From: Michael Kelley <mikelley@microsoft.com>
To: will@kernel.org, ardb@kernel.org, arnd@arndb.de,
catalin.marinas@arm.com, mark.rutland@arm.com, maz@kernel.org,
linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-efi@vger.kernel.org, linux-arch@vger.kernel.org,
olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com,
jasowang@redhat.com, marcelo.cerri@canonical.com,
kys@microsoft.com
Cc: mikelley@microsoft.com, sunilmut@microsoft.com, boqun.feng@gmail.com
Subject: [PATCH v6 06/10] arm64: hyperv: Add kexec and panic handlers
Date: Sat, 14 Mar 2020 08:35:15 -0700 [thread overview]
Message-ID: <1584200119-18594-7-git-send-email-mikelley@microsoft.com> (raw)
In-Reply-To: <1584200119-18594-1-git-send-email-mikelley@microsoft.com>
Add functions to set up and remove kexec and panic
handlers, and to inform Hyper-V about a guest panic.
These functions are called from architecture independent
code in the VMbus driver.
This code is built only when CONFIG_HYPERV is enabled.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
arch/arm64/hyperv/hv_core.c | 61 ++++++++++++++++++++++++++++++++++++++++++++
arch/arm64/hyperv/mshyperv.c | 26 +++++++++++++++++++
2 files changed, 87 insertions(+)
diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c
index 4aa6b8f..8d6de9f 100644
--- a/arch/arm64/hyperv/hv_core.c
+++ b/arch/arm64/hyperv/hv_core.c
@@ -199,3 +199,64 @@ void hv_get_vpreg_128(u32 msr, struct hv_get_vp_register_output *res)
kfree(output);
}
EXPORT_SYMBOL_GPL(hv_get_vpreg_128);
+
+void hyperv_report_panic(struct pt_regs *regs, long err)
+{
+ static bool panic_reported;
+ u64 guest_id;
+
+ /*
+ * 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'.
+ */
+ 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, and the PC.
+ * The first two general registers are added arbitrarily.
+ */
+ 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->regs[0]);
+ hv_set_vpreg(HV_REGISTER_CRASH_P4, regs->regs[1]);
+
+ /*
+ * 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);
+
+/*
+ * hyperv_report_panic_msg - report panic message to Hyper-V
+ * @pa: physical address of the panic page containing the message
+ * @size: size of the message in the page
+ */
+void hyperv_report_panic_msg(phys_addr_t pa, size_t size)
+{
+ /*
+ * P3 to contain the physical address of the panic page & P4 to
+ * contain the size of the panic data in that page. Rest of the
+ * registers are no-op when the NOTIFY_MSG flag is set.
+ */
+ hv_set_vpreg(HV_REGISTER_CRASH_P0, 0);
+ hv_set_vpreg(HV_REGISTER_CRASH_P1, 0);
+ hv_set_vpreg(HV_REGISTER_CRASH_P2, 0);
+ hv_set_vpreg(HV_REGISTER_CRASH_P3, pa);
+ hv_set_vpreg(HV_REGISTER_CRASH_P4, size);
+
+ /*
+ * Let Hyper-V know there is crash data available along with
+ * the panic message.
+ */
+ hv_set_vpreg(HV_REGISTER_CRASH_CTL,
+ (HV_CRASH_CTL_CRASH_NOTIFY | HV_CRASH_CTL_CRASH_NOTIFY_MSG));
+}
+EXPORT_SYMBOL_GPL(hyperv_report_panic_msg);
diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
index ae6ece6..c58940d 100644
--- a/arch/arm64/hyperv/mshyperv.c
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -23,6 +23,8 @@
static void (*vmbus_handler)(void);
static void (*hv_stimer0_handler)(void);
+static void (*hv_kexec_handler)(void);
+static void (*hv_crash_handler)(struct pt_regs *regs);
static int vmbus_irq;
static long __percpu *vmbus_evt;
@@ -137,3 +139,27 @@ void hv_remove_stimer0_irq(int irq)
}
}
EXPORT_SYMBOL_GPL(hv_remove_stimer0_irq);
+
+void hv_setup_kexec_handler(void (*handler)(void))
+{
+ hv_kexec_handler = handler;
+}
+EXPORT_SYMBOL_GPL(hv_setup_kexec_handler);
+
+void hv_remove_kexec_handler(void)
+{
+ hv_kexec_handler = NULL;
+}
+EXPORT_SYMBOL_GPL(hv_remove_kexec_handler);
+
+void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs))
+{
+ hv_crash_handler = handler;
+}
+EXPORT_SYMBOL_GPL(hv_setup_crash_handler);
+
+void hv_remove_crash_handler(void)
+{
+ hv_crash_handler = NULL;
+}
+EXPORT_SYMBOL_GPL(hv_remove_crash_handler);
--
1.8.3.1
next prev parent reply other threads:[~2020-03-15 1:32 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-14 15:35 [PATCH v6 00/10] Subject: Enable Linux guests on Hyper-V on ARM64 Michael Kelley
2020-03-14 15:35 ` [PATCH v6 01/10] arm64: hyperv: Add core Hyper-V include files Michael Kelley
2020-03-15 17:31 ` Marc Zyngier
2020-03-18 0:10 ` Michael Kelley
2020-03-16 8:47 ` Arnd Bergmann
2020-03-18 0:12 ` Michael Kelley
2020-03-18 10:10 ` Arnd Bergmann
2020-03-19 21:31 ` Michael Kelley
2020-03-20 16:38 ` Arnd Bergmann
2020-03-14 15:35 ` [PATCH v6 02/10] arm/arm64: smccc-1.1: Add vendor specific owner definition Michael Kelley
2020-03-14 15:35 ` [PATCH v6 03/10] arm64: hyperv: Add hypercall and register access functions Michael Kelley
2020-03-14 15:35 ` [PATCH v6 04/10] arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages Michael Kelley
2020-03-16 8:22 ` Arnd Bergmann
2020-03-16 8:30 ` gregkh
2020-03-16 8:30 ` Marc Zyngier
2020-03-16 8:32 ` Arnd Bergmann
2020-03-18 0:15 ` Michael Kelley
2020-03-18 9:57 ` Arnd Bergmann
2020-03-19 21:43 ` Michael Kelley
2020-03-20 16:28 ` Arnd Bergmann
2020-03-20 17:22 ` Michael Kelley
2020-03-14 15:35 ` [PATCH v6 05/10] arm64: hyperv: Add interrupt handlers for VMbus and stimer Michael Kelley
2020-03-16 8:25 ` Arnd Bergmann
2020-03-18 0:16 ` Michael Kelley
2020-03-18 9:52 ` Arnd Bergmann
2020-03-14 15:35 ` Michael Kelley [this message]
2020-03-15 18:15 ` [PATCH v6 06/10] arm64: hyperv: Add kexec and panic handlers Marc Zyngier
2020-03-18 0:17 ` Michael Kelley
2020-03-14 15:35 ` [PATCH v6 07/10] arm64: hyperv: Initialize hypervisor on boot Michael Kelley
2020-03-16 8:29 ` Arnd Bergmann
2020-03-18 0:17 ` Michael Kelley
2020-03-18 9:44 ` Arnd Bergmann
2020-03-14 15:35 ` [PATCH v6 08/10] Drivers: hv: vmbus: Add hooks for per-CPU IRQ Michael Kelley
2020-03-14 15:35 ` [PATCH v6 09/10] arm64: efi: Export screen_info Michael Kelley
2020-03-16 8:20 ` Arnd Bergmann
2020-03-18 0:18 ` Michael Kelley
2020-03-18 9:26 ` Arnd Bergmann
2020-03-19 21:46 ` Michael Kelley
2020-05-13 14:26 ` Nikhil Mahale
2020-05-18 4:25 ` Nikhil Mahale
2020-05-18 12:51 ` Ard Biesheuvel
2020-05-22 11:14 ` Nikhil Mahale
2020-05-22 11:32 ` Ard Biesheuvel
2020-03-14 15:35 ` [PATCH v6 10/10] Drivers: hv: Enable Hyper-V code to be built on ARM64 Michael Kelley
[not found] ` <20200318031130.5476-1-hdanton@sina.com>
2020-03-19 21:04 ` [PATCH v6 03/10] arm64: hyperv: Add hypercall and register access functions Michael Kelley
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