From mboxrd@z Thu Jan 1 00:00:00 1970 From: victor.kamensky@linaro.org (Victor Kamensky) Date: Thu, 12 Jun 2014 09:30:08 -0700 Subject: [PATCH v4 09/14] ARM64: KVM: MMIO support BE host running LE code In-Reply-To: <1402590613-3341-1-git-send-email-victor.kamensky@linaro.org> References: <1402590613-3341-1-git-send-email-victor.kamensky@linaro.org> Message-ID: <1402590613-3341-10-git-send-email-victor.kamensky@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Reviewed-by: Christoffer Dall Reviewed-by: Marc Zyngier --- 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