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xen: introduce xen_vcpu_id mapping

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It may happen that Xen's and Linux's ideas of vCPU id diverge. In
particular, when we crash on a secondary vCPU we may want to do kdump
and unlike plain kexec where we do migrate_to_reboot_cpu() we try
booting on the vCPU which crashed. This doesn't work very well for
PVHVM guests as we have a number of hypercalls where we pass vCPU id
as a parameter. These hypercalls either fail or do something
unexpected.

To solve the issue introduce percpu xen_vcpu_id mapping. ARM and PV
guests get direct mapping for now. Boot CPU for PVHVM guest gets its
id from CPUID. With secondary CPUs it is a bit more
trickier. Currently, we initialize IPI vectors before these CPUs boot
so we can't use CPUID. Use ACPI ids from MADT instead.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Vitaly Kuznetsov 2016-06-30 17:56:37 +02:00 • committed by David Vrabel
parent 3e9e57fad3
commit 88e957d6e4
3 changed files with 38 additions and 1 deletions
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6
include/xen/xen-ops.h
View file

@ -9,6 +9,12 @@
DECLARE_PER_CPU(struct vcpu_info *, xen_vcpu);
DECLARE_PER_CPU(int, xen_vcpu_id);
static inline int xen_vcpu_nr(int cpu)
{
return per_cpu(xen_vcpu_id, cpu);
}
void xen_arch_pre_suspend(void);
void xen_arch_post_suspend(int suspend_cancelled);