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

[Paolo Bonzini]

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.

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.

Paolo