xen/x86: detect support for extended destination ID

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Xen allows the usage of some previously reserved bits in the IO-APIC
RTE and the MSI address fields in order to store high bits for the
target APIC ID. Such feature is already implemented by QEMU/KVM and
HyperV, so in order to enable it just add the handler that checks for
it's presence.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20220120152527.7524-3-roger.pau@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>

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Roger Pau Monne 2022-01-20 16:25:27 +01:00 • committed by Juergen Gross

parent f34c4f2dd2

commit e07e98da92

2 changed files with 13 additions and 0 deletions

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7

arch/x86/include/asm/xen/cpuid.h

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6

arch/x86/xen/enlighten_hvm.c

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