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Groups > linux.kernel > #1252388
| From | John Doe <securef33d@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Xen-devel] PROBLEM: kernel panic xsave_init |
| Date | 2015-10-21 02:20 +0200 |
| Message-ID | <qlPih-2ZP-5@gated-at.bofh.it> (permalink) |
| References | (4 earlier) <qlBS3-8v7-25@gated-at.bofh.it> <qlE3x-3rm-35@gated-at.bofh.it> <qlF9g-4YG-23@gated-at.bofh.it> <qlFsC-5kZ-19@gated-at.bofh.it> <qlG5j-6l5-11@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 20/10/2015 16:27, Boris Ostrovsky wrote: > On 10/20/2015 09:43 AM, Jan Beulich wrote: >>>>> On 20.10.15 at 15:22, <boris.ostrovsky@oracle.com> wrote: >>> The reason I think its this commit is that RAX, RDX and RCX look very >>> much like arguments to xsetbv (which xstate_enable_boot_cpu() executes) >>> and RAX value is 0x1f, which has two new bits that this commit defined. >> That would be the two MPX related bits, yet us (luckily) white listing >> leaf 7 in pv_cpuid(), it is quite easy to validate that we don't expose >> this feature to PV(H) guests. > > Oh, so something like > > cpuid=['0x7:ebx=xxxxxxxxxxxxxxxxx0xxxxxxxxxxxxxx'] > > (bit 14 as zero) for John to try then. > > > -boris > >> Sadly the story is different for HVM >> guests (where the leaf handling uses black listing), but the register >> dump here clearly points to a PV guest (or Dom0). >> >> Jan >> > Jan the dump is taken from serial connection to Dom0, it does crash during boot. I just tried with xen 4.6.0 and it booted properly without xsave=0. Running gdb against /proc/kcore, with a x/10x 0xffffffff81d58fad i just get null bytes, with both xen4.4.3 (xsave=0) and 4.6.0. Tomorrow i will send you the gdb output and i will try to run it during the boot process. J. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: PROBLEM: kernel panic xsave_init John Doe <securef33d@gmail.com> - 2015-10-19 12:20 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-10-19 18:30 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init "Jan Beulich" <JBeulich@suse.com> - 2015-10-20 12:00 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init John Doe <securef33d@gmail.com> - 2015-10-20 14:20 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-10-20 15:30 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init "Jan Beulich" <JBeulich@suse.com> - 2015-10-20 15:50 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init Boris Ostrovsky <boris.ostrovsky@oracle.com> - 2015-10-20 16:30 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init "Jan Beulich" <JBeulich@suse.com> - 2015-10-20 16:50 +0200
Re: [Xen-devel] PROBLEM: kernel panic xsave_init John Doe <securef33d@gmail.com> - 2015-10-21 02:20 +0200
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