On Thu, Feb 01, 2018 at 04:15:39PM -0200, Jose Ricardo Ziviani wrote:
> This patch provides the MMIO load/store vector indexed
> X-Form emulation.
>
> Instructions implemented:
> lvx: the quadword in storage addressed by the result of EA &
> 0xffff_ffff_ffff_fff0 is loaded into VRT.
>
> stvx: the contents of VRS are stored into the quadword in storage
> addressed by the result of EA & 0xffff_ffff_ffff_fff0.
>
> Reported-by: Gopesh Kumar Chaudhary <gopchaud@xxxxxxxxxx>
> Reported-by: Balamuruhan S <bala24@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jose Ricardo Ziviani <joserz@xxxxxxxxxxxxxxxxxx>
> ---
> arch/powerpc/include/asm/kvm_host.h | 2 +
> arch/powerpc/include/asm/kvm_ppc.h | 4 +
> arch/powerpc/include/asm/ppc-opcode.h | 6 ++
> arch/powerpc/kvm/emulate_loadstore.c | 34 ++++++++
> arch/powerpc/kvm/powerpc.c | 153 +++++++++++++++++++++++++++++++++-
> 5 files changed, 198 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 3aa5b577cd60..045acc843e98 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -690,6 +690,7 @@ struct kvm_vcpu_arch {
> u8 mmio_vsx_offset;
> u8 mmio_vsx_copy_type;
> u8 mmio_vsx_tx_sx_enabled;
> + u8 mmio_vmx_copy_nums;
> u8 osi_needed;
> u8 osi_enabled;
> u8 papr_enabled;
> @@ -800,6 +801,7 @@ struct kvm_vcpu_arch {
> #define KVM_MMIO_REG_QPR 0x0040
> #define KVM_MMIO_REG_FQPR 0x0060
> #define KVM_MMIO_REG_VSX 0x0080
> +#define KVM_MMIO_REG_VMX 0x00c0
>
> #define __KVM_HAVE_ARCH_WQP
> #define __KVM_HAVE_CREATE_DEVICE
> diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
> index 9db18287b5f4..7765a800ddae 100644
> --- a/arch/powerpc/include/asm/kvm_ppc.h
> +++ b/arch/powerpc/include/asm/kvm_ppc.h
> @@ -81,6 +81,10 @@ extern int kvmppc_handle_loads(struct kvm_run *run, struct kvm_vcpu *vcpu,
> extern int kvmppc_handle_vsx_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
> unsigned int rt, unsigned int bytes,
> int is_default_endian, int mmio_sign_extend);
> +extern int kvmppc_handle_load128_by2x64(struct kvm_run *run,
> + struct kvm_vcpu *vcpu, unsigned int rt, int is_default_endian);
> +extern int kvmppc_handle_store128_by2x64(struct kvm_run *run,
> + struct kvm_vcpu *vcpu, unsigned int rs, int is_default_endian);
> extern int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
> u64 val, unsigned int bytes,
> int is_default_endian);
> diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
> index ab5c1588b487..f1083bcf449c 100644
> --- a/arch/powerpc/include/asm/ppc-opcode.h
> +++ b/arch/powerpc/include/asm/ppc-opcode.h
> @@ -156,6 +156,12 @@
> #define OP_31_XOP_LFDX 599
> #define OP_31_XOP_LFDUX 631
>
> +/* VMX Vector Load Instructions */
> +#define OP_31_XOP_LVX 103
> +
> +/* VMX Vector Store Instructions */
> +#define OP_31_XOP_STVX 231
> +
> #define OP_LWZ 32
> #define OP_STFS 52
> #define OP_STFSU 53
> diff --git a/arch/powerpc/kvm/emulate_loadstore.c b/arch/powerpc/kvm/emulate_loadstore.c
> index af833531af31..332b82eafd48 100644
> --- a/arch/powerpc/kvm/emulate_loadstore.c
> +++ b/arch/powerpc/kvm/emulate_loadstore.c
> @@ -58,6 +58,18 @@ static bool kvmppc_check_vsx_disabled(struct kvm_vcpu *vcpu)
> }
> #endif /* CONFIG_VSX */
>
> +#ifdef CONFIG_ALTIVEC
> +static bool kvmppc_check_altivec_disabled(struct kvm_vcpu *vcpu)
> +{
> + if (!(kvmppc_get_msr(vcpu) & MSR_VEC)) {
> + kvmppc_core_queue_vec_unavail(vcpu);
> + return true;
> + }
> +
> + return false;
> +}
> +#endif /* CONFIG_ALTIVEC */
> +
> /*
> * XXX to do:
> * lfiwax, lfiwzx
> @@ -98,6 +110,7 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
> vcpu->arch.mmio_vsx_copy_type = KVMPPC_VSX_COPY_NONE;
> vcpu->arch.mmio_sp64_extend = 0;
> vcpu->arch.mmio_sign_extend = 0;
> + vcpu->arch.mmio_vmx_copy_nums = 0;
>
> switch (get_op(inst)) {
> case 31:
> @@ -459,6 +472,27 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
> rs, 4, 1);
> break;
> #endif /* CONFIG_VSX */
> +
> +#ifdef CONFIG_ALTIVEC
> + case OP_31_XOP_LVX:
> + if (kvmppc_check_altivec_disabled(vcpu))
> + return EMULATE_DONE;
> + vcpu->arch.vaddr_accessed &= ~0xFULL;
> + vcpu->arch.mmio_vmx_copy_nums = 2;
> + emulated = kvmppc_handle_load128_by2x64(run, vcpu,
> + KVM_MMIO_REG_VMX|rt, 1);
> + break;
> +
> + case OP_31_XOP_STVX:
> + if (kvmppc_check_altivec_disabled(vcpu))
> + return EMULATE_DONE;
> + vcpu->arch.vaddr_accessed &= ~0xFULL;
> + vcpu->arch.mmio_vmx_copy_nums = 2;
> + emulated = kvmppc_handle_store128_by2x64(run, vcpu,
> + rs, 1);
> + break;
> +#endif /* CONFIG_ALTIVEC */
> +
> default:
> emulated = EMULATE_FAIL;
> break;
> diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
> index 1915e86cef6f..a19f42120b38 100644
> --- a/arch/powerpc/kvm/powerpc.c
> +++ b/arch/powerpc/kvm/powerpc.c
> @@ -832,7 +832,7 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
> kvm->arch.kvm_ops->irq_bypass_del_producer(cons, prod);
> }
>
> -#ifdef CONFIG_VSX
> +#ifdef CONFIG_ALTIVEC
> static inline int kvmppc_get_vsr_dword_offset(int index)
> {
> int offset;
> @@ -848,7 +848,9 @@ static inline int kvmppc_get_vsr_dword_offset(int index)
>
> return offset;
> }
> +#endif /* CONFIG_ALTIVEC */
>
> +#ifdef CONFIG_VSX
> static inline int kvmppc_get_vsr_word_offset(int index)
You make the dword version available with ALTIVEC && ~VSX, but in fact
it's the word version that you use below. However, I don't think we
actually want either of them (see below).
> {
> int offset;
> @@ -925,6 +927,31 @@ static inline void kvmppc_set_vsr_word(struct kvm_vcpu *vcpu,
> }
> #endif /* CONFIG_VSX */
>
> +#ifdef CONFIG_ALTIVEC
> +static inline void kvmppc_set_vmx_dword(struct kvm_vcpu *vcpu,
> + u64 gpr)
> +{
> + int index = vcpu->arch.io_gpr & KVM_MMIO_REG_MASK;
> + u32 hi, lo;
> +
> +#ifdef __BIG_ENDIAN
> + hi = gpr >> 32;
> + lo = gpr & 0xffffffff;
> +#else
> + lo = gpr >> 32;
> + hi = gpr & 0xffffffff;
> +#endif
> +
> + if (vcpu->arch.mmio_vmx_copy_nums == 1) {
> + VCPU_VSX_VR(vcpu, index).u[kvmppc_get_vsr_word_offset(2)] = lo;
> + VCPU_VSX_VR(vcpu, index).u[kvmppc_get_vsr_word_offset(3)] = hi;
> + } else if (vcpu->arch.mmio_vmx_copy_nums == 2) {
> + VCPU_VSX_VR(vcpu, index).u[kvmppc_get_vsr_word_offset(0)] = lo;
> + VCPU_VSX_VR(vcpu, index).u[kvmppc_get_vsr_word_offset(1)] = hi;
> + }
Since what we're doing is a 16-byte load, the main thing we have to do
here in handling a cross-endian situation is to swap the two 8-byte
halves. The byte-swapping within each 8-byte half has already been
handled more generically.
I suggest the following code. It is simpler and passes my test case.
static inline void kvmppc_set_vmx_dword(struct kvm_vcpu *vcpu,
u64 gpr)
{
int index = vcpu->arch.io_gpr & KVM_MMIO_REG_MASK;
u32 hi, lo;
u32 di;
#ifdef __BIG_ENDIAN
hi = gpr >> 32;
lo = gpr & 0xffffffff;
#else
lo = gpr >> 32;
hi = gpr & 0xffffffff;
#endif
di = 2 - vcpu->arch.mmio_vmx_copy_nums; /* doubleword index */
if (di > 1)
return;
if (vcpu->arch.mmio_host_swabbed)
di = 1 - di;
VCPU_VSX_VR(vcpu, index).u[di * 2] = hi;
VCPU_VSX_VR(vcpu, index).u[di * 2 + 1] = lo;
}
> +static inline int kvmppc_get_vmx_data(struct kvm_vcpu *vcpu, int rs, u64 *val)
> +{
> + vector128 vrs = VCPU_VSX_VR(vcpu, rs);
> +
> + if (vcpu->arch.mmio_vmx_copy_nums == 1) {
> +#ifdef __BIG_ENDIAN
> + *val = vrs.u[kvmppc_get_vsr_word_offset(3)];
> + *val = (*val << 32) | vrs.u[kvmppc_get_vsr_word_offset(2)];
> +#else
> + *val = vrs.u[kvmppc_get_vsr_word_offset(2)];
> + *val = (*val << 32) | vrs.u[kvmppc_get_vsr_word_offset(3)];
> +#endif
> + return 0;
> + } else if (vcpu->arch.mmio_vmx_copy_nums == 2) {
> +#ifdef __BIG_ENDIAN
> + *val = vrs.u[kvmppc_get_vsr_word_offset(1)];
> + *val = (*val << 32) | vrs.u[kvmppc_get_vsr_word_offset(0)];
> +#else
> + *val = vrs.u[kvmppc_get_vsr_word_offset(0)];
> + *val = (*val << 32) | vrs.u[kvmppc_get_vsr_word_offset(1)];
> +#endif
> + return 0;
> + }
> + return -1;
Once again the main thing is to swap the two halves. My suggested
code is:
static inline int kvmppc_get_vmx_data(struct kvm_vcpu *vcpu, int rs, u64 *val)
{
vector128 vrs = VCPU_VSX_VR(vcpu, rs);
u32 di;
u64 w0, w1;
di = 2 - vcpu->arch.mmio_vmx_copy_nums; /* doubleword index */
if (di > 1)
return -1;
if (vcpu->arch.mmio_host_swabbed)
di = 1 - di;
w0 = vrs.u[di * 2];
w1 = vrs.u[di * 2 + 1];
#ifdef __BIG_ENDIAN
*val = (w0 << 32) | w1;
#else
*val = (w1 << 32) | w0;
#endif
return 0;
}
Paul.
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