From mboxrd@z Thu Jan 1 00:00:00 1970 From: christoffer.dall@linaro.org (Christoffer Dall) Date: Wed, 19 Mar 2014 20:41:15 -0700 Subject: [PATCH 1/5] ARM64: KVM: MMIO support BE host running LE code In-Reply-To: <1392184643-6108-2-git-send-email-victor.kamensky@linaro.org> References: <1392184643-6108-1-git-send-email-victor.kamensky@linaro.org> <1392184643-6108-2-git-send-email-victor.kamensky@linaro.org> Message-ID: <20140320034115.GQ1297@cbox> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, Feb 11, 2014 at 09:57:19PM -0800, Victor Kamensky wrote: > 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 > --- > 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 > Again, given the ABI merge: Reviewed-by: Christoffer Dall