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| author | Siddharth Chandrasekaran <sidcha@amazon.de> | 2021-05-26 10:56:10 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-06-17 13:09:24 -0400 |
| commit | 5974565bc26d6a599189db7c0b1f79eaa9af8eb9 (patch) | |
| tree | 1e6bc72e1a8dabf71aac3e2ef8e548190b193c6e /arch/x86/include/asm/hyperv-tlfs.h | |
| parent | bd38b32053eb1c53ddb7030cf0fc6d700f7f1d82 (diff) | |
| download | linux-stable-5974565bc26d6a599189db7c0b1f79eaa9af8eb9.tar.gz linux-stable-5974565bc26d6a599189db7c0b1f79eaa9af8eb9.tar.bz2 linux-stable-5974565bc26d6a599189db7c0b1f79eaa9af8eb9.zip | |
KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers
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 input registers.
The XMM fast hypercall interface uses six additional XMM registers (XMM0
to XMM5) to allow the guest to pass an input parameter block of up to
112 bytes.
Add framework to read from XMM registers in kvm_hv_hypercall() and use
the additional hypercall inputs from XMM registers in kvm_hv_flush_tlb()
when possible.
Cc: Alexander Graf <graf@amazon.com>
Co-developed-by: Evgeny Iakovlev <eyakovl@amazon.de>
Signed-off-by: Evgeny Iakovlev <eyakovl@amazon.de>
Signed-off-by: Siddharth Chandrasekaran <sidcha@amazon.de>
Message-Id: <fc62edad33f1920fe5c74dde47d7d0b4275a9012.1622019134.git.sidcha@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/include/asm/hyperv-tlfs.h')
| -rw-r--r-- | arch/x86/include/asm/hyperv-tlfs.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h index 606f5cc579b2..27a9f08e8386 100644 --- a/arch/x86/include/asm/hyperv-tlfs.h +++ b/arch/x86/include/asm/hyperv-tlfs.h @@ -314,6 +314,9 @@ struct hv_tsc_emulation_status { #define HV_X64_MSR_TSC_REFERENCE_ENABLE 0x00000001 #define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT 12 +/* Number of XMM registers used in hypercall input/output */ +#define HV_HYPERCALL_MAX_XMM_REGISTERS 6 + struct hv_nested_enlightenments_control { struct { __u32 directhypercall:1; |