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b=cI9agDPgu/Ib4QkF3g4tu15WfOWIQC+0PwLPR3mnOPTMKQu4fawdHXg9XSl1ZEsDG yYQktlJbDsRA+aR6PVWdT2vckH+spyYFtRfQ6SILWkGAVjLrmn5iC39Y6oEpJbt5Jz nr10UKAQleQxnnYRRGdzXPNzxBRGF5fwieCv4sTtV+y1c+z4WJg06T0e/a96H4Z/Rz 87qF0uKkyhQDC84PUAqn5+k4UoDTNRI1wVnMVanFkF1HqpY/prZbffCpXqh64VaLMF Uq6BiZW/f5UtS2XI+0bG/IOStq+74reNwEeoidtjopFNaNVDnpAY9+YaTAYu8KegFA 6AVXWuLiQbDFQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1qJXbB-00CPrm-G9; Wed, 12 Jul 2023 12:01:33 +0100 Date: Wed, 12 Jul 2023 12:01:33 +0100 Message-ID: <861qhdwfzm.wl-maz@kernel.org> From: Marc Zyngier To: Linux regressions mailing list Cc: Sudeep Holla , Mostafa Saleh , oliver.upton@linux.dev, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, tabba@google.com, qperret@google.com, will@kernel.org, catalin.marinas@arm.com, yuzenghui@huawei.com, suzuki.poulose@arm.com, james.morse@arm.com, bgardon@google.com, gshan@redhat.com Subject: Re: [PATCH v3] KVM: arm64: Use BTI for nvhe In-Reply-To: <4da09faa-acb8-7262-b9ae-6cb327cff206@leemhuis.info> References: <20230530150845.2856828-1-smostafa@google.com> <20230704134136.a5znw4jupt5yp5kg@bogus> <55bffc21-5f19-765f-9dbc-1b565c880426@leemhuis.info> <864jm9wgsn.wl-maz@kernel.org> <4da09faa-acb8-7262-b9ae-6cb327cff206@leemhuis.info> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/28.2 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: regressions@lists.linux.dev, sudeep.holla@arm.com, smostafa@google.com, oliver.upton@linux.dev, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, tabba@google.com, qperret@google.com, will@kernel.org, catalin.marinas@arm.com, yuzenghui@huawei.com, suzuki.poulose@arm.com, james.morse@arm.com, bgardon@google.com, gshan@redhat.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230712_040137_198952_62A72E6E X-CRM114-Status: GOOD ( 31.03 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 12 Jul 2023 11:52:39 +0100, "Linux regression tracking (Thorsten Leemhuis)" wrote: > > On 12.07.23 12:44, Marc Zyngier wrote: > > On Wed, 12 Jul 2023 11:34:51 +0100, > > "Linux regression tracking (Thorsten Leemhuis)" wrote: > >> > >> [CCing the regression list, as it should be in the loop for regressions: > >> https://docs.kernel.org/admin-guide/reporting-regressions.html] > >> > >> [TLDR: I'm adding this report to the list of tracked Linux kernel > >> regressions; the text you find below is based on a few templates > >> paragraphs you might have encountered already in similar form. > >> See link in footer if these mails annoy you.] > >> > >> On 04.07.23 15:41, Sudeep Holla wrote: > >>> On Tue, May 30, 2023 at 03:08:45PM +0000, Mostafa Saleh wrote: > >>>> CONFIG_ARM64_BTI_KERNEL compiles the kernel to support ARMv8.5-BTI. > >>>> However, the nvhe code doesn't make use of it as it doesn't map any > >>>> pages with Guarded Page(GP) bit. > >>> [...] > >>> I was chasing a bug in linux-next yesterday with protected nVHE(pKVM) and > >>> cpuidle enabled. The system fails to boot. I just bisected the issue to this > >>> patch and also saw this patch landed in the linus tree yesterday/today. > >>> Not sure if this is something to do with the fact that pKVM skips to > >>> __kvm_handle_stub_hvc in __host_hvc. > >>> > >>> Let me know if you want be to try something. > >> > >> Thanks for the report. Seems the fix is slow to progress. > > > > It's not. See [1]. > > > > [1] https://lore.kernel.org/r/20230706152240.685684-1-smostafa@google.com > > I'm aware of that fix, as one of the regzbot commands in the mail your > quoted pointed to that mail. But unless I'm missing something that fix > is now nearly a week old and not yet in -next. That from my point of > view makes it "slow to progress" and trackworthy. Shoving stuff in -next early is not a guarantee of the fix being correct. Oddly enough, some of us value taking the time it takes to make sure the fix is correct and addresses the *full* issue, not only the reported corner case. I know, this is not trendy. Too bad. On top of that, we don't push fixes to -next either, so good luck tracking that. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel