Re: [Qemu-arm] [RFC v4 02/16] linux-headers: header update for KVM/ARM KVM_ARM_GET_MAX_VM_PHYS_SHIFT

[Suzuki K Poulose]

Hi Eric,

On 10/18/2018 03:30 PM, Eric Auger wrote:
> This is a header update against kvmarm next branch
>
> git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm kvmarm/next
>
> to get the KVM_ARM_GET_MAX_VM_PHYS_SHIFT ioctl. This allows to retrieve
> the IPA address range KVM supports.
>
> Signed-off-by: Eric Auger <address@hidden>
>
> ---
>
> v3 -> v4:
> - update against kvmarm next
> ---
>   linux-headers/linux/kvm.h | 10 ++++++++++
>   1 file changed, 10 insertions(+)
>
> diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
> index 83ba4eb571..9647ce4fcb 100644
> --- a/linux-headers/linux/kvm.h
> +++ b/linux-headers/linux/kvm.h
> @@ -750,6 +750,15 @@ struct kvm_ppc_resize_hpt {
>   
>   #define KVM_S390_SIE_PAGE_OFFSET 1
>   
> +/*
> + * On arm64, machine type can be used to request the physical
> + * address size for the VM. Bits[7-0] are reserved for the guest
> + * PA size shift (i.e, log2(PA_Size)). For backward compatibility,
> + * value 0 implies the default IPA size, 40bits.
> + */
> +#define KVM_VM_TYPE_ARM_IPA_SIZE_MASK  0xffULL
> +#define KVM_VM_TYPE_ARM_IPA_SIZE(x)            \
> +       ((x) & KVM_VM_TYPE_ARM_IPA_SIZE_MASK)
>   /*
>    * ioctls for /dev/kvm fds:
>    */
> @@ -953,6 +962,7 @@ struct kvm_ppc_resize_hpt {
>   #define KVM_CAP_NESTED_STATE 157
>   #define KVM_CAP_ARM_INJECT_SERROR_ESR 158
>   #define KVM_CAP_MSR_PLATFORM_INFO 159
> +#define KVM_CAP_ARM_VM_IPA_SIZE 160 /* returns maximum IPA bits for a VM */

Please be aware that there have been multiple merge conflicts with
the kvmarm-tree onto kvm tree upstream and the numbers have changed.
I assume that you will be rebasing this to mainline anyways.

Cheers
Suzuki