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SubjectRe: [PATCH 04/10] Drivers: hv: vmbus: Move hyperv_report_panic_msg to arch neutral code
On Wed, Jan 27, 2021 at 12:23:39PM -0800, Michael Kelley wrote:
> 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>

Regards,
Boqun

> ---
> 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 9b2cdbe..22e9557 100644
> --- a/arch/x86/hyperv/hv_init.c
> +++ b/arch/x86/hyperv/hv_init.c
> @@ -452,33 +452,6 @@ 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 089f165..8affe68 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -1365,22 +1365,36 @@ 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 10c97a9..6a8072f 100644
> --- a/include/asm-generic/mshyperv.h
> +++ b/include/asm-generic/mshyperv.h
> @@ -170,7 +170,6 @@ 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);
> void hyperv_cleanup(void);
> --
> 1.8.3.1
>

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