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Commit b3007086 authored by Victor Kamensky's avatar Victor Kamensky Committed by Christoffer Dall
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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: default avatarVictor Kamensky <victor.kamensky@linaro.org>
Reviewed-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent f5aa4621

arch/arm64/include/asm/kvm_emulate.h

+22 −0
Original line number Diff line number Diff line
@@ -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 */