lkml.org 
[lkml]   [2017]   [Sep]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Date
Subject[PATCH 3.16 028/233] kvm: arm/arm64: Force reading uncached stage2 PGD
3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Suzuki K Poulose <suzuki.poulose@arm.com>

commit 2952a6070e07ebdd5896f1f5b861acad677caded upstream.

Make sure we don't use a cached value of the KVM stage2 PGD while
resetting the PGD.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Christoffer Dall <cdall@linaro.org>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
[bwh: Backported to 3.16:
- s/READ_ONCE/ACCESS_ONCE/
- Adjust filename]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
arch/arm/kvm/mmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -643,7 +643,7 @@ void kvm_free_stage2_pgd(struct kvm *kvm
spin_lock(&kvm->mmu_lock);
if (kvm->arch.pgd) {
unmap_stage2_range(kvm, 0, KVM_PHYS_SIZE);
- pgd = kvm->arch.pgd;
+ pgd = ACCESS_ONCE(kvm->arch.pgd);
kvm->arch.pgd = NULL;
}
spin_unlock(&kvm->mmu_lock);
\
 
 \ /
  Last update: 2017-09-10 01:45    [W:0.955 / U:9.440 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site