Merge tag 'kvm-ppc-fixes-5.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into kvm-master

PPC KVM fix for 5.5

- Fix a bug where we try to do an ultracall on a system without an
  ultravisor.

1 files changed, 9 insertions, 1 deletions

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index bf715e5fd35c..cf55629ff0ff 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -505,7 +505,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
 
 	r = -E2BIG;
 
-	if (*nent >= maxnent)
+	if (WARN_ON(*nent >= maxnent))
 		goto out;
 
 	do_host_cpuid(entry, function, 0);
@@ -780,6 +780,11 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function,
 	case 0x8000001a:
 	case 0x8000001e:
 		break;
+	/* Support memory encryption cpuid if host supports it */
+	case 0x8000001F:
+		if (!boot_cpu_has(X86_FEATURE_SEV))
+			entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
+		break;
 	/*Add support for Centaur's CPUID instruction*/
 	case 0xC0000000:
 		/*Just support up to 0xC0000004 now*/
@@ -812,6 +817,9 @@ out:
 static int do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 func,
 			 int *nent, int maxnent, unsigned int type)
 {
+	if (*nent >= maxnent)
+		return -E2BIG;
+
 	if (type == KVM_GET_EMULATED_CPUID)
 		return __do_cpuid_func_emulated(entry, func, nent, maxnent);