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? Thanks. ~ Sid Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879
