Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1522354
| From | Dmitry Vyukov <dvyukov@google.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: kvm: WARNING in em_jmp_far |
| Date | 2016-11-15 06:40 +0100 |
| Message-ID | <sDEDn-I6-9@gated-at.bofh.it> (permalink) |
| References | <sDEal-vS-1@gated-at.bofh.it> <sDEDn-I6-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Nov 15, 2016 at 6:24 AM, Nadav Amit <nadav.amit@gmail.com> wrote: > >> On Nov 14, 2016, at 9:06 PM, Dmitry Vyukov <dvyukov@google.com> wrote: >> >> Hello, >> >> The following program triggers WARNING in em_jmp_far: >> https://gist.githubusercontent.com/dvyukov/16bfd3d68fa7d5461101ef74e07796e4/raw/e6d663980681f2c5838ff6cd361cede7d3204838/gistfile1.txt >> >> >> WARNING: CPU: 1 PID: 15748 at arch/x86/kvm/emulate.c:2128 em_jmp_far+0x4a7/0x530 > > I don’t know how to “read” the test, but it seems that this warning > can be triggered if CS base/limit cause a #GP exception when EIP > is loaded. > > I think it safe to remove this warning (which I introduced) as well as > the redundant “return rc” that follows it. The code should handle the > emulation correctly regardless of the warning. There was also a similar WARNING in em_ret_far: https://groups.google.com/forum/#!msg/syzkaller/o5ZftARBhrs/r1ivQ-HtBgAJ Please mail a fix and add a test. Thanks
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
kvm: WARNING in em_jmp_far Dmitry Vyukov <dvyukov@google.com> - 2016-11-15 06:10 +0100
Re: kvm: WARNING in em_jmp_far Nadav Amit <nadav.amit@gmail.com> - 2016-11-15 06:40 +0100
Re: kvm: WARNING in em_jmp_far Dmitry Vyukov <dvyukov@google.com> - 2016-11-15 06:40 +0100
Re: kvm: WARNING in em_jmp_far Nadav Amit <nadav.amit@gmail.com> - 2016-11-15 06:40 +0100
Re: kvm: WARNING in em_jmp_far Paolo Bonzini <pbonzini@redhat.com> - 2016-11-15 11:50 +0100
csiph-web