From mboxrd@z Thu Jan 1 00:00:00 1970 From: Borislav Petkov Subject: Re: [PATCH 3/4] x86, efi: Add an efi= kernel command line parameter Date: Thu, 6 Jun 2013 23:02:18 +0200 Message-ID: <20130606210218.GR20972@pd.tnic> References: <20130606185140.GK20972@pd.tnic> <20130606193548.GA2946@srcf.ucam.org> <20130606194134.GN20972@pd.tnic> <20130606195450.GA3252@srcf.ucam.org> <20130606200705.GO20972@pd.tnic> <20130606201828.GA3950@srcf.ucam.org> <20130606202717.GP20972@pd.tnic> <20130606203057.GA4237@srcf.ucam.org> <20130606204410.GQ20972@pd.tnic> <20130606205057.GA4363@srcf.ucam.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Return-path: Content-Disposition: inline In-Reply-To: <20130606205057.GA4363-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Matthew Garrett Cc: Matt Fleming , Linux EFI , Jiri Kosina , X86-ML , LKML , Borislav Petkov List-Id: linux-efi@vger.kernel.org On Thu, Jun 06, 2013 at 09:50:57PM +0100, Matthew Garrett wrote: > What do you mean by "call them"? I don't think we ever want to call by > physical address, other than maybe in the kexec case. The only reason > we really care about the physical addresses being mapped 1:1 is that > some pointers may not have been updated. I want to be able to call the runtime services in the kexec kernel. Which means, the kexec kernel would simply map the runtime code/data regions 1:1 and then use the physical addresses to call the runtime services. Question is: would that work even if SetVirtualAddressMap has already run in the original kernel and with virtual addresses? -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. --