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Re: [Xen-devel] [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen


  • To: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
  • From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
  • Date: Tue, 10 Apr 2018 09:46:34 -0400
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  • Cc: jgross@xxxxxxxx
  • Delivery-date: Tue, 10 Apr 2018 13:45:17 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 04/09/2018 02:51 PM, Boris Ostrovsky wrote:
> Pre-4.17 kernels ignored start_info's rsdp_paddr pointer and instead
> relied on finding RSDP in standard location in BIOS RO memory. This
> has worked since that's where Xen used to place it.
>
> However, with recent Xen change (commit 4a5733771e6f ("libxl: put RSDP
> for PVH guest near 4GB")) it prefers to keep RSDP at a "non-standard"
> address. Even though as of commit b17d9d1df3c3 ("x86/xen: Add pvh
> specific rsdp address retrieval function") Linux is able to find RSDP,
> for back-compatibility reasons we need to indicate to Xen that we can
> handle this, an we do so by setting XENFEAT_linux_rsdp_unrestricted
> flag in ELF notes.
>
> (Also take this opportunity and sync features.h header file with Xen)
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>



Committed to for-linus-4.17.

-boris


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