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Allow the SEV-SNP guest to continue booting if an SVSM is detected and the hypervisor supports the SVSM feature as indicated in the GHCB hypervisor features bitmap. Signed-off-by: Tom Lendacky --- arch/x86/boot/compressed/sev.c | 12 +++++++++--- arch/x86/include/asm/sev-common.h | 1 + arch/x86/kernel/sev.c | 20 +++++++++++++++++--- 3 files changed, 27 insertions(+), 6 deletions(-) diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c index 32a1e98ffaa9..fb1e60165cd1 100644 --- a/arch/x86/boot/compressed/sev.c +++ b/arch/x86/boot/compressed/sev.c @@ -610,11 +610,13 @@ void sev_enable(struct boot_params *bp) * features. */ if (sev_status & MSR_AMD64_SEV_SNP_ENABLED) { - if (!(get_hv_features() & GHCB_HV_FT_SNP)) + u64 hv_features = get_hv_features(); + + if (!(hv_features & GHCB_HV_FT_SNP)) sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED); /* - * Enforce running at VMPL0. + * Enforce running at VMPL0 or with an SVSM. * * RMPADJUST modifies RMP permissions of a lesser-privileged (numerically * higher) privilege level. Here, clear the VMPL1 permission mask of the @@ -624,8 +626,12 @@ void sev_enable(struct boot_params *bp) * modifies permission bits, it is still ok to do so currently because Linux * SNP guests running at VMPL0 only run at VMPL0, so VMPL1 or higher * permission mask changes are a don't-care. + * + * Running at VMPL0 is not required if an SVSM is present and the hypervisor + * supports the required SVSM GHCB events. */ - if (rmpadjust((unsigned long)&boot_ghcb_page, RMP_PG_SIZE_4K, 1)) + if (rmpadjust((unsigned long)&boot_ghcb_page, RMP_PG_SIZE_4K, 1) && + !(vmpl && (hv_features & GHCB_HV_FT_SNP_MULTI_VMPL))) sev_es_terminate(SEV_TERM_SET_LINUX, GHCB_TERM_NOT_VMPL0); } diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h index 4cc716660d4b..7a9d09458989 100644 --- a/arch/x86/include/asm/sev-common.h +++ b/arch/x86/include/asm/sev-common.h @@ -118,6 +118,7 @@ enum psc_op { #define GHCB_HV_FT_SNP BIT_ULL(0) #define GHCB_HV_FT_SNP_AP_CREATION BIT_ULL(1) +#define GHCB_HV_FT_SNP_MULTI_VMPL BIT_ULL(5) /* * SNP Page State Change NAE event diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 5e71c94b952c..50754cc45161 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -2356,22 +2356,36 @@ static void dump_cpuid_table(void) * sort of indicator, and there's not really any other good place to do it, * so do it here. */ -static int __init report_cpuid_table(void) +static void __init report_cpuid_table(void) { const struct snp_cpuid_table *cpuid_table = snp_cpuid_get_table(); if (!cpuid_table->count) - return 0; + return; pr_info("Using SNP CPUID table, %d entries present.\n", cpuid_table->count); if (sev_cfg.debug) dump_cpuid_table(); +} + +static void __init report_vmpl_level(void) +{ + if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) + return; + + pr_info("SNP running at VMPL%u.\n", vmpl); +} + +static int __init report_snp_info(void) +{ + report_vmpl_level(); + report_cpuid_table(); return 0; } -arch_initcall(report_cpuid_table); +arch_initcall(report_snp_info); static int __init init_sev_config(char *str) { -- 2.43.2