KVM: x86: use positive error values for msr emulation that causes #GP

[linux-2.6-microblaze.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 397f599..a4c59be 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -255,24 +255,23 @@ static struct kmem_cache *x86_emulator_cache;
 
 /*
  * When called, it means the previous get/set msr reached an invalid msr.
- * Return 0 if we want to ignore/silent this failed msr access, or 1 if we want
- * to fail the caller.
+ * Return true if we want to ignore/silent this failed msr access.
  */
-static int kvm_msr_ignored_check(struct kvm_vcpu *vcpu, u32 msr,
-                                u64 data, bool write)
+static bool kvm_msr_ignored_check(struct kvm_vcpu *vcpu, u32 msr,
+                                 u64 data, bool write)
 {
        const char *op = write ? "wrmsr" : "rdmsr";
 
        if (ignore_msrs) {
                if (report_ignored_msrs)
-                       vcpu_unimpl(vcpu, "ignored %s: 0x%x data 0x%llx\n",
-                                   op, msr, data);
+                       kvm_pr_unimpl("ignored %s: 0x%x data 0x%llx\n",
+                                     op, msr, data);
                /* Mask the error */
-               return 0;
+               return true;
        } else {
-               vcpu_debug_ratelimited(vcpu, "unhandled %s: 0x%x data 0x%llx\n",
-                                      op, msr, data);
-               return -ENOENT;
+               kvm_debug_ratelimited("unhandled %s: 0x%x data 0x%llx\n",
+                                     op, msr, data);
+               return false;
        }
 }
 
@@ -1416,7 +1415,8 @@ static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
        if (r == KVM_MSR_RET_INVALID) {
                /* Unconditionally clear the output for simplicity */
                *data = 0;
-               r = kvm_msr_ignored_check(vcpu, index, 0, false);
+               if (kvm_msr_ignored_check(vcpu, index, 0, false))
+                       r = 0;
        }
 
        if (r)
@@ -1540,7 +1540,7 @@ static int __kvm_set_msr(struct kvm_vcpu *vcpu, u32 index, u64 data,
        struct msr_data msr;
 
        if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_WRITE))
-               return -EPERM;
+               return KVM_MSR_RET_FILTERED;
 
        switch (index) {
        case MSR_FS_BASE:
@@ -1581,7 +1581,8 @@ static int kvm_set_msr_ignored_check(struct kvm_vcpu *vcpu,
        int ret = __kvm_set_msr(vcpu, index, data, host_initiated);
 
        if (ret == KVM_MSR_RET_INVALID)
-               ret = kvm_msr_ignored_check(vcpu, index, data, true);
+               if (kvm_msr_ignored_check(vcpu, index, data, true))
+                       ret = 0;
 
        return ret;
 }
@@ -1599,7 +1600,7 @@ int __kvm_get_msr(struct kvm_vcpu *vcpu, u32 index, u64 *data,
        int ret;
 
        if (!host_initiated && !kvm_msr_allowed(vcpu, index, KVM_MSR_FILTER_READ))
-               return -EPERM;
+               return KVM_MSR_RET_FILTERED;
 
        msr.index = index;
        msr.host_initiated = host_initiated;
@@ -1618,7 +1619,8 @@ static int kvm_get_msr_ignored_check(struct kvm_vcpu *vcpu,
        if (ret == KVM_MSR_RET_INVALID) {
                /* Unconditionally clear *data for simplicity */
                *data = 0;
-               ret = kvm_msr_ignored_check(vcpu, index, 0, false);
+               if (kvm_msr_ignored_check(vcpu, index, 0, false))
+                       ret = 0;
        }
 
        return ret;
@@ -1662,9 +1664,9 @@ static int complete_emulated_wrmsr(struct kvm_vcpu *vcpu)
 static u64 kvm_msr_reason(int r)
 {
        switch (r) {
-       case -ENOENT:
+       case KVM_MSR_RET_INVALID:
                return KVM_MSR_EXIT_REASON_UNKNOWN;
-       case -EPERM:
+       case KVM_MSR_RET_FILTERED:
                return KVM_MSR_EXIT_REASON_FILTER;
        default:
                return KVM_MSR_EXIT_REASON_INVAL;