diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index b055e53bbc6e59ed0bf398effae8e0300323ccb0..88af4ec559c42c4d0fd4472783771446b800b922 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -49,6 +49,17 @@ enum hv_cpuid_function { HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005, }; +#define HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE 0x400 + +#define HV_X64_MSR_CRASH_P0 0x40000100 +#define HV_X64_MSR_CRASH_P1 0x40000101 +#define HV_X64_MSR_CRASH_P2 0x40000102 +#define HV_X64_MSR_CRASH_P3 0x40000103 +#define HV_X64_MSR_CRASH_P4 0x40000104 +#define HV_X64_MSR_CRASH_CTL 0x40000105 + +#define HV_CRASH_CTL_CRASH_NOTIFY 0x8000000000000000 + /* Define version of the synthetic interrupt controller. */ #define HV_SYNIC_VERSION (1) diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 2b7b51d264f1b8269f33cee9c427195d23e46ba2..526fa8b19cda12ccc961aaecfbeec92082499533 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -37,6 +37,8 @@ #include #include #include +#include +#include #include "hyperv_vmbus.h" static struct acpi_device *hv_acpi_dev; @@ -45,6 +47,31 @@ static struct tasklet_struct msg_dpc; static struct completion probe_event; static int irq; + +int hyperv_panic_event(struct notifier_block *nb, + unsigned long event, void *ptr) +{ + struct pt_regs *regs; + + regs = current_pt_regs(); + + wrmsrl(HV_X64_MSR_CRASH_P0, regs->ip); + wrmsrl(HV_X64_MSR_CRASH_P1, regs->ax); + wrmsrl(HV_X64_MSR_CRASH_P2, regs->bx); + wrmsrl(HV_X64_MSR_CRASH_P3, regs->cx); + wrmsrl(HV_X64_MSR_CRASH_P4, regs->dx); + + /* + * Let Hyper-V know there is crash data available + */ + wrmsrl(HV_X64_MSR_CRASH_CTL, HV_CRASH_CTL_CRASH_NOTIFY); + return NOTIFY_DONE; +} + +static struct notifier_block hyperv_panic_block = { + .notifier_call = hyperv_panic_event, +}; + struct resource hyperv_mmio = { .name = "hyperv mmio", .flags = IORESOURCE_MEM, @@ -795,6 +822,15 @@ static int vmbus_bus_init(int irq) goto err_alloc; hv_cpu_hotplug_quirk(true); + + /* + * Only register if the crash MSRs are available + */ + if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) { + atomic_notifier_chain_register(&panic_notifier_list, + &hyperv_panic_block); + } + vmbus_request_offers(); return 0;