linux-kernel - Re: [PATCH v10 3/9] KVM: Extend the memslot to support fd-based private memory

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Date:   Tue, 20 Dec 2022 15:43:18 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, qemu-devel@...gnu.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Miaohe Lin <linmiaohe@...wei.com>, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Steven Price <steven.price@....com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, jun.nakajima@...el.com, dave.hansen@...el.com,
        ak@...ux.intel.com, david@...hat.com, aarcange@...hat.com,
        ddutile@...hat.com, dhildenb@...hat.com,
        Quentin Perret <qperret@...gle.com>, tabba@...gle.com,
        Michael Roth <michael.roth@....com>, mhocko@...e.com,
        wei.w.wang@...el.com
Subject: Re: [PATCH v10 3/9] KVM: Extend the memslot to support fd-based
 private memory

On Mon, Dec 19, 2022 at 03:36:28PM +0100, Borislav Petkov wrote:
> On Fri, Dec 02, 2022 at 02:13:41PM +0800, Chao Peng wrote:
> > In memory encryption usage, guest memory may be encrypted with special
> > key and can be accessed only by the guest itself. We call such memory
> > private memory. It's valueless and sometimes can cause problem to allow
> 
> valueless?
> 
> I can't parse that.

It's unnecessary and ...

> 
> > userspace to access guest private memory. This new KVM memslot extension
> > allows guest private memory being provided through a restrictedmem
> > backed file descriptor(fd) and userspace is restricted to access the
> > bookmarked memory in the fd.
> 
> bookmarked?

userspace is restricted to access the memory content in the fd.

> 
> > This new extension, indicated by the new flag KVM_MEM_PRIVATE, adds two
> > additional KVM memslot fields restricted_fd/restricted_offset to allow
> > userspace to instruct KVM to provide guest memory through restricted_fd.
> > 'guest_phys_addr' is mapped at the restricted_offset of restricted_fd
> > and the size is 'memory_size'.
> > 
> > The extended memslot can still have the userspace_addr(hva). When use, a
> 
> "When un use, ..."

When both userspace_addr and restricted_fd/offset were used, ...

> 
> ...
> 
> > diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
> > index a8e379a3afee..690cb21010e7 100644
> > --- a/arch/x86/kvm/Kconfig
> > +++ b/arch/x86/kvm/Kconfig
> > @@ -50,6 +50,8 @@ config KVM
> >  	select INTERVAL_TREE
> >  	select HAVE_KVM_PM_NOTIFIER if PM
> >  	select HAVE_KVM_MEMORY_ATTRIBUTES
> > +	select HAVE_KVM_RESTRICTED_MEM if X86_64
> > +	select RESTRICTEDMEM if HAVE_KVM_RESTRICTED_MEM
> 
> Those deps here look weird.
> 
> RESTRICTEDMEM should be selected by TDX_GUEST as it can't live without
> it.

RESTRICTEDMEM is needed by TDX_HOST, not TDX_GUEST.

> 
> Then you don't have to select HAVE_KVM_RESTRICTED_MEM simply because of
> X86_64 - you need that functionality when the respective guest support
> is enabled in KVM.

Letting the actual feature(e.g. TDX or pKVM) select it or add dependency
sounds a viable and clearer solution. Sean, let me know your opinion.

> 
> Then, looking forward into your patchset, I'm not sure you even
> need HAVE_KVM_RESTRICTED_MEM - you could make it all depend on
> CONFIG_RESTRICTEDMEM. But that's KVM folks call - I'd always aim for
> less Kconfig items because we have waay too many.

The only reason to add another HAVE_KVM_RESTRICTED_MEM is some code only
works for 64bit[*] and CONFIG_RESTRICTEDMEM is not sufficient to enforce
that.

[*] https://lore.kernel.org/all/YkJLFu98hZOvTSrL@google.com/

Thanks,
Chao
> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette