From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01DDAC43381 for ; Thu, 14 Feb 2019 15:48:15 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C2FFA218FF for ; Thu, 14 Feb 2019 15:48:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="KByUSCy+" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C2FFA218FF Authentication-Results: mail.kernel.org; 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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1guJFA-0001u8-0z; Thu, 14 Feb 2019 15:48:08 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1guJF4-0001td-7J for linux-arm-kernel@lists.infradead.org; Thu, 14 Feb 2019 15:48:05 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 14010EBD; Thu, 14 Feb 2019 07:48:01 -0800 (PST) Received: from [10.1.196.62] (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id AD0BA3F575; Thu, 14 Feb 2019 07:47:59 -0800 (PST) Subject: Re: [PATCH 1/2] arm64: account for GICv3 LPI tables in static memblock reserve table To: Ard Biesheuvel , linux-efi@vger.kernel.org References: <20190213132738.10294-1-ard.biesheuvel@linaro.org> <20190213132738.10294-2-ard.biesheuvel@linaro.org> From: Marc Zyngier Openpgp: preference=signencrypt Autocrypt: addr=marc.zyngier@arm.com; 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Linux aarch64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <20190213132738.10294-2-ard.biesheuvel@linaro.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190214_074804_030758_AA568372 X-CRM114-Status: GOOD ( 27.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Will Deacon , linux-mm@kvack.org, James Morse , Andrew Morton , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Ard, On 13/02/2019 13:27, Ard Biesheuvel wrote: > In the irqchip and EFI code, we have what basically amounts to a quirk > to work around a peculiarity in the GICv3 architecture, which permits > the system memory address of LPI tables to be programmable only once > after a CPU reset. This means kexec kernels must use the same memory > as the first kernel, and thus ensure that this memory has not been > given out for other purposes by the time the ITS init code runs, which > is not very early for secondary CPUs. > > On systems with many CPUs, these reservations could overflow the > memblock reservation table, and this was addressed in commit > eff896288872 ("efi/arm: Defer persistent reservations until after > paging_init()"). However, this turns out to have made things worse, > since the allocation of page tables and heap space for the resized > memblock reservation table itself may overwrite the regions we are > attempting to reserve, which may cause all kinds of corruption, > also considering that the ITS will still be poking bits into that > memory in response to incoming MSIs. > > So instead, let's grow the static memblock reservation table on such > systems so it can accommodate these reservations at an earlier time. > This will permit us to revert the above commit in a subsequent patch. > > Signed-off-by: Ard Biesheuvel > --- > arch/arm64/include/asm/memory.h | 11 +++++++++++ > include/linux/memblock.h | 3 --- > mm/memblock.c | 10 ++++++++-- > 3 files changed, 19 insertions(+), 5 deletions(-) > > diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h > index e1ec947e7c0c..7e2b13cdd970 100644 > --- a/arch/arm64/include/asm/memory.h > +++ b/arch/arm64/include/asm/memory.h > @@ -332,6 +332,17 @@ static inline void *phys_to_virt(phys_addr_t x) > #define virt_addr_valid(kaddr) \ > (_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr)) > > +/* > + * Given that the GIC architecture permits ITS implementations that can only be > + * configured with a LPI table address once, GICv3 systems with many CPUs may > + * end up reserving a lot of different regions after a kexec for their LPI > + * tables, as we are forced to reuse the same memory after kexec (and thus > + * reserve it persistently with EFI beforehand) > + */ > +#if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS) > +#define INIT_MEMBLOCK_RESERVED_REGIONS (INIT_MEMBLOCK_REGIONS + 2 * NR_CPUS) Since GICv3 has 1 pending table per CPU, plus one global property table, can we make this 2 * NR_CPUS + 1? Or is that enough already? > +#endif > + > #include > > #endif > diff --git a/include/linux/memblock.h b/include/linux/memblock.h > index 64c41cf45590..859b55b66db2 100644 > --- a/include/linux/memblock.h > +++ b/include/linux/memblock.h > @@ -29,9 +29,6 @@ extern unsigned long max_pfn; > */ > extern unsigned long long max_possible_pfn; > > -#define INIT_MEMBLOCK_REGIONS 128 > -#define INIT_PHYSMEM_REGIONS 4 > - > /** > * enum memblock_flags - definition of memory region attributes > * @MEMBLOCK_NONE: no special request > diff --git a/mm/memblock.c b/mm/memblock.c > index 022d4cbb3618..a526c3ab8390 100644 > --- a/mm/memblock.c > +++ b/mm/memblock.c > @@ -26,6 +26,12 @@ > > #include "internal.h" > > +#define INIT_MEMBLOCK_REGIONS 128 > +#define INIT_PHYSMEM_REGIONS 4 > +#ifndef INIT_MEMBLOCK_RESERVED_REGIONS > +#define INIT_MEMBLOCK_RESERVED_REGIONS INIT_MEMBLOCK_REGIONS > +#endif > + > /** > * DOC: memblock overview > * > @@ -92,7 +98,7 @@ unsigned long max_pfn; > unsigned long long max_possible_pfn; > > static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; > -static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; > +static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_RESERVED_REGIONS] __initdata_memblock; > #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP > static struct memblock_region memblock_physmem_init_regions[INIT_PHYSMEM_REGIONS] __initdata_memblock; > #endif > @@ -105,7 +111,7 @@ struct memblock memblock __initdata_memblock = { > > .reserved.regions = memblock_reserved_init_regions, > .reserved.cnt = 1, /* empty dummy entry */ > - .reserved.max = INIT_MEMBLOCK_REGIONS, > + .reserved.max = INIT_MEMBLOCK_RESERVED_REGIONS, > .reserved.name = "reserved", > > #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP > Otherwise: Acked-by: Marc Zyngier M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel