Vitaly Kuznetsov de75abbe01 arm/xen: fix SMP guests boot ... Commit 88e957d6e4 ("xen: introduce xen_vcpu_id mapping") broke SMP ARM guests on Xen. When FIFO-based event channels are in use (this is the default), evtchn_fifo_alloc_control_block() is called on CPU_UP_PREPARE event and this happens before we set up xen_vcpu_id mapping in xen_starting_cpu. Temporary fix the issue by setting direct Linux CPU id <-> Xen vCPU id mapping for all possible CPUs at boot. We don't currently support kexec/kdump on Xen/ARM so these ids always match. In future, we have several ways to solve the issue, e.g.: - Eliminate all hypercalls from CPU_UP_PREPARE, do them from the starting CPU. This can probably be done for both x86 and ARM and, if done, will allow us to get Xen's idea of vCPU id from CPUID/MPIDR on the starting CPU directly, no messing with ACPI/device tree required. - Save vCPU id information from ACPI/device tree on ARM and use it to initialize xen_vcpu_id mapping. This is the same trick we currently do on x86. Reported-by: Julien Grall <julien.grall@arm.com> Tested-by: Wei Chen <Wei.Chen@arm.com> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Acked-by: Stefano Stabellini <sstabellini@kernel.org> Signed-off-by: David Vrabel <david.vrabel@citrix.com>		2016-09-14 14:39:13 +01:00
..
efi.c	ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services	2016-07-06 10:34:46 +01:00
enlighten.c	arm/xen: fix SMP guests boot	2016-09-14 14:39:13 +01:00
grant-table.c
hypercall.S	arm/xen: add support for vm_assist hypercall	2016-07-06 10:42:14 +01:00
Makefile	ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services	2016-07-06 10:34:46 +01:00
mm.c	dma-mapping: use unsigned long for dma_attrs	2016-08-04 08:50:07 -04:00
p2m.c