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Wed, 4 Aug 2021 15:53:11 +0000 From: Michael Kelley To: 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 Cc: mikelley@microsoft.com Subject: [PATCH v12 2/5] arm64: hyperv: Add panic handler Date: Wed, 4 Aug 2021 08:52:36 -0700 Message-Id: <1628092359-61351-3-git-send-email-mikelley@microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1628092359-61351-1-git-send-email-mikelley@microsoft.com> References: <1628092359-61351-1-git-send-email-mikelley@microsoft.com> Content-Type: text/plain X-ClientProxiedBy: CO2PR04CA0175.namprd04.prod.outlook.com (2603:10b6:104:4::29) To DM6PR21MB1514.namprd21.prod.outlook.com (2603:10b6:5:22d::11) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mhkdev.corp.microsoft.com (167.220.2.16) by CO2PR04CA0175.namprd04.prod.outlook.com (2603:10b6:104:4::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4394.15 via Frontend Transport; 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This code is built only when CONFIG_HYPERV is enabled. Signed-off-by: Michael Kelley Reviewed-by: Sunil Muthuswamy Reviewed-by: Boqun Feng Acked-by: Marc Zyngier Acked-by: Mark Rutland --- 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