KVM: nVMX: WARN on failure to set IA32_PERF_GLOBAL_CTRL

Writes to MSR_CORE_PERF_GLOBAL_CONTROL should never fail if the VM-exit
and VM-entry controls are exposed to L1. Promote the checks to perform a
full WARN if kvm_set_msr() fails and remove the now unused macro
SET_MSR_OR_WARN().

Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Oliver Upton <oupton@google.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index ef2d538..2f2d499 100644 (file)
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -28,16 +28,6 @@ module_param(nested_early_check, bool, S_IRUGO);
        failed;                                                         \
 })
 
-#define SET_MSR_OR_WARN(vcpu, idx, data)                               \
-({                                                                     \
-       bool failed = kvm_set_msr(vcpu, idx, data);                     \
-       if (failed)                                                     \
-               pr_warn_ratelimited(                                    \
-                               "%s cannot write MSR (0x%x, 0x%llx)\n", \
-                               __func__, idx, data);                   \
-       failed;                                                         \
-})
-
 /*
  * Hyper-V requires all of these, so mark them as supported even though
  * they are just treated the same as all-context.
@@ -2550,8 +2540,8 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
                vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
 
        if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
-           SET_MSR_OR_WARN(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
-                           vmcs12->guest_ia32_perf_global_ctrl))
+           WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
+                                    vmcs12->guest_ia32_perf_global_ctrl)))
                return -EINVAL;
 
        kvm_rsp_write(vcpu, vmcs12->guest_rsp);
@@ -3996,8 +3986,8 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
                vcpu->arch.pat = vmcs12->host_ia32_pat;
        }
        if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
-               SET_MSR_OR_WARN(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
-                               vmcs12->host_ia32_perf_global_ctrl);
+               WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
+                                        vmcs12->host_ia32_perf_global_ctrl));
 
        /* Set L1 segment info according to Intel SDM
            27.5.2 Loading Host Segment and Descriptor-Table Registers */