[PATCH 57/70] x86/sev-es: Handle MWAIT/MWAITX Events
From: Joerg Roedel <joro@8bytes.org>
Date: 2020-03-19 09:15:22
Also in:
kvm, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Tom Lendacky <thomas.lendacky@amd.com> Implement a handler for #VC exceptions caused by MWAIT and MWAITX instructions. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> [ jroedel@suse.de: Adapt to #VC handling infrastructure ] Co-developed-by: Joerg Roedel <redacted> Signed-off-by: Joerg Roedel <redacted> --- arch/x86/kernel/sev-es.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index 6bd8bc9f2e66..0ccbcc02e6f2 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c@@ -723,6 +723,15 @@ static enum es_result vc_handle_monitor(struct ghcb *ghcb, return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MONITOR, 0, 0); } +static enum es_result vc_handle_mwait(struct ghcb *ghcb, + struct es_em_ctxt *ctxt) +{ + ghcb_set_rax(ghcb, ctxt->regs->ax); + ghcb_set_rcx(ghcb, ctxt->regs->cx); + + return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MWAIT, 0, 0); +} + static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, struct ghcb *ghcb, unsigned long exit_code,
@@ -763,6 +772,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, case SVM_EXIT_MONITOR: result = vc_handle_monitor(ghcb, ctxt); break; + case SVM_EXIT_MWAIT: + result = vc_handle_mwait(ghcb, ctxt); + break; case SVM_EXIT_NPF: result = vc_handle_mmio(ghcb, ctxt); break;
--
2.17.1