On 24/03/16 05:55, Peter Xu wrote:
> This can be used when probing whether KVM support specific device. Here,
> a raw vmfd is used.
>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Acked-by: Sergey Fedorov <serge.fdrv@xxxxxxxxx>
Kind regards,
Sergey
> ---
> include/sysemu/kvm.h | 9 +++++++++
> kvm-all.c | 15 +++++++++++++++
> 2 files changed, 24 insertions(+)
>
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index 6695fa7..0e18f15 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -306,6 +306,15 @@ void kvm_device_access(int fd, int group, uint64_t attr,
> */
> int kvm_create_device(KVMState *s, uint64_t type, bool test);
>
> +/**
> + * kvm_device_supported - probe whether KVM supports specific device
> + *
> + * @vmfd: The fd handler for VM
> + * @type: type of device
> + *
> + * @return: true if supported, otherwise false.
> + */
> +bool kvm_device_supported(int vmfd, uint64_t type);
>
> /* Arch specific hooks */
>
> diff --git a/kvm-all.c b/kvm-all.c
> index 44c0464..e7b66df 100644
> --- a/kvm-all.c
> +++ b/kvm-all.c
> @@ -2339,6 +2339,21 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test)
> return test ? 0 : create_dev.fd;
> }
>
> +bool kvm_device_supported(int vmfd, uint64_t type)
> +{
> + struct kvm_create_device create_dev = {
> + .type = type,
> + .fd = -1,
> + .flags = KVM_CREATE_DEVICE_TEST,
> + };
> +
> + if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
> + return false;
> + }
> +
> + return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
> +}
> +
> int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
> {
> struct kvm_one_reg reg;
--
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