From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhengqiang Subject: Re: [RFC/RFT PATCH 0/6] Switch GHES ioremap_page_range() to use fixmap Date: Thu, 9 Nov 2017 20:22:53 +0800 Message-ID: <5A04489D.2040201@huawei.com> References: <20171031153832.17746-1-james.morse@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit Return-path: Received: from szxga05-in.huawei.com ([45.249.212.191]:10045 "EHLO szxga05-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754241AbdKIMYn (ORCPT ); Thu, 9 Nov 2017 07:24:43 -0500 In-Reply-To: <20171031153832.17746-1-james.morse@arm.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: James Morse , linux-acpi@vger.kernel.org Cc: "Rafael J . Wysocki" , Tony Luck , Xie XiuQi , Tyler Baicar , Catalin Marinas , x86@kernel.org, Will Deacon , linux-kernel@vger.kernel.org, Dongjiu Geng , Ingo Molnar , "H . Peter Anvin" , Thomas Gleixner , Borislav Petkov , torvalds@linux-foundation.org, linux-arm-kernel@lists.infradead.org, Len Brown On 2017/10/31 23:38, James Morse wrote: > GHES is doing ioremap_page_range() in both NMI and irq context, neither > are safe as it may sleep to allocate intermediate levels of page table. > > Replace the NMI/irq GHES_IOREMAP_PAGES to use a fixmap entry each. > > After this nothing uses ghes_ioremap_area or arch_apei_flush_tlb_one(), > rip them out. > > RFC as I've only build-tested this on x86. For arm64 I've tested it on a > software model. Any more testing would be welcome. These patches are based > on rc7. > Tested-by: Qiang Zheng Verified on our arm64, it work for me. Thanks. Qiang