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    Subject[PATCH v7 55/72] x86/sev-es: Handle RDPMC Events
    Date
    From: Tom Lendacky <thomas.lendacky@amd.com>

    Implement a handler for #VC exceptions caused by RDPMC 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 | 22 ++++++++++++++++++++++
    1 file changed, 22 insertions(+)

    diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
    index 5c155f307129..2ee600f3184b 100644
    --- a/arch/x86/kernel/sev-es.c
    +++ b/arch/x86/kernel/sev-es.c
    @@ -853,6 +853,25 @@ static enum es_result vc_handle_wbinvd(struct ghcb *ghcb,
    return sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_WBINVD, 0, 0);
    }

    +static enum es_result vc_handle_rdpmc(struct ghcb *ghcb, struct es_em_ctxt *ctxt)
    +{
    + enum es_result ret;
    +
    + ghcb_set_rcx(ghcb, ctxt->regs->cx);
    +
    + ret = sev_es_ghcb_hv_call(ghcb, ctxt, SVM_EXIT_RDPMC, 0, 0);
    + if (ret != ES_OK)
    + return ret;
    +
    + if (!(ghcb_rax_is_valid(ghcb) && ghcb_rdx_is_valid(ghcb)))
    + return ES_VMM_ERROR;
    +
    + ctxt->regs->ax = ghcb->save.rax;
    + ctxt->regs->dx = ghcb->save.rdx;
    +
    + return ES_OK;
    +}
    +
    static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    struct ghcb *ghcb,
    unsigned long exit_code)
    @@ -870,6 +889,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    case SVM_EXIT_RDTSCP:
    result = vc_handle_rdtsc(ghcb, ctxt, exit_code);
    break;
    + case SVM_EXIT_RDPMC:
    + result = vc_handle_rdpmc(ghcb, ctxt);
    + break;
    case SVM_EXIT_CPUID:
    result = vc_handle_cpuid(ghcb, ctxt);
    break;
    --
    2.28.0
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