[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v16 7/9] x86: make Xen early boot code relocatable
On Thu, Apr 13, 2017 at 04:11:25PM +0200, Daniel Kiper wrote: > On Fri, Apr 07, 2017 at 05:23:33AM -0600, Jan Beulich wrote: > > >>> On 21.02.17 at 20:19, <daniel.kiper@xxxxxxxxxx> wrote: > > > Every multiboot protocol (regardless of version) compatible image must > > > specify its load address (in ELF or multiboot header). Multiboot protocol > > > compatible loader have to load image at specified address. However, there > > > is no guarantee that the requested memory region (in case of Xen it starts > > > at 2 MiB and ends at ~5 MiB) where image should be loaded initially is a > > > RAM > > > and it is free (legacy BIOS platforms are merciful for Xen but I found at > > > least one EFI platform on which Xen load address conflicts with EFI boot > > > services; it is Dell PowerEdge R820 with latest firmware). To cope with > > > that > > > problem we must make Xen early boot code relocatable and help boot loader > > > to > > > relocate image in proper way by suggesting, not requesting specific load > > > addresses as it is right now, allowed address ranges. This patch does > > > former. > > > It does not add multiboot2 protocol interface which is done in "x86: add > > > multiboot2 protocol support for relocatable images" patch. > > > > > > This patch changes following things: > > > - %esi register is used as a storage for Xen image load base address; > > > it is mostly unused in early boot code and preserved during C > > > functions > > > calls in 32-bit mode, > > > - %fs is used as base for Xen data relative addressing in 32-bit code > > > if it is possible; %esi is used for that thing during error printing > > > because it is not always possible to properly and efficiently > > > initialize %fs. > > > > > > Signed-off-by: Daniel Kiper <daniel.kiper@xxxxxxxxxx> > > > > Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx> > > It looks that everything passed through test gate and landed in master. > So, this way we have full multiboot2 support in Xen. This means that > you can boot Xen using GRUB2 on EFI platforms. > > I would like to thank everybody who helped me to make it happen. > Especially Jan who patiently reviewed whole series many times > and replied for my stupid questions. > <Konrad unscrews the vodka bottle!> Yeeeeey! Congrats! > Daniel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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