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authorAbel Gordon2013-04-18 14:39:55 +0300
committerGleb Natapov2013-04-22 10:52:55 +0300
commit8a1b9dd0006bce5cc770fd80bc95f9916670c151 (patch)
treef0faef1346c67ca8d156912613082fd1938aec50
parent012f83cb2f8d7b9b7ad3b65e7e53a9365a357014 (diff)
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: Abel Gordon <abelg@il.ibm.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
-rw-r--r--arch/x86/kvm/vmx.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c5baecc37c98..6abce2d5d18e 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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 */
copy_shadow_to_vmcs12(vmx);
vmx->nested.sync_shadow_vmcs = false;
+ exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
+ exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
+ vmcs_write64(VMCS_LINK_POINTER, -1ull);
}
}
kunmap(vmx->nested.current_vmcs12_page);
@@ -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);
+ exec_control |= SECONDARY_EXEC_SHADOW_VMCS;
+ vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
+ vmcs_write64(VMCS_LINK_POINTER,
+ __pa(vmx->nested.current_shadow_vmcs));
vmx->nested.sync_shadow_vmcs = true;
}
}