kvm: reset MSR_IA32_CR_PAT correctly

The power-on value of MSR_IA32_CR_PAT is not 0 - that disables cacheing and
makes everything dog slow.

Fix to reset MSR_IA32_CR_PAT to the correct value.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/qemu-kvm-x86.c b/qemu-kvm-x86.c
index 4c32771e1..e02e89636 100644
--- a/qemu-kvm-x86.c
+++ b/qemu-kvm-x86.c
@@ -1289,12 +1289,21 @@ static int kvm_reset_msrs(CPUState *env)
     } msr_data;
     int n;
     struct kvm_msr_entry *msrs = msr_data.entries;
+    uint32_t index;
+    uint64_t data;
 
     if (!kvm_msr_list)
         return -1;
 
     for (n = 0; n < kvm_msr_list->nmsrs; n++) {
-        kvm_msr_entry_set(&msrs[n], kvm_msr_list->indices[n], 0);
+        index = kvm_msr_list->indices[n];
+        switch (index) {
+        case MSR_PAT:
+            data = 0x0007040600070406ULL;
+        default:
+            data = 0;
+        }
+        kvm_msr_entry_set(&msrs[n], index, data);
     }
 
     msr_data.info.nmsrs = n;