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hyperv: Support hv-emsr-bitmap enlightenment

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qemu supports this enlightenment since version 7.10.

From the qemu commit:
    The newly introduced enlightenment allow L0 (KVM) and L1 (Hyper-V)
    hypervisors to collaborate to avoid unnecessary updates to L2
    MSR-Bitmap upon vmexits.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Tim Wiederhake
2024-08-13 18:51:46 +02:00
parent d543c4e753
commit 0313a500a9
33 changed files with 48 additions and 1 deletions
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docs/formatdomain.rst
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@@ -1989,6 +1989,7 @@ Hypervisors may allow certain CPU / machine features to be toggled on/off.
<tlbflush state='on'/>
<ipi state='on'/>
<evmcs state='on'/>
<emsr_bitmap state='on'/>
</hyperv>
<kvm>
<hidden state='on'/>
@@ -2077,6 +2078,7 @@ are:
ipi Enable PV IPI support on, off :since:`4.10.0 (QEMU 3.1)`
evmcs Enable Enlightened VMCS on, off :since:`4.10.0 (QEMU 3.1)`
avic Enable use Hyper-V SynIC with hardware APICv/AVIC on, off :since:`8.10.0 (QEMU 6.2)`
emsr_bitmap Avoid unnecessary updates to L2 MSR Bitmap upon vmexits. on, off :since:`10.7.0 (QEMU 7.1)`
=============== ====================================================================== ============================================ =======================================================
:since:`Since 8.0.0`, the hypervisor can be configured further by setting