linux-kernel - Re: [PATCH hyperv-next v4 10/16] Drivers: hv: Rename the SynIC enable and disable routines

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Message-ID: <CAMvTesADrxV4vwU_mqYygm1bE39PKLZaaL-wLPT8snATRVkwNg@mail.gmail.com>
Date: Fri, 25 Jul 2025 19:21:42 +0800
From: Tianyu Lan <ltykernel@...il.com>
To: Roman Kisel <romank@...ux.microsoft.com>
Cc: alok.a.tiwari@...cle.com, arnd@...db.de, bp@...en8.de, corbet@....net, 
	dave.hansen@...ux.intel.com, decui@...rosoft.com, haiyangz@...rosoft.com, 
	hpa@...or.com, kys@...rosoft.com, mhklinux@...look.com, mingo@...hat.com, 
	rdunlap@...radead.org, tglx@...utronix.de, Tianyu.Lan@...rosoft.com, 
	wei.liu@...nel.org, linux-arch@...r.kernel.org, linux-coco@...ts.linux.dev, 
	linux-doc@...r.kernel.org, linux-hyperv@...r.kernel.org, 
	linux-kernel@...r.kernel.org, x86@...nel.org, apais@...rosoft.com, 
	benhill@...rosoft.com, bperkins@...rosoft.com, sunilmut@...rosoft.com
Subject: Re: [PATCH hyperv-next v4 10/16] Drivers: hv: Rename the SynIC enable
 and disable routines

On Tue, Jul 15, 2025 at 6:16 AM Roman Kisel <romank@...ux.microsoft.com> wrote:
>
> The confidential VMBus requires support for the both hypervisor
> facing SynIC and the paravisor one.
>
> Rename the functions that enable and disable SynIC with the
> hypervisor. No functional changes.
>
> Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
> ---
>  drivers/hv/channel_mgmt.c |  2 +-
>  drivers/hv/hv.c           | 11 ++++++-----
>  drivers/hv/hyperv_vmbus.h |  4 ++--
>  drivers/hv/vmbus_drv.c    |  6 +++---
>  4 files changed, 12 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index 6f87220e2ca3..ca2fe10c110a 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -845,7 +845,7 @@ static void vmbus_wait_for_unload(void)
>                         /*
>                          * In a CoCo VM the hyp_synic_message_page is not allocated
>                          * in hv_synic_alloc(). Instead it is set/cleared in
> -                        * hv_synic_enable_regs() and hv_synic_disable_regs()
> +                        * hv_hyp_synic_enable_regs() and hv_hyp_synic_disable_regs()
>                          * such that it is set only when the CPU is online. If
>                          * not all present CPUs are online, the message page
>                          * might be NULL, so skip such CPUs.
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index a8669843c56e..94a81bb3c8c7 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -266,9 +266,10 @@ void hv_synic_free(void)
>  }
>
>  /*
> - * hv_synic_enable_regs - Initialize the Synthetic Interrupt Controller.
> + * hv_hyp_synic_enable_regs - Initialize the Synthetic Interrupt Controller
> + * with the hypervisor.
>   */
> -void hv_synic_enable_regs(unsigned int cpu)
> +void hv_hyp_synic_enable_regs(unsigned int cpu)
>  {
>         struct hv_per_cpu_context *hv_cpu =
>                 per_cpu_ptr(hv_context.cpu_context, cpu);
> @@ -334,14 +335,14 @@ void hv_synic_enable_regs(unsigned int cpu)
>
>  int hv_synic_init(unsigned int cpu)
>  {
> -       hv_synic_enable_regs(cpu);
> +       hv_hyp_synic_enable_regs(cpu);
>
>         hv_stimer_legacy_init(cpu, VMBUS_MESSAGE_SINT);
>
>         return 0;
>  }
>
> -void hv_synic_disable_regs(unsigned int cpu)
> +void hv_hyp_synic_disable_regs(unsigned int cpu)
>  {
>         struct hv_per_cpu_context *hv_cpu =
>                 per_cpu_ptr(hv_context.cpu_context, cpu);
> @@ -528,7 +529,7 @@ int hv_synic_cleanup(unsigned int cpu)
>  always_cleanup:
>         hv_stimer_legacy_cleanup(cpu);
>
> -       hv_synic_disable_regs(cpu);
> +       hv_hyp_synic_disable_regs(cpu);
>
>         return ret;
>  }
> diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
> index 16b5cf1bca19..2873703d08a9 100644
> --- a/drivers/hv/hyperv_vmbus.h
> +++ b/drivers/hv/hyperv_vmbus.h
> @@ -189,10 +189,10 @@ extern int hv_synic_alloc(void);
>
>  extern void hv_synic_free(void);
>
> -extern void hv_synic_enable_regs(unsigned int cpu);
> +extern void hv_hyp_synic_enable_regs(unsigned int cpu);
>  extern int hv_synic_init(unsigned int cpu);
>
> -extern void hv_synic_disable_regs(unsigned int cpu);
> +extern void hv_hyp_synic_disable_regs(unsigned int cpu);
>  extern int hv_synic_cleanup(unsigned int cpu);
>
>  /* Interface */
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 72940a64b0b6..13aca5abc7d8 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -2809,7 +2809,7 @@ static void hv_crash_handler(struct pt_regs *regs)
>          */
>         cpu = smp_processor_id();
>         hv_stimer_cleanup(cpu);
> -       hv_synic_disable_regs(cpu);
> +       hv_hyp_synic_disable_regs(cpu);
>  };
>
>  static int hv_synic_suspend(void)
> @@ -2834,14 +2834,14 @@ static int hv_synic_suspend(void)
>          * interrupts-disabled context.
>          */
>
> -       hv_synic_disable_regs(0);
> +       hv_hyp_synic_disable_regs(0);
>
>         return 0;
>  }
>
>  static void hv_synic_resume(void)
>  {
> -       hv_synic_enable_regs(0);
> +       hv_hyp_synic_enable_regs(0);
>
>         /*
>          * Note: we don't need to call hv_stimer_init(0), because the timer
> --
> 2.43.0
>
>

Reviewed-by: Tianyu Lan <tiala@...rosoft.com>
-- 
Thanks
Tianyu Lan