KVM: nSVM: Use the "outer" helper for writing multiplier to MSR_AMD64_TSC_RATIO

When emulating nested SVM transitions, use the outer helper for writing
the TSC multiplier for L2.  Using the inner helper only for one-off cases,
i.e. for paths where KVM is NOT emulating or modifying vCPU state, will
allow for multiple cleanups:

 - Explicitly disabling preemption only in the outer helper
 - Getting the multiplier from the vCPU field in the outer helper
 - Skipping the WRMSR in the outer helper if guest state isn't loaded

Opportunistically delete an extra newline.

No functional change intended.

Link: https://lore.kernel.org/r/20230729011608.1065019-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 4785d780cce3..7217f7532df9 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -567,7 +567,7 @@ static int svm_check_processor_compat(void)
 	return 0;
 }
 
-void __svm_write_tsc_multiplier(u64 multiplier)
+static void __svm_write_tsc_multiplier(u64 multiplier)
 {
 	preempt_disable();
 
@@ -1150,12 +1150,11 @@ static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
 	vmcb_mark_dirty(svm->vmcb, VMCB_INTERCEPTS);
 }
 
-static void svm_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 multiplier)
+void svm_write_tsc_multiplier(struct kvm_vcpu *vcpu, u64 multiplier)
 {
 	__svm_write_tsc_multiplier(multiplier);
 }
 
-
 /* Evaluate instruction intercepts that depend on guest CPUID features. */
 static void svm_recalc_instruction_intercepts(struct kvm_vcpu *vcpu,
 					      struct vcpu_svm *svm)