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x86/mtrr: Don't print errors if MtrrFixDramModEn is set when SNP enabled

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SNP enabled platforms require the MtrrFixDramModeEn bit to be set across
all CPUs when SNP is enabled. Therefore, don't print error messages when
MtrrFixDramModeEn is set when bringing CPUs online.

Closes: https://lore.kernel.org/kvm/68b2d6bf-bce7-47f9-bebb-2652cc923ff9@linux.microsoft.com/
Reported-by: Jeremi Piotrowski <jpiotrowski@linux.microsoft.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240126041126.1927228-6-michael.roth@amd.com
This commit is contained in:
Ashish Kalra 2024-01-25 22:11:05 -06:00 • committed by Borislav Petkov (AMD)
parent 216d106c7f
commit e3fd08afb7
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kernel/cpu/mtrr/generic.c
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@ -108,6 +108,9 @@ static inline void k8_check_syscfg_dram_mod_en(void)
(boot_cpu_data.x86 >= 0x0f)))
return;
if (cpu_feature_enabled(X86_FEATURE_SEV_SNP))
return;
rdmsr(MSR_AMD64_SYSCFG, lo, hi);
if (lo & K8_MTRRFIXRANGE_DRAM_MODIFY) {
pr_err(FW_WARN "MTRR: CPU %u: SYSCFG[MtrrFixDramModEn]"