[PATCH 1/5] ARM64: KVM: MMIO support BE host running LE code
Victor Kamensky
victor.kamensky at linaro.org
Wed Feb 12 00:57:19 EST 2014
In case of guest CPU running in LE mode and host runs in
BE mode we need byteswap data, so read/write is emulated correctly.
Signed-off-by: Victor Kamensky <victor.kamensky at linaro.org>
---
arch/arm64/include/asm/kvm_emulate.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index dd8ecfc..fdc3e21 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -213,6 +213,17 @@ static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
default:
return be64_to_cpu(data);
}
+ } else {
+ switch (len) {
+ case 1:
+ return data & 0xff;
+ case 2:
+ return le16_to_cpu(data & 0xffff);
+ case 4:
+ return le32_to_cpu(data & 0xffffffff);
+ default:
+ return le64_to_cpu(data);
+ }
}
return data; /* Leave LE untouched */
@@ -233,6 +244,17 @@ static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
default:
return cpu_to_be64(data);
}
+ } else {
+ switch (len) {
+ case 1:
+ return data & 0xff;
+ case 2:
+ return cpu_to_le16(data & 0xffff);
+ case 4:
+ return cpu_to_le32(data & 0xffffffff);
+ default:
+ return cpu_to_le64(data);
+ }
}
return data; /* Leave LE untouched */
--
1.8.1.4
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