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| author | Brijesh Singh <brijesh.singh@amd.com> | 2017-08-17 18:36:57 +0200 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2017-08-18 14:37:49 +0200 |
| commit | 618232e2196a6db1ed66b5e1ec049e5c46480f49 (patch) | |
| tree | 709c8d0d99cb3bdcd29fcc70f5f01122c58ab686 /arch/x86/kvm/svm.c | |
| parent | e08d26f0712532c79b5ba6200862eaf2036f8df6 (diff) | |
| download | linux-618232e2196a6db1ed66b5e1ec049e5c46480f49.tar.bz2 | |
KVM: x86: Avoid guest page table walk when gpa_available is set
When a guest causes a page fault which requires emulation, the
vcpu->arch.gpa_available flag is set to indicate that cr2 contains a
valid GPA.
Currently, emulator_read_write_onepage() makes use of gpa_available flag
to avoid a guest page walk for a known MMIO regions. Lets not limit
the gpa_available optimization to just MMIO region. The patch extends
the check to avoid page walk whenever gpa_available flag is set.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
[Fix EPT=0 according to Wanpeng Li's fix, plus ensure VMX also uses the
new code. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[Moved "ret < 0" to the else brach, as per David's review. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 1fa9ee5660f4..a603d0c14a5a 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -4236,8 +4236,6 @@ static int handle_exit(struct kvm_vcpu *vcpu) trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM); - vcpu->arch.gpa_available = (exit_code == SVM_EXIT_NPF); - if (!is_cr_intercept(svm, INTERCEPT_CR0_WRITE)) vcpu->arch.cr0 = svm->vmcb->save.cr0; if (npt_enabled) |