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[v2,2/8] x86/sev-es: Forward page-faults which happen during emulation

Message ID 20210519135251.30093-3-joro@8bytes.org
State New
Headers show
Series [tip:,x86/urgent] x86/sev-es: Forward page-faults which happen during emulation | expand

Commit Message

Joerg Roedel May 19, 2021, 1:52 p.m. UTC 
From: Joerg Roedel <jroedel@suse.de>

When emulating guest instructions for MMIO or IOIO accesses the #VC
handler might get a page-fault and will not be able to complete. Forward
the page-fault in this case to the correct handler instead of killing
the machine.

Fixes: 0786138c78e7 ("x86/sev-es: Add a Runtime #VC Exception Handler")
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---
 arch/x86/kernel/sev.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
index 82bced88153b..1f428f401bed 100644
--- a/arch/x86/kernel/sev.c
+++ b/arch/x86/kernel/sev.c
@@ -1270,6 +1270,10 @@  static __always_inline void vc_forward_exception(struct es_em_ctxt *ctxt)
 	case X86_TRAP_UD:
 		exc_invalid_op(ctxt->regs);
 		break;
+	case X86_TRAP_PF:
+		write_cr2(ctxt->fi.cr2);
+		exc_page_fault(ctxt->regs, error_code);
+		break;
 	case X86_TRAP_AC:
 		exc_alignment_check(ctxt->regs, error_code);
 		break;