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From:   Anup Patel <anup@brainfault.org>
Date:   Tue, 5 Oct 2021 09:47:46 +0530
Message-ID: <CAAhSdy2b-xHSQYhypo9=87mrf82B3Faficc6utW6E6XcYqV=JQ@mail.gmail.com>
Subject: Re: [PATCH v20 00/17] KVM RISC-V Support
To:     Paolo Bonzini <pbonzini@redhat.com>
Cc:     Anup Patel <anup.patel@wdc.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Palmer Dabbelt <palmerdabbelt@google.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Alexander Graf <graf@amazon.com>,
        Atish Patra <atish.patra@wdc.com>,
        Alistair Francis <Alistair.Francis@wdc.com>,
        Damien Le Moal <damien.lemoal@wdc.com>,
        KVM General <kvm@vger.kernel.org>,
        kvm-riscv@lists.infradead.org,
        linux-riscv <linux-riscv@lists.infradead.org>,
        "linux-kernel@vger.kernel.org List" <linux-kernel@vger.kernel.org>
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On Mon, Oct 4, 2021 at 2:28 PM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 27/09/21 13:39, Anup Patel wrote:
> > This series adds initial KVM RISC-V support. Currently, we are able to boot
> > Linux on RV64/RV32 Guest with multiple VCPUs.
> >
> > Key aspects of KVM RISC-V added by this series are:
> > 1. No RISC-V specific KVM IOCTL
> > 2. Loadable KVM RISC-V module supported
> > 3. Minimal possible KVM world-switch which touches only GPRs and few CSRs
> > 4. Both RV64 and RV32 host supported
> > 5. Full Guest/VM switch is done via vcpu_get/vcpu_put infrastructure
> > 6. KVM ONE_REG interface for VCPU register access from user-space
> > 7. PLIC emulation is done in user-space
> > 8. Timer and IPI emuation is done in-kernel
> > 9. Both Sv39x4 and Sv48x4 supported for RV64 host
> > 10. MMU notifiers supported
> > 11. Generic dirtylog supported
> > 12. FP lazy save/restore supported
> > 13. SBI v0.1 emulation for KVM Guest available
> > 14. Forward unhandled SBI calls to KVM userspace
> > 15. Hugepage support for Guest/VM
> > 16. IOEVENTFD support for Vhost
> >
> > Here's a brief TODO list which we will work upon after this series:
> > 1. KVM unit test support
> > 2. KVM selftest support
> > 3. SBI v0.3 emulation in-kernel
> > 4. In-kernel PMU virtualization
> > 5. In-kernel AIA irqchip support
> > 6. Nested virtualizaiton
> > 7. ..... and more .....
>
> Looks good, I prepared a tag "for-riscv" at
> https://git.kernel.org/pub/scm/virt/kvm/kvm.git.  Palmer can pull it and
> you can use it to send me a pull request.

Sure, I have prepared PR for the remaining 16 patches based on the
PATCH1 commit in the KVM tree.

I will send PR today or tomorrow.

>
> I look forward to the test support. :)  Would be nice to have selftest
> support already in 5.16, since there are a few arch-independent
> selftests that cover the hairy parts of the MMU.

I will try my best to send basic kvm-selftest support sooner (preferably
for 5.16).

Regards,
Anup