From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien@xen.org>
Cc: xen-devel@lists.xenproject.org, Wei.Chen@arm.com,
Henry.Wang@arm.com, Penny.Zheng@arm.com,
Bertrand.Marquis@arm.com, Julien Grall <julien.grall@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
Julien Grall <jgrall@amazon.com>
Subject: Re: [PATCH RFCv2 15/15] xen/arm: mm: Re-implement setup_frame_table_mappings() with map_pages_to_xen()
Date: Fri, 14 May 2021 17:02:59 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.21.2105141658510.14426@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <20210425201318.15447-16-julien@xen.org>
On Sun, 25 Apr 2021, Julien Grall wrote:
> From: Julien Grall <julien.grall@arm.com>
>
> Now that map_pages_to_xen() has been extended to support 2MB mappings,
> we can replace the create_mappings() call by map_pages_to_xen() call.
>
> This has the advantage to remove the different between 32-bit and 64-bit
> code.
>
> Lastly remove create_mappings() as there is no more callers.
>
> Signed-off-by: Julien Grall <julien.grall@arm.com>
> Signed-off-by: Julien Grall <jgrall@amazon.com>
>
> ---
> Changes in v2:
> - New patch
>
> TODO:
> - Add support for setting the contiguous bit
> ---
> xen/arch/arm/mm.c | 64 +++++------------------------------------------
> 1 file changed, 6 insertions(+), 58 deletions(-)
>
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index c49403b687f5..5f8ae029dd6d 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -359,40 +359,6 @@ void clear_fixmap(unsigned map)
> BUG_ON(res != 0);
> }
>
> -/* Create Xen's mappings of memory.
> - * Mapping_size must be either 2MB or 32MB.
> - * Base and virt must be mapping_size aligned.
> - * Size must be a multiple of mapping_size.
> - * second must be a contiguous set of second level page tables
> - * covering the region starting at virt_offset. */
> -static void __init create_mappings(lpae_t *second,
> - unsigned long virt_offset,
> - unsigned long base_mfn,
> - unsigned long nr_mfns,
> - unsigned int mapping_size)
> -{
> - unsigned long i, count;
> - const unsigned long granularity = mapping_size >> PAGE_SHIFT;
> - lpae_t pte, *p;
> -
> - ASSERT((mapping_size == MB(2)) || (mapping_size == MB(32)));
> - ASSERT(!((virt_offset >> PAGE_SHIFT) % granularity));
> - ASSERT(!(base_mfn % granularity));
> - ASSERT(!(nr_mfns % granularity));
> -
> - count = nr_mfns / LPAE_ENTRIES;
> - p = second + second_linear_offset(virt_offset);
> - pte = mfn_to_xen_entry(_mfn(base_mfn), MT_NORMAL);
> - if ( granularity == 16 * LPAE_ENTRIES )
> - pte.pt.contig = 1; /* These maps are in 16-entry contiguous chunks. */
> - for ( i = 0; i < count; i++ )
> - {
> - write_pte(p + i, pte);
> - pte.pt.base += 1 << LPAE_SHIFT;
> - }
> - flush_xen_tlb_local();
> -}
> -
> #ifdef CONFIG_DOMAIN_PAGE
> void *map_domain_page_global(mfn_t mfn)
> {
> @@ -850,36 +816,18 @@ void __init setup_frametable_mappings(paddr_t ps, paddr_t pe)
> unsigned long frametable_size = nr_pdxs * sizeof(struct page_info);
> mfn_t base_mfn;
> const unsigned long mapping_size = frametable_size < MB(32) ? MB(2) : MB(32);
> -#ifdef CONFIG_ARM_64
> - lpae_t *second, pte;
> - unsigned long nr_second;
> - mfn_t second_base;
> - int i;
> -#endif
> + int rc;
>
> frametable_base_pdx = mfn_to_pdx(maddr_to_mfn(ps));
> /* Round up to 2M or 32M boundary, as appropriate. */
> frametable_size = ROUNDUP(frametable_size, mapping_size);
> base_mfn = alloc_boot_pages(frametable_size >> PAGE_SHIFT, 32<<(20-12));
>
> -#ifdef CONFIG_ARM_64
> - /* Compute the number of second level pages. */
> - nr_second = ROUNDUP(frametable_size, FIRST_SIZE) >> FIRST_SHIFT;
> - second_base = alloc_boot_pages(nr_second, 1);
> - second = mfn_to_virt(second_base);
> - for ( i = 0; i < nr_second; i++ )
> - {
> - clear_page(mfn_to_virt(mfn_add(second_base, i)));
> - pte = mfn_to_xen_entry(mfn_add(second_base, i), MT_NORMAL);
> - pte.pt.table = 1;
> - write_pte(&xen_first[first_table_offset(FRAMETABLE_VIRT_START)+i], pte);
> - }
> - create_mappings(second, 0, mfn_x(base_mfn), frametable_size >> PAGE_SHIFT,
> - mapping_size);
> -#else
> - create_mappings(xen_second, FRAMETABLE_VIRT_START, mfn_x(base_mfn),
> - frametable_size >> PAGE_SHIFT, mapping_size);
> -#endif
> + /* XXX: Handle contiguous bit */
> + rc = map_pages_to_xen(FRAMETABLE_VIRT_START, base_mfn,
> + frametable_size >> PAGE_SHIFT, PAGE_HYPERVISOR_RW);
> + if ( rc )
> + panic("Unable to setup the frametable mappings.\n");
This is a lot better.
I take that "XXX: Handle contiguous bit" refers to the lack of
_PAGE_BLOCK. Why can't we just | _PAGE_BLOCK like in other places?
> memset(&frame_table[0], 0, nr_pdxs * sizeof(struct page_info));
> memset(&frame_table[nr_pdxs], -1,
next prev parent reply other threads:[~2021-05-15 0:03 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-25 20:13 [PATCH RFCv2 00/15] xen/arm: mm: Remove open-coding mappings Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 01/15] xen/arm: lpae: Rename LPAE_ENTRIES_MASK_GS to LPAE_ENTRY_MASK_GS Julien Grall
2021-05-11 22:12 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 02/15] xen/arm: lpae: Use the generic helpers to defined the Xen PT helpers Julien Grall
2021-05-11 22:26 ` Stefano Stabellini
2021-05-12 14:26 ` Julien Grall
2021-05-12 21:30 ` Stefano Stabellini
2021-05-12 22:16 ` Julien Grall
2021-05-13 22:44 ` Stefano Stabellini
2021-07-03 17:32 ` Julien Grall
2021-07-13 20:53 ` Stefano Stabellini
2021-07-14 17:40 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 03/15] xen/arm: p2m: Replace level_{orders, masks} arrays with LEVEL_{ORDER, MASK} Julien Grall
2021-05-11 22:33 ` Stefano Stabellini
2021-05-12 14:39 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 04/15] xen/arm: mm: Allow other mapping size in xen_pt_update_entry() Julien Grall
2021-05-11 22:42 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 05/15] xen/arm: mm: Avoid flushing the TLBs when mapping are inserted Julien Grall
2021-05-11 22:51 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 06/15] xen/arm: mm: Don't open-code Xen PT update in remove_early_mappings() Julien Grall
2021-05-11 22:58 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 07/15] xen/arm: mm: Re-implement early_fdt_map() using map_pages_to_xen() Julien Grall
2021-05-12 21:41 ` Stefano Stabellini
2021-05-12 22:18 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 08/15] xen/arm32: mm: Check if the virtual address is shared before updating it Julien Grall
2021-05-12 22:00 ` Stefano Stabellini
2021-05-12 22:23 ` Julien Grall
2021-05-13 22:32 ` Stefano Stabellini
2021-05-13 22:59 ` Julien Grall
2021-05-14 1:04 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 09/15] xen/arm32: mm: Re-implement setup_xenheap_mappings() using map_pages_to_xen() Julien Grall
2021-05-12 22:07 ` Stefano Stabellini
2021-05-13 17:55 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 10/15] xen/arm: mm: Allocate xen page tables in domheap rather than xenheap Julien Grall
2021-05-12 22:44 ` Stefano Stabellini
2021-05-13 18:09 ` Julien Grall
2021-05-13 22:27 ` Stefano Stabellini
2021-05-15 8:48 ` Julien Grall
2021-05-18 0:37 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 11/15] xen/arm: mm: Allow page-table allocation from the boot allocator Julien Grall
2021-05-13 22:58 ` Stefano Stabellini
2021-04-25 20:13 ` [PATCH RFCv2 12/15] xen/arm: add Persistent Map (PMAP) infrastructure Julien Grall
2021-04-26 9:41 ` Xia, Hongyan
2021-07-03 17:57 ` Julien Grall
2021-04-28 21:47 ` Wei Liu
2021-05-14 23:25 ` Stefano Stabellini
2021-05-15 8:54 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 13/15] xen/arm: mm: Use the PMAP helpers in xen_{,un}map_table() Julien Grall
2021-05-14 23:35 ` Stefano Stabellini
2021-05-15 9:03 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 14/15] xen/arm: mm: Rework setup_xenheap_mappings() Julien Grall
2021-05-14 23:51 ` Stefano Stabellini
2021-05-15 9:21 ` Julien Grall
2021-05-18 0:50 ` Stefano Stabellini
2022-02-12 19:16 ` Julien Grall
2021-04-25 20:13 ` [PATCH RFCv2 15/15] xen/arm: mm: Re-implement setup_frame_table_mappings() with map_pages_to_xen() Julien Grall
2021-05-15 0:02 ` Stefano Stabellini [this message]
2021-05-15 9:25 ` Julien Grall
2021-05-18 0:51 ` Stefano Stabellini
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