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| author | Ingo Molnar <mingo@kernel.org> | 2024-02-26 11:06:48 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-02-26 11:10:35 +0100 |
| commit | 2e5fc4786b7ad311393a70894c773aa106c6dbb3 (patch) | |
| tree | 5eb9d382795a6739f1c556eaf69fdcfa6b265b7e /arch/x86/kernel/cpu/amd.c | |
| parent | Merge tag 'v6.8-rc6' into x86/boot, to pick up fixes (diff) | |
| parent | crypto: ccp - Have it depend on AMD_IOMMU (diff) | |
| download | linux-2e5fc4786b7ad311393a70894c773aa106c6dbb3.tar.xz linux-2e5fc4786b7ad311393a70894c773aa106c6dbb3.zip | |
Merge branch 'x86/sev' into x86/boot, to resolve conflicts and to pick up dependent tree
We are going to queue up a number of patches that depend
on fresh changes in x86/sev - merge in that branch to
reduce the number of conflicts going forward.
Also resolve a current conflict with x86/sev.
Conflicts:
arch/x86/include/asm/coco.h
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/cpu/amd.c')
| -rw-r--r-- | arch/x86/kernel/cpu/amd.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index f3abca334199..ce89281640a9 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -20,6 +20,7 @@ #include <asm/delay.h> #include <asm/debugreg.h> #include <asm/resctrl.h> +#include <asm/sev.h> #ifdef CONFIG_X86_64 # include <asm/mmconfig.h> @@ -587,6 +588,21 @@ static void bsp_init_amd(struct cpuinfo_x86 *c) break; } + if (cpu_has(c, X86_FEATURE_SEV_SNP)) { + /* + * RMP table entry format is not architectural and it can vary by processor + * and is defined by the per-processor PPR. Restrict SNP support on the + * known CPU model and family for which the RMP table entry format is + * currently defined for. + */ + if (!boot_cpu_has(X86_FEATURE_ZEN3) && + !boot_cpu_has(X86_FEATURE_ZEN4) && + !boot_cpu_has(X86_FEATURE_ZEN5)) + setup_clear_cpu_cap(X86_FEATURE_SEV_SNP); + else if (!snp_probe_rmptable_info()) + setup_clear_cpu_cap(X86_FEATURE_SEV_SNP); + } + return; warn: @@ -605,8 +621,8 @@ static void early_detect_mem_encrypt(struct cpuinfo_x86 *c) * SME feature (set in scattered.c). * If the kernel has not enabled SME via any means then * don't advertise the SME feature. - * For SEV: If BIOS has not enabled SEV then don't advertise the - * SEV and SEV_ES feature (set in scattered.c). + * For SEV: If BIOS has not enabled SEV then don't advertise SEV and + * any additional functionality based on it. * * In all cases, since support for SME and SEV requires long mode, * don't advertise the feature under CONFIG_X86_32. @@ -641,6 +657,7 @@ clear_all: clear_sev: setup_clear_cpu_cap(X86_FEATURE_SEV); setup_clear_cpu_cap(X86_FEATURE_SEV_ES); + setup_clear_cpu_cap(X86_FEATURE_SEV_SNP); } } |