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Re: [Xen-devel] [PATCH] x86/PVH/libxl: Check whether Linux guest can handle RSDP at 4G boundary

On 08/04/18 01:03, Boris Ostrovsky wrote:
> Commit 4a5733771e6f ("libxl: put RSDP for PVH guest near 4GB") breaks
> pre-4.17 Linux guests since they do not use start_info's rsdp_paddr
> pointer and instread scan BIOS memory for RSDP signature.
> Introduce XENFEAT_rsdp_unrestricted feature flag that indicates whether
> the guest can handle RSDP at locations pointed to by rsdp_paddr.
> Since only Linux PVH guests suffer from this problem (BSD has always
> relied on rsdp_paddr) we check this flag just for those guests. If the
> flag is not set we place RSDP in BIOS, as before.
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>


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