KVM: nVMX: remove unnecessary double caching of MAXPHYADDR

After speed-up of cpuid_maxphyaddr() it can be called frequently:
instead of heavyweight enumeration of CPUID entries it returns a cached
pre-computed value. It is also inlined now. So caching its result became
unnecessary and can be removed.

Signed-off-by: Eugene Korenevsky <ekorenevsky@gmail.com>
Message-Id: <20150329205644.GA1258@gnote>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 6f770e8..ddce07e 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8866,9 +8866,9 @@ static int nested_vmx_check_apicv_controls(struct kvm_vcpu *vcpu,
 
 static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
                                       unsigned long count_field,
-                                      unsigned long addr_field,
-                                      int maxphyaddr)
+                                      unsigned long addr_field)
 {
+       int maxphyaddr;
        u64 count, addr;
 
        if (vmcs12_read_any(vcpu, count_field, &count) ||
@@ -8878,6 +8878,7 @@ static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
        }
        if (count == 0)
                return 0;
+       maxphyaddr = cpuid_maxphyaddr(vcpu);
        if (!IS_ALIGNED(addr, 16) || addr >> maxphyaddr ||
            (addr + count * sizeof(struct vmx_msr_entry) - 1) >> maxphyaddr) {
                pr_warn_ratelimited(
@@ -8891,19 +8892,16 @@ static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
 static int nested_vmx_check_msr_switch_controls(struct kvm_vcpu *vcpu,
                                                struct vmcs12 *vmcs12)
 {
-       int maxphyaddr;
-
        if (vmcs12->vm_exit_msr_load_count == 0 &&
            vmcs12->vm_exit_msr_store_count == 0 &&
            vmcs12->vm_entry_msr_load_count == 0)
                return 0; /* Fast path */
-       maxphyaddr = cpuid_maxphyaddr(vcpu);
        if (nested_vmx_check_msr_switch(vcpu, VM_EXIT_MSR_LOAD_COUNT,
-                                       VM_EXIT_MSR_LOAD_ADDR, maxphyaddr) ||
+                                       VM_EXIT_MSR_LOAD_ADDR) ||
            nested_vmx_check_msr_switch(vcpu, VM_EXIT_MSR_STORE_COUNT,
-                                       VM_EXIT_MSR_STORE_ADDR, maxphyaddr) ||
+                                       VM_EXIT_MSR_STORE_ADDR) ||
            nested_vmx_check_msr_switch(vcpu, VM_ENTRY_MSR_LOAD_COUNT,
-                                       VM_ENTRY_MSR_LOAD_ADDR, maxphyaddr))
+                                       VM_ENTRY_MSR_LOAD_ADDR))
                return -EINVAL;
        return 0;
 }