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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 07/15] xen/arm: mm: Re-implement early_fdt_map() using map_pages_to_xen()
Date: Wed, 12 May 2021 14:41:40 -0700 (PDT)	[thread overview]
Message-ID: <alpine.DEB.2.21.2105121437501.5018@sstabellini-ThinkPad-T480s> (raw)
In-Reply-To: <20210425201318.15447-8-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() calls by map_pages_to_xen() calls.
> 
> The mapping can also be marked read-only has Xen as no business to
> modify the host Device Tree.

I think that's good. Just FYI there is some work at Xilinx to make
changes to the device tree at runtime but we'll cross that bridge when
we come to it.

Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>


> Signed-off-by: Julien Grall <julien.grall@arm.com>
> Signed-off-by: Julien Grall <jgrall@amazon.com>
> 
> ---
>     Changes in v2:
>         - Add my AWS signed-off-by
>         - Fix typo in the commit message
> ---
>  xen/arch/arm/mm.c | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
> index 2cbfbe25240e..8fac24d80086 100644
> --- a/xen/arch/arm/mm.c
> +++ b/xen/arch/arm/mm.c
> @@ -558,6 +558,7 @@ void * __init early_fdt_map(paddr_t fdt_paddr)
>      paddr_t offset;
>      void *fdt_virt;
>      uint32_t size;
> +    int rc;
>  
>      /*
>       * Check whether the physical FDT address is set and meets the minimum
> @@ -573,8 +574,12 @@ void * __init early_fdt_map(paddr_t fdt_paddr)
>      /* The FDT is mapped using 2MB superpage */
>      BUILD_BUG_ON(BOOT_FDT_VIRT_START % SZ_2M);
>  
> -    create_mappings(xen_second, BOOT_FDT_VIRT_START, paddr_to_pfn(base_paddr),
> -                    SZ_2M >> PAGE_SHIFT, SZ_2M);
> +    rc = map_pages_to_xen(BOOT_FDT_VIRT_START, maddr_to_mfn(base_paddr),
> +                          SZ_2M >> PAGE_SHIFT,
> +                          PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
> +    if ( rc )
> +        panic("Unable to map the device-tree.\n");
> +
>  
>      offset = fdt_paddr % SECOND_SIZE;
>      fdt_virt = (void *)BOOT_FDT_VIRT_START + offset;
> @@ -588,9 +593,12 @@ void * __init early_fdt_map(paddr_t fdt_paddr)
>  
>      if ( (offset + size) > SZ_2M )
>      {
> -        create_mappings(xen_second, BOOT_FDT_VIRT_START + SZ_2M,
> -                        paddr_to_pfn(base_paddr + SZ_2M),
> -                        SZ_2M >> PAGE_SHIFT, SZ_2M);
> +        rc = map_pages_to_xen(BOOT_FDT_VIRT_START + SZ_2M,
> +                              maddr_to_mfn(base_paddr + SZ_2M),
> +                              SZ_2M >> PAGE_SHIFT,
> +                              PAGE_HYPERVISOR_RO | _PAGE_BLOCK);
> +        if ( rc )
> +            panic("Unable to map the device-tree\n");
>      }
>  
>      return fdt_virt;
> -- 
> 2.17.1
> 


  reply	other threads:[~2021-05-12 21:41 UTC|newest]

Thread overview: 58+ 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 [this message]
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
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
2021-05-15  9:25     ` Julien Grall
2021-05-18  0:51       ` Stefano Stabellini

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