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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 9656CC636C9 for ; Wed, 21 Jul 2021 14:56:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A27361245 for ; Wed, 21 Jul 2021 14:56:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239380AbhGUOQO (ORCPT ); Wed, 21 Jul 2021 10:16:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239317AbhGUOQB (ORCPT ); Wed, 21 Jul 2021 10:16:01 -0400 Received: from mail-io1-xd2e.google.com (mail-io1-xd2e.google.com [IPv6:2607:f8b0:4864:20::d2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79A55C061575; Wed, 21 Jul 2021 07:56:37 -0700 (PDT) Received: by mail-io1-xd2e.google.com with SMTP id l5so2662226iok.7; Wed, 21 Jul 2021 07:56:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=J9GXO25yH99ijG3XbaBRz1X0sXh/ONbHUAdBNJQ2uQA=; b=Ox9tULYe6v8F+etXsBGnVP3ZxagjDPkPoE3e2Owy8q9dgWg8g7N7BBtrRQGvWFBr+6 1DWnyRpCtzw8pSfNr9LhYV0FvVRySbzwR9Xct6LYLyJP2J7Q3sFcAEvDsmMybK7CYgvj wRnNAeDCTSfATzudZdTulAqJpXsyF1UvCqkDQck8iZV0s+D62hCPLCVZrr+9Sf7MgN91 FzK2m+IyV8440MGHYwMhQTlL3qK6+KsbJA11y3y6TdK83Ioh6TMDtnlvyjQc1h4OU/tF t5tK8W1d8KZuZJYuXuvSFlti+PMn6KoQu2lwzwfZYnFtpr8Ql2pcf4dDjFyKSY4AgXyn kGjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=J9GXO25yH99ijG3XbaBRz1X0sXh/ONbHUAdBNJQ2uQA=; b=h528Bp4eNLM9P8E3EepCqUR55r/lXSI7zCs9AhG03krzMzCgQWft5i7HKDam7rw9Ps H2oZdUiEV4z85InCwbdu23nS2PIFwiDS035XaK1aiLkq09RS5Mq1zTbSC1C4c9EpyDXJ NltIo/4jNL/u2w0E8zwNo2VaJrvs1qUylkBW7hGIARmY3zrmxHEFztuh9MrzlQz57dF7 8Nwt6zYVbUate74YX9cwZv545PO74/caYDewKVZPjHptt+KmoOWiuCEbsd9gtrajNEhx XapEybN5sHb1Pc7fO77fcDddr94DTKxxSsTzJMgCcqOz0FJsJQkd7czr3NmSooBi9MYj 440Q== X-Gm-Message-State: AOAM531jyur+K2fZiM+CprDLSAMZ6DnRKR1lfxb0vatQYAmat8XhH6Kc vqgiyZKHckQ3mChyZttNAro= X-Google-Smtp-Source: ABdhPJy7aOJWXiamd0Hlkl05QP+ZmCotvUqMDQL5gZVtwmyHFcb0CCzl9EIhAYopnrV/hlnp5ZOaBg== X-Received: by 2002:a5d:9f11:: with SMTP id q17mr25728474iot.62.1626879397039; Wed, 21 Jul 2021 07:56:37 -0700 (PDT) Received: from auth2-smtp.messagingengine.com (auth2-smtp.messagingengine.com. [66.111.4.228]) by smtp.gmail.com with ESMTPSA id d9sm5457443ilv.62.2021.07.21.07.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 07:56:36 -0700 (PDT) Received: from compute2.internal (compute2.nyi.internal [10.202.2.42]) by mailauth.nyi.internal (Postfix) with ESMTP id E0B6427C005A; Wed, 21 Jul 2021 10:56:35 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Wed, 21 Jul 2021 10:56:35 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddrfeeggdejhecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpeffhffvuffkfhggtggujgesthdtredttddtvdenucfhrhhomhepuehoqhhunhcu hfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrghtth gvrhhnpedvleeigedugfegveejhfejveeuveeiteejieekvdfgjeefudehfefhgfegvdeg jeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegsoh hquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdeiledvgeehtdeigedq udejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgrihhlrdgtohhmsehfihigmh gvrdhnrghmvg X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 21 Jul 2021 10:56:34 -0400 (EDT) Date: Wed, 21 Jul 2021 22:54:36 +0800 From: Boqun Feng To: Michael Kelley Cc: will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, wei.liu@kernel.org, kys@microsoft.com, sthemmin@microsoft.com, ardb@kernel.org Subject: Re: [PATCH v11 2/5] arm64: hyperv: Add panic handler Message-ID: References: <1626793023-13830-1-git-send-email-mikelley@microsoft.com> <1626793023-13830-3-git-send-email-mikelley@microsoft.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1626793023-13830-3-git-send-email-mikelley@microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 20, 2021 at 07:57:00AM -0700, Michael Kelley wrote: > Add a function to inform Hyper-V about a guest panic. > > This code is built only when CONFIG_HYPERV is enabled. > > Signed-off-by: Michael Kelley Reviewed-by: Boqun Feng Regards, Boqun > --- > arch/arm64/hyperv/hv_core.c | 52 +++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 52 insertions(+) > > diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c > index 4c5dc0f..b54c347 100644 > --- a/arch/arm64/hyperv/hv_core.c > +++ b/arch/arm64/hyperv/hv_core.c > @@ -127,3 +127,55 @@ u64 hv_get_vpreg(u32 msr) > return output.as64.low; > } > EXPORT_SYMBOL_GPL(hv_get_vpreg); > + > +/* > + * hyperv_report_panic - report a panic to Hyper-V. This function uses > + * the older version of the Hyper-V interface that admittedly doesn't > + * pass enough information to be useful beyond just recording the > + * occurrence of a panic. The parallel hv_kmsg_dump() uses the > + * new interface that allows reporting 4 Kbytes of data, which is much > + * more useful. Hyper-V on ARM64 always supports the newer interface, but > + * we retain support for the older version because the sysadmin is allowed > + * to disable the newer version via sysctl in case of information security > + * concerns about the more verbose version. > + */ > +void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die) > +{ > + static bool panic_reported; > + u64 guest_id; > + > + /* Don't report a panic to Hyper-V if we're not going to panic */ > + if (in_die && !panic_on_oops) > + return; > + > + /* > + * We prefer to report panic on 'die' chain as we have proper > + * registers to report, but if we miss it (e.g. on BUG()) we need > + * to report it on 'panic'. > + * > + * Calling code in the 'die' and 'panic' paths ensures that only > + * one CPU is running this code, so no atomicity is needed. > + */ > + if (panic_reported) > + return; > + panic_reported = true; > + > + guest_id = hv_get_vpreg(HV_REGISTER_GUEST_OSID); > + > + /* > + * Hyper-V provides the ability to store only 5 values. > + * Pick the passed in error value, the guest_id, the PC, > + * and the SP. > + */ > + hv_set_vpreg(HV_REGISTER_CRASH_P0, err); > + hv_set_vpreg(HV_REGISTER_CRASH_P1, guest_id); > + hv_set_vpreg(HV_REGISTER_CRASH_P2, regs->pc); > + hv_set_vpreg(HV_REGISTER_CRASH_P3, regs->sp); > + hv_set_vpreg(HV_REGISTER_CRASH_P4, 0); > + > + /* > + * Let Hyper-V know there is crash data available > + */ > + hv_set_vpreg(HV_REGISTER_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); > +} > +EXPORT_SYMBOL_GPL(hyperv_report_panic); > -- > 1.8.3.1 > 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=-10.8 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 C057AC636C9 for ; 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[66.111.4.228]) by smtp.gmail.com with ESMTPSA id d9sm5457443ilv.62.2021.07.21.07.56.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 07:56:36 -0700 (PDT) Received: from compute2.internal (compute2.nyi.internal [10.202.2.42]) by mailauth.nyi.internal (Postfix) with ESMTP id E0B6427C005A; Wed, 21 Jul 2021 10:56:35 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Wed, 21 Jul 2021 10:56:35 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddrfeeggdejhecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpeffhffvuffkfhggtggujgesthdtredttddtvdenucfhrhhomhepuehoqhhunhcu hfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrghtth gvrhhnpedvleeigedugfegveejhfejveeuveeiteejieekvdfgjeefudehfefhgfegvdeg jeenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegsoh hquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdeiledvgeehtdeigedq udejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgrihhlrdgtohhmsehfihigmh gvrdhnrghmvg X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 21 Jul 2021 10:56:34 -0400 (EDT) Date: Wed, 21 Jul 2021 22:54:36 +0800 From: Boqun Feng To: Michael Kelley Cc: will@kernel.org, catalin.marinas@arm.com, mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, wei.liu@kernel.org, kys@microsoft.com, sthemmin@microsoft.com, ardb@kernel.org Subject: Re: [PATCH v11 2/5] arm64: hyperv: Add panic handler Message-ID: References: <1626793023-13830-1-git-send-email-mikelley@microsoft.com> <1626793023-13830-3-git-send-email-mikelley@microsoft.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1626793023-13830-3-git-send-email-mikelley@microsoft.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210721_075638_266559_A7CA0E60 X-CRM114-Status: GOOD ( 29.42 ) 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 Tue, Jul 20, 2021 at 07:57:00AM -0700, Michael Kelley wrote: > Add a function to inform Hyper-V about a guest panic. > > This code is built only when CONFIG_HYPERV is enabled. > > Signed-off-by: Michael Kelley Reviewed-by: Boqun Feng Regards, Boqun > --- > arch/arm64/hyperv/hv_core.c | 52 +++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 52 insertions(+) > > diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c > index 4c5dc0f..b54c347 100644 > --- a/arch/arm64/hyperv/hv_core.c > +++ b/arch/arm64/hyperv/hv_core.c > @@ -127,3 +127,55 @@ u64 hv_get_vpreg(u32 msr) > return output.as64.low; > } > EXPORT_SYMBOL_GPL(hv_get_vpreg); > + > +/* > + * hyperv_report_panic - report a panic to Hyper-V. This function uses > + * the older version of the Hyper-V interface that admittedly doesn't > + * pass enough information to be useful beyond just recording the > + * occurrence of a panic. The parallel hv_kmsg_dump() uses the > + * new interface that allows reporting 4 Kbytes of data, which is much > + * more useful. Hyper-V on ARM64 always supports the newer interface, but > + * we retain support for the older version because the sysadmin is allowed > + * to disable the newer version via sysctl in case of information security > + * concerns about the more verbose version. > + */ > +void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die) > +{ > + static bool panic_reported; > + u64 guest_id; > + > + /* Don't report a panic to Hyper-V if we're not going to panic */ > + if (in_die && !panic_on_oops) > + return; > + > + /* > + * We prefer to report panic on 'die' chain as we have proper > + * registers to report, but if we miss it (e.g. on BUG()) we need > + * to report it on 'panic'. > + * > + * Calling code in the 'die' and 'panic' paths ensures that only > + * one CPU is running this code, so no atomicity is needed. > + */ > + if (panic_reported) > + return; > + panic_reported = true; > + > + guest_id = hv_get_vpreg(HV_REGISTER_GUEST_OSID); > + > + /* > + * Hyper-V provides the ability to store only 5 values. > + * Pick the passed in error value, the guest_id, the PC, > + * and the SP. > + */ > + hv_set_vpreg(HV_REGISTER_CRASH_P0, err); > + hv_set_vpreg(HV_REGISTER_CRASH_P1, guest_id); > + hv_set_vpreg(HV_REGISTER_CRASH_P2, regs->pc); > + hv_set_vpreg(HV_REGISTER_CRASH_P3, regs->sp); > + hv_set_vpreg(HV_REGISTER_CRASH_P4, 0); > + > + /* > + * Let Hyper-V know there is crash data available > + */ > + hv_set_vpreg(HV_REGISTER_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); > +} > +EXPORT_SYMBOL_GPL(hyperv_report_panic); > -- > 1.8.3.1 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel