The following commit has been merged into the x86/urgent branch of tip:
Commit-ID: c25bbdb564060adaad5c3a8a10765c13487ba6a3 Gitweb: https://git.kernel.org/tip/c25bbdb564060adaad5c3a8a10765c13487ba6a3 Author: Joerg Roedel jroedel@suse.de AuthorDate: Wed, 19 May 2021 15:52:45 +02:00 Committer: Borislav Petkov bp@suse.de CommitterDate: Wed, 19 May 2021 17:13:04 +02:00
x86/sev-es: Forward page-faults which happen during emulation
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") Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Borislav Petkov bp@suse.de Cc: stable@vger.kernel.org # v5.10+ Link: https://lkml.kernel.org/r/20210519135251.30093-3-joro@8bytes.org --- 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 82bced8..1f428f4 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;