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    Subject[PATCH v4 59/75] x86/sev-es: Handle MONITOR/MONITORX Events
    Date
    From: Tom Lendacky <thomas.lendacky@amd.com>

    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>
    ---
    arch/x86/kernel/sev-es.c | 13 +++++++++++++
    1 file changed, 13 insertions(+)

    diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
    index 30d6161deada..c0977bdc400e 100644
    --- a/arch/x86/kernel/sev-es.c
    +++ b/arch/x86/kernel/sev-es.c
    @@ -878,6 +878,16 @@ static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt
    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,
    struct ghcb *ghcb,
    unsigned long exit_code)
    @@ -914,6 +924,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    case SVM_EXIT_WBINVD:
    result = vc_handle_wbinvd(ghcb, ctxt);
    break;
    + case SVM_EXIT_MONITOR:
    + result = vc_handle_monitor(ghcb, ctxt);
    + break;
    case SVM_EXIT_NPF:
    result = vc_handle_mmio(ghcb, ctxt);
    break;
    --
    2.27.0
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