linux-kernel - [PATCH 3.14 13/17] ARM64: KVM: store kvm_vcpu_fault_info est

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Message-Id: <20150627010820.626765740@linuxfoundation.org>
Date:	Fri, 26 Jun 2015 18:08:35 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Victor Kamensky <victor.kamensky@...aro.org>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>
Subject: [PATCH 3.14 13/17] ARM64: KVM: store kvm_vcpu_fault_info est_el2 as word

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

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

From: Victor Kamensky <victor.kamensky@...aro.org>

commit ba083d20d8cfa9e999043cd89c4ebc964ccf8927 upstream.

esr_el2 field of struct kvm_vcpu_fault_info has u32 type.
It should be stored as word. Current code works in LE case
because existing puts least significant word of x1 into
esr_el2, and it puts most significant work of x1 into next
field, which accidentally is OK because it is updated again
by next instruction. But existing code breaks in BE case.

Signed-off-by: Victor Kamensky <victor.kamensky@...aro.org>
Acked-by: Christoffer Dall <christoffer.dall@...aro.org>
Acked-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm64/kvm/hyp.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm64/kvm/hyp.S
+++ b/arch/arm64/kvm/hyp.S
@@ -830,7 +830,7 @@ el1_trap:
 	mrs	x2, far_el2
 
 2:	mrs	x0, tpidr_el2
-	str	x1, [x0, #VCPU_ESR_EL2]
+	str	w1, [x0, #VCPU_ESR_EL2]
 	str	x2, [x0, #VCPU_FAR_EL2]
 	str	x3, [x0, #VCPU_HPFAR_EL2]
 


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