linux-kernel - [PATCH 3.12 30/63] KVM: arm/arm64: vgic: fix GICD

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Message-Id: <bc1a23b6ed483568e8443647e9afdcadee2dca5e.1430387326.git.jslaby@suse.cz>
Date:	Thu, 30 Apr 2015 14:11:59 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Andre Przywara <andre.przywara@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 30/63] KVM: arm/arm64: vgic: fix GICD_ICFGR register accesses

From: Andre Przywara <andre.przywara@....com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f2ae85b2ab3776b9e4e42e5b6fa090f40d396794 upstream.

Since KVM internally represents the ICFGR registers by stuffing two
of them into one word, the offset for accessing the internal
representation and the one for the MMIO based access are different.
So keep the original offset around, but adjust the internal array
offset by one bit.

Reported-by: Haibin Wang <wanghaibin.wang@...wei.com>
Signed-off-by: Andre Przywara <andre.przywara@....com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 virt/kvm/arm/vgic.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index f4e63224cda6..74a014cdcac9 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -543,11 +543,10 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
 	u32 val;
 	u32 *reg;
 
-	offset >>= 1;
 	reg = vgic_bitmap_get_reg(&vcpu->kvm->arch.vgic.irq_cfg,
-				  vcpu->vcpu_id, offset);
+				  vcpu->vcpu_id, offset >> 1);
 
-	if (offset & 2)
+	if (offset & 4)
 		val = *reg >> 16;
 	else
 		val = *reg & 0xffff;
@@ -556,13 +555,13 @@ static bool handle_mmio_cfg_reg(struct kvm_vcpu *vcpu,
 	vgic_reg_access(mmio, &val, offset,
 			ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
 	if (mmio->is_write) {
-		if (offset < 4) {
+		if (offset < 8) {
 			*reg = ~0U; /* Force PPIs/SGIs to 1 */
 			return false;
 		}
 
 		val = vgic_cfg_compress(val);
-		if (offset & 2) {
+		if (offset & 4) {
 			*reg &= 0xffff;
 			*reg |= val << 16;
 		} else {
-- 
2.3.5

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