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libxl_conf: Implement hyperv domain flags for Xen

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Adds support for configuring <hyperv/> flags for domains
running under Xen.

The following flags, making use of QEMU's existing flags, are now
configurable for Xen: vapic, synic, stimer, frequencies, tlbflush and
ipi.

Tests have been added validating translation to libxl's viridian flags

Updated docs section on <hyperv/> flags to note support and to specify
which flags work with Xen.

Signed-off-by: Will <tcosprojects@gmail.com>
Reviewed-by: Jim Fehlig <jfehlig@suse.com>
This commit is contained in:
Will
2025-04-03 15:47:52 -06:00
committed by Jim Fehlig
parent 312088d9b6
commit 410dfde9bb
9 changed files with 601 additions and 11 deletions
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docs/formatdomain.rst
+13 -11
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@@ -2132,32 +2132,34 @@ are:
based virtualization drivers, such as LXC.
``hyperv``
Enable various features improving behavior of guests running Microsoft
Windows.
Windows. :since:`Since 11.3.0` some of these flags are also available for
Xen domains running Microsoft Windows.
=============== ====================================================================== ============================================ ========================================================================
Feature Description Value Since
=============== ====================================================================== ============================================ ========================================================================
relaxed Relax constraints on timers on, off :since:`1.0.0 (QEMU 2.0)`
vapic Enable virtual APIC on, off :since:`1.1.0 (QEMU 2.0)`
relaxed Relax constraints on timers on, off :since:`1.0.0 (QEMU 2.0), 11.3.0 (Xen, always on)`
vapic Enable virtual APIC on, off :since:`1.1.0 (QEMU 2.0), 11.3.0 (Xen)`
spinlocks Enable spinlock support on, off; retries - at least 4095 :since:`1.1.0 (QEMU 2.0)`
vpindex Virtual processor index on, off :since:`1.3.3 (QEMU 2.5)`
vpindex Virtual processor index on, off :since:`1.3.3 (QEMU 2.5), 11.3.0 (Xen, always on)`
runtime Processor time spent on running guest code and on behalf of guest code on, off :since:`1.3.3 (QEMU 2.5)`
synic Enable Synthetic Interrupt Controller (SynIC) on, off :since:`1.3.3 (QEMU 2.6)`
stimer Enable SynIC timers, optionally with Direct Mode support on, off; direct - on,off :since:`1.3.3 (QEMU 2.6), direct mode 5.7.0 (QEMU 4.1)`
synic Enable Synthetic Interrupt Controller (SynIC) on, off :since:`1.3.3 (QEMU 2.6), 11.3.0 (Xen)`
stimer Enable SynIC timers, optionally with Direct Mode support on, off; direct - on,off :since:`1.3.3 (QEMU 2.6), direct mode 5.7.0 (QEMU 4.1), 11.3.0 (Xen, on/off only)`
reset Enable hypervisor reset on, off :since:`1.3.3 (QEMU 2.5)`
vendor_id Set hypervisor vendor id on, off; value - string, up to 12 characters :since:`1.3.3 (QEMU 2.5)`
frequencies Expose frequency MSRs on, off :since:`4.7.0 (QEMU 2.12)`
frequencies Expose frequency MSRs on, off :since:`4.7.0 (QEMU 2.12), 11.3.0 (Xen)`
reenlightenment Enable re-enlightenment notification on migration on, off :since:`4.7.0 (QEMU 3.0)`
tlbflush Enable PV TLB flush support on, off; direct - on,off; extended - on,off :since:`4.7.0 (QEMU 3.0), direct and extended modes 11.0.0 (QEMU 7.1.0)`
ipi Enable PV IPI support on, off :since:`4.10.0 (QEMU 3.1)`
tlbflush Enable PV TLB flush support on, off; direct - on,off; extended - on,off :since:`4.7.0 (QEMU 3.0), direct and extended modes 11.0.0 (QEMU 7.1.0), 11.3.0 (Xen, on/off only)`
ipi Enable PV IPI support on, off :since:`4.10.0 (QEMU 3.1), 11.3.0 (Xen)`
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)`
xmm_input Enable XMM Fast Hypercall Input on, off :since:`10.7.0 (QEMU 7.1)`
=============== ====================================================================== ============================================ ========================================================================
:since:`Since 8.0.0`, the hypervisor can be configured further by setting
the ``mode`` attribute to one of the following values:
:since:`Since 8.0.0 (QEMU) Since 11.3.0 (Xen)`, the hypervisor can be
configured further by setting the ``mode`` attribute to one of the following
values:
``custom``
Set exactly the specified features.