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i386: Hyper-V XMM fast hypercall input feature

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Hyper-V specification allows to pass parameters for certain hypercalls
using XMM registers ("XMM Fast Hypercall Input"). When the feature is
in use, it allows for faster hypercalls processing as KVM can avoid
reading guest's memory.

KVM supports the feature since v5.14.

Rename HV_HYPERCALL_{PARAMS_XMM_AVAILABLE -> XMM_INPUT_AVAILABLE} to
comply with KVM.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220525115949.1294004-4-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-05-25 13:59:46 +02:00 • committed by Paolo Bonzini
parent 869840d26c
commit 9411e8b6fa
5 changed files with 17 additions and 1 deletions
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6
docs/hyperv.txt
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@ -249,6 +249,12 @@ Enlightened VMCS ('hv-evmcs') feature to also be enabled.
Recommended: hv-evmcs (Intel)
3.23. hv-xmm-input
===================
Hyper-V specification allows to pass parameters for certain hypercalls using XMM
registers ("XMM Fast Hypercall Input"). When the feature is in use, it allows
for faster hypercalls processing as KVM can avoid reading guest's memory.
4. Supplementary features
=========================