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authorMarcelo Tosatti <mtosatti@redhat.com>2010-10-21 13:35:04 -0200
committerMarcelo Tosatti <mtosatti@redhat.com>2010-10-21 13:37:41 -0200
commit25d2e3613d159782b66f497184ebdcf3ccb686ab (patch)
tree676f83549253c2dd6bd2ab14c326a9aaa1c83da1 /target-i386
parent384331a61a8ca42f32516ced20cb52470c5f6f57 (diff)
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kvm: save/restore x86-64 MSRs on x86-64 kernels
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'target-i386')
-rw-r--r--target-i386/kvm.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index e2f7e2e..ae0a034 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -15,6 +15,7 @@
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
+#include <sys/utsname.h>
#include <linux/kvm.h>
@@ -53,6 +54,8 @@
#define BUS_MCEERR_AO 5
#endif
+static int lm_capable_kernel;
+
#ifdef KVM_CAP_EXT_CPUID
static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
@@ -523,6 +526,11 @@ int kvm_arch_init(KVMState *s, int smp_cpus)
{
int ret;
+ struct utsname utsname;
+
+ uname(&utsname);
+ lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
+
/* create vm86 tss. KVM uses vm86 mode to emulate 16-bit code
* directly. In order to use vm86 mode, a TSS is needed. Since this
* must be part of guest physical memory, we need to allocate it. Older
@@ -810,11 +818,12 @@ static int kvm_put_msrs(CPUState *env, int level)
if (kvm_has_msr_hsave_pa(env))
kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
#ifdef TARGET_X86_64
- /* FIXME if lm capable */
- kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
- kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
- kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
- kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
+ if (lm_capable_kernel) {
+ kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
+ kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
+ kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
+ kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
+ }
#endif
if (level == KVM_PUT_FULL_STATE) {
/*
@@ -1046,11 +1055,12 @@ static int kvm_get_msrs(CPUState *env)
msrs[n++].index = MSR_VM_HSAVE_PA;
msrs[n++].index = MSR_IA32_TSC;
#ifdef TARGET_X86_64
- /* FIXME lm_capable_kernel */
- msrs[n++].index = MSR_CSTAR;
- msrs[n++].index = MSR_KERNELGSBASE;
- msrs[n++].index = MSR_FMASK;
- msrs[n++].index = MSR_LSTAR;
+ if (lm_capable_kernel) {
+ msrs[n++].index = MSR_CSTAR;
+ msrs[n++].index = MSR_KERNELGSBASE;
+ msrs[n++].index = MSR_FMASK;
+ msrs[n++].index = MSR_LSTAR;
+ }
#endif
msrs[n++].index = MSR_KVM_SYSTEM_TIME;
msrs[n++].index = MSR_KVM_WALL_CLOCK;