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Wed, 21 Aug 2019 07:22:55 +0000 From: Chester Lin To: Mike Rapoport CC: Ard Biesheuvel , "guillaume.gardet@arm.com" , Russell King - ARM Linux admin , "ren_guo@c-sky.com" , "mingo@kernel.org" , "akpm@linux-foundation.org" , "geert@linux-m68k.org" , "linux-arm-kernel@lists.infradead.org" , Chester Lin , Gary Lin , Juergen Gross , Joey Lee , "linux-efi@vger.kernel.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH] efi/arm: fix allocation failure when reserving the kernel base Thread-Topic: [PATCH] efi/arm: fix allocation failure when reserving the kernel base Thread-Index: AQHVSPSS9nx4lee000qskpi0lgLxmKcECttKgAAI7GKAASiQgIAAByF/gAAKISyAAALiAA== Date: Wed, 21 Aug 2019 07:22:55 +0000 Message-ID: <20190821072232.GA5547@linux-8mug> References: <20190802053744.5519-1-clin@suse.com> <20190820115645.GP13294@shell.armlinux.org.uk> <20190821061027.GA2828@linux-8mug> <20190821071100.GA26713@rapoport-lnx> In-Reply-To: <20190821071100.GA26713@rapoport-lnx> Accept-Language: zh-TW, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: DB8PR03CA0014.eurprd03.prod.outlook.com (2603:10a6:10:be::27) To BY5PR18MB3283.namprd18.prod.outlook.com (2603:10b6:a03:196::11) authentication-results: spf=none (sender IP is ) smtp.mailfrom=clin@suse.com; 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received-spf: None (protection.outlook.com: suse.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: V+3SmBcfEmgfd9Zlu4NUXu9CqqOVhgZNi+Z3JxTsdsvDUY6N4Vlyaf6JzWymeXD6r0EKQkIdhBWrOi7Gf1uhZuxM/RKGDVDM+lcyZe61HL6ZZabuSyTXOdYGfOXE0fv6Zp4znsrqFQrioFLr5rNpLbepTKQi8u+dVNxA4LoLHk652TSrQ1qclqnnOimhYHXkIJG12Gae00tfjVxalnnK5JLOtFxncEYLe08JRKFH6r7J+yG3NIDHz2h8gs2vrLAFv5x8ec+i3kh3PfW3V6O93IYrdK9P24jckfQuYYPv944oAU4/anil9uGcj5uEll5qXrBEL6VNp2QD5zTXoHLJNS8cCiQ7QZ9Kad0d4f/yI7Iug76jncU2KIG77pRzQN8VTbULTwRTrHtJTw21SHhbwsAQQxWZsX1KJl/oU3VWnbI= Content-Type: text/plain; charset="us-ascii" Content-ID: <89049C7AA5D24246A3058968A6556C2E@namprd18.prod.outlook.com> Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: 5ca4e210-2834-48f6-7585-08d7260862d0 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Aug 2019 07:22:55.7456 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 856b813c-16e5-49a5-85ec-6f081e13b527 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: BzonwTQMja6tOwccwt1UGrw3bCQKODZ+zAi3gyMLG6dlqpwUfAL2rHRpud2JAYaF X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR18MB3298 X-OriginatorOrg: suse.com Sender: linux-efi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org On Wed, Aug 21, 2019 at 10:11:01AM +0300, Mike Rapoport wrote: > On Wed, Aug 21, 2019 at 09:35:16AM +0300, Ard Biesheuvel wrote: > > On Wed, 21 Aug 2019 at 09:11, Chester Lin wrote: > > > > > > On Tue, Aug 20, 2019 at 03:28:25PM +0300, Ard Biesheuvel wrote: > > > > On Tue, 20 Aug 2019 at 14:56, Russell King - ARM Linux admin > > > > wrote: > > > > > > > > > > On Fri, Aug 02, 2019 at 05:38:54AM +0000, Chester Lin wrote: > > > > > > diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c > > > > > > index f3ce34113f89..909b11ba48d8 100644 > > > > > > --- a/arch/arm/mm/mmu.c > > > > > > +++ b/arch/arm/mm/mmu.c > > > > > > @@ -1184,6 +1184,9 @@ void __init adjust_lowmem_bounds(void) > > > > > > phys_addr_t block_start = reg->base; > > > > > > phys_addr_t block_end = reg->base + reg->size; > > > > > > > > > > > > + if (memblock_is_nomap(reg)) > > > > > > + continue; > > > > > > + > > > > > > if (reg->base < vmalloc_limit) { > > > > > > if (block_end > lowmem_limit) > > > > > > /* > > > > > > > > > > I think this hunk is sane - if the memory is marked nomap, then it isn't > > > > > available for the kernel's use, so as far as calculating where the > > > > > lowmem/highmem boundary is, it effectively doesn't exist and should be > > > > > skipped. > > > > > > > > > > > > > I agree. > > > > > > > > Chester, could you explain what you need beyond this change (and my > > > > EFI stub change involving TEXT_OFFSET) to make things work on the > > > > RPi2? > > > > > > > > > > Hi Ard, > > > > > > In fact I am working with Guillaume to try booting zImage kernel and openSUSE > > > from grub2.04 + arm32-efistub so that's why we get this issue on RPi2, which is > > > one of the test machines we have. However we want a better solution for all > > > cases but not just RPi2 since we don't want to affect other platforms as well. > > > > > > > Thanks Chester, but that doesn't answer my question. > > > > Your fix is a single patch that changes various things that are only > > vaguely related. We have already identified that we need to take > > TEXT_OFFSET (minus some space used by the swapper page tables) into > > account into the EFI stub if we want to ensure compatibility with many > > different platforms, and as it turns out, this applies not only to > > RPi2 but to other platforms as well, most notably the ones that > > require a TEXT_OFFSET of 0x208000, since they also have reserved > > regions at the base of RAM. > > > > My question was what else we need beyond: > > - the EFI stub TEXT_OFFSET fix [0] > > - the change to disregard NOMAP memblocks in adjust_lowmem_bounds() > > - what else??? > > I think the only missing part here is to ensure that non-reserved memory in > bank 0 starts from a PMD-aligned address. I believe this could be done if > EFI stub, but I'm not really familiar with it so this just a semi-educated > guess :) > > > [0] https://git.kernel.org/pub/scm/linux/kernel/git/efi/efi.git/commit/?h=next&id=0eb7bad595e52666b642a02862ad996a0f9bfcc0 > Hi Ard and Mike, Sorry for my misunderstanding and I agree with Mike. We could still meet the memblock_limit issue if there's a non-reserved memory in bank0 starts from an unaligned address. Regards, Chester