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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-12-10 11:10:01 -0600 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-12-15 05:20:56 -0500 |
| commit | ed02b213098a90c2a415a0da18f05841f8cf0a81 (patch) | |
| tree | 0983564841eec20f81b6484f1a488cce58e37db5 /arch/x86/kvm/svm | |
| parent | 5719455fbd952a69ebc860d47bb0287e9198fe12 (diff) | |
| download | linux-ed02b213098a90c2a415a0da18f05841f8cf0a81.tar.bz2 | |
KVM: SVM: Guest FPU state save/restore not needed for SEV-ES guest
The guest FPU state is automatically restored on VMRUN and saved on VMEXIT
by the hardware, so there is no reason to do this in KVM. Eliminate the
allocation of the guest_fpu save area and key off that to skip operations
related to the guest FPU state.
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <173e429b4d0d962c6a443c4553ffdaf31b7665a4.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 6064a6035dbb..f1c32cdc9d49 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1317,6 +1317,14 @@ static int svm_create_vcpu(struct kvm_vcpu *vcpu) vmsa_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO); if (!vmsa_page) goto error_free_vmcb_page; + + /* + * SEV-ES guests maintain an encrypted version of their FPU + * state which is restored and saved on VMRUN and VMEXIT. + * Free the fpu structure to prevent KVM from attempting to + * access the FPU state. + */ + kvm_free_guest_fpu(vcpu); } err = avic_init_vcpu(svm); |