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x86/sev-es: Handle MONITOR/MONITORX Events

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Implement a handler for #VC exceptions caused by MONITOR and MONITORX
instructions.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
[ jroedel@suse.de: Adapt to #VC handling infrastructure ]
Co-developed-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-58-joro@8bytes.org
This commit is contained in:
Tom Lendacky 2020-09-07 15:15:58 +02:00 committed by Borislav Petkov
parent 8b4ce83707
commit 0c2fd2ef64
1 changed files with 13 additions and 0 deletions
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13
arch/x86/kernel/sev-es.c
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@ -872,6 +872,16 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt
return ES_OK; return ES_OK;
} }
static enum es_result vc_handle_monitor(struct ghcb *ghcb,
struct es_em_ctxt *ctxt)
{
/*
* Treat it as a NOP and do not leak a physical address to the
* hypervisor.
*/
return ES_OK;
}
static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt, static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
struct ghcb *ghcb, struct ghcb *ghcb,
unsigned long exit_code) unsigned long exit_code)
@ -908,6 +918,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
case SVM_EXIT_WBINVD: case SVM_EXIT_WBINVD:
result = vc_handle_wbinvd(ghcb, ctxt); result = vc_handle_wbinvd(ghcb, ctxt);
break; break;
case SVM_EXIT_MONITOR:
result = vc_handle_monitor(ghcb, ctxt);
break;
case SVM_EXIT_NPF: case SVM_EXIT_NPF:
result = vc_handle_mmio(ghcb, ctxt); result = vc_handle_mmio(ghcb, ctxt);
break; break;