From: Tom Lendacky <thomas.lenda...@amd.com> Implement a handler for #VC exceptions caused by RDTSC instructions.
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> [ jroe...@suse.de: Adapt to #VC handling infrastructure ] Co-developed-by: Joerg Roedel <jroe...@suse.de> Signed-off-by: Joerg Roedel <jroe...@suse.de> --- arch/x86/kernel/sev-es.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c index 5b024ee54307..afbe574126f3 100644 --- a/arch/x86/kernel/sev-es.c +++ b/arch/x86/kernel/sev-es.c @@ -665,6 +665,23 @@ static enum es_result vc_handle_wbinvd(struct ghcb *ghcb, return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0); } +static enum es_result vc_handle_rdtsc(struct ghcb *ghcb, struct es_em_ctxt *ctxt) +{ + enum es_result ret; + + ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDTSC, 0, 0); + if (ret != ES_OK) + return ret; + + if (!(ghcb_is_valid_rax(ghcb) && ghcb_is_valid_rdx(ghcb))) + return ES_VMM_ERROR; + + ctxt->regs->ax = ghcb->save.rax; + ctxt->regs->dx = ghcb->save.rdx; + + return ES_OK; +} + static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, struct ghcb *ghcb, unsigned long exit_code, @@ -679,6 +696,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, case SVM_EXIT_WRITE_DR7: result = vc_handle_dr7_write(ghcb, ctxt, early); break; + case SVM_EXIT_RDTSC: + result = vc_handle_rdtsc(ghcb, ctxt); + break; case SVM_EXIT_CPUID: result = vc_handle_cpuid(ghcb, ctxt); break; -- 2.17.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization