From: Joerg Roedel <jroe...@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 <jroe...@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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