Messages in this thread | | | Date | Tue, 20 Dec 2022 12:38:46 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH] Revert "x86/apic/x2apic: Implement IPI shorthands support" |
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On Tue, Dec 20, 2022 at 01:34:58PM +0800, Baoquan He wrote: > This reverts commit 43931d350f30c6cd8c2f498d54ef7d65750abc92. > > On kvm guest with 4 cpus deployed, when adding 'nr_cpus=2' to normal > kernel's cmdline, and triggering crash to jump to kdump kernel, kdump > kernel will stably hang. Reverting commit 43931d350f30 ("x86/apic/x2apic: > Implement IPI shorthands support") can fix it. > > The problem will disappear if removing 'nr_cpus=2' from normal kerne's > cmdline.
And the root cause for this is... ? Does the kvm x2apic emulation somehow get upset when we shorthand CPUs that haven't been initialized?
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