[tip: x86/msr] x86/featctl: Stop using 32-bit MSR interfaces

[tip-bot2 for Juergen Gross]

The following commit has been merged into the x86/msr branch of tip:

Commit-ID:     f44da125bcecd78705ab506f6e18a4a5db1a35e1
Gitweb:        https://git.kernel.org/tip/f44da125bcecd78705ab506f6e18a4a5db1a35e1
Author:        Juergen Gross <jgross@xxxxxxxx>
AuthorDate:    Fri, 03 Jul 2026 13:24:26 +02:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Fri, 17 Jul 2026 11:30:36 +02:00

x86/featctl: Stop using 32-bit MSR interfaces

The 32-bit MSR interfaces rdmsr() and  rdmsr_safe() are planned to be
removed. Use the related 64-bit variants instead.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Link: https://patch.msgid.link/20260703112426.1763049-1-jgross@xxxxxxxx
---
 arch/x86/kernel/cpu/feat_ctl.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c
index d697572..10a9292 100644
--- a/arch/x86/kernel/cpu/feat_ctl.c
+++ b/arch/x86/kernel/cpu/feat_ctl.c
@@ -25,7 +25,8 @@ enum vmx_feature_leafs {
 
 static void init_vmx_capabilities(struct cpuinfo_x86 *c)
 {
-	u32 supported, funcs, ept, vpid, ign, low, high;
+	struct msr val;
+	u32 supported, funcs, ept, vpid;
 
 	BUILD_BUG_ON(NVMXINTS != NR_VMX_FEATURE_WORDS);
 
@@ -39,25 +40,31 @@ static void init_vmx_capabilities(struct cpuinfo_x86 *c)
 	 * as they exist on any CPU that supports VMX, i.e. we want the WARN if
 	 * the RDMSR faults.
 	 */
-	rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, ign, supported);
+	rdmsrq(MSR_IA32_VMX_PROCBASED_CTLS, val.q);
+	supported = val.h;
 	c->vmx_capability[PRIMARY_CTLS] = supported;
 
-	rdmsr_safe(MSR_IA32_VMX_PROCBASED_CTLS2, &ign, &supported);
+	rdmsrq_safe(MSR_IA32_VMX_PROCBASED_CTLS2, &val.q);
+	supported = val.h;
 	c->vmx_capability[SECONDARY_CTLS] = supported;
 
 	/* All 64 bits of tertiary controls MSR are allowed-1 settings. */
-	rdmsr_safe(MSR_IA32_VMX_PROCBASED_CTLS3, &low, &high);
-	c->vmx_capability[TERTIARY_CTLS_LOW] = low;
-	c->vmx_capability[TERTIARY_CTLS_HIGH] = high;
+	rdmsrq_safe(MSR_IA32_VMX_PROCBASED_CTLS3, &val.q);
+	c->vmx_capability[TERTIARY_CTLS_LOW] = val.l;
+	c->vmx_capability[TERTIARY_CTLS_HIGH] = val.h;
 
-	rdmsr(MSR_IA32_VMX_PINBASED_CTLS, ign, supported);
-	rdmsr_safe(MSR_IA32_VMX_VMFUNC, &ign, &funcs);
+	rdmsrq(MSR_IA32_VMX_PINBASED_CTLS, val.q);
+	supported = val.h;
+	rdmsrq_safe(MSR_IA32_VMX_VMFUNC, &val.q);
+	funcs = val.h;
 
 	/*
 	 * Except for EPT+VPID, which enumerates support for both in a single
 	 * MSR, low for EPT, high for VPID.
 	 */
-	rdmsr_safe(MSR_IA32_VMX_EPT_VPID_CAP, &ept, &vpid);
+	rdmsrq_safe(MSR_IA32_VMX_EPT_VPID_CAP, &val.q);
+	ept = val.l;
+	vpid = val.h;
 
 	/* Pin, EPT, VPID and VM-Func are merged into a single word. */
 	WARN_ON_ONCE(supported >> 16);