From f7a711971edd952352a89698db1d36f469e25f77 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Sun, 11 Apr 2010 15:33:32 +0300 Subject: [PATCH] KVM: Fix MAXPHYADDR calculation when cpuid does not support it MAXPHYADDR is derived from cpuid 0x80000008, but when that isn't present, we get some random value. Fix by checking first that cpuid 0x80000008 is supported. Acked-by: Pekka Enberg Signed-off-by: Avi Kivity Signed-off-by: Marcelo Tosatti --- arch/x86/kvm/x86.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 33a40c544c7a..d65e481c5fa4 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4171,9 +4171,13 @@ int cpuid_maxphyaddr(struct kvm_vcpu *vcpu) { struct kvm_cpuid_entry2 *best; + best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0); + if (!best || best->eax < 0x80000008) + goto not_found; best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); if (best) return best->eax & 0xff; +not_found: return 36; } -- 2.39.5