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Even if only a single page is to be added, it's unknown whether the p2m or the IOMMU will require splitting the provided page into smaller ones, and thus in case of having to break a 1G page into 4K entries the amount of time taken by a single of those additions will be non-trivial. Stay on the safe side an check for pending softirqs on ever successful loop iteration. Fixes: 5427134eae ('x86: populate PVHv2 Dom0 physical memory map') Signed-off-by: Roger Pau Monn=C3=A9 Reviewed-by: Jan Beulich --- Changes since v1: - Unconditionally process softirqs after every successful loop iteration. --- xen/arch/x86/hvm/dom0_build.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/xen/arch/x86/hvm/dom0_build.c b/xen/arch/x86/hvm/dom0_build.c index 549ff8ec7c..cbc28113cb 100644 --- a/xen/arch/x86/hvm/dom0_build.c +++ b/xen/arch/x86/hvm/dom0_build.c @@ -114,10 +114,9 @@ static int __init pvh_populate_memory_range(struct dom= ain *d, { .align =3D PFN_DOWN(MB(2)), .order =3D PAGE_ORDER_2M }, { .align =3D PFN_DOWN(KB(4)), .order =3D PAGE_ORDER_4K }, }; - unsigned int max_order =3D MAX_ORDER, i =3D 0; + unsigned int max_order =3D MAX_ORDER; struct page_info *page; int rc; -#define MAP_MAX_ITER 64 =20 while ( nr_pages !=3D 0 ) { @@ -186,12 +185,16 @@ static int __init pvh_populate_memory_range(struct do= main *d, start +=3D 1UL << order; nr_pages -=3D 1UL << order; order_stats[order]++; - if ( (++i % MAP_MAX_ITER) =3D=3D 0 ) - process_pending_softirqs(); + /* + * Process pending softirqs on every successful loop: it's unknown + * whether the p2m/IOMMU code will have split the page into multip= le + * smaller entries, and thus the time consumed would be much higher + * than populating a single entry. + */ + process_pending_softirqs(); } =20 return 0; -#undef MAP_MAX_ITER } =20 /* Steal RAM from the end of a memory region. */ --=20 2.34.1