linux-kernel - [PATCH 3.12 37/63] arm64: KVM: export demux regids as KVM_REG

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Date:	Thu, 30 Apr 2015 14:12:06 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Alex Bennée <alex.bennee@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 37/63] arm64: KVM: export demux regids as KVM_REG_ARM64

From: Alex Bennée <alex.bennee@...aro.org>

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

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

commit efd48ceacea78e4d4656aa0a6bf4c5b92ed22130 upstream.

I suspect this is a -ECUTPASTE fault from the initial implementation. If
we don't declare the register ID to be KVM_REG_ARM64 the KVM_GET_ONE_REG
implementation kvm_arm_get_reg() returns -EINVAL and hilarity ensues.

The kvm/api.txt document describes all arm64 registers as starting with
0x60xx... (i.e KVM_REG_ARM64).

Signed-off-by: Alex Bennée <alex.bennee@...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: Jiri Slaby <jslaby@...e.cz>
---
 arch/arm64/kvm/sys_regs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 03244582bc55..5ee99e43890a 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -962,7 +962,7 @@ static unsigned int num_demux_regs(void)
 
 static int write_demux_regids(u64 __user *uindices)
 {
-	u64 val = KVM_REG_ARM | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
+	u64 val = KVM_REG_ARM64 | KVM_REG_SIZE_U32 | KVM_REG_ARM_DEMUX;
 	unsigned int i;
 
 	val |= KVM_REG_ARM_DEMUX_ID_CCSIDR;
-- 
2.3.5

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