diff options
| author | KarimAllah Ahmed <karahmed@amazon.de> | 2019-01-31 21:24:31 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-04-30 21:32:28 +0200 |
| commit | 2e408936b6de5a7540880ae40bc7ce43102053ba (patch) | |
| tree | 8539e77cf02cfc1c31fe5276025dd0b34fdf8691 /arch/x86/kvm | |
| parent | 191c8137a93989825f0e9f78a198367dde677216 (diff) | |
| download | linux-2e408936b6de5a7540880ae40bc7ce43102053ba.tar.bz2 | |
X86/nVMX: handle_vmon: Read 4 bytes from guest memory
Read the data directly from guest memory instead of the map->read->unmap
sequence. This also avoids using kvm_vcpu_gpa_to_page() and kmap() which
assumes that there is a "struct page" for guest memory.
Suggested-by: Jim Mattson <jmattson@google.com>
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx/nested.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c index b46136b099b8..9b1973cc1e75 100644 --- a/arch/x86/kvm/vmx/nested.c +++ b/arch/x86/kvm/vmx/nested.c @@ -4264,7 +4264,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu) { int ret; gpa_t vmptr; - struct page *page; + uint32_t revision; struct vcpu_vmx *vmx = to_vmx(vcpu); const u64 VMXON_NEEDED_FEATURES = FEATURE_CONTROL_LOCKED | FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX; @@ -4313,18 +4313,10 @@ static int handle_vmon(struct kvm_vcpu *vcpu) if (!PAGE_ALIGNED(vmptr) || (vmptr >> cpuid_maxphyaddr(vcpu))) return nested_vmx_failInvalid(vcpu); - page = kvm_vcpu_gpa_to_page(vcpu, vmptr); - if (is_error_page(page)) + if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) || + revision != VMCS12_REVISION) return nested_vmx_failInvalid(vcpu); - if (*(u32 *)kmap(page) != VMCS12_REVISION) { - kunmap(page); - kvm_release_page_clean(page); - return nested_vmx_failInvalid(vcpu); - } - kunmap(page); - kvm_release_page_clean(page); - vmx->nested.vmxon_ptr = vmptr; ret = enter_vmx_operation(vcpu); if (ret) |