Messages in this thread | | | Date | Tue, 10 Apr 2018 09:35:44 +0100 | From | Wei Liu <> | Subject | Re: [Xen-devel] [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen |
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On Mon, Apr 09, 2018 at 02:51:44PM -0400, 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@oracle.com>
Reviewed-by: Wei Liu <wei.liu2@citrix.com>
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