KVM: VMX: Replace MSR_IA32_RTIT_OUTPUT_BASE_MASK with helper function

Replace the subtly not-a-constant MSR_IA32_RTIT_OUTPUT_BASE_MASK with a
proper helper function to check whether or not the specified base is
valid.  Blindly referencing the local 'vcpu' is especially nasty.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200924194250.19137-4-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 84dea73..2b5e749 100644 (file)
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -146,9 +146,6 @@ module_param_named(preemption_timer, enable_preemption_timer, bool, S_IRUGO);
        RTIT_STATUS_ERROR | RTIT_STATUS_STOPPED | \
        RTIT_STATUS_BYTECNT))
 
-#define MSR_IA32_RTIT_OUTPUT_BASE_MASK \
-       (~((1UL << cpuid_maxphyaddr(vcpu)) - 1) | 0x7f)
-
 /*
  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
  * ple_gap:    upper bound on the amount of time between two successive
@@ -1037,6 +1034,12 @@ static inline bool pt_can_write_msr(struct vcpu_vmx *vmx)
               !(vmx->pt_desc.guest.ctl & RTIT_CTL_TRACEEN);
 }
 
+static inline bool pt_output_base_valid(struct kvm_vcpu *vcpu, u64 base)
+{
+       /* The base must be 128-byte aligned and a legal physical address. */
+       return !(base & (~((1UL << cpuid_maxphyaddr(vcpu)) - 1) | 0x7f));
+}
+
 static inline void pt_load_msr(struct pt_ctx *ctx, u32 addr_range)
 {
        u32 i;
@@ -2172,7 +2175,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                    !intel_pt_validate_cap(vmx->pt_desc.caps,
                                           PT_CAP_single_range_output))
                        return 1;
-               if (data & MSR_IA32_RTIT_OUTPUT_BASE_MASK)
+               if (!pt_output_base_valid(vcpu, data))
                        return 1;
                vmx->pt_desc.guest.output_base = data;
                break;