[PATCH 59/70] x86/sev-es: Handle #AC Events

[Joerg Roedel]

From: Joerg Roedel <jroedel@xxxxxxx>

Implement a handler for #VC exceptions caused by #AC exceptions. The #AC
exception is just forwarded to do_alignment_check() and not pushed down
to the hypervisor, as requested by the SEV-ES GHCB Standardization
Specification.

Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 arch/x86/kernel/sev-es.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kernel/sev-es.c b/arch/x86/kernel/sev-es.c
index efb392e6f483..f22b361f6b60 100644
--- a/arch/x86/kernel/sev-es.c
+++ b/arch/x86/kernel/sev-es.c
@@ -766,6 +766,10 @@ 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_AC:
+		do_alignment_check(ctxt->regs, 0);
+		result = ES_RETRY;
+		break;
 	case SVM_EXIT_RDTSC:
 	case SVM_EXIT_RDTSCP:
 		result = vc_handle_rdtsc(ghcb, ctxt, exit_code);
-- 
2.17.1