From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752198AbdCPRvm (ORCPT ); Thu, 16 Mar 2017 13:51:42 -0400 Received: from mail-pg0-f51.google.com ([74.125.83.51]:34275 "EHLO mail-pg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750970AbdCPRvk (ORCPT ); Thu, 16 Mar 2017 13:51:40 -0400 Date: Thu, 16 Mar 2017 10:50:48 -0700 From: Omar Sandoval To: Matt Fleming Cc: Dave Young , Ingo Molnar , linux-kernel@vger.kernel.org, kernel-team@fb.com, kexec@lists.infradead.org, linux-efi@vger.kernel.org Subject: Re: kexec regression since 4.9 caused by efi Message-ID: <20170316175048.GA25230@vader.DHCP.thefacebook.com> References: <20170308201616.GC8598@vader> <20170309063806.GB17257@dhcp-128-65.nay.redhat.com> <20170309095408.GA17883@vader> <20170313073748.GA6332@dhcp-128-65.nay.redhat.com> <20170316124132.GF6261@codeblueprint.co.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170316124132.GF6261@codeblueprint.co.uk> User-Agent: Mutt/1.8.0 (2017-02-23) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 16, 2017 at 12:41:32PM +0000, Matt Fleming wrote: > On Mon, 13 Mar, at 03:37:48PM, Dave Young wrote: > > > > Omar, could you try below patch? Looking at the efi_mem_desc_lookup, it is not > > correct to be used in efi_arch_mem_reserve, if it passed your test, I > > can rewrite patch log with more background and send it out: > > > > for_each_efi_memory_desc(md) { > > [snip] > > if (!(md->attribute & EFI_MEMORY_RUNTIME) && > > md->type != EFI_BOOT_SERVICES_DATA && > > md->type != EFI_RUNTIME_SERVICES_DATA) { > > continue; > > } > > > > In above code, it meant to get a md of EFI_MEMORY_RUNTIME of either boot > > data or runtime data, this is wrong for efi_mem_reserve, because we are > > reserving boot data which has no EFI_MEMORY_RUNTIME attribute at the > > running time. Just is happened to work and we did not capture the error. > > Wouldn't something like this be simpler? > > --- > > diff --git a/arch/x86/platform/efi/quirks.c b/arch/x86/platform/efi/quirks.c > index 30031d5293c4..cdfe8c628959 100644 > --- a/arch/x86/platform/efi/quirks.c > +++ b/arch/x86/platform/efi/quirks.c > @@ -201,6 +201,10 @@ void __init efi_arch_mem_reserve(phys_addr_t addr, u64 size) > return; > } > > + /* No need to reserve regions that will never be freed. */ > + if (md.attribute & EFI_MEMORY_RUNTIME) > + return; > + > size += addr % EFI_PAGE_SIZE; > size = round_up(size, EFI_PAGE_SIZE); > addr = round_down(addr, EFI_PAGE_SIZE); This works for me. Reported-and-tested-by: Omar Sandoval