[Xen-devel] [PATCH v2 0/2] x86/hvm/viridian: APIC assist

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

This patch series enables use of the 'APIC assist' enlightenment in Xen.

See section 13.3.4.1 of the Microsoft Hypervisor Top Level Function
Specification v4.0b at:

https://msdn.microsoft.com/en-us/virtualization/hyperv_on_windows/develop/tlfs

for more information.

Patch #1 modifies the viridian code to keep the guest APIC assist pages
mapped for the lifetime of the domain (and incorporates a straightforward
data-structure change).

Patch #2 adds a new viridian code and a configuration option to the
toolstack that, when enabled, allows the local APIC emulation to make use
the APIC assist pages.


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