KVM: Optimize kvm_read_cr[04]_bits()

'mask' is always a constant, so we can check whether it includes a bit that
might be owned by the guest very cheaply, and avoid the decache call.  Saves
a few hundred bytes of module text.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/arch/x86/kvm/kvm_cache_regs.h b/arch/x86/kvm/kvm_cache_regs.h
index 6b419a36cbd9..cff851cf5322 100644
--- a/arch/x86/kvm/kvm_cache_regs.h
+++ b/arch/x86/kvm/kvm_cache_regs.h
@@ -1,6 +1,11 @@
 #ifndef ASM_KVM_CACHE_REGS_H
 #define ASM_KVM_CACHE_REGS_H
 
+#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
+#define KVM_POSSIBLE_CR4_GUEST_BITS                               \
+        (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR  \
+         | X86_CR4_OSXMMEXCPT | X86_CR4_PGE)
+
 static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu,
                                               enum kvm_reg reg)
 {
@@ -40,7 +45,8 @@ static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
 
 static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
 {
-        if (mask & vcpu->arch.cr0_guest_owned_bits)
+        ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
+        if (tmask & vcpu->arch.cr0_guest_owned_bits)
                 kvm_x86_ops->decache_cr0_guest_bits(vcpu);
         return vcpu->arch.cr0 & mask;
 }
@@ -52,7 +58,8 @@ static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
 
 static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
 {
-        if (mask & vcpu->arch.cr4_guest_owned_bits)
+        ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
+        if (tmask & vcpu->arch.cr4_guest_owned_bits)
                 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
         return vcpu->arch.cr4 & mask;
 }