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xen: fix RMW when unmasking events 

xen_irq_enable_direct and xen_sysexit were using "andw $0x00ff,
XEN_vcpu_info_pending(vcpu)" to unmask events and test for pending ones
in one instuction.

Unfortunately, the pending flag must be modified with a locked operation
since it can be set by another CPU, and the unlocked form of this
operation was causing the pending flag to get lost, allowing the processor
to return to usermode with pending events and ultimately deadlock.

The simple fix would be to make it a locked operation, but that's rather
costly and unnecessary.  The fix here is to split the mask-clearing and
pending-testing into two instructions; the interrupt window between
them is of no concern because either way pending or new events will
be processed.

This should fix lingering bugs in using direct vcpu structure access too.

[ Stable: needed in 2.6.24.x ]

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stable <stable@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2008-03-17 16:36:52 -07:00 committed by Ingo Molnar
parent 5abbcf2992
commit 04c44a080d
2 changed files with 8 additions and 3 deletions
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2
arch/x86/xen/enlighten.c
View File

@ -95,7 +95,7 @@ struct shared_info *HYPERVISOR_shared_info = (void *)&dummy_shared_info;
*
* 0: not available, 1: available
*/
static int have_vcpu_info_placement = 0;
static int have_vcpu_info_placement = 1;
static void __init xen_vcpu_setup(int cpu)
{

9
arch/x86/xen/xen-asm.S
View File

@ -33,12 +33,17 @@
events, then enter the hypervisor to get them handled.
*/
ENTRY(xen_irq_enable_direct)
/* Clear mask and test pending */
andw $0x00ff, PER_CPU_VAR(xen_vcpu_info)+XEN_vcpu_info_pending
/* Unmask events */
movb $0, PER_CPU_VAR(xen_vcpu_info)+XEN_vcpu_info_mask
/* Preempt here doesn't matter because that will deal with
any pending interrupts. The pending check may end up being
run on the wrong CPU, but that doesn't hurt. */
/* Test for pending */
testb $0xff, PER_CPU_VAR(xen_vcpu_info)+XEN_vcpu_info_pending
jz 1f
2: call check_events
1:
ENDPATCH(xen_irq_enable_direct)