[PATCH] KVM: Emulate IA32_MISC_ENABLE msr

This allows netbsd 3.1 i386 to get further along installing.

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>

2 files changed, 17 insertions, 1 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index 91e0c75aca8..2db1ca4c680 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -242,6 +242,7 @@ struct kvm_vcpu {
         u64 pdptrs[4]; /* pae */
         u64 shadow_efer;
         u64 apic_base;
+        u64 ia32_misc_enable_msr;
         int nmsrs;
         struct vmx_msr_entry *guest_msrs;
         struct vmx_msr_entry *host_msrs;
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index be4651abe72..b10972ed0c9 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -1226,6 +1226,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
         case MSR_IA32_APICBASE:
                 data = vcpu->apic_base;
                 break;
+        case MSR_IA32_MISC_ENABLE:
+                data = vcpu->ia32_misc_enable_msr;
+                break;
 #ifdef CONFIG_X86_64
         case MSR_EFER:
                 data = vcpu->shadow_efer;
@@ -1297,6 +1300,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
         case MSR_IA32_APICBASE:
                 vcpu->apic_base = data;
                 break;
+        case MSR_IA32_MISC_ENABLE:
+                vcpu->ia32_misc_enable_msr = data;
+                break;
         default:
                 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
                 return 1;
@@ -1600,6 +1606,10 @@ static u32 msrs_to_save[] = {
 
 static unsigned num_msrs_to_save;
 
+static u32 emulated_msrs[] = {
+        MSR_IA32_MISC_ENABLE,
+};
+
 static __init void kvm_init_msr_list(void)
 {
         u32 dummy[2];
@@ -1925,7 +1935,7 @@ static long kvm_dev_ioctl(struct file *filp,
                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
                         goto out;
                 n = msr_list.nmsrs;
-                msr_list.nmsrs = num_msrs_to_save;
+                msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
                         goto out;
                 r = -E2BIG;
@@ -1935,6 +1945,11 @@ static long kvm_dev_ioctl(struct file *filp,
                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
                                  num_msrs_to_save * sizeof(u32)))
                         goto out;
+                if (copy_to_user(user_msr_list->indices
+                                 + num_msrs_to_save * sizeof(u32),
+                                 &emulated_msrs,
+                                 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
+                        goto out;
                 r = 0;
                 break;
         }