[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH for-4.10] libxc: load acpi RSDP table at correct address
On 20/11/2017 09:55, Juergen Gross wrote: > On 20/11/17 10:51, Roger Pau Monné wrote: >> Adding xen-devel, dropped it on my reply. >> >> Replying from my phone, sorry for the formatting. >> >> >> El 20 nov. 2017 9:35, "Juergen Gross" <jgross@xxxxxxxx >> <mailto:jgross@xxxxxxxx>> escribió: >> >> For PVH domains loading of the ACPI RSDP table is done via >> allocating >> a domain loader segment after having loaded the kernel. This >> leads to >> the RSDP table being loaded at an arbitrary guest address instead of >> the architectural correct address just below 1MB. >> >> >> AFAIK this is only true for legacy BIOS boot, when using UEFI the >> RSDP can be anywhere in memory, hence grub2 must already have an >> alternative way of finding the RSDP apart from scanning the low 1MB. > The problem isn't grub2, but the loaded linux kernel. Without this > patch Linux won't find the RSDP when booted in a PVH domain via grub2. > > I could modify grub2 even further to move the RSDP to the correct > address, but I think doing it correctly on Xen side is the better > option. Why? The PVH info block contains a pointer directly to the RSDP, and Linux should be following this rather than scanning for it using the legacy method. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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