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| author | Victor Kamensky <victor.kamensky@linaro.org> | 2014-06-12 09:30:08 -0700 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2014-07-11 04:57:41 -0700 |
| commit | b30070862edbdb252f9d0d3a1e61b8dc4c68e3d2 (patch) | |
| tree | e6ee1ef3449c95983ef8753d65f4e455f0140a55 /arch/arm64/include | |
| parent | f5aa462147a209dab40b02f0f70234784b913bf9 (diff) | |
| download | lwn-b30070862edbdb252f9d0d3a1e61b8dc4c68e3d2.tar.gz lwn-b30070862edbdb252f9d0d3a1e61b8dc4c68e3d2.zip | |
ARM64: KVM: MMIO support BE host running LE code
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@linaro.org>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/kvm_emulate.h | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index dd8ecfc3f995..fdc3e21abd8d 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 */ |