linux-kernel - Re: [PATCH v5 0/7] KVM: selftests: Implement ucall "pool" (for SEV)

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Message-ID: <CAMkAt6ryLh-gQYvmUYfxS3+CRwCLfK3Fby1W5NxxFLSK7M_v0w@mail.gmail.com>
Date:   Fri, 26 Aug 2022 15:32:30 -0600
From:   Peter Gonda <pgonda@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        James Morse <james.morse@....com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Atish Patra <atishp@...shpatra.org>,
        David Hildenbrand <david@...hat.com>,
        Tom Rix <trix@...hat.com>, kvm list <kvm@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        llvm@...ts.linux.dev, LKML <linux-kernel@...r.kernel.org>,
        Colton Lewis <coltonlewis@...gle.com>,
        Andrew Jones <andrew.jones@...ux.dev>
Subject: Re: [PATCH v5 0/7] KVM: selftests: Implement ucall "pool" (for SEV)

On Thu, Aug 25, 2022 at 5:25 PM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Non-KVM folks, y'all got pulled in because of the atomic_test_and_set_bit()
> patch.
>
> Rework the ucall infrastructure to use a pool of ucall structs to pass
> memory instead of using the guest's stack.  For confidential VMs with
> encrypted memory, e.g. SEV, the guest's stack "needs" to be private memory
> and so can't be used to communicate with the host.
>
> Convert all implementations to the pool as all of the complexity is hidden
> in common code, and supporting multiple interfaces adds its own kind of
> complexity.
>
> Tested on x86 and ARM, compile tested on s390 and RISC-V.
>

Thanks for the help on the ucall-pool Sean!

I rebased the SEV selftests on these and everything works as before

TESTED-BY: Peter Gonda <pgonda@...gle.com>