[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] xen/arm: mm: Allow page-table allocation from the boot allocator
commit 77f00c2f023ef1236ec29347bcef13069971fae2 Author: Julien Grall <julien.grall@xxxxxxx> AuthorDate: Fri May 20 13:09:29 2022 +0100 Commit: Julien Grall <jgrall@xxxxxxxxxx> CommitDate: Wed Jun 8 11:04:53 2022 +0100 xen/arm: mm: Allow page-table allocation from the boot allocator At the moment, page-table can only be allocated from domheap. This means it is not possible to create mapping in the page-tables via map_pages_to_xen() if page-table needs to be allocated. In order to avoid open-coding page-tables update in early boot, we need to be able to allocate page-tables much earlier. Thankfully, we have the boot allocator for those cases. create_xen_table() is updated to cater early boot allocation by using alloc_boot_pages(). Note, this is not sufficient to bootstrap the page-tables (i.e mapping before any memory is actually mapped). This will be addressed separately. Signed-off-by: Julien Grall <julien.grall@xxxxxxx> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> --- xen/arch/arm/mm.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 252114d67d..6b7b72de27 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -1030,19 +1030,27 @@ static void xen_unmap_table(const lpae_t *table) static int create_xen_table(lpae_t *entry) { - struct page_info *pg; + mfn_t mfn; void *p; lpae_t pte; - pg = alloc_domheap_page(NULL, 0); - if ( pg == NULL ) - return -ENOMEM; + if ( system_state != SYS_STATE_early_boot ) + { + struct page_info *pg = alloc_domheap_page(NULL, 0); + + if ( pg == NULL ) + return -ENOMEM; + + mfn = page_to_mfn(pg); + } + else + mfn = alloc_boot_pages(1, 1); - p = xen_map_table(page_to_mfn(pg)); + p = xen_map_table(mfn); clear_page(p); xen_unmap_table(p); - pte = mfn_to_xen_entry(page_to_mfn(pg), MT_NORMAL); + pte = mfn_to_xen_entry(mfn, MT_NORMAL); pte.pt.table = 1; write_pte(entry, pte); -- generated by git-patchbot for /home/xen/git/xen.git#master
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