[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v11 5/5] xen/arm: account for stolen ticks
Mark Rutland <mark.rutland@xxxxxxx> writes: > On Fri, Nov 06, 2015 at 11:41:49AM +0000, David Vrabel wrote: >> On 06/11/15 11:39, Stefano Stabellini wrote: >> > On Thu, 5 Nov 2015, Mark Rutland wrote: >> >>> static void xen_percpu_init(void) >> >>> { >> >>> struct vcpu_register_vcpu_info info; >> >>> @@ -104,6 +120,8 @@ static void xen_percpu_init(void) >> >>> BUG_ON(err); >> >>> per_cpu(xen_vcpu, cpu) = vcpup; >> >>> >> >>> + xen_setup_runstate_info(cpu); >> >> >> >> Does the runstate memory area get unregsitered when a kernel tears >> >> things down, or is kexec somehow inhibited for xen guests? >> >> >> >> i couldn't spot either happening, but I may have missed it. >> > >> > I don't think that the runstate memory area needs to be unregistered for >> > kexec, but I am not very knowledgeble on kexec and Xen, CC'ing Vitaly >> > and David. >> >> There's a whole pile of other state needing to be reset for kexec (event >> channels and grant tables for example). The guest needs to soft reset >> itself (available in Xen 4.6) before kexec'ing another kernel. >> >> This soft reset would also including cleaning up this shared memory region. > > Ok. So we don't currently have the code kernel-side, but it looks like > it would be relatively simple to add (having just spotted [1]) already merged in 4.3 and several stable trees. > , and everything should be ready on the Xen side.` > Yes, but for x86 only. arch_domain_soft_reset() is -ENOSYS for ARM now. It should be relatively easy to implement, one should unmap shared_info page and do some GIC cleanup (if it's needed at all). I'd be happy to help if someone's interested but unfortunately I don't have ARM hardware to test at this moment... > Thanks, > Mark. > > [1] https://lkml.org/lkml/2015/9/25/152 -- Vitaly _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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