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| author |  Sean Christopherson <seanjc@google.com>
| 2021-07-13 09:32:45 -0700 |
|---|---|---|
| committer |  Paolo Bonzini <pbonzini@redhat.com>
| 2021-08-02 11:01:50 -0400 |
| commit | 61152cd907d59ffd6b0a9479b2fa3b3b7b080409 (patch) | |
| tree | 8cbb13ab0a5ad32036912b6cb0cff39aee4e4f06 | |
| parent | KVM: SVM: Fall back to KVM's hardcoded value for EDX at RESET/INIT (diff) | |
| download | linux-61152cd907d59ffd6b0a9479b2fa3b3b7b080409.tar.gz linux-61152cd907d59ffd6b0a9479b2fa3b3b7b080409.tar.bz2 linux-61152cd907d59ffd6b0a9479b2fa3b3b7b080409.zip | |
KVM: VMX: Remove explicit MMU reset in enter_rmode()
Drop an explicit MMU reset when entering emulated real mode now that the
vCPU INIT/RESET path correctly handles conditional MMU resets, e.g. if
INIT arrives while the vCPU is in 64-bit mode.
Note, while there are multiple other direct calls to vmx_set_cr0(), i.e.
paths that change CR0 without invoking kvm_post_set_cr0(), only the INIT
emulation can reach enter_rmode(). CLTS emulation only toggles CR.TS,
VM-Exit (and late VM-Fail) emulation cannot architecturally transition to
Real Mode, and VM-Enter to Real Mode is possible if and only if
Unrestricted Guest is enabled (exposed to L1).
This effectively reverts commit 8668a3c468ed ("KVM: VMX: Reset mmu
context when entering real mode")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx/vmx.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 6946a5161d38..207393a429d1 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2852,8 +2852,6 @@ static void enter_rmode(struct kvm_vcpu *vcpu) fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.segs[VCPU_SREG_DS]); fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.segs[VCPU_SREG_GS]); fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.segs[VCPU_SREG_FS]); - - kvm_mmu_reset_context(vcpu); } int vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer) |