linux-kernel - Re: [PATCH RFC v7 02/64] KVM: x86: Add KVM_CAP_UNMAPPED_PRIVATE

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Message-ID: <Y6RM8RRryLgK8KiB@zn.tnic>
Date:   Thu, 22 Dec 2022 13:26:25 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Michael Roth <michael.roth@....com>
Cc:     kvm@...r.kernel.org, linux-coco@...ts.linux.dev,
        linux-mm@...ck.org, linux-crypto@...r.kernel.org, x86@...nel.org,
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        ashish.kalra@....com, harald@...fian.com
Subject: Re: [PATCH RFC v7 02/64] KVM: x86: Add
 KVM_CAP_UNMAPPED_PRIVATE_MEMORY

On Wed, Dec 14, 2022 at 01:39:54PM -0600, Michael Roth wrote:
> This mainly indicates to KVM that it should expect all private guest
> memory to be backed by private memslots. Ideally this would work
> similarly for others archs, give or take a few additional flags, but
> for now it's a simple boolean indicator for x86.

...

> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index c7e9d375a902..cc9424ccf9b2 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -1219,6 +1219,7 @@ struct kvm_ppc_resize_hpt {
>  #define KVM_CAP_DIRTY_LOG_RING_ACQ_REL 223
>  #define KVM_CAP_S390_PROTECTED_ASYNC_DISABLE 224
>  #define KVM_CAP_MEMORY_ATTRIBUTES 225
> +#define KVM_CAP_UNMAPPED_PRIVATE_MEM 240

Isn't this new cap supposed to be documented somewhere in
Documentation/virt/kvm/api.rst ?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette