linux-kernel - Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZDnqbqykWot4+617@google.com>
Date:   Fri, 14 Apr 2023 17:06:06 -0700
From:   Sean Christopherson <seanjc@...gle.com>
To:     Ackerley Tng <ackerleytng@...gle.com>
Cc:     brauner@...nel.org, kirill.shutemov@...ux.intel.com,
        chao.p.peng@...ux.intel.com, hughd@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, qemu-devel@...gnu.org,
        linux-kselftest@...r.kernel.org, pbonzini@...hat.com,
        corbet@....net, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com,
        jlayton@...nel.org, bfields@...ldses.org,
        akpm@...ux-foundation.org, shuah@...nel.org, rppt@...nel.org,
        steven.price@....com, mail@...iej.szmigiero.name, vbabka@...e.cz,
        vannapurve@...gle.com, yu.c.zhang@...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, qperret@...gle.com, michael.roth@....com,
        mhocko@...e.com, songmuchun@...edance.com, pankaj.gupta@....com,
        linux-arch@...r.kernel.org, arnd@...db.de, linmiaohe@...wei.com,
        naoya.horiguchi@....com, tabba@...gle.com, wei.w.wang@...el.com
Subject: Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM
 guest private memory

On Fri, Apr 14, 2023, Sean Christopherson wrote:
> On Fri, Apr 14, 2023, Ackerley Tng wrote:
> > Sean Christopherson <seanjc@...gle.com> writes:
> > > 	if (WARN_ON_ONCE(file->private_data)) {
> > > 		err = -EEXIST;
> > > 		goto err_fd;
> > > 	}
> > 
> > Did you intend this as a check that the backing filesystem isn't using
> > the private_data field in the mapping?
> >
> > I think you meant file->f_mapping->private_data.
> 
> Ya, sounds right.  I should have added disclaimers that (a) I wrote this quite
> quickly and (b) it's compile tested only at this point.

FWIW, here's a very lightly tested version that doesn't explode on a basic selftest.

https://github.com/sean-jc/linux/tree/x86/upm_base_support