[tip: x86/sev] x86/tsc: Init the TSC for Secure TSC guests

tip-bot2 for Nikunj A Dadhania
2025-01-09T09:43:46Z

The following commit has been merged into the x86/sev branch of tip:

Commit-ID: 73bbf3b0fbba9aa27fef07a1fbd837661a863f03
Gitweb: https://git.kernel.org/tip/73bbf3b0fbba9aa27fef07a1fbd837661a863f03
Author: Nikunj A Dadhania <nikunj@amd.com>
AuthorDate: Mon, 06 Jan 2025 18:16:30 +05:30
Committer: Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Wed, 08 Jan 2025 21:26:19 +01:00

x86/tsc: Init the TSC for Secure TSC guests

Use the GUEST_TSC_FREQ MSR to discover the TSC frequency instead of
relying on kvm-clock based frequency calibration. Override both CPU and
TSC frequency calibration callbacks with securetsc_get_tsc_khz(). Since
the difference between CPU base and TSC frequency does not apply in this
case, the same callback is being used.

[ bp: Carve out from
https://lore.kernel.org/r/20250106124633.1418972-11-nikunj@amd.com ]

Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250106124633.1418972-11-nikunj@amd.com
---
arch/x86/coco/sev/core.c | 21 +++++++++++++++++++++
arch/x86/include/asm/sev.h | 2 ++
arch/x86/kernel/tsc.c | 4 ++++
3 files changed, 27 insertions(+)

diff --git a/arch/x86/coco/sev/core.c b/arch/x86/coco/sev/core.c
index 106bded..65d676c 100644
--- a/arch/x86/coco/sev/core.c
+++ b/arch/x86/coco/sev/core.c
@@ -103,6 +103,7 @@ static u64 secrets_pa __ro_after_init;
*/
static u64 snp_tsc_scale __ro_after_init;
static u64 snp_tsc_offset __ro_after_init;
+static u64 snp_tsc_freq_khz __ro_after_init;

/* #VC handler runtime per-CPU data */
struct sev_es_runtime_data {
@@ -3278,3 +3279,23 @@ void __init snp_secure_tsc_prepare(void)

pr_debug("SecureTSC enabled");
}
+
+static unsigned long securetsc_get_tsc_khz(void)
+{
+ return snp_tsc_freq_khz;
+}
+
+void __init snp_secure_tsc_init(void)
+{
+ unsigned long long tsc_freq_mhz;
+
+ if (!cc_platform_has(CC_ATTR_GUEST_SNP_SECURE_TSC))
+ return;
+
+ setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
+ rdmsrl(MSR_AMD64_GUEST_TSC_FREQ, tsc_freq_mhz);
+ snp_tsc_freq_khz = (unsigned long)(tsc_freq_mhz * 1000);
+
+ x86_platform.calibrate_cpu = securetsc_get_tsc_khz;
+ x86_platform.calibrate_tsc = securetsc_get_tsc_khz;
+}
diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index bdcdaac..5d9685f 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -482,6 +482,7 @@ int snp_send_guest_request(struct snp_msg_desc *mdesc, struct snp_guest_req *req
struct snp_guest_request_ioctl *rio);

void __init snp_secure_tsc_prepare(void);
+void __init snp_secure_tsc_init(void);

#else /* !CONFIG_AMD_MEM_ENCRYPT */

@@ -524,6 +525,7 @@ static inline void snp_msg_free(struct snp_msg_desc *mdesc) { }
static inline int snp_send_guest_request(struct snp_msg_desc *mdesc, struct snp_guest_req *req,
struct snp_guest_request_ioctl *rio) { return -ENODEV; }
static inline void __init snp_secure_tsc_prepare(void) { }
+static inline void __init snp_secure_tsc_init(void) { }

#endif /* CONFIG_AMD_MEM_ENCRYPT */

diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 67aeaba..0864b31 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -30,6 +30,7 @@
#include <asm/i8259.h>
#include <asm/topology.h>
#include <asm/uv/uv.h>
+#include <asm/sev.h>

unsigned int __read_mostly cpu_khz; /* TSC clocks / usec, not used here */
EXPORT_SYMBOL(cpu_khz);
@@ -1515,6 +1516,9 @@ void __init tsc_early_init(void)
/* Don't change UV TSC multi-chassis synchronization */
if (is_early_uv_system())
return;
+
+ snp_secure_tsc_init();
+
if (!determine_cpu_tsc_frequencies(true))
return;
tsc_enable_sched_clock();