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Message-ID: <20240731150811.156771-14-nikunj@amd.com>
Date: Wed, 31 Jul 2024 20:38:04 +0530
From: Nikunj A Dadhania <nikunj@....com>
To: <linux-kernel@...r.kernel.org>, <thomas.lendacky@....com>, <bp@...en8.de>,
<x86@...nel.org>, <kvm@...r.kernel.org>
CC: <mingo@...hat.com>, <tglx@...utronix.de>, <dave.hansen@...ux.intel.com>,
<pgonda@...gle.com>, <seanjc@...gle.com>, <pbonzini@...hat.com>,
<nikunj@....com>
Subject: [PATCH v11 13/20] x86/cc: Add CC_ATTR_GUEST_SECURE_TSC
Add confidential compute platform attribute CC_ATTR_GUEST_SECURE_TSC that
can be used by the guest to query whether the Secure TSC feature is active.
Signed-off-by: Nikunj A Dadhania <nikunj@....com>
---
include/linux/cc_platform.h | 8 ++++++++
arch/x86/coco/core.c | 3 +++
2 files changed, 11 insertions(+)
diff --git a/include/linux/cc_platform.h b/include/linux/cc_platform.h
index caa4b4430634..96dc61846c9d 100644
--- a/include/linux/cc_platform.h
+++ b/include/linux/cc_platform.h
@@ -88,6 +88,14 @@ enum cc_attr {
* enabled to run SEV-SNP guests.
*/
CC_ATTR_HOST_SEV_SNP,
+
+ /**
+ * @CC_ATTR_GUEST_SECURE_TSC: Secure TSC is active.
+ *
+ * The platform/OS is running as a guest/virtual machine and actively
+ * using AMD SEV-SNP Secure TSC feature.
+ */
+ CC_ATTR_GUEST_SECURE_TSC,
};
#ifdef CONFIG_ARCH_HAS_CC_PLATFORM
diff --git a/arch/x86/coco/core.c b/arch/x86/coco/core.c
index 0f81f70aca82..00df00e2cb4a 100644
--- a/arch/x86/coco/core.c
+++ b/arch/x86/coco/core.c
@@ -100,6 +100,9 @@ static bool noinstr amd_cc_platform_has(enum cc_attr attr)
case CC_ATTR_HOST_SEV_SNP:
return cc_flags.host_sev_snp;
+ case CC_ATTR_GUEST_SECURE_TSC:
+ return sev_status & MSR_AMD64_SNP_SECURE_TSC;
+
default:
return false;
}
--
2.34.1
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