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. ~ Sid. v2: - Add hc.fast to is_xmm_fast_hypercall() check - Split CPUID feature bits for input and output Siddharth Chandrasekaran (4): KVM: x86: Move FPU register accessors into fpu.h KVM: hyper-v: Collect hypercall params into struct KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers KVM: hyper-v: Advertise support for fast XMM hypercalls arch/x86/include/asm/hyperv-tlfs.h | 7 +- arch/x86/kvm/emulate.c | 138 +++------------- arch/x86/kvm/fpu.h | 140 +++++++++++++++++ arch/x86/kvm/hyperv.c | 242 +++++++++++++++++++---------- 4 files changed, 327 insertions(+), 200 deletions(-) create mode 100644 arch/x86/kvm/fpu.h -- 2.17.1 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
