linux-kernel - Re: [PATCH v20 00/17] KVM RISC-V Support

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Message-ID: <mhng-1bfcbce2-3da3-4490-bcc5-45173ad84285@palmerdabbelt-glaptop>
Date:   Mon, 04 Oct 2021 11:01:39 -0700 (PDT)
From:   Palmer Dabbelt <palmerdabbelt@...gle.com>
To:     pbonzini@...hat.com
CC:     Anup Patel <Anup.Patel@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        aou@...s.berkeley.edu, graf@...zon.com,
        Atish Patra <Atish.Patra@....com>,
        Alistair Francis <Alistair.Francis@....com>,
        Damien Le Moal <Damien.LeMoal@....com>, anup@...infault.org,
        kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH v20 00/17] KVM RISC-V Support

On Mon, 04 Oct 2021 01:58:28 PDT (-0700), pbonzini@...hat.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.

Thanks.  I'm assuming "you" there is Anup?

Just to make sure we're on the same page here, I've got

    commit 6c341a285912ddb2894ef793a58ad4f8462f26f4 (HEAD -> for-next)
    Merge: 08da1608a1ca 3f2401f47d29
    Author: Palmer Dabbelt <palmerdabbelt@...gle.com>
    Date:   Mon Oct 4 10:12:44 2021 -0700
    
        Merge tag 'for-riscv' of https://git.kernel.org/pub/scm/virt/kvm/kvm.git into for-next
    
        H extension definitions, shared by the KVM and RISC-V trees.
    
        * tag 'for-riscv' of ssh://gitolite.kernel.org/pub/scm/virt/kvm/kvm: (301 commits)
          RISC-V: Add hypervisor extension related CSR defines
          KVM: selftests: Ensure all migrations are performed when test is affined
          KVM: x86: Swap order of CPUID entry "index" vs. "significant flag" checks
          ptp: Fix ptp_kvm_getcrosststamp issue for x86 ptp_kvm
          x86/kvmclock: Move this_cpu_pvti into kvmclock.h
          KVM: s390: Function documentation fixes
          selftests: KVM: Don't clobber XMM register when read
          KVM: VMX: Fix a TSX_CTRL_CPUID_CLEAR field mask issue
          selftests: KVM: Explicitly use movq to read xmm registers
          selftests: KVM: Call ucall_init when setting up in rseq_test
          KVM: Remove tlbs_dirty
          KVM: X86: Synchronize the shadow pagetable before link it
          KVM: X86: Fix missed remote tlb flush in rmap_write_protect()
          KVM: x86: nSVM: don't copy virt_ext from vmcb12
          KVM: x86: nSVM: test eax for 4K alignment for GP errata workaround
          KVM: x86: selftests: test simultaneous uses of V_IRQ from L1 and L0
          KVM: x86: nSVM: restore int_vector in svm_clear_vintr
          kvm: x86: Add AMD PMU MSRs to msrs_to_save_all[]
          KVM: x86: nVMX: re-evaluate emulation_required on nested VM exit
          KVM: x86: nVMX: don't fail nested VM entry on invalid guest state if !from_vmentry
          ...

into ssh://git@...olite.kernel.org/pub/scm/linux/kernel/git/palmer/linux.git for-next
(I know that's kind of a confusing name, but it's what I've been using 
as my short-term staging branch so I can do all my tests before saying 
"it's on for-next").

If that looks OK I can make it a touch more official by putting into the 
RISC-V tree.

> 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.

Me too ;).

I'm happy to add some KVM-related stuff to my pre-push test set, just 
LMK if there's anything specific I should be looking in to.