blob: 0e340550bc47c30951151e671c2cc346e28b3d3a [file] [log] [blame]
From 8762ea4e263cf4888551991113f1caaa42620199 Mon Sep 17 00:00:00 2001
From: Marc Zyngier <>
Date: Tue, 9 Jun 2020 08:40:35 +0100
Subject: [PATCH] KVM: arm64: Make vcpu_cp1x() work on Big Endian hosts
commit 3204be4109ad681523e3461ce64454c79278450a upstream.
AArch32 CP1x registers are overlayed on their AArch64 counterparts
in the vcpu struct. This leads to an interesting problem as they
are stored in their CPU-local format, and thus a CP1x register
doesn't "hit" the lower 32bit portion of the AArch64 register on
a BE host.
To workaround this unfortunate situation, introduce a bias trick
in the vcpu_cp1x() accessors which picks the correct half of the
64bit register.
Reported-by: James Morse <>
Tested-by: James Morse <>
Acked-by: James Morse <>
Signed-off-by: Marc Zyngier <>
Signed-off-by: Paul Gortmaker <>
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 9f19c354b165..5ecf3ea2ede4 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -392,8 +392,10 @@ void vcpu_write_sys_reg(struct kvm_vcpu *vcpu, u64 val, int reg);
* CP14 and CP15 live in the same array, as they are backed by the
* same system registers.
-#define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r)])
-#define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r)])
+#define vcpu_cp14(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])
+#define vcpu_cp15(v,r) ((v)->arch.ctxt.copro[(r) ^ CPx_BIAS])
struct kvm_vm_stat {
ulong remote_tlb_flush;