David Woodhouse a3ec54b95c x86/apic: Fix x2apic enablement without interrupt remapping ... [ Upstream commit 26573a9774 ] Currently, Linux as a hypervisor guest will enable x2apic only if there are no CPUs present at boot time with an APIC ID above 255. Hotplugging a CPU later with a higher APIC ID would result in a CPU which cannot be targeted by external interrupts. Add a filter in x2apic_apic_id_valid() which can be used to prevent such CPUs from coming online, and allow x2apic to be enabled even if they are present at boot time. Fixes: ce69a78450 ("x86/apic: Enable x2APIC without interrupt remapping under KVM") Signed-off-by: David Woodhouse <dwmw@amazon.co.uk> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lore.kernel.org/r/20201024213535.443185-2-dwmw2@infradead.org Signed-off-by: Sasha Levin <sashal@kernel.org>		2020-12-30 11:51:03 +01:00
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include	x86/apic: Fix x2apic enablement without interrupt remapping	2020-12-30 11:51:03 +01:00
kernel	x86/apic: Fix x2apic enablement without interrupt remapping	2020-12-30 11:51:03 +01:00
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