Re: [Qemu-devel] [PATCH 1/3] ppc debug stub: Get trap instruction opcode from KVM

[Alexander Graf <agraf@suse.de>]

On 06/10/2014 05:06 PM, Bharat Bhushan wrote:
> Get trap instruction opcode from KVM and this opcode will
> be used for setting software breakpoint in following patch
>
> Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
> ---
>   target-ppc/kvm.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
>
> diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
> index dfa5a26..4fc005f 100644
> --- a/target-ppc/kvm.c
> +++ b/target-ppc/kvm.c
> @@ -71,6 +71,8 @@ static int cap_papr;
>   static int cap_htab_fd;
>   static int cap_fixup_hcalls;
>   
> +static uint32_t debug_inst_opcode;
> +
>   /* XXX We have a race condition where we actually have a level triggered
>    *     interrupt, but the infrastructure can't expose that yet, so the guest
>    *     takes but ignores it, goes to sleep and never gets notified that there's
> @@ -412,6 +414,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
>   {
>       PowerPCCPU *cpu = POWERPC_CPU(cs);
>       CPUPPCState *cenv = &cpu->env;
> +    struct kvm_one_reg reg;
>       int ret;
>   
>       /* Gather server mmu info from KVM and update the CPU state */
> @@ -434,6 +437,14 @@ int kvm_arch_init_vcpu(CPUState *cs)
>           break;
>       }
>   
> +    reg.id = KVM_REG_PPC_DEBUG_INST,
> +    reg.addr = (uintptr_t) &debug_inst_opcode,
> +
> +    ret = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
> +    if (ret) {
> +        return ret;
> +    }

How about kvm_get_one_reg()? :)


Alex