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    Subject[PATCH v7 59/72] x86/sev-es: Handle VMMCALL Events
    Date
    From: Tom Lendacky <thomas.lendacky@amd.com>

    Implement a handler for #VC exceptions caused by VMMCALL instructions.
    This patch is only a starting point, VMMCALL emulation under SEV-ES
    needs further hypervisor-specific changes to provide additional state.

    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 | 23 +++++++++++++++++++++++
    1 file changed, 23 insertions(+)

    diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
    index 0d0b6e15f7d9..db8e33280f7a 100644
    --- a/arch/x86/kernel/sev-es.c
    +++ b/arch/x86/kernel/sev-es.c
    @@ -889,6 +889,26 @@ static enum es_result vc_handle_mwait(struct ghcb *ghcb,
    return ES_OK;
    }

    +static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
    + struct es_em_ctxt *ctxt)
    +{
    + enum es_result ret;
    +
    + ghcb_set_rax(ghcb, ctxt->regs->ax);
    + ghcb_set_cpl(ghcb, user_mode(ctxt->regs) ? 3 : 0);
    +
    + ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_VMMCALL, 0, 0);
    + if (ret != ES_OK)
    + return ret;
    +
    + if (!ghcb_rax_is_valid(ghcb))
    + return ES_VMM_ERROR;
    +
    + ctxt->regs->ax = ghcb->save.rax;
    +
    + return ES_OK;
    +}
    +
    static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    struct ghcb *ghcb,
    unsigned long exit_code)
    @@ -922,6 +942,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    case SVM_EXIT_MSR:
    result = vc_handle_msr(ghcb, ctxt);
    break;
    + case SVM_EXIT_VMMCALL:
    + result = vc_handle_vmmcall(ghcb, ctxt);
    + break;
    case SVM_EXIT_WBINVD:
    result = vc_handle_wbinvd(ghcb, ctxt);
    break;
    --
    2.28.0
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