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Diffstat (limited to 'arch/x86/kvm/vmx/nested.c')
-rw-r--r--arch/x86/kvm/vmx/nested.c24
1 files changed, 15 insertions, 9 deletions
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index ccb03d69546c..eedcebf58004 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2583,8 +2583,13 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
* Guest state is invalid and unrestricted guest is disabled,
* which means L1 attempted VMEntry to L2 with invalid state.
* Fail the VMEntry.
+ *
+ * However when force loading the guest state (SMM exit or
+ * loading nested state after migration, it is possible to
+ * have invalid guest state now, which will be later fixed by
+ * restoring L2 register state
*/
- if (CC(!vmx_guest_state_valid(vcpu))) {
+ if (CC(from_vmentry && !vmx_guest_state_valid(vcpu))) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
return -EINVAL;
}
@@ -4351,6 +4356,8 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
if (nested_vmx_load_msr(vcpu, vmcs12->vm_exit_msr_load_addr,
vmcs12->vm_exit_msr_load_count))
nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL);
+
+ to_vmx(vcpu)->emulation_required = vmx_emulation_required(vcpu);
}
static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx)
@@ -4899,14 +4906,7 @@ out_vmcs02:
return -ENOMEM;
}
-/*
- * Emulate the VMXON instruction.
- * Currently, we just remember that VMX is active, and do not save or even
- * inspect the argument to VMXON (the so-called "VMXON pointer") because we
- * do not currently need to store anything in that guest-allocated memory
- * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
- * argument is different from the VMXON pointer (which the spec says they do).
- */
+/* Emulate the VMXON instruction. */
static int handle_vmon(struct kvm_vcpu *vcpu)
{
int ret;
@@ -5903,6 +5903,12 @@ static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu,
case EXIT_REASON_VMFUNC:
/* VM functions are emulated through L2->L0 vmexits. */
return true;
+ case EXIT_REASON_BUS_LOCK:
+ /*
+ * At present, bus lock VM exit is never exposed to L1.
+ * Handle L2's bus locks in L0 directly.
+ */
+ return true;
default:
break;
}