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    Subject[PATCH 60/70] x86/sev-es: Handle #DB Events
    Date
    From: Joerg Roedel <jroedel@suse.de>

    Handle #VC exceptions caused by #DB exceptions in the guest. Do not
    forward them to the hypervisor and handle them with do_debug() instead.

    Signed-off-by: Joerg Roedel <jroedel@suse.de>
    ---
    arch/x86/kernel/sev-es.c | 12 ++++++++++++
    1 file changed, 12 insertions(+)

    diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
    index f22b361f6b60..bc553aae31d2 100644
    --- a/arch/x86/kernel/sev-es.c
    +++ b/arch/x86/kernel/sev-es.c
    @@ -752,6 +752,15 @@ static enum es_result vc_handle_vmmcall(struct ghcb *ghcb,
    return ES_OK;
    }

    +static enum es_result vc_handle_db_exception(struct ghcb *ghcb,
    + struct es_em_ctxt *ctxt)
    +{
    + do_debug(ctxt->regs, 0);
    +
    + /* Exception event, do not advance RIP */
    + return ES_RETRY;
    +}
    +
    static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    struct ghcb *ghcb,
    unsigned long exit_code,
    @@ -766,6 +775,9 @@ static enum es_result vc_handle_exitcode(struct es_em_ctxt *ctxt,
    case SVM_EXIT_WRITE_DR7:
    result = vc_handle_dr7_write(ghcb, ctxt, early);
    break;
    + case SVM_EXIT_EXCP_BASE + X86_TRAP_DB:
    + result = vc_handle_db_exception(ghcb, ctxt);
    + break;
    case SVM_EXIT_EXCP_BASE + X86_TRAP_AC:
    do_alignment_check(ctxt->regs, 0);
    result = ES_RETRY;
    --
    2.17.1
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