags for 'or' instructions
Add missing decoder flags for or instructions (0xc-0xd).

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:09 +02:00
Avi Kivity 851ba6922a KVM: Don't pass kvm_run arguments
They're just copies of vcpu->run, which is readily accessible.

Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:06 +02:00
Mohammed Gamal d8769fedd4 KVM: x86 emulator: Introduce No64 decode option
Introduces a new decode option "No64", which is used for instructions that are
invalid in long mode.

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:05 +02:00
Mohammed Gamal 0934ac9d13 KVM: x86 emulator: Add 'push/pop sreg' instructions
[avi: avoid buffer overflow]

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-03 09:32:05 +02:00
Mohammed Gamal 7bdb588827 KVM: x86 emulator: Add adc and sbb missing decoder flags
Add missing decoder flags for adc and sbb instructions
(opcodes 0x14-0x15, 0x1c-0x1d)

Signed-off-by: Mohammed Gamal <m.gamal005@gmail.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10 10:46:51 +03:00
Avi Kivity 56e8231841 KVM: Rename x86_emulate.c to emulate.c
We're in arch/x86, what could we possibly be emulating?

Signed-off-by: Avi Kivity <avi@redhat.com>
2009-09-10 10:46:45 +03:00