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Message-ID: <87r0oimv7w.ffs@tglx>
Date: Fri, 04 Aug 2023 22:02:59 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Borislav Petkov <bp@...en8.de>
Cc: LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
Tom Lendacky <thomas.lendacky@....com>,
Andrew Cooper <andrew.cooper3@...rix.com>,
Arjan van de Ven <arjan@...ux.intel.com>,
Huang Rui <ray.huang@....com>, Juergen Gross <jgross@...e.com>,
Dimitri Sivanich <dimitri.sivanich@....com>,
Michael Kelley <mikelley@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>
Subject: Re: [patch V3 02/40] x86/apic: Fake primary thread mask for XEN/PV
On Fri, Aug 04 2023 at 20:12, Borislav Petkov wrote:
>> @@ -2344,6 +2346,15 @@ static int __init smp_init_primary_threa
>> {
>> unsigned int cpu;
>>
>> + /*
>> + * XEN/PV provides either none or useless topology information.
>> + * Pretend that all vCPUs are primary threads.
>> + */
>> + if (xen_pv_domain()) {
>> + cpumask_copy(&__cpu_primary_thread_mask, cpu_possible_mask);
>> + return 0;
>> + }
>
> Can this be somewhere in the Xen init code instead?
Not for now. That's all going away with the 3rd installment. But right
now it's the right place to be.
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