On Fri, Mar 20, 2020 at 12:20 AM Fangrui Song <mask...@google.com> wrote:
> On 2020-03-19, Christian Ehrhardt wrote: > >Some hardened gcc v9 compilers (such as the one in Ubuntu) > >default this option which for seabios leads to emulation errors > >when running in KVM (does not trigger in TCG) on older intel > >chips of the Penryn generation (~2006-2008). > > > >Symptom in KVM looks like: > > KVM internal error. Suberror: 1 > > emulation failure > > EAX=00000000 EBX=00000000 ECX=000086d4 EDX=00000000 > > ESI=00000000 EDI=00000000 EBP=000086d4 ESP=00006d7c > > EIP=00007acf EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 > > ES =0000 00000000 ffffffff 00809300 > > CS =f000 000f0000 ffffffff 00809b00 > > SS =0000 00000000 ffffffff 00809300 > > DS =0000 00000000 ffffffff 00809300 > > FS =0000 00000000 ffffffff 00809300 > > GS =0000 00000000 ffffffff 00809300 > > LDT=0000 00000000 0000ffff 00008200 > > TR =0000 00000000 0000ffff 00008b00 > > GDT= 000f6200 00000037 > > IDT= 00000000 000003ff > > CR0=00000010 CR2=00000000 CR3=00000000 CR4=00000000 > > DR0=0000000000000000 DR1=0000000000000000 > > DR2=0000000000000000 DR3=0000000000000000 > > DR6=00000000ffff0ff0 DR7=0000000000000400 > > EFER=0000000000000000 > > Code=b8 90 d9 00 00 66 e8 6b f7 ff ff 66 b8 0a 00 00 > > 00 e9 61 f2 <f3> 0f 1e fb 66 57 66 56 66 53 66 53 > > 66 89 c7 67 66 89 14 24 66 89 ce 66 e8 15 f8 ff ff 88 > > > >URL: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1866870 > >Signed-off-by: Christian Ehrhardt <christian.ehrha...@canonical.com> > >--- > > Makefile | 1 + > > 1 file changed, 1 insertion(+) > > > >diff --git a/Makefile b/Makefile > >index 5f7d5370..9e8188e5 100644 > >--- a/Makefile > >+++ b/Makefile > >@@ -69,6 +69,7 @@ COMMONCFLAGS += $(call > cc-option,$(CC),-fno-stack-protector,) > > COMMONCFLAGS += $(call cc-option,$(CC),-fno-stack-protector-all,) > > COMMONCFLAGS += $(call cc-option,$(CC),-fstack-check=no,) > > COMMONCFLAGS += $(call cc-option,$(CC),-Wno-address-of-packed-member,) > >+COMMONCFLAGS += $(call cc-option,$(CC),-fcf-protection=none,) > > COMMA := , > > > > CFLAGS32FLAT := $(COMMONCFLAGS) -DMODE16=0 -DMODESEGMENT=0 > > If this is related to endbr32/endbr64 interpretation failures, please > make it clear in the description. > I didn't know it was related to "endbr32/endbr64 interpretation failures" when I was writing the patch :-) I only learned about that when David commented on the LP bug. But if that helps I can easily add mentioning that in a v2 ... -- Christian Ehrhardt Staff Engineer, Ubuntu Server Canonical Ltd
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