[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen/arm: mm: Allocate xen page tables in domheap rather than xenheap
commit 922936dc0657c3f6f21023308e93bc681762faf6 Author: Julien Grall <jgrall@xxxxxxxxxx> AuthorDate: Fri May 20 13:09:28 2022 +0100 Commit: Julien Grall <jgrall@xxxxxxxxxx> CommitDate: Wed Jun 8 11:04:53 2022 +0100 xen/arm: mm: Allocate xen page tables in domheap rather than xenheap xen_{un,}map_table() already uses the helper to map/unmap pages on-demand (note this is currently a NOP on arm64). So switching to domheap don't have any disavantage. But this as the benefit: - to keep the page tables unmapped if an arch decided to do so - reduce xenheap use on arm32 which can be pretty small Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx> Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx> --- xen/arch/arm/mm.c | 36 +++++++++++++++++++++--------------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c index 47c2111c36..252114d67d 100644 --- a/xen/arch/arm/mm.c +++ b/xen/arch/arm/mm.c @@ -988,21 +988,6 @@ void *ioremap(paddr_t pa, size_t len) return ioremap_attr(pa, len, PAGE_HYPERVISOR_NOCACHE); } -static int create_xen_table(lpae_t *entry) -{ - void *p; - lpae_t pte; - - p = alloc_xenheap_page(); - if ( p == NULL ) - return -ENOMEM; - clear_page(p); - pte = mfn_to_xen_entry(virt_to_mfn(p), MT_NORMAL); - pte.pt.table = 1; - write_pte(entry, pte); - return 0; -} - static lpae_t *xen_map_table(mfn_t mfn) { /* @@ -1043,6 +1028,27 @@ static void xen_unmap_table(const lpae_t *table) unmap_domain_page(table); } +static int create_xen_table(lpae_t *entry) +{ + struct page_info *pg; + void *p; + lpae_t pte; + + pg = alloc_domheap_page(NULL, 0); + if ( pg == NULL ) + return -ENOMEM; + + p = xen_map_table(page_to_mfn(pg)); + clear_page(p); + xen_unmap_table(p); + + pte = mfn_to_xen_entry(page_to_mfn(pg), MT_NORMAL); + pte.pt.table = 1; + write_pte(entry, pte); + + return 0; +} + #define XEN_TABLE_MAP_FAILED 0 #define XEN_TABLE_SUPER_PAGE 1 #define XEN_TABLE_NORMAL_PAGE 2 -- generated by git-patchbot for /home/xen/git/xen.git#staging
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