x86/acrn: Allow ACRN guest to use X2APIC mode

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The ACRN Hypervisor did not support x2APIC and thus x2APIC support was
disabled by always returning false when VM checked for x2APIC support.

ACRN received full support of x2APIC and exports the capability through
CPUID feature bits.

Let VM decide if it needs to switch to x2APIC mode according to CPUID
features.

Originally-by: Yakui Zhao <yakui.zhao@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/20200806113802.9325-1-shuo.a.liu@intel.com

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Shuo Liu 2020-08-06 19:38:02 +08:00 • committed by Ingo Molnar

parent 7b4ea9456d

commit 86d709ce30

1 changed files with 2 additions and 6 deletions

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arch/x86/kernel/cpu/acrn.c

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