diff options
| author | Abel Gordon <abelg@il.ibm.com> | 2013-04-18 14:39:55 +0300 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-04-22 10:52:55 +0300 |
| commit | 8a1b9dd0006bce5cc770fd80bc95f9916670c151 (patch) | |
| tree | f0faef1346c67ca8d156912613082fd1938aec50 /arch/x86 | |
| parent | 012f83cb2f8d7b9b7ad3b65e7e53a9365a357014 (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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 11 |
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; } } |