KVM: SVM: Move svm_msrpm_offset() to nested.c

Move svm_msrpm_offset() from svm.c to nested.c now that all usage of the
u32-index offsets is nested virtualization specific.

No functional change intended.

Link: https://lore.kernel.org/r/20250610225737.156318-26-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: sean-jc

arch/x86/kvm/svm/nested.c

@@ -197,6 +197,29 @@ void recalc_intercepts(struct vcpu_svm *svm)
 static int nested_svm_msrpm_merge_offsets[6] __ro_after_init;
 static int nested_svm_nr_msrpm_merge_offsets __ro_after_init;
 
+static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
+
+static u32 svm_msrpm_offset(u32 msr)
+{
+	u32 offset;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(msrpm_ranges); i++) {
+		if (msr < msrpm_ranges[i] ||
+		    msr >= msrpm_ranges[i] + SVM_MSRS_PER_RANGE)
+			continue;
+
+		offset  = (msr - msrpm_ranges[i]) / SVM_MSRS_PER_BYTE;
+		offset += (i * SVM_MSRPM_BYTES_PER_RANGE);  /* add range offset */
+
+		/* Now we have the u8 offset - but need the u32 offset */
+		return offset / 4;
+	}
+
+	/* MSR not in any range */
+	return MSR_INVALID;
+}
+
 int __init nested_svm_init_msrpm_merge_offsets(void)
 {
 	static const u32 merge_msrs[] __initconst = {

arch/x86/kvm/svm/svm.c

@@ -196,29 +196,6 @@ static DEFINE_MUTEX(vmcb_dump_mutex);
  */
 static int tsc_aux_uret_slot __read_mostly = -1;
 
-static const u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000};
-
-u32 svm_msrpm_offset(u32 msr)
-{
-	u32 offset;
-	int i;
-
-	for (i = 0; i < ARRAY_SIZE(msrpm_ranges); i++) {
-		if (msr < msrpm_ranges[i] ||
-		    msr >= msrpm_ranges[i] + SVM_MSRS_PER_RANGE)
-			continue;
-
-		offset  = (msr - msrpm_ranges[i]) / SVM_MSRS_PER_BYTE;
-		offset += (i * SVM_MSRPM_BYTES_PER_RANGE);  /* add range offset */
-
-		/* Now we have the u8 offset - but need the u32 offset */
-		return offset / 4;
-	}
-
-	/* MSR not in any range */
-	return MSR_INVALID;
-}
-
 static int get_npt_level(void)
 {
 #ifdef CONFIG_X86_64

arch/x86/kvm/svm/svm.h

@@ -666,7 +666,6 @@ BUILD_SVM_MSR_BITMAP_HELPERS(void, set, __set)
 /* svm.c */
 extern bool dump_invalid_vmcb;
 
-u32 svm_msrpm_offset(u32 msr);
 u32 *svm_vcpu_alloc_msrpm(void);
 void svm_vcpu_free_msrpm(u32 *msrpm);
 void svm_copy_lbrs(struct vmcb *to_vmcb, struct vmcb *from_vmcb);