On 08/05/13 16:03, Borislav Petkov wrote: > On Mon, Aug 05, 2013 at 03:39:31PM +0200, Laszlo Ersek wrote: >> My question was: is my understanding correct that you only see this >> problem with "-enable-kvm"? Because, >> >> On 08/01/13 18:49, Borislav Petkov wrote: >>> so I'm seeing this funny thing where an EFI region changes when we >>> enter efi_enter_virtual_mode when booting with edk2 on kvm. Here's >>> the diff: >> >> You said "on kvm", and provided a diff. I think (hope) I understand the >> environment you've denoted with "after", but what's your "before"? The >> absence of "-enable-kvm", or something else? > > Ah, I see. > > So 'before' is the initial dump of the EFI regions, very early during > boot: <snip> > and with 'after' I've denoted the dump of the EFI regions a second time, > a bit later, when we enter efi_enter_virtual_mode(): <snip> > > during the *same* boot. > > So, it is one boot but two dumps of the EFI regions. And yes, I'm > booting with the 'kvm' executable which has '-enable-kvm' Okay. Thanks for clarifying it. > >> What's the purpose of that series? Can you please provide a link (if >> you posted versions of it already)? > > Not yet posted but working on it. > > The idea is to map the runtime regions at stable addresses so that when > we kexec a kernel, it can use runtime services too. And we have to do > that because of the braindead design of SetVirtualAddressMap() being > callable only once per boot. I wouldn't call the design of SetVirtualAddressMap() braindead. I'd rather call kexec unique and somewhat unexpected :) > >>> So what basically happens is the end boundary of the region becomes the >>> start, practically turning it into a 0-size one. >> >> ... and you guys suspect that some firmware code is responsible, code >> that runs between the initial memory map dump, and efi_enter_virtual_mode(): >> >> https://lkml.org/lkml/2013/7/31/550 > > I wouldn't wonder if we f*cked it up again like the last time. I'll give > it a long hard look. Ah sorry, by "and you guys suspect" I didn't mean to imply anything between the lines, I was simply trying to ascertain your working idea :) Laszlo -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
