diff options
| author | Michael Kelley <mikelley@microsoft.com> | 2021-03-02 22:38:16 +0100 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-03-08 18:32:59 +0100 |
| commit | b548a7742791e7818bc2780b2354b9714fd8f8d9 (patch) | |
| tree | 6ff98b3df7d860d83f98e6155748bbfd915eed3b /drivers/hv | |
| parent | Drivers: hv: Redo Hyper-V synthetic MSR get/set functions (diff) | |
| download | linux-b548a7742791e7818bc2780b2354b9714fd8f8d9.tar.xz linux-b548a7742791e7818bc2780b2354b9714fd8f8d9.zip | |
Drivers: hv: vmbus: Move hyperv_report_panic_msg to arch neutral code
With the new Hyper-V MSR set function, hyperv_report_panic_msg() can be
architecture neutral, so move it out from under arch/x86 and merge into
hv_kmsg_dump(). This move also avoids needing a separate implementation
under arch/arm64.
No functional change.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Link: https://lore.kernel.org/r/1614721102-2241-5-git-send-email-mikelley@microsoft.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Diffstat (limited to 'drivers/hv')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 24 |
1 files changed, 19 insertions, 5 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 9e631705ddf6..7524d71a0f84 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -1392,22 +1392,36 @@ static void hv_kmsg_dump(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason) { size_t bytes_written; - phys_addr_t panic_pa; /* We are only interested in panics. */ if ((reason != KMSG_DUMP_PANIC) || (!sysctl_record_panic_msg)) return; - panic_pa = virt_to_phys(hv_panic_page); - /* * Write dump contents to the page. No need to synchronize; panic should * be single-threaded. */ kmsg_dump_get_buffer(dumper, false, hv_panic_page, HV_HYP_PAGE_SIZE, &bytes_written); - if (bytes_written) - hyperv_report_panic_msg(panic_pa, bytes_written); + if (!bytes_written) + return; + /* + * 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_register(HV_REGISTER_CRASH_P0, 0); + hv_set_register(HV_REGISTER_CRASH_P1, 0); + hv_set_register(HV_REGISTER_CRASH_P2, 0); + hv_set_register(HV_REGISTER_CRASH_P3, virt_to_phys(hv_panic_page)); + hv_set_register(HV_REGISTER_CRASH_P4, bytes_written); + + /* + * Let Hyper-V know there is crash data available along with + * the panic message. + */ + hv_set_register(HV_REGISTER_CRASH_CTL, + (HV_CRASH_CTL_CRASH_NOTIFY | HV_CRASH_CTL_CRASH_NOTIFY_MSG)); } static struct kmsg_dumper hv_kmsg_dumper = { |