On 07/23/2012 06:19 AM, Bharat Bhushan wrote:
> IAC/DAC are defined as 32 bit while they are 64 bit wide. So ONE_REG
> interface is added to set/get them.
>
> Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
> ---
> v2:
> - Using copy_to/from_user() apis.
>
> arch/powerpc/include/asm/kvm.h | 12 ++++++
> arch/powerpc/include/asm/kvm_host.h | 28 ++++++++++++++-
> arch/powerpc/kvm/booke.c | 64 +++++++++++++++++++++++++++++++++-
> arch/powerpc/kvm/booke_emulate.c | 8 ++--
> 4 files changed, 104 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h
> index 1bea4d8..3c14202 100644
> --- a/arch/powerpc/include/asm/kvm.h
> +++ b/arch/powerpc/include/asm/kvm.h
> @@ -221,6 +221,12 @@ struct kvm_sregs {
>
> __u32 dbsr; /* KVM_SREGS_E_UPDATE_DBSR */
> __u32 dbcr[3];
> + /*
> + * iac/dac registers are 64bit wide, while this API
> + * interface provides only lower 32 bits on 64 bit
> + * processors. ONE_REG interface is added for 64bit
> + * iac/dac registers.
> + */
> __u32 iac[4];
> __u32 dac[2];
> __u32 dvc[2];
> @@ -326,5 +332,11 @@ struct kvm_book3e_206_tlb_params {
> };
>
> #define KVM_REG_PPC_HIOR (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x1)
> +#define KVM_REG_PPC_IAC1 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x2)
> +#define KVM_REG_PPC_IAC2 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x3)
> +#define KVM_REG_PPC_IAC3 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x4)
> +#define KVM_REG_PPC_IAC4 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x5)
> +#define KVM_REG_PPC_DAC1 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x6)
> +#define KVM_REG_PPC_DAC2 (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x7)
>
> #endif /* __LINUX_KVM_POWERPC_H */
> diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
> index 43cac48..2c0f015 100644
> --- a/arch/powerpc/include/asm/kvm_host.h
> +++ b/arch/powerpc/include/asm/kvm_host.h
> @@ -342,6 +342,31 @@ struct kvmppc_slb {
> bool class : 1;
> };
>
> +#ifdef CONFIG_BOOKE
> +# ifdef CONFIG_PPC_FSL_BOOK3E
> +#define KVMPPC_IAC_NUM 2
> +#define KVMPPC_DAC_NUM 2
> +# else
> +#define KVMPPC_IAC_NUM 4
> +#define KVMPPC_DAC_NUM 2
> +# endif
> +#define KVMPPC_MAX_IAC 4
> +#define KVMPPC_MAX_DAC 2
> +#endif
> +
> +struct kvmppc_debug_reg {
> +#ifdef CONFIG_BOOKE
> + u32 dbcr0;
> + u32 dbcr1;
> + u32 dbcr2;
> +#ifdef CONFIG_KVM_E500MC
> + u32 dbcr4;
> +#endif
> + u64 iac[KVMPPC_MAX_IAC];
> + u64 dac[KVMPPC_MAX_DAC];
> +#endif
> +};
Is there any reason for this to be a separate struct?
> +
> struct kvm_vcpu_arch {
> ulong host_stack;
> u32 host_pid;
> @@ -436,9 +461,8 @@ struct kvm_vcpu_arch {
>
> u32 ccr0;
> u32 ccr1;
> - u32 dbcr0;
> - u32 dbcr1;
> u32 dbsr;
> + struct kvmppc_debug_reg dbg_reg;
>
> u64 mmcr[3];
> u32 pmc[8];
> diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
> index be71b8e..fa23158 100644
> --- a/arch/powerpc/kvm/booke.c
> +++ b/arch/powerpc/kvm/booke.c
> @@ -1353,12 +1353,72 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
>
> int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
> {
> - return -EINVAL;
> + int r = -EINVAL;
> +
> + switch(reg->id) {
> + case KVM_REG_PPC_IAC1:
> + r = copy_to_user((u64 __user *)(long)reg->addr,
> + &vcpu->arch.dbg_reg.iac[0], sizeof(u64));
> + break;
> + case KVM_REG_PPC_IAC2:
> + r = copy_to_user((u64 __user *)(long)reg->addr,
> + &vcpu->arch.dbg_reg.iac[1], sizeof(u64));
> + break;
> + case KVM_REG_PPC_IAC3:
> + r = copy_to_user((u64 __user *)(long)reg->addr,
> + &vcpu->arch.dbg_reg.iac[2], sizeof(u64));
> + break;
> + case KVM_REG_PPC_IAC4:
> + r = copy_to_user((u64 __user *)(long)reg->addr,
> + &vcpu->arch.dbg_reg.iac[3], sizeof(u64));
> + break;
This will exceed the array size if userspace asks to access IAC3/4 on an
e500-family chip.
Why not just set the array at the max size unconditionally?
-Scott
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