linux-kernel - Re: [RFCv2 15/16] KVM: Unmap protected pages from direct mapping

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Message-ID: <f153ef1a-a758-dec7-b39c-9990aac9d653@redhat.com>
Date:   Tue, 20 Oct 2020 14:18:42 +0200
From:   David Hildenbrand <david@...hat.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Mike Rapoport <rppt@...ux.ibm.com>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Will Drewry <wad@...omium.org>,
        "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        Liran Alon <liran.alon@...cle.com>,
        Mike Rapoport <rppt@...nel.org>, x86@...nel.org,
        kvm@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [RFCv2 15/16] KVM: Unmap protected pages from direct mapping

On 20.10.20 08:18, Kirill A. Shutemov wrote:
> If the protected memory feature enabled, unmap guest memory from
> kernel's direct mappings.

Gah, ugly. I guess this also defeats compaction, swapping, ... oh gosh.
As if all of the encrypted VM implementations didn't bring us enough
ugliness already (SEV extensions also don't support reboots, but can at
least kexec() IIRC).

Something similar is done with secretmem [1]. And people don't seem to
like fragmenting the direct mapping (including me).

[1] https://lkml.kernel.org/r/20200924132904.1391-1-rppt@kernel.org

-- 
Thanks,

David / dhildenb