[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen
On Tue, Oct 22, 2013 at 03:24:28PM +0100, Ian Campbell wrote: > On Tue, 2013-10-22 at 10:09 -0400, Konrad Rzeszutek Wilk wrote: > > > So it can be booted the same way as xen.efi. But my understanding is > > that folks prefer a bootloader instead of loading the bzImage in an > > NVRAM of a platform with pre-set parameters. Hence that mechanism > > is not used by the majority of users. > > My understanding is that they prefer a bootloader which can launch Linux > as a PE/COFF image, i.e. the linuxefi thing. > > > Instead the majority of users would like to use a bootloader, like > > GRUB2. And there are certain restrictions - if you launch from it > > an PE/COFF application GRUB2 will call ExitBootServices. But if > > you launch the Linux image (so using the linuxefi), it WILL NOT > > call ExitBootServices. > > "linuxefi" won't call ExitBootServices but it will launch as a PE/COFF > application not as a "Linux image", that's right isn't it? I think that > is the whole point of it. No. The linuxefi will parse the payload and verify that it has the Linux x86/boot protocol. So any PE/COFF image won't do. (See grub_cmd_linux in grub-core/loader/i386/efi/linux.c) If you use 'linux' module, it will call ExitBootService. If you use 'multiboot' module, it will call ExitBootService too. So if you don't want to the module to call 'grub_efi_finish_boot_services' you need to use 'linuxefi' :-) And I still haven't found the module that can launch any PE/COFF image from GRUB2. Maybe that is a myth. > > The "launch as a Linux image" grub command is called just "linux" (and > "kernel" may be a synonym). > > > But I say that (about ExitBootServices) - and I can't find it in > > the GRUB2 code, so perhaps I am mistaken. > > linuxefi isn't in the upstream grub2 tree -- all the distros are > carrying it as a patch. So if you are grepping upstream you won't find > it. Right, I am looking at Fedora 19's GRUB2 sources. > > Ian. > _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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