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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2018-03-05 09:33:27 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-03-23 18:26:21 +0100 |
| commit | 9d1887ef3252a45f4e692525d04e23ce8091c17c (patch) | |
| tree | 82d2700fa857f56446dc28d5e9d0746818b25cd6 /arch/x86/kvm | |
| parent | e13c2ac512373d7b108ca534249b76e0da1e3334 (diff) | |
| download | linux-9d1887ef3252a45f4e692525d04e23ce8091c17c.tar.bz2 | |
KVM: nVMX: sync vmcs02 segment regs prior to vmx_set_cr0
Segment registers must be synchronized prior to any code that may
trigger a call to emulation_required()/guest_state_valid(), e.g.
vmx_set_cr0(). Because preparing vmcs02 writes segmentation fields
directly, i.e. doesn't use vmx_set_segment(), emulation_required
will not be re-evaluated when synchronizing the segment registers,
which can result in L0 incorrectly starting emulation of L2.
Fixes: 8665c3f97320 ("KVM: nVMX: initialize descriptor cache fields in prepare_vmcs02_full")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
[Move all of prepare_vmcs02_full earlier, not just segment registers. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 051dab74e4e9..f0fd50ba284c 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10704,6 +10704,11 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, struct vcpu_vmx *vmx = to_vmx(vcpu); u32 exec_control, vmcs12_exec_ctrl; + if (vmx->nested.dirty_vmcs12) { + prepare_vmcs02_full(vcpu, vmcs12, from_vmentry); + vmx->nested.dirty_vmcs12 = false; + } + /* * First, the fields that are shadowed. This must be kept in sync * with vmx_shadow_fields.h. @@ -10941,11 +10946,6 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */ vmx_set_efer(vcpu, vcpu->arch.efer); - if (vmx->nested.dirty_vmcs12) { - prepare_vmcs02_full(vcpu, vmcs12, from_vmentry); - vmx->nested.dirty_vmcs12 = false; - } - /* Shadow page tables on either EPT or shadow page tables. */ if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12), entry_failure_code)) |