Andy Lutomirski 0f63ab5873 x86/iopl/64: Properly context-switch IOPL on Xen PV ...

commit b7a584598a upstream.

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>
Link: http://lkml.kernel.org/r/693c3bd7aeb4d3c27c92c622b7d0f554a458173c.1458162709.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-04-12 09:08:38 -07:00

..

apic.c

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

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

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

2016-04-12 09:08:38 -07:00

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

xen/x86/pvh: Use HVM's flush_tlb_others op

2015-12-14 13:53:40 +00:00

mmu.h

…

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

xen/PMU: PMU emulation code

2015-08-20 12:25:26 +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

xen: Use correctly the Xen memory terminologies

2015-09-08 18:03:49 +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

x86/xen: don't reset vcpu_info on a cancelled suspend

2016-01-31 11:28:53 -08:00

time.c

x86/xen/time: Migrate to new set-state interface

2015-07-30 21:25:38 +02:00

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/xen: Fix 32-bit PV guests's usage of kernel_stack

2014-04-15 15:00:14 +01:00

xen-asm_64.S

x86/asm/entry: Untangle 'system_call' into two entry points: entry_SYSCALL_64 and entry_INT80_32

2015-06-08 09:14:21 +02:00

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

xen: eliminate scalability issues from initial mapping setup

2015-08-20 12:24:18 +01:00

xen-ops.h

xen: move p2m list if conflicting with e820 map

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