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Drivers: hv: vmbus: Move hyperv_report_panic_msg to arch neutral code

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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>
This commit is contained in:
Michael Kelley 2021-03-02 13:38:16 -08:00 committed by Wei Liu
parent f3c5e63c36
commit b548a77427
3 changed files with 19 additions and 33 deletions
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27
arch/x86/hyperv/hv_init.c
View File

@ -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;

24
drivers/hv/vmbus_drv.c
View File

@ -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 = {

1
include/asm-generic/mshyperv.h
View File

@ -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);