arm/arm64: KVM: MMIO support for BE guest

Do the necessary byteswap when host and guest have different
views of the universe. Actually, the only case we need to take
care of is when the guest is BE. All the other cases are naturally
handled.

Also be careful about endianness when the data is being memcopy-ed
from/to the run buffer.

Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

3 files changed, 164 insertions, 11 deletions

diff --git a/arch/arm/include/asm/kvm_emulate.h b/arch/arm/include/asm/kvm_emulate.h
index a464e8d7b6c5..8a6be05a46d7 100644
--- a/arch/arm/include/asm/kvm_emulate.h
+++ b/arch/arm/include/asm/kvm_emulate.h
@@ -157,4 +157,45 @@ static inline u32 kvm_vcpu_hvc_get_imm(struct kvm_vcpu *vcpu)
         return kvm_vcpu_get_hsr(vcpu) & HSR_HVC_IMM_MASK;
 }
 
+static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
+{
+        return !!(*vcpu_cpsr(vcpu) & PSR_E_BIT);
+}
+
+static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
+                                                    unsigned long data,
+                                                    unsigned int len)
+{
+        if (kvm_vcpu_is_be(vcpu)) {
+                switch (len) {
+                case 1:
+                        return data & 0xff;
+                case 2:
+                        return be16_to_cpu(data & 0xffff);
+                default:
+                        return be32_to_cpu(data);
+                }
+        }
+
+        return data;            /* Leave LE untouched */
+}
+
+static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
+                                                    unsigned long data,
+                                                    unsigned int len)
+{
+        if (kvm_vcpu_is_be(vcpu)) {
+                switch (len) {
+                case 1:
+                        return data & 0xff;
+                case 2:
+                        return cpu_to_be16(data & 0xffff);
+                default:
+                        return cpu_to_be32(data);
+                }
+        }
+
+        return data;            /* Leave LE untouched */
+}
+
 #endif /* __ARM_KVM_EMULATE_H__ */
diff --git a/arch/arm/kvm/mmio.c b/arch/arm/kvm/mmio.c
index 0c25d9487d53..4cb5a93182e9 100644
--- a/arch/arm/kvm/mmio.c
+++ b/arch/arm/kvm/mmio.c
@@ -23,6 +23,68 @@
 
 #include "trace.h"
 
+static void mmio_write_buf(char *buf, unsigned int len, unsigned long data)
+{
+        void *datap = NULL;
+        union {
+                u8      byte;
+                u16     hword;
+                u32     word;
+                u64     dword;
+        } tmp;
+
+        switch (len) {
+        case 1:
+                tmp.byte        = data;
+                datap           = &tmp.byte;
+                break;
+        case 2:
+                tmp.hword       = data;
+                datap           = &tmp.hword;
+                break;
+        case 4:
+                tmp.word        = data;
+                datap           = &tmp.word;
+                break;
+        case 8:
+                tmp.dword       = data;
+                datap           = &tmp.dword;
+                break;
+        }
+
+        memcpy(buf, datap, len);
+}
+
+static unsigned long mmio_read_buf(char *buf, unsigned int len)
+{
+        unsigned long data = 0;
+        union {
+                u16     hword;
+                u32     word;
+                u64     dword;
+        } tmp;
+
+        switch (len) {
+        case 1:
+                data = buf[0];
+                break;
+        case 2:
+                memcpy(&tmp.hword, buf, len);
+                data = tmp.hword;
+                break;
+        case 4:
+                memcpy(&tmp.word, buf, len);
+                data = tmp.word;
+                break;
+        case 8:
+                memcpy(&tmp.dword, buf, len);
+                data = tmp.dword;
+                break;
+        }
+
+        return data;
+}
+
 /**
  * kvm_handle_mmio_return -- Handle MMIO loads after user space emulation
  * @vcpu: The VCPU pointer
@@ -33,28 +95,27 @@
  */
 int kvm_handle_mmio_return(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
-        unsigned long *dest;
+        unsigned long data;
         unsigned int len;
         int mask;
 
         if (!run->mmio.is_write) {
-                dest = vcpu_reg(vcpu, vcpu->arch.mmio_decode.rt);
-                *dest = 0;
-
                 len = run->mmio.len;
                 if (len > sizeof(unsigned long))
                         return -EINVAL;
 
-                memcpy(dest, run->mmio.data, len);
-
-                trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
-                                *((u64 *)run->mmio.data));
+                data = mmio_read_buf(run->mmio.data, len);
 
                 if (vcpu->arch.mmio_decode.sign_extend &&
                     len < sizeof(unsigned long)) {
                         mask = 1U << ((len * 8) - 1);
-                        *dest = (*dest ^ mask) - mask;
+                        data = (data ^ mask) - mask;
                 }
+
+                trace_kvm_mmio(KVM_TRACE_MMIO_READ, len, run->mmio.phys_addr,
+                               data);
+                data = vcpu_data_host_to_guest(vcpu, data, len);
+                *vcpu_reg(vcpu, vcpu->arch.mmio_decode.rt) = data;
         }
 
         return 0;
@@ -105,6 +166,7 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
                  phys_addr_t fault_ipa)
 {
         struct kvm_exit_mmio mmio;
+        unsigned long data;
         unsigned long rt;
         int ret;
 
@@ -125,13 +187,15 @@ int io_mem_abort(struct kvm_vcpu *vcpu, struct kvm_run *run,
         }
 
         rt = vcpu->arch.mmio_decode.rt;
+        data = vcpu_data_guest_to_host(vcpu, *vcpu_reg(vcpu, rt), mmio.len);
+
         trace_kvm_mmio((mmio.is_write) ? KVM_TRACE_MMIO_WRITE :
                                          KVM_TRACE_MMIO_READ_UNSATISFIED,
                         mmio.len, fault_ipa,
-                        (mmio.is_write) ? *vcpu_reg(vcpu, rt) : 0);
+                        (mmio.is_write) ? data : 0);
 
         if (mmio.is_write)
-                memcpy(mmio.data, vcpu_reg(vcpu, rt), mmio.len);
+                mmio_write_buf(mmio.data, mmio.len, data);
 
         if (vgic_handle_mmio(vcpu, run, &mmio))
                 return 1;
diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index eec073875218..b016577e37a4 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -177,4 +177,52 @@ static inline u8 kvm_vcpu_trap_get_fault(const struct kvm_vcpu *vcpu)
         return kvm_vcpu_get_hsr(vcpu) & ESR_EL2_FSC_TYPE;
 }
 
+static inline bool kvm_vcpu_is_be(struct kvm_vcpu *vcpu)
+{
+        if (vcpu_mode_is_32bit(vcpu))
+                return !!(*vcpu_cpsr(vcpu) & COMPAT_PSR_E_BIT);
+
+        return !!(vcpu_sys_reg(vcpu, SCTLR_EL1) & (1 << 25));
+}
+
+static inline unsigned long vcpu_data_guest_to_host(struct kvm_vcpu *vcpu,
+                                                    unsigned long data,
+                                                    unsigned int len)
+{
+        if (kvm_vcpu_is_be(vcpu)) {
+                switch (len) {
+                case 1:
+                        return data & 0xff;
+                case 2:
+                        return be16_to_cpu(data & 0xffff);
+                case 4:
+                        return be32_to_cpu(data & 0xffffffff);
+                default:
+                        return be64_to_cpu(data);
+                }
+        }
+
+        return data;            /* Leave LE untouched */
+}
+
+static inline unsigned long vcpu_data_host_to_guest(struct kvm_vcpu *vcpu,
+                                                    unsigned long data,
+                                                    unsigned int len)
+{
+        if (kvm_vcpu_is_be(vcpu)) {
+                switch (len) {
+                case 1:
+                        return data & 0xff;
+                case 2:
+                        return cpu_to_be16(data & 0xffff);
+                case 4:
+                        return cpu_to_be32(data & 0xffffffff);
+                default:
+                        return cpu_to_be64(data);
+                }
+        }
+
+        return data;            /* Leave LE untouched */
+}
+
 #endif /* __ARM64_KVM_EMULATE_H__ */