x86/mce: Use mce_rdmsrl() in severity checking code

MCA has its own special MSR accessors. Use them.

No functional changes.

Signed-off-by: Borislav Petkov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: suryasaimadhu

arch/x86/kernel/cpu/mce/core.c

@@ -362,7 +362,7 @@ void ex_handler_msr_mce(struct pt_regs *regs, bool wrmsr)
 }
 
 /* MSR access wrappers used for error injection */
-static noinstr u64 mce_rdmsrl(u32 msr)
+noinstr u64 mce_rdmsrl(u32 msr)
 {
 	DECLARE_ARGS(val, low, high);
 

arch/x86/kernel/cpu/mce/internal.h

@@ -207,4 +207,6 @@ static inline void pentium_machine_check(struct pt_regs *regs) {}
 static inline void winchip_machine_check(struct pt_regs *regs) {}
 #endif
 
+noinstr u64 mce_rdmsrl(u32 msr);
+
 #endif /* __X86_MCE_INTERNAL_H__ */

arch/x86/kernel/cpu/mce/severity.c

@@ -288,8 +288,7 @@ static int error_context(struct mce *m, struct pt_regs *regs)
 
 static int mce_severity_amd_smca(struct mce *m, enum context err_ctx)
 {
-	u32 addr = MSR_AMD64_SMCA_MCx_CONFIG(m->bank);
-	u32 low, high;
+	u64 mcx_cfg;
 
 	/*
 	 * We need to look at the following bits:
@@ -300,11 +299,10 @@ static int mce_severity_amd_smca(struct mce *m, enum context err_ctx)
 	if (!mce_flags.succor)
 		return MCE_PANIC_SEVERITY;
 
-	if (rdmsr_safe(addr, &low, &high))
-		return MCE_PANIC_SEVERITY;
+	mcx_cfg = mce_rdmsrl(MSR_AMD64_SMCA_MCx_CONFIG(m->bank));
 
 	/* TCC (Task context corrupt). If set and if IN_KERNEL, panic. */
-	if ((low & MCI_CONFIG_MCAX) &&
+	if ((mcx_cfg & MCI_CONFIG_MCAX) &&
 	    (m->status & MCI_STATUS_TCC) &&
 	    (err_ctx == IN_KERNEL))
 		return MCE_PANIC_SEVERITY;