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dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf18.hostedemail.com: domain of Ashish.Kalra@amd.com designates 40.107.92.87 as permitted sender) smtp.mailfrom=Ashish.Kalra@amd.com X-Stat-Signature: ckj3ocgh6nuzbihs5b7qrtkpge1osxy4 X-Rspamd-Queue-Id: 93A031C001B X-HE-Tag: 1655766152-373036 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Brijesh Singh SEV-SNP FW >= 1.51 requires that SYSCFG.MFMD must be set. Subsequent CCP patches while require 1.51 as the minimum SEV-SNP firmware version. Signed-off-by: Brijesh Singh --- arch/x86/include/asm/msr-index.h | 3 +++ arch/x86/kernel/sev.c | 24 ++++++++++++++++++++++++ 2 files changed, 27 insertions(+) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 57a8280e283a..1e36f16daa56 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -587,6 +587,9 @@ #define MSR_AMD64_SYSCFG_SNP_EN BIT_ULL(MSR_AMD64_SYSCFG_SNP_EN_BIT) #define MSR_AMD64_SYSCFG_SNP_VMPL_EN_BIT 25 #define MSR_AMD64_SYSCFG_SNP_VMPL_EN BIT_ULL(MSR_AMD64_SYSCFG_SNP_VMPL_EN_BIT) +#define MSR_AMD64_SYSCFG_MFDM_BIT 19 +#define MSR_AMD64_SYSCFG_MFDM BIT_ULL(MSR_AMD64_SYSCFG_MFDM_BIT) + #define MSR_K8_INT_PENDING_MSG 0xc0010055 /* C1E active bits in int pending message */ #define K8_INTP_C1E_ACTIVE_MASK 0x18000000 diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 3a233b5d47c5..25c7feb367f6 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -2257,6 +2257,27 @@ static __init void snp_enable(void *arg) __snp_enable(smp_processor_id()); } +static int __mfdm_enable(unsigned int cpu) +{ + u64 val; + + if (!cpu_feature_enabled(X86_FEATURE_SEV_SNP)) + return 0; + + rdmsrl(MSR_AMD64_SYSCFG, val); + + val |= MSR_AMD64_SYSCFG_MFDM; + + wrmsrl(MSR_AMD64_SYSCFG, val); + + return 0; +} + +static __init void mfdm_enable(void *arg) +{ + __mfdm_enable(smp_processor_id()); +} + static bool get_rmptable_info(u64 *start, u64 *len) { u64 calc_rmp_sz, rmp_sz, rmp_base, rmp_end, nr_pages; @@ -2325,6 +2346,9 @@ static __init int __snp_rmptable_init(void) /* Flush the caches to ensure that data is written before SNP is enabled. */ wbinvd_on_all_cpus(); + /* MFDM must be enabled on all the CPUs prior to enabling SNP. */ + on_each_cpu(mfdm_enable, NULL, 1); + /* Enable SNP on all CPUs. */ on_each_cpu(snp_enable, NULL, 1);