From: Haibin Wang <wanghaibin.wang@huawei.com>
Date: Tue, 29 Apr 2014 06:49:17 +0000 (+0800)
Subject: KVM: ARM: vgic: Fix the overlap check action about setting the GICD & GICC base address.
X-Git-Tag: v3.12.42~33
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=68779c62b1d0d0af82077e6ff03140e3fd24f940;p=thirdparty%2Fkernel%2Fstable.git

KVM: ARM: vgic: Fix the overlap check action about setting the GICD & GICC base address.

commit 30c2117085bc4e05d091cee6eba79f069b41a9cd upstream.

Currently below check in vgic_ioaddr_overlap will always succeed,
because the vgic dist base and vgic cpu base are still kept UNDEF
after initialization. The code as follows will be return forever.

	if (IS_VGIC_ADDR_UNDEF(dist) || IS_VGIC_ADDR_UNDEF(cpu))
                return 0;

So, before invoking the vgic_ioaddr_overlap, it needs to set the
corresponding base address firstly.

Signed-off-by: Haibin Wang <wanghaibin.wang@huawei.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 74a014cdcac9d..46221c99334f7 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1475,10 +1475,11 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
 	if (addr + size < addr)
 		return -EINVAL;
 
+	*ioaddr = addr;
 	ret = vgic_ioaddr_overlap(kvm);
 	if (ret)
-		return ret;
-	*ioaddr = addr;
+		*ioaddr = VGIC_ADDR_UNDEF;
+
 	return ret;
 }