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SubjectRe: [PATCH v4 0/4] Add support for XMM fast hypercalls
On 06/07/21 17:15, Siddharth Chandrasekaran wrote:
> On Tue, Jul 06, 2021 at 05:04:59PM +0200, Paolo Bonzini wrote:
>> On 30/06/21 13:56, Siddharth Chandrasekaran wrote:
>>> On Wed, May 26, 2021 at 10:56:07AM +0200, Siddharth Chandrasekaran wrote:
>>>> Hyper-V supports the use of XMM registers to perform fast hypercalls.
>>>> This allows guests to take advantage of the improved performance of the
>>>> fast hypercall interface even though a hypercall may require more than
>>>> (the current maximum of) two general purpose registers.
>>>> The XMM fast hypercall interface uses an additional six XMM registers
>>>> (XMM0 to XMM5) to allow the caller to pass an input parameter block of
>>>> up to 112 bytes. Hyper-V can also return data back to the guest in the
>>>> remaining XMM registers that are not used by the current hypercall.
>>>> Although the Hyper-v TLFS mentions that a guest cannot use this feature
>>>> unless the hypervisor advertises support for it, some hypercalls which
>>>> we plan on upstreaming in future uses them anyway. This patchset adds
>>>> necessary infrastructure for handling input/output via XMM registers and
>>>> patches kvm_hv_flush_tlb() to use xmm input arguments.
>>> Hi Paolo,
>>> Are you expecting more reviews on these patches?
>> They are part of 5.14 already. :)
> Ahh, I see them now. I was expecting them to show up in master - that was
> the confusion.

No problem! The patches for the rc period (in your case it was 5.13) go
in master, while yours ended up in next (destined for 5.14).

I usually update master only after 5.14-rc1 is out. In this case I
didn't even have access to kvm.git on the day that Linus pulled your
patches into his tree.


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