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xen-devel
Re: [Xen-devel] [PATCH] Fixing PAE SMP dom0 hang at boot time (take 2)
On 17 Nov 2005, at 06:46, Nakajima, Jun wrote:
The max value of (vcpuid << PDPT_VCPU_SHIFT) + FIRST_RESERVED_GDT_PAGE
is 1006 (< 1024), but the size of each entry is 8 bytes for PAE (and
x86_64), so alloc_xenheap_page() (i.e. a single page) was not
sufficient, and it's corrupting the next page which contains the areas
for vcpu_info, which contains evtchn_upcall_pending for vcpus. That
affected vcpu 7 (and 23) on my machine, and at load_LDT, we check the
pending events at hypercall_preempt_check(), and it's already on for
vcpu 7, but it's never cleared by hypercall4_create_continuation()
because nobody set such events... So it was looping there.
Thanks Jun! I've fixed your patch a little (e.g., to deallocate the
correct number of pages) and checked into our staging tree. Hopefully I
haven't broken it again. :-)
-- Keir
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