Messages in this thread Patch in this message | | | From | Tom Lendacky <> | Subject | [PATCH v3 13/14] x86/sev: Hide SVSM attestation entries if not running under an SVSM | Date | Mon, 25 Mar 2024 17:26:32 -0500 |
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Config-fs provides support to hide individual attribute entries. Using this support, base the display of the SVSM related entries on the presence of an SVSM.
Cc: Joel Becker <jlbec@evilplan.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- arch/x86/coco/core.c | 4 ++++ drivers/virt/coco/tsm.c | 14 ++++++++++---- include/linux/cc_platform.h | 8 ++++++++ 3 files changed, 22 insertions(+), 4 deletions(-)
diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c index d07be9d05cd0..efa0f648f754 100644 --- a/arch/x86/coco/core.c +++ b/arch/x86/coco/core.c @@ -12,6 +12,7 @@ #include <asm/coco.h> #include <asm/processor.h> +#include <asm/sev.h> enum cc_vendor cc_vendor __ro_after_init = CC_VENDOR_NONE; u64 cc_mask __ro_after_init; @@ -78,6 +79,9 @@ static bool noinstr amd_cc_platform_has(enum cc_attr attr) case CC_ATTR_GUEST_STATE_ENCRYPT: return sev_status & MSR_AMD64_SEV_ES_ENABLED; + case CC_ATTR_GUEST_SVSM_PRESENT: + return snp_get_vmpl(); + /* * With SEV, the rep string I/O instructions need to be unrolled * but SEV-ES supports them through the #VC handler. diff --git a/drivers/virt/coco/tsm.c b/drivers/virt/coco/tsm.c index 46f230bf13ac..d30471874e87 100644 --- a/drivers/virt/coco/tsm.c +++ b/drivers/virt/coco/tsm.c @@ -64,6 +64,12 @@ static struct tsm_report_state *to_state(struct tsm_report *report) return container_of(report, struct tsm_report_state, report); } +static bool provider_visibility(const struct config_item *item, + const struct configfs_attribute *attr) +{ + return cc_platform_has(CC_ATTR_GUEST_SVSM_PRESENT); +} + static int try_advance_write_generation(struct tsm_report *report) { struct tsm_report_state *state = to_state(report); @@ -144,7 +150,7 @@ static ssize_t tsm_report_service_provider_store(struct config_item *cfg, return len; } -CONFIGFS_ATTR_WO(tsm_report_, service_provider); +CONFIGFS_ATTR_VISIBLE_WO(tsm_report_, service_provider, provider_visibility); static ssize_t tsm_report_service_guid_store(struct config_item *cfg, const char *buf, size_t len) @@ -165,7 +171,7 @@ static ssize_t tsm_report_service_guid_store(struct config_item *cfg, return len; } -CONFIGFS_ATTR_WO(tsm_report_, service_guid); +CONFIGFS_ATTR_VISIBLE_WO(tsm_report_, service_guid, provider_visibility); static ssize_t tsm_report_service_manifest_version_store(struct config_item *cfg, const char *buf, size_t len) @@ -186,7 +192,7 @@ static ssize_t tsm_report_service_manifest_version_store(struct config_item *cfg return len; } -CONFIGFS_ATTR_WO(tsm_report_, service_manifest_version); +CONFIGFS_ATTR_VISIBLE_WO(tsm_report_, service_manifest_version, provider_visibility); static ssize_t tsm_report_inblob_write(struct config_item *cfg, const void *buf, size_t count) @@ -333,7 +339,7 @@ static ssize_t tsm_report_manifestblob_read(struct config_item *cfg, void *buf, return tsm_report_read(report, buf, count, TSM_MANIFEST); } -CONFIGFS_BIN_ATTR_RO(tsm_report_, manifestblob, NULL, TSM_OUTBLOB_MAX); +CONFIGFS_BIN_ATTR_VISIBLE_RO(tsm_report_, manifestblob, NULL, TSM_OUTBLOB_MAX, provider_visibility); #define TSM_DEFAULT_ATTRS() \ &tsm_report_attr_generation, \ diff --git a/include/linux/cc_platform.h b/include/linux/cc_platform.h index cb0d6cd1c12f..f1b4266c1484 100644 --- a/include/linux/cc_platform.h +++ b/include/linux/cc_platform.h @@ -90,6 +90,14 @@ enum cc_attr { * Examples include TDX Guest. */ CC_ATTR_HOTPLUG_DISABLED, + + /** + * @CC_ATTR_GUEST_SVSM_PRESENT: Guest is running under an SVSM + * + * The platform/OS is running as a guest/virtual machine and is + * running under a Secure VM Service Module (SVSM). + */ + CC_ATTR_GUEST_SVSM_PRESENT, }; #ifdef CONFIG_ARCH_HAS_CC_PLATFORM -- 2.43.2
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