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Subject[PATCH v5 1/2] KVM: X86: Introduce kvm_get_msr_feature()
Date
From: Wanpeng Li <wanpengli@tencent.com>

Introduce kvm_get_msr_feature() to handle the msrs which are supported
by different vendors and sharing the same emulation logic.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Liran Alon <liran.alon@oracle.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/x86.c | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d4985a9..efc8554 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1062,13 +1062,25 @@ static u32 msr_based_features[] = {

static unsigned int num_msr_based_features;

+static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
+{
+ switch (msr->index) {
+ default:
+ if (kvm_x86_ops->get_msr_feature(msr))
+ return 1;
+ }
+ return 0;
+}
+
static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
{
struct kvm_msr_entry msr;
+ int r;

msr.index = index;
- if (kvm_x86_ops->get_msr_feature(&msr))
- return 1;
+ r = kvm_get_msr_feature(&msr);
+ if (r)
+ return r;

*data = msr.data;

@@ -4538,7 +4550,7 @@ static void kvm_init_msr_list(void)
struct kvm_msr_entry msr;

msr.index = msr_based_features[i];
- if (kvm_x86_ops->get_msr_feature(&msr))
+ if (kvm_get_msr_feature(&msr))
continue;

if (j < i)
--
2.7.4
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