linux-kernel - [PATCH 4.9 042/148] KVM: arm/arm64: Fix broken GICH

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Message-Id: <20171212124432.935323890@linuxfoundation.org>
Date:   Tue, 12 Dec 2017 13:44:12 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Christoffer Dall <christoffer.dall@...aro.org>
Subject: [PATCH 4.9 042/148] KVM: arm/arm64: Fix broken GICH_ELRSR big endian conversion

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

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

From: Christoffer Dall <christoffer.dall@...aro.org>

commit fc396e066318c0a02208c1d3f0b62950a7714999 upstream.

We are incorrectly rearranging 32-bit words inside a 64-bit typed value
for big endian systems, which would result in never marking a virtual
interrupt as inactive on big endian systems (assuming 32 or fewer LRs on
the hardware).  Fix this by not doing any word order manipulation for
the typed values.

Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 virt/kvm/arm/hyp/vgic-v2-sr.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/virt/kvm/arm/hyp/vgic-v2-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v2-sr.c
@@ -77,11 +77,7 @@ static void __hyp_text save_elrsr(struct
 	else
 		elrsr1 = 0;
 
-#ifdef CONFIG_CPU_BIG_ENDIAN
-	cpu_if->vgic_elrsr = ((u64)elrsr0 << 32) | elrsr1;
-#else
 	cpu_if->vgic_elrsr = ((u64)elrsr1 << 32) | elrsr0;
-#endif
 }
 
 static void __hyp_text save_lrs(struct kvm_vcpu *vcpu, void __iomem *base)