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b=hZBpZNUrg+WBhFXfBIWt37i+gjg86AxbKm73Svq2hKwKoAtq2kFyb7gAnJSoXtPlH eXu5CThaPtsTsFVE28RTqFYK2OMcfYFZnyTlCKDtQcfsh+J2v509gV2LXH9CaT28di 9hq/RvHUscVTTgzjho+IkHwSZRCiuDUD/Of7Aea/su0zEGkbf2qRN6djZdeT6NI/ab MvHeQdPhHF8M76dK5paHxFXgRskVpGQu+SgX+3gbTOIpUv9H0AT1NF3YGaPi2byhSU 1BXE9WlWzg4MHqw9lD3KIMiAMT8vay6ouVuM9wx1UGzqbVtlvp8n32/akH6ztdgmSN ZfBC2NrNfPDoQ== 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 1qJXKK-00CPYB-Vi; Wed, 12 Jul 2023 11:44:09 +0100 Date: Wed, 12 Jul 2023 11:44:08 +0100 Message-ID: <864jm9wgsn.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: <55bffc21-5f19-765f-9dbc-1b565c880426@leemhuis.info> References: <20230530150845.2856828-1-smostafa@google.com> <20230704134136.a5znw4jupt5yp5kg@bogus> <55bffc21-5f19-765f-9dbc-1b565c880426@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_034414_046794_CBA4CC18 X-CRM114-Status: GOOD ( 26.82 ) 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 11:34:51 +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]. M. [1] https://lore.kernel.org/r/20230706152240.685684-1-smostafa@google.com -- 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