[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen stable-4.9] xen/page_alloc: Cover memory unreserved after boot in first_valid_mfn
commit 84c039eaf73a0ffd05a04330bb2763b0a2291609 Author: Julien Grall <julien.grall@xxxxxxx> AuthorDate: Fri Oct 6 14:59:00 2017 +0200 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Oct 6 14:59:00 2017 +0200 xen/page_alloc: Cover memory unreserved after boot in first_valid_mfn On Arm, some regions (e.g Initramfs, Dom0 Kernel...) are marked as reserved until the hardware domain is built and they are copied into its memory. Therefore, they will not be added in the boot allocator via init_boot_pages. Instead, init_xenheap_pages will be called once the region are not used anymore. Update first_valid_mfn in both init_heap_pages and init_boot_pages (already exist) to cover all the cases. This is XSA-245. Signed-off-by: Julien Grall <julien.grall@xxxxxxx> [Adjust comment, added locking around first_valid_mfn update] Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx> Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> Reported-and-Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> master commit: ec6d9023e1f54cdccbf2e4c63cf947f1be2b1e8e master date: 2017-09-29 13:22:52 -0700 --- xen/common/page_alloc.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c index d6835bb..d4c6eb4 100644 --- a/xen/common/page_alloc.c +++ b/xen/common/page_alloc.c @@ -1273,6 +1273,16 @@ static void init_heap_pages( { unsigned long i; + /* + * Some pages may not go through the boot allocator (e.g reserved + * memory at boot but released just after --- kernel, initramfs, + * etc.). + * Update first_valid_mfn to ensure those regions are covered. + */ + spin_lock(&heap_lock); + first_valid_mfn = min_t(unsigned long, page_to_mfn(pg), first_valid_mfn); + spin_unlock(&heap_lock); + for ( i = 0; i < nr_pages; i++ ) { unsigned int nid = phys_to_nid(page_to_maddr(pg+i)); -- generated by git-patchbot for /home/xen/git/xen.git#stable-4.9 _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxx https://lists.xenproject.org/xen-changelog
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