The hypervisor should not be intercepting RDTSC/RDTSCP when Secure TSC is enabled. A #VC exception will be generated if the RDTSC/RDTSCP instructions are being intercepted. If this should occur and Secure TSC is enabled, terminate guest execution. Signed-off-by: Nikunj A Dadhania <nikunj@xxxxxxx> Tested-by: Peter Gonda <pgonda@xxxxxxxxxx> --- arch/x86/kernel/sev-shared.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index ccb0915e84e1..716aea6fc90c 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -991,6 +991,16 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghcb, bool rdtscp = (exit_code == SVM_EXIT_RDTSCP); enum es_result ret; + /* + * RDTSC and RDTSCP should not be intercepted when Secure TSC is + * enabled. Terminate the SNP guest when the interception is enabled. + * This file is included from kernel/sev.c and boot/compressed/sev.c, + * use sev_status here as cpu_feature_enabled() is not available when + * compiling boot/compressed/sev.c. + */ + if (sev_status & MSR_AMD64_SNP_SECURE_TSC) + return ES_VMM_ERROR; + ret = sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0); if (ret != ES_OK) return ret; -- 2.34.1
