Hi all,
I have some troubles to start xen when using dom0 in HVM mode on X86 Intel
nuc7i5bnh
board. After some investigation it seems that "domheap" memory allocator is
out of memory while
constructing the p2m mapping (pvh_setup_p2m).
This misbehavior, from my understanding, is the result of wrong computation of
number of pages
to "give" to dom0 (dom0_compute_nr_pages function). In fact the pages needed to
paging
(dom0_paging_pages function) are not reserved in this function if IOMMU
mappings are shareable
with HAP(EPT) mappings. Moreover this memory (for paging needs) is allocated
just after that in
"pvh_setup_p2m" in subroutine "paging_set_allocation".
Generally speaking from what I understood it's not the IOMMU driver that offers
its mappings to HAP,
but it's rather the HAP that shares its mappings with IOMMU driver. So the
obvious patch IMHO would
be:
--- a/xen/arch/x86/dom0_build.c
+++ b/xen/arch/x86/dom0_build.c
@@ -294,8 +294,7 @@ unsigned long __init dom0_compute_nr_pages(
avail -= max_pdx >> s;
}
- need_paging = is_hvm_domain(d) &&
- (!iommu_hap_pt_share || !paging_mode_hap(d));
+ need_paging = is_hvm_domain(d);
for ( ; ; need_paging = false )
{
nr_pages = dom0_nrpages;
Did anyone encounter the same problem or has some thoughts on this issue?
Andrei.
1
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