KVM: SVM: Intercept the 'invd' and 'wbinvd' instructions

'invd' can destroy host data, and 'wbinvd' allows the guest to induce
long (milliseconds) latencies.

Noted by Ben Serebrin.

Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/svm.c

@@ -494,6 +494,7 @@ static void init_vmcb(struct vmcb *vmcb)
 		 */
 		/*              (1ULL << INTERCEPT_SELECTIVE_CR0) | */
 				(1ULL << INTERCEPT_CPUID) |
+				(1ULL << INTERCEPT_INVD) |
 				(1ULL << INTERCEPT_HLT) |
 				(1ULL << INTERCEPT_INVLPGA) |
 				(1ULL << INTERCEPT_IOIO_PROT) |
@@ -507,6 +508,7 @@ static void init_vmcb(struct vmcb *vmcb)
 				(1ULL << INTERCEPT_STGI) |
 				(1ULL << INTERCEPT_CLGI) |
 				(1ULL << INTERCEPT_SKINIT) |
+				(1ULL << INTERCEPT_WBINVD) |
 				(1ULL << INTERCEPT_MONITOR) |
 				(1ULL << INTERCEPT_MWAIT);
 
@@ -1247,6 +1249,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
 	[SVM_EXIT_VINTR]			= interrupt_window_interception,
 	/* [SVM_EXIT_CR0_SEL_WRITE]		= emulate_on_interception, */
 	[SVM_EXIT_CPUID]			= cpuid_interception,
+	[SVM_EXIT_INVD]                         = emulate_on_interception,
 	[SVM_EXIT_HLT]				= halt_interception,
 	[SVM_EXIT_INVLPG]			= emulate_on_interception,
 	[SVM_EXIT_INVLPGA]			= invalid_op_interception,
@@ -1261,6 +1264,7 @@ static int (*svm_exit_handlers[])(struct vcpu_svm *svm,
 	[SVM_EXIT_STGI]				= invalid_op_interception,
 	[SVM_EXIT_CLGI]				= invalid_op_interception,
 	[SVM_EXIT_SKINIT]			= invalid_op_interception,
+	[SVM_EXIT_WBINVD]                       = emulate_on_interception,
 	[SVM_EXIT_MONITOR]			= invalid_op_interception,
 	[SVM_EXIT_MWAIT]			= invalid_op_interception,
 };