KVM: x86: Make APIC_VERSION capture only the magic 0x14UL.

Refactor APIC_VERSION so that the maximum number of LVT entries is
inserted at runtime rather than compile time. This will be used in a
subsequent commit to expose the LVT CMCI Register to VMs that support
Corrected Machine Check error counting/signaling
(IA32_MCG_CAP.MCG_CMCI_P=1).

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Jue Wang <juew@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220610171134.772566-2-juew@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 43c42a5..828af02 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -54,7 +54,7 @@
 #define PRIo64 "o"
 
 /* 14 is the version for Xeon and Pentium 8.4.8*/
-#define APIC_VERSION                   (0x14UL | ((KVM_APIC_LVT_NUM - 1) << 16))
+#define APIC_VERSION                   0x14UL
 #define LAPIC_MMIO_LENGTH              (1 << 12)
 /* followed define is not in apicdef.h */
 #define MAX_APIC_VECTOR                        256
@@ -402,7 +402,7 @@ static inline int apic_lvt_nmi_mode(u32 lvt_val)
 void kvm_apic_set_version(struct kvm_vcpu *vcpu)
 {
        struct kvm_lapic *apic = vcpu->arch.apic;
-       u32 v = APIC_VERSION;
+       u32 v = APIC_VERSION | ((KVM_APIC_LVT_NUM - 1) << 16);
 
        if (!lapic_in_kernel(vcpu))
                return;