Date: Fri, 19 Oct 2018 18:34:38 +0000 From: Colin Percival <cperciva@tarsnap.com> To: "McCarthy, Brian" <Brian.McCarthy@netapp.com>, "freebsd-xen@freebsd.org" <freebsd-xen@freebsd.org> Subject: Re: Bug in XEN support with IPIs? Message-ID: <010001668d9ba04f-4e7c54d1-4b98-46b8-b2bb-4095fd574057-000000@email.amazonses.com> In-Reply-To: <BL0PR06MB4323F3A87ED1752A67849E26E8F90@BL0PR06MB4323.namprd06.prod.outlook.com> References: <BL0PR06MB4323F3A87ED1752A67849E26E8F90@BL0PR06MB4323.namprd06.prod.outlook.com>
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On 10/19/18 9:40 AM, McCarthy, Brian wrote: > it appears, that for FreeBSD XEN guests with SMP support, The IPIs get messed up by intr_shuffle_irqs. The symptom is a smp_ipi_mtx > timeout during TLB shootdown. I've seen this mentioned in e-mails, with the solution (without explanation) being to enable EARLY_AP_STARTUP. > The reason this works in BSD11 is that int_shuffle_irqs is conditionalixed out on EARLY_AP_STARTUP. The real solution seems to be that > xi_cpu and/or ie_cpu should be set. I'm trying to figure out where that would be (for our somewhat modified FreeBSD kernel). Which version are you looking at? We fixed a bug along these lines just about a month ago -- see r338624-338631. -- Colin Percival Security Officer Emeritus, FreeBSD | The power to serve Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoidhelp
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