Commit 15bbc1b2 authored by Marc Zyngier's avatar Marc Zyngier Committed by Linus Torvalds

ARM: KVM: fix unbalanced get_cpu() in access_dcsw

In the very unlikely event where a guest would be foolish enough to
*read* from a write-only cache maintainance register, we end up
with preemption disabled, due to a misplaced get_cpu().

Just move the "is_write" test outside of the critical section.
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarChristoffer Dall <cdall@cs.columbia.edu>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fca83168
......@@ -79,11 +79,11 @@ static bool access_dcsw(struct kvm_vcpu *vcpu,
u32 val;
int cpu;
cpu = get_cpu();
if (!p->is_write)
return read_from_write_only(vcpu, p);
cpu = get_cpu();
cpumask_setall(&vcpu->arch.require_dcache_flush);
cpumask_clear_cpu(cpu, &vcpu->arch.require_dcache_flush);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment