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

..

apic.c

xen: rename dom0_op to platform_op

2015-12-21 14:40:55 +00:00

debugfs.c

debugfs: Add support to print u32 array in debugfs

2012-04-17 00:18:36 -04:00

debugfs.h

debugfs: Add support to print u32 array in debugfs

2012-04-17 00:18:36 -04:00

efi.c

xen/efi: Directly include needed headers

2014-09-23 13:36:20 +00:00

enlighten.c

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

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

grant-table.c

xen/balloon: make alloc_xenballoon_pages() always allocate low pages

2015-10-23 14:20:05 +01:00

irq.c

asmlinkage, x86: Add explicit __visible to arch/x86/*

2014-05-05 16:07:44 -07:00

Kconfig

Merge tag 'for-linus-4.3-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2015-09-08 11:46:48 -07:00

Makefile

xen/PMU: Initialization code for Xen PMU

2015-08-20 12:25:20 +01:00

mmu.c

x86: Fix misspellings in comments

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

mmu.h

xen: make a pile of mmu pvop functions static

2011-05-20 14:25:24 -07:00

multicalls.c

x86: Replace __get_cpu_var uses

2014-08-26 13:45:49 -04:00

multicalls.h

xen: use this_cpu_xxx replace percpu_xxx funcs

2012-01-24 12:20:24 -05:00

p2m.c

x86/xen: export xen_alloc_p2m_entry()

2015-10-23 14:20:28 +01:00

pci-swiotlb-xen.c

pci-swiotlb-xen: call pci_request_acs only ifdef CONFIG_PCI

2013-11-08 15:21:44 -05:00

platform-pci-unplug.c

x86/xen: fix non-ANSI declaration of xen_has_pv_devices()

2015-08-20 12:24:13 +01:00

pmu.c

perf/x86: Move perf_event.h to its new home

2016-02-17 10:11:36 +01:00

pmu.h

xen/PMU: Intercept PMU-related MSR and APIC accesses

2015-08-20 12:25:25 +01:00

setup.c

Merge tag 'for-linus-4.4-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2015-11-04 17:32:42 -08:00

smp.c

arch/hotplug: Call into idle with a proper state

2016-03-01 20:36:57 +01:00

smp.h

x86/xen: Set EFER.NX and EFER.SCE in PVH guests

2014-10-06 10:27:47 +01:00

spinlock.c

locking/pvqspinlock: Rename QUEUED_SPINLOCK to QUEUED_SPINLOCKS

2015-05-11 09:52:09 +02:00

suspend.c

Merge tag 'for-linus-4.5-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

2016-01-12 13:05:36 -08:00

time.c

xen/x86: convert remaining timespec to timespec64 in xen_pvclock_gtod_notify

2015-12-21 14:40:59 +00:00

trace.c

xen: use generated hypervisor symbols in arch/x86/xen/trace.c

2015-03-16 14:49:13 +00:00

vdso.h

…

vga.c

xen/vga: add the xen EFI video mode support

2012-09-24 09:28:57 -04:00

xen-asm_32.S

x86/paravirt: Remove the unused irq_enable_sysexit pv op

2015-11-23 10:48:16 +01:00

xen-asm_64.S

x86/entry, x86/paravirt: Remove the unused usergs_sysret32 PV op

2015-11-23 10:48:16 +01:00

xen-asm.h

…

xen-asm.S

xen: correctly check for pending events when restoring irq flags

2012-04-27 16:04:21 -04:00

xen-head.S

x86: Fix misspellings in comments

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

xen-ops.h

x86/paravirt: Remove the unused irq_enable_sysexit pv op

2015-11-23 10:48:16 +01:00