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Re: [PATCH 1/4] x86/kexec: Stop hooking NMIs with trap_nop()
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 23 Jun 2026 17:51:52 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 23 Jun 2026 16:52:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/03/2026 12:58 pm, Jan Beulich wrote:
> On 24.03.2026 13:50, Andrew Cooper wrote:
>> On 24/03/2026 11:52 am, Jan Beulich wrote:
>>> On 19.03.2026 13:25, Andrew Cooper wrote:
>>>> On x86, we simply cannot free the per-cpu block for any CPU that hasn't
>>>> been
>>>> put back into the wait-for-SIPI state.
>>> Please remind me, is there a reason we can't put CPUs we have offlined (not
>>> parked) into that state?
>> INIT clears CR4.MCE. Any multi-target #MC (even non-fully-broadcast
>> ones) which includes this CPU escalates to SHUTDOWN.
> Wasn't there a difference between AMD and Intel? After all the above is why
> we park Intel CPUs.
Intel is more prone to broadcasts, but AMD is not immune AIUI.
~Andrew
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