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(+)
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;