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@xxxxxxxxxxxxx>
Reviewed-by: Boqun Feng <boqun.feng@xxxxxxxxx>
---
arch/x86/hyperv/hv_init.c | 27 ---------------------------
drivers/hv/vmbus_drv.c | 24 +++++++++++++++++++-----
include/asm-generic/mshyperv.h | 1 -
3 files changed, 19 insertions(+), 33 deletions(-)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 94d52c5..9af4f8a 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -571,33 +571,6 @@ void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die)
}
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.
- */
- wrmsrl(HV_X64_MSR_CRASH_P0, 0);
- wrmsrl(HV_X64_MSR_CRASH_P1, 0);
- wrmsrl(HV_X64_MSR_CRASH_P2, 0);
- wrmsrl(HV_X64_MSR_CRASH_P3, pa);
- wrmsrl(HV_X64_MSR_CRASH_P4, size);
-
- /*
- * Let Hyper-V know there is crash data available along with
- * the panic message.
- */
- wrmsrl(HV_X64_MSR_CRASH_CTL,
- (HV_CRASH_CTL_CRASH_NOTIFY | HV_CRASH_CTL_CRASH_NOTIFY_MSG));
-}
-EXPORT_SYMBOL_GPL(hyperv_report_panic_msg);
-
bool hv_is_hyperv_initialized(void)
{
union hv_x64_msr_hypercall_contents hypercall_msr;
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 9e63170..7524d71 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 = {
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index 163d8b0..70b798d 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -173,7 +173,6 @@ static inline int cpumask_to_vpset(struct hv_vpset *vpset,
}
void hyperv_report_panic(struct pt_regs *regs, long err, bool in_die);
-void hyperv_report_panic_msg(phys_addr_t pa, size_t size);
bool hv_is_hyperv_initialized(void);
bool hv_is_hibernation_supported(void);
enum hv_isolation_type hv_get_isolation_type(void);
--
1.8.3.1
