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List: xen-cvs
Subject: [Xen-changelog] [xen master] xen/arm: Disable interrupts for the entire duration of the context swit
From: patchbot () xen ! org
Date: 2013-05-24 6:11:24
Message-ID: E1UflDo-0007f3-Rs () xenbits ! xen ! org
[Download RAW message or body]
commit 9f5179a4ecafd9a15e0a066e0f935ded681bf997
Author: Jaeyong Yoo <jaeyong.yoo@samsung.com>
AuthorDate: Wed May 22 02:34:18 2013 +0000
Commit: Ian Campbell <ian.campbell@citrix.com>
CommitDate: Thu May 23 12:51:51 2013 +0100
xen/arm: Disable interrupts for the entire duration of the context switch
Not just while saving state. Otherwise there is a race between interrupts
arriving and updating the LR state and gic_restore_state overwriting them with
the saved state.
With this change we no longer need to disable interrupts in gic_restore_state.
Signed-off-by: Jaeyong Yoo <jaeyong.yoo@samsung.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
[ ijc -- rewrote commit message ]
---
xen/arch/arm/domain.c | 4 ++--
xen/arch/arm/gic.c | 2 --
2 files changed, 2 insertions(+), 4 deletions(-)
diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 9ca44ea..ee12b5f 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -226,10 +226,10 @@ static void schedule_tail(struct vcpu *prev)
{
ctxt_switch_from(prev);
- local_irq_enable();
-
ctxt_switch_to(current);
+ local_irq_enable();
+
if ( prev != current )
update_runstate_area(current);
}
diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 30bf8d1..d9940ea 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -93,11 +93,9 @@ void gic_restore_state(struct vcpu *v)
if ( is_idle_vcpu(v) )
return;
- spin_lock_irq(&gic.lock);
this_cpu(lr_mask) = v->arch.lr_mask;
for ( i=0; i<nr_lrs; i++)
GICH[GICH_LR + i] = v->arch.gic_lr[i];
- spin_unlock_irq(&gic.lock);
GICH[GICH_APR] = v->arch.gic_apr;
GICH[GICH_HCR] = GICH_HCR_EN;
isb();
--
generated by git-patchbot for /home/xen/git/xen.git#master
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