2012-12-18 01:07:52 +08:00
|
|
|
/*
|
|
|
|
|
* Copyright (C) 2012,2013 - ARM Ltd
|
|
|
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
|
|
|
*
|
|
|
|
|
* This program is free software; you can redistribute it and/or modify
|
|
|
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
|
|
|
* published by the Free Software Foundation.
|
|
|
|
|
*
|
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
|
*
|
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include <linux/linkage.h>
|
|
|
|
|
|
|
|
|
|
#include <asm/assembler.h>
|
|
|
|
|
#include <asm/kvm_arm.h>
|
|
|
|
|
#include <asm/kvm_mmu.h>
|
2015-03-20 00:42:28 +08:00
|
|
|
#include <asm/pgtable-hwdef.h>
|
2016-04-28 00:47:01 +08:00
|
|
|
#include <asm/sysreg.h>
|
2017-04-04 02:37:40 +08:00
|
|
|
#include <asm/virt.h>
|
2012-12-18 01:07:52 +08:00
|
|
|
|
|
|
|
|
.text
|
|
|
|
|
.pushsection .hyp.idmap.text, "ax"
|
|
|
|
|
|
|
|
|
|
.align 11
|
|
|
|
|
|
|
|
|
|
ENTRY(__kvm_hyp_init)
|
|
|
|
|
ventry __invalid // Synchronous EL2t
|
|
|
|
|
ventry __invalid // IRQ EL2t
|
|
|
|
|
ventry __invalid // FIQ EL2t
|
|
|
|
|
ventry __invalid // Error EL2t
|
|
|
|
|
|
|
|
|
|
ventry __invalid // Synchronous EL2h
|
|
|
|
|
ventry __invalid // IRQ EL2h
|
|
|
|
|
ventry __invalid // FIQ EL2h
|
|
|
|
|
ventry __invalid // Error EL2h
|
|
|
|
|
|
|
|
|
|
ventry __do_hyp_init // Synchronous 64-bit EL1
|
|
|
|
|
ventry __invalid // IRQ 64-bit EL1
|
|
|
|
|
ventry __invalid // FIQ 64-bit EL1
|
|
|
|
|
ventry __invalid // Error 64-bit EL1
|
|
|
|
|
|
|
|
|
|
ventry __invalid // Synchronous 32-bit EL1
|
|
|
|
|
ventry __invalid // IRQ 32-bit EL1
|
|
|
|
|
ventry __invalid // FIQ 32-bit EL1
|
|
|
|
|
ventry __invalid // Error 32-bit EL1
|
|
|
|
|
|
|
|
|
|
__invalid:
|
|
|
|
|
b .
|
|
|
|
|
|
|
|
|
|
/*
|
2016-07-01 01:40:44 +08:00
|
|
|
* x0: HYP pgd
|
|
|
|
|
* x1: HYP stack
|
|
|
|
|
* x2: HYP vectors
|
2012-12-18 01:07:52 +08:00
|
|
|
*/
|
|
|
|
|
__do_hyp_init:
|
2017-04-04 02:37:40 +08:00
|
|
|
/* Check for a stub HVC call */
|
|
|
|
|
cmp x0, #HVC_STUB_HCALL_NR
|
|
|
|
|
b.lo __kvm_handle_stub_hvc
|
2012-12-18 01:07:52 +08:00
|
|
|
|
|
|
|
|
msr ttbr0_el2, x0
|
|
|
|
|
|
|
|
|
|
mrs x4, tcr_el1
|
|
|
|
|
ldr x5, =TCR_EL2_MASK
|
|
|
|
|
and x4, x4, x5
|
2016-02-11 02:46:53 +08:00
|
|
|
mov x5, #TCR_EL2_RES1
|
2012-12-18 01:07:52 +08:00
|
|
|
orr x4, x4, x5
|
2015-03-20 00:42:28 +08:00
|
|
|
|
|
|
|
|
#ifndef CONFIG_ARM64_VA_BITS_48
|
|
|
|
|
/*
|
|
|
|
|
* If we are running with VA_BITS < 48, we may be running with an extra
|
|
|
|
|
* level of translation in the ID map. This is only the case if system
|
|
|
|
|
* RAM is out of range for the currently configured page size and number
|
|
|
|
|
* of translation levels, in which case we will also need the extra
|
|
|
|
|
* level for the HYP ID map, or we won't be able to enable the EL2 MMU.
|
|
|
|
|
*
|
|
|
|
|
* However, at EL2, there is only one TTBR register, and we can't switch
|
|
|
|
|
* between translation tables *and* update TCR_EL2.T0SZ at the same
|
|
|
|
|
* time. Bottom line: we need the extra level in *both* our translation
|
|
|
|
|
* tables.
|
|
|
|
|
*
|
|
|
|
|
* So use the same T0SZ value we use for the ID map.
|
|
|
|
|
*/
|
|
|
|
|
ldr_l x5, idmap_t0sz
|
|
|
|
|
bfi x4, x5, TCR_T0SZ_OFFSET, TCR_TxSZ_WIDTH
|
|
|
|
|
#endif
|
2014-03-07 16:49:25 +08:00
|
|
|
/*
|
|
|
|
|
* Read the PARange bits from ID_AA64MMFR0_EL1 and set the PS bits in
|
2015-01-29 21:19:45 +08:00
|
|
|
* TCR_EL2.
|
2014-03-07 16:49:25 +08:00
|
|
|
*/
|
|
|
|
|
mrs x5, ID_AA64MMFR0_EL1
|
|
|
|
|
bfi x4, x5, #16, #3
|
2016-02-11 02:46:53 +08:00
|
|
|
|
|
|
|
|
msr tcr_el2, x4
|
|
|
|
|
|
2012-12-18 01:07:52 +08:00
|
|
|
mrs x4, mair_el1
|
|
|
|
|
msr mair_el2, x4
|
|
|
|
|
isb
|
|
|
|
|
|
2014-07-31 14:53:23 +08:00
|
|
|
/* Invalidate the stale TLBs from Bootloader */
|
|
|
|
|
tlbi alle2
|
|
|
|
|
dsb sy
|
|
|
|
|
|
2013-11-06 02:29:45 +08:00
|
|
|
mrs x4, sctlr_el2
|
2016-04-28 00:47:01 +08:00
|
|
|
and x4, x4, #SCTLR_ELx_EE // preserve endianness of EL2
|
|
|
|
|
ldr x5, =SCTLR_ELx_FLAGS
|
2013-11-06 02:29:45 +08:00
|
|
|
orr x4, x4, x5
|
2012-12-18 01:07:52 +08:00
|
|
|
msr sctlr_el2, x4
|
|
|
|
|
isb
|
|
|
|
|
|
|
|
|
|
/* Set the stack and new vectors */
|
2016-07-01 01:40:44 +08:00
|
|
|
kern_hyp_va x1
|
|
|
|
|
mov sp, x1
|
2012-12-18 01:07:52 +08:00
|
|
|
kern_hyp_va x2
|
2016-07-01 01:40:44 +08:00
|
|
|
msr vbar_el2, x2
|
2012-12-18 01:07:52 +08:00
|
|
|
|
|
|
|
|
/* Hello, World! */
|
|
|
|
|
eret
|
|
|
|
|
ENDPROC(__kvm_hyp_init)
|
|
|
|
|
|
2017-04-04 02:37:40 +08:00
|
|
|
ENTRY(__kvm_handle_stub_hvc)
|
2017-04-04 02:37:41 +08:00
|
|
|
cmp x0, #HVC_GET_VECTORS
|
|
|
|
|
b.ne 1f
|
|
|
|
|
mrs x0, vbar_el2
|
|
|
|
|
b exit
|
|
|
|
|
|
|
|
|
|
1: cmp x0, #HVC_RESET_VECTORS
|
2017-04-04 02:37:40 +08:00
|
|
|
b.ne 1f
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
/*
|
2016-07-01 01:40:44 +08:00
|
|
|
* Reset kvm back to the hyp stub.
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
*/
|
|
|
|
|
/* We're now in idmap, disable MMU */
|
2016-07-01 01:40:44 +08:00
|
|
|
mrs x0, sctlr_el2
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
ldr x1, =SCTLR_ELx_FLAGS
|
|
|
|
|
bic x0, x0, x1 // Clear SCTL_M and etc
|
|
|
|
|
msr sctlr_el2, x0
|
|
|
|
|
isb
|
|
|
|
|
|
|
|
|
|
/* Install stub vectors */
|
|
|
|
|
adr_l x0, __hyp_stub_vectors
|
|
|
|
|
msr vbar_el2, x0
|
2017-04-04 02:37:40 +08:00
|
|
|
b exit
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
|
2017-04-04 02:37:40 +08:00
|
|
|
1: /* Bad stub call */
|
|
|
|
|
ldr x0, =HVC_STUB_ERR
|
|
|
|
|
|
|
|
|
|
exit:
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
eret
|
2017-04-04 02:37:40 +08:00
|
|
|
ENDPROC(__kvm_handle_stub_hvc)
|
arm64: kvm: allows kvm cpu hotplug
The current kvm implementation on arm64 does cpu-specific initialization
at system boot, and has no way to gracefully shutdown a core in terms of
kvm. This prevents kexec from rebooting the system at EL2.
This patch adds a cpu tear-down function and also puts an existing cpu-init
code into a separate function, kvm_arch_hardware_disable() and
kvm_arch_hardware_enable() respectively.
We don't need the arm64 specific cpu hotplug hook any more.
Since this patch modifies common code between arm and arm64, one stub
definition, __cpu_reset_hyp_mode(), is added on arm side to avoid
compilation errors.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
[Rebase, added separate VHE init/exit path, changed resets use of
kvm_call_hyp() to the __version, en/disabled hardware in init_subsystems(),
added icache maintenance to __kvm_hyp_reset() and removed lr restore, removed
guest-enter after teardown handling]
Signed-off-by: James Morse <james.morse@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2016-04-28 00:47:05 +08:00
|
|
|
|
2012-12-18 01:07:52 +08:00
|
|
|
.ltorg
|
|
|
|
|
|
|
|
|
|
.popsection
|