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From: Boris Ostrovsky <>
Subject: Re: [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen
Date: Tue, 10 Apr 2018 09:46:34 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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 <>

Committed to for-linus-4.17.


      parent reply	other threads:[~2018-04-10 13:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-09 18:51 [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen Boris Ostrovsky
2018-04-10  5:32 ` Juergen Gross
2018-04-10  8:35 ` [Xen-devel] " Wei Liu
2018-04-10 13:46 ` Boris Ostrovsky [this message]

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