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KVM: vmx: Introduce handle_unexpected_vmexit and handle WAITPKG vmexit 

As the latest Intel 64 and IA-32 Architectures Software Developer's
Manual, UMWAIT and TPAUSE instructions cause a VM exit if the
RDTSC exiting and enable user wait and pause VM-execution
controls are both 1.

Because KVM never enable RDTSC exiting, the vm-exit for UMWAIT and TPAUSE
should never happen. Considering EXIT_REASON_XSAVES and
EXIT_REASON_XRSTORS is also unexpected VM-exit for KVM. Introduce a common
exit helper handle_unexpected_vmexit() to handle these unexpected VM-exit.

Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Co-developed-by: Jingqi Liu <jingqi.liu@intel.com>
Signed-off-by: Jingqi Liu <jingqi.liu@intel.com>
Signed-off-by: Tao Xu <tao3.xu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Tao Xu 2019-07-16 14:55:51 +08:00 committed by Paolo Bonzini
parent 6e3ba4abce
commit bf653b78f9
3 changed files with 21 additions and 17 deletions
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6
arch/x86/include/uapi/asm/vmx.h
View File

@ -86,6 +86,8 @@
#define EXIT_REASON_PML_FULL 62
#define EXIT_REASON_XSAVES 63
#define EXIT_REASON_XRSTORS 64
#define EXIT_REASON_UMWAIT 67
#define EXIT_REASON_TPAUSE 68
#define VMX_EXIT_REASONS \
{ EXIT_REASON_EXCEPTION_NMI, "EXCEPTION_NMI" }, \
@ -144,7 +146,9 @@
{ EXIT_REASON_RDSEED, "RDSEED" }, \
{ EXIT_REASON_PML_FULL, "PML_FULL" }, \
{ EXIT_REASON_XSAVES, "XSAVES" }, \
{ EXIT_REASON_XRSTORS, "XRSTORS" }
{ EXIT_REASON_XRSTORS, "XRSTORS" }, \
{ EXIT_REASON_UMWAIT, "UMWAIT" }, \
{ EXIT_REASON_TPAUSE, "TPAUSE" }
#define VMX_ABORT_SAVE_GUEST_MSR_FAIL 1
#define VMX_ABORT_LOAD_HOST_PDPTE_FAIL 2

4
arch/x86/kvm/vmx/nested.c
View File

@ -5470,6 +5470,10 @@ bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason)
case EXIT_REASON_ENCLS:
/* SGX is never exposed to L1 */
return false;
case EXIT_REASON_UMWAIT:
case EXIT_REASON_TPAUSE:
return nested_cpu_has2(vmcs12,
SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE);
default:
return true;
}

28
arch/x86/kvm/vmx/vmx.c
View File

@ -5007,20 +5007,6 @@ static int handle_xsetbv(struct kvm_vcpu *vcpu)
return 1;
}
static int handle_xsaves(struct kvm_vcpu *vcpu)
{
kvm_skip_emulated_instruction(vcpu);
WARN(1, "this should never happen\n");
return 1;
}
static int handle_xrstors(struct kvm_vcpu *vcpu)
{
kvm_skip_emulated_instruction(vcpu);
WARN(1, "this should never happen\n");
return 1;
}
static int handle_apic_access(struct kvm_vcpu *vcpu)
{
if (likely(fasteoi)) {
@ -5514,6 +5500,14 @@ static int handle_encls(struct kvm_vcpu *vcpu)
return 1;
}
static int handle_unexpected_vmexit(struct kvm_vcpu *vcpu)
{
kvm_skip_emulated_instruction(vcpu);
WARN_ONCE(1, "Unexpected VM-Exit Reason = 0x%x",
vmcs_read32(VM_EXIT_REASON));
return 1;
}
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
@ -5565,13 +5559,15 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_INVVPID] = handle_vmx_instruction,
[EXIT_REASON_RDRAND] = handle_invalid_op,
[EXIT_REASON_RDSEED] = handle_invalid_op,
[EXIT_REASON_XSAVES] = handle_xsaves,
[EXIT_REASON_XRSTORS] = handle_xrstors,
[EXIT_REASON_XSAVES] = handle_unexpected_vmexit,
[EXIT_REASON_XRSTORS] = handle_unexpected_vmexit,
[EXIT_REASON_PML_FULL] = handle_pml_full,
[EXIT_REASON_INVPCID] = handle_invpcid,
[EXIT_REASON_VMFUNC] = handle_vmx_instruction,
[EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer,
[EXIT_REASON_ENCLS] = handle_encls,
[EXIT_REASON_UMWAIT] = handle_unexpected_vmexit,
[EXIT_REASON_TPAUSE] = handle_unexpected_vmexit,
};
static const int kvm_vmx_max_exit_handlers =