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| author | Sean Christopherson <seanjc@google.com> | 2021-04-24 01:34:04 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-26 12:26:13 +0300 |
| commit | 844d69c26d836fde97bf6f38a0a69da9fa42e985 (patch) | |
| tree | e4244ad1b8062b3d21afd2337582a3618f54ac3b /arch/x86/kvm/svm/svm.h | |
| parent | dbd6127375aacaa1e034e77537aa7373223e276c (diff) | |
| download | linux-844d69c26d836fde97bf6f38a0a69da9fa42e985.tar.xz | |
KVM: SVM: Delay restoration of host MSR_TSC_AUX until return to userspace
Use KVM's "user return MSRs" framework to defer restoring the host's
MSR_TSC_AUX until the CPU returns to userspace. Add/improve comments to
clarify why MSR_TSC_AUX is intercepted on both RDMSR and WRMSR, and why
it's safe for KVM to keep the guest's value loaded even if KVM is
scheduled out.
Cc: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210423223404.3860547-5-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.h')
| -rw-r--r-- | arch/x86/kvm/svm/svm.h | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index d6206196eec1..5d8027e9c1c5 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -23,11 +23,6 @@ #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT) -static const u32 host_save_user_msrs[] = { - MSR_TSC_AUX, -}; -#define NR_HOST_SAVE_USER_MSRS ARRAY_SIZE(host_save_user_msrs) - #define IOPM_SIZE PAGE_SIZE * 3 #define MSRPM_SIZE PAGE_SIZE * 2 @@ -129,8 +124,6 @@ struct vcpu_svm { u64 next_rip; - u64 host_user_msrs[NR_HOST_SAVE_USER_MSRS]; - u64 spec_ctrl; /* * Contains guest-controlled bits of VIRT_SPEC_CTRL, which will be |