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authorAvi Kivity <avi@qumranet.com>2007-01-31 23:48:13 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-01 16:22:41 -0800
commit432bd6cbf9f016f5480153b1cdfbd046f8d4fb1e (patch)
tree0398665da71dc09ec7d9f97f627d20e9ba06d658
parent6a4c24ec52128c1f57b7d2d24cf4dd13fc23f474 (diff)
downloadlinux-sh-432bd6cbf9f016f5480153b1cdfbd046f8d4fb1e.tar.gz
[PATCH] KVM: fix lockup on 32-bit intel hosts with nx disabled in the bios
Intel hosts, without long mode, and with nx support disabled in the bios have an efer that is readable but not writable. This causes a lockup on switch to guest mode (even though it should exit with reason 34 according to the documentation). Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/kvm/vmx.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index 27f2751c3baa..54c35c0b3181 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1116,6 +1116,8 @@ static int vmx_vcpu_setup(struct kvm_vcpu *vcpu)
if (rdmsr_safe(index, &data_low, &data_high) < 0)
continue;
+ if (wrmsr_safe(index, data_low, data_high) < 0)
+ continue;
data = data_low | ((u64)data_high << 32);
vcpu->host_msrs[j].index = index;
vcpu->host_msrs[j].reserved = 0;