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Message-ID: <ZMOJgnyzzUNIx+Tn@google.com>
Date: Fri, 28 Jul 2023 09:25:22 +0000
From: Quentin Perret <qperret@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
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Albert Ou <aou@...s.berkeley.edu>,
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"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFC PATCH v11 06/29] KVM: Introduce KVM_SET_USER_MEMORY_REGION2
On Tuesday 18 Jul 2023 at 16:44:49 (-0700), Sean Christopherson wrote:
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -95,6 +95,16 @@ struct kvm_userspace_memory_region {
> __u64 userspace_addr; /* start of the userspace allocated memory */
> };
>
> +/* for KVM_SET_USER_MEMORY_REGION2 */
> +struct kvm_userspace_memory_region2 {
> + __u32 slot;
> + __u32 flags;
> + __u64 guest_phys_addr;
> + __u64 memory_size;
> + __u64 userspace_addr;
> + __u64 pad[16];
Should we replace that pad[16] with:
__u64 size;
where 'size' is the size of the structure as seen by userspace? This is
used in other UAPIs (see struct sched_attr for example) and is a bit
more robust for future extensions (e.g. an 'old' kernel can correctly
reject a newer version of the struct with additional fields it doesn't
know about if that makes sense, etc).
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