From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: ARM Generic Timer interrupt Date: Tue, 27 May 2014 17:12:55 +0100 Message-ID: <5384B987.1060200@linaro.org> References: <5384A88F.4090401@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Stefano Stabellini Cc: Oleksandr Tyshchenko , Ian Campbell , "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org On 05/27/2014 05:05 PM, Stefano Stabellini wrote: > On Tue, 27 May 2014, Julien Grall wrote: >> On 05/27/2014 01:11 PM, Stefano Stabellini wrote: >>> Given that 1) didn't sound right to me, I tried 2) first but I had >>> issues with the ARM emulator at the time. And as an ulterior >>> confirmation that deactivating it is not how ARM thought that the vtimer >>> should be used, Linux and KVM do 1) too. >> >> I suspect you had issue on the emulator because VCPU can EOI the timer >> IRQ on another CPU. >> >> If so, you will disable the vtimer interrupt forever on this CPU. > > I don't think so (unless the vcpu is migrated). > Keep in mind that the vtimer is a PPI. Sorry, I meant during VCPU migration. Regards, -- Julien Grall