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    Subject[PATCH 49/62] x86/sev-es: Handle MWAIT/MWAITX Events
    Date
    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 <jroedel@suse.de>
    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    ---
    arch/x86/kernel/sev-es.c | 11 +++++++++++
    1 file changed, 11 insertions(+)

    diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
    index 865f510d11ba..8f1e84da6fa6 100644
    --- a/arch/x86/kernel/sev-es.c
    +++ b/arch/x86/kernel/sev-es.c
    @@ -333,6 +333,14 @@ static enum es_result handle_monitor(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
    return ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MONITOR, 0, 0);
    }

    +static enum es_result 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 ghcb_hv_call(ghcb, ctxt, SVM_EXIT_MWAIT, 0, 0);
    +}
    +
    static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt,
    struct ghcb *ghcb,
    unsigned long exit_code,
    @@ -372,6 +380,9 @@ static enum es_result handle_vc_exception(struct es_em_ctxt *ctxt,
    case SVM_EXIT_MONITOR:
    result = handle_monitor(ghcb, ctxt);
    break;
    + case SVM_EXIT_MWAIT:
    + result = handle_mwait(ghcb, ctxt);
    + break;
    case SVM_EXIT_NPF:
    result = handle_mmio(ghcb, ctxt);
    break;
    --
    2.17.1
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