Andy Lutomirski b7a584598a x86/iopl/64: Properly context-switch IOPL on Xen PV ...

On Xen PV, regs->flags doesn't reliably reflect IOPL and the
exit-to-userspace code doesn't change IOPL.  We need to context
switch it manually.

I'm doing this without going through paravirt because this is
specific to Xen PV.  After the dust settles, we can merge this with
the 32-bit code, tidy up the iopl syscall implementation, and remove
the set_iopl pvop entirely.

Fixes XSA-171.

Reviewewd-by: Jan Beulich <JBeulich@suse.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Vrabel <david.vrabel@citrix.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/693c3bd7aeb4d3c27c92c622b7d0f554a458173c.1458162709.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2016-03-17 09:49:26 +01:00

..

boot

Merge branch 'x86-boot-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-15 10:02:25 -07:00

configs

x86/defconfigs/32: Set CONFIG_FRAME_WARN to the Kconfig default

2016-03-09 14:53:41 +01:00

crypto

Merge branch 'x86/urgent' into x86/asm, to pick up fixes

2016-02-18 09:28:03 +01:00

entry

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

events

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

ia32

Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-11-03 21:05:40 -08:00

include

x86/iopl/64: Properly context-switch IOPL on Xen PV

2016-03-17 09:49:26 +01:00

kernel

x86/iopl/64: Properly context-switch IOPL on Xen PV

2016-03-17 09:49:26 +01:00

kvm

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

lguest

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-14 17:58:53 -07:00

lib

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

math-emu

Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-11-03 21:05:40 -08:00

mm

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

net

bpf, x86: detect/optimize loading 0 immediates

2015-12-18 16:04:51 -05:00

oprofile

x86/cpufeature: Carve out X86_FEATURE_*

2016-01-30 11:22:17 +01:00

pci

Merge tag 'pci-v4.5-fixes-3' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

2016-02-27 12:33:42 -08:00

platform

Merge branch 'x86/cleanups' into x86/urgent

2016-03-17 09:44:57 +01:00

power

x86/pm: Introduce quirk framework to save/restore extra MSR registers around suspend/resume

2015-11-26 10:04:53 +01:00

purgatory

x86: Fix misspellings in comments

2016-02-24 08:44:58 +01:00

ras

x86/ras/mce_amd_inj: Inject bank 4 errors on the NBC

2015-10-12 16:15:48 +02:00

realmode

UBSAN: run-time undefined behavior sanity checker

2016-01-20 17:09:18 -08:00

tools

x86, build: replace Perl script with Shell script

2015-01-26 13:37:18 -08:00

um

Merge tag 'v4.5-rc7' into x86/asm, to pick up SMAP fix

2016-03-07 09:27:30 +01:00

video

x86/video: Don't assume all FB devices are PCI devices

2016-03-15 11:08:26 +01:00

xen

x86/iopl/64: Properly context-switch IOPL on Xen PV

2016-03-17 09:49:26 +01:00

.gitignore

x86/build: Add arch/x86/purgatory/ make generated files to gitignore

2014-10-09 09:29:46 +02:00

Kbuild

perf/x86: Move perf_event.c ............... => x86/events/core.c

2016-02-09 10:23:49 +01:00

Kconfig

Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-15 10:39:22 -07:00

Kconfig.cpu

x86/Kconfig/cpus: Fix/complete CPU type help texts

2015-10-21 11:12:56 +02:00

Kconfig.debug

Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2016-03-15 09:32:27 -07:00

Makefile

Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

2015-11-04 09:11:12 -08:00

Makefile_32.cpu

…

Makefile.um

kbuild: use relative path more to include Makefile

2015-04-02 16:42:08 +02:00