From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.skyhub.de ([2a01:4f8:120:8448::d00d]) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VK7pm-0001bL-I0 for kexec@lists.infradead.org; Thu, 12 Sep 2013 14:25:29 +0000 Date: Thu, 12 Sep 2013 16:25:37 +0200 From: Borislav Petkov Subject: Re: [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam Message-ID: <20130912142537.GA10143@x1.alien8.de> References: <1378849471-10521-1-git-send-email-vgoyal@redhat.com> <1378849471-10521-16-git-send-email-vgoyal@redhat.com> <522FA2A8.8080703@zytor.com> <20130911114419.GB31551@x1.alien8.de> <20130911134534.GB15364@redhat.com> <20130911143216.GA933@x1.alien8.de> <20130912064930.GA5288@dhcp-16-126.nay.redhat.com> <20130912125350.GB9280@x1.alien8.de> <20130912131930.GC28500@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20130912131930.GC28500@redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: Vivek Goyal Cc: matthew.garrett@nebula.com, zohar@linux.vnet.ibm.com, d.kasatkin@samsung.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, ebiederm@xmission.com, "H. Peter Anvin" , akpm@linux-foundation.org, Dave Young On Thu, Sep 12, 2013 at 09:19:30AM -0400, Vivek Goyal wrote: > I did not understand this argument that we need to use high virtual > addresses because windows is using it and now we end up creating > fixed EFI addresses and that becomes an ABI. If EFI implementations The only thing that becomes sort-of ABI is that we start the mappings at -4G virtual. > are dependent on high addresses being passed, shouldn't it be those > implementations which need to be fixed instead of kernel fixing EFI Right, this is the biggest issue with firmware - vendors like to declare those as End-of-Life platforms and for them there are no fixes. This is the reason why we don't do the 1:1 mappings. > addresses in higher region. The thing is, reportedly some Apple UEFI implementations cannot stomach 1:1 SetVirtualAddressMap mappings. Also, the high addresses mappings is the only thing that vendors test on windoze so in that field we want to do what windoze does as this is the only thing that gets reliable testing. But I get the feeling we're feeling up stuff in the dark as firmware is closed crap which we cannot look at. HTH. -- Regards/Gruss, Boris. _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec