KVM: x86: Rename local "ecx" variables to "msr" and "pmc" as appropriate

Rename "ecx" variables in {RD,WR}MSR and RDPMC helpers to "msr" and "pmc"
respectively, in anticipation of adding support for the immediate variants
of RDMSR and WRMSRNS, and to better document what the variables hold
(versus where the data originated).

No functional change intended.

Link: https://lore.kernel.org/r/20250805202224.1475590-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6e56d5cff44d4695cb4ffa05d8e4ddba88f53bf2..f7c5db3d26529c370cc1c00c4c340820834253ec 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1573,10 +1573,10 @@ EXPORT_SYMBOL_GPL(kvm_get_dr);
 
 int kvm_emulate_rdpmc(struct kvm_vcpu *vcpu)
 {
-       u32 ecx = kvm_rcx_read(vcpu);
+       u32 pmc = kvm_rcx_read(vcpu);
        u64 data;
 
-       if (kvm_pmu_rdpmc(vcpu, ecx, &data)) {
+       if (kvm_pmu_rdpmc(vcpu, pmc, &data)) {
                kvm_inject_gp(vcpu, 0);
                return 1;
        }
@@ -2027,23 +2027,23 @@ static int kvm_msr_user_space(struct kvm_vcpu *vcpu, u32 index,
 
 int kvm_emulate_rdmsr(struct kvm_vcpu *vcpu)
 {
-       u32 ecx = kvm_rcx_read(vcpu);
+       u32 msr = kvm_rcx_read(vcpu);
        u64 data;
        int r;
 
-       r = kvm_get_msr_with_filter(vcpu, ecx, &data);
+       r = kvm_get_msr_with_filter(vcpu, msr, &data);
 
        if (!r) {
-               trace_kvm_msr_read(ecx, data);
+               trace_kvm_msr_read(msr, data);
 
                kvm_rax_write(vcpu, data & -1u);
                kvm_rdx_write(vcpu, (data >> 32) & -1u);
        } else {
                /* MSR read failed? See if we should ask user space */
-               if (kvm_msr_user_space(vcpu, ecx, KVM_EXIT_X86_RDMSR, 0,
+               if (kvm_msr_user_space(vcpu, msr, KVM_EXIT_X86_RDMSR, 0,
                                       complete_fast_rdmsr, r))
                        return 0;
-               trace_kvm_msr_read_ex(ecx);
+               trace_kvm_msr_read_ex(msr);
        }
 
        return kvm_x86_call(complete_emulated_msr)(vcpu, r);
@@ -2052,23 +2052,23 @@ EXPORT_SYMBOL_GPL(kvm_emulate_rdmsr);
 
 int kvm_emulate_wrmsr(struct kvm_vcpu *vcpu)
 {
-       u32 ecx = kvm_rcx_read(vcpu);
+       u32 msr = kvm_rcx_read(vcpu);
        u64 data = kvm_read_edx_eax(vcpu);
        int r;
 
-       r = kvm_set_msr_with_filter(vcpu, ecx, data);
+       r = kvm_set_msr_with_filter(vcpu, msr, data);
 
        if (!r) {
-               trace_kvm_msr_write(ecx, data);
+               trace_kvm_msr_write(msr, data);
        } else {
                /* MSR write failed? See if we should ask user space */
-               if (kvm_msr_user_space(vcpu, ecx, KVM_EXIT_X86_WRMSR, data,
+               if (kvm_msr_user_space(vcpu, msr, KVM_EXIT_X86_WRMSR, data,
                                       complete_fast_msr_access, r))
                        return 0;
                /* Signal all other negative errors to userspace */
                if (r < 0)
                        return r;
-               trace_kvm_msr_write_ex(ecx, data);
+               trace_kvm_msr_write_ex(msr, data);
        }
 
        return kvm_x86_call(complete_emulated_msr)(vcpu, r);