Commit 8a1b9dd0 authored by Abel Gordon's avatar Abel Gordon Committed by Gleb Natapov
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KVM: nVMX: Enable and disable shadow vmcs functionality

Once L1 loads VMCS12 we enable shadow-vmcs capability and copy all the VMCS12
shadowed fields to the shadow vmcs.  When we release the VMCS12, we also
disable shadow-vmcs capability.
Signed-off-by: default avatarAbel Gordon <>
Reviewed-by: default avatarOrit Wasserman <>
Signed-off-by: default avatarGleb Natapov <>
parent 012f83cb
......@@ -5616,12 +5616,17 @@ static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
static inline void nested_release_vmcs12(struct vcpu_vmx *vmx)
u32 exec_control;
if (enable_shadow_vmcs) {
if (vmx->nested.current_vmcs12 != NULL) {
/* copy to memory all shadowed fields in case
they were modified */
vmx->nested.sync_shadow_vmcs = false;
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmcs_write64(VMCS_LINK_POINTER, -1ull);
......@@ -6110,6 +6115,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
gva_t gva;
gpa_t vmptr;
struct x86_exception e;
u32 exec_control;
if (!nested_vmx_check_permission(vcpu))
return 1;
......@@ -6155,6 +6161,11 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
vmx->nested.current_vmcs12 = new_vmcs12;
vmx->nested.current_vmcs12_page = page;
if (enable_shadow_vmcs) {
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
vmx->nested.sync_shadow_vmcs = true;
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