linux-kernel - [PATCH 1/9] KVM: arm/arm64: vgic-its: fix return value for restore

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Date:   Mon, 25 Sep 2017 15:34:30 +0200
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        marc.zyngier@....com, cdall@...aro.org, peter.maydell@...aro.org,
        andre.przywara@....com, wanghaibin.wang@...wei.com
Cc:     wu.wubin@...wei.com
Subject: [PATCH 1/9] KVM: arm/arm64: vgic-its: fix return value for restore

From: wanghaibin <wanghaibin.wang@...wei.com>

This patch fix the migrate restore tables failure.

The same scene, at the destination, the restore tables
interface traversal guest memory, and check the dte/ite
is valid or not.  If all dtes/ites are invalid, we will do
try next one, and the last it will take the 1 return value,
but currently, it be treated as error. That's not correct.

This patch try to fix this problem.

Signed-off-by: wanghaibin <wanghaibin.wang@...wei.com>

---

need to CC stable

v1 -> v2:
- if (ret > 0) ret = 0
---
 virt/kvm/arm/vgic/vgic-its.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index f51c1e1..fbbc97b 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -2018,7 +2018,7 @@ static int vgic_its_restore_dte(struct vgic_its *its, u32 id,
 		return PTR_ERR(dev);
 
 	ret = vgic_its_restore_itt(its, dev);
-	if (ret) {
+	if (ret < 0) {
 		vgic_its_free_device(its->dev->kvm, dev);
 		return ret;
 	}
@@ -2141,7 +2141,7 @@ static int vgic_its_restore_device_tables(struct vgic_its *its)
 	}
 
 	if (ret > 0)
-		ret = -EINVAL;
+		ret = 0;
 
 	return ret;
 }
-- 
2.5.5