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Message-ID: <d8e4a38a-a7e2-1915-0b95-ac4dadf5c3dc@linux.intel.com>
Date: Tue, 8 Feb 2022 10:40:14 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Fenghua Yu <fenghua.yu@...el.com>,
Thomas Gleixner <tglx@...utronix.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>,
Tony Luck <tony.luck@...el.com>,
Joerg Roedel <joro@...tes.org>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
Ashok Raj <ashok.raj@...el.com>,
Ravi V Shankar <ravi.v.shankar@...el.com>
Cc: baolu.lu@...ux.intel.com, iommu@...ts.linux-foundation.org,
x86 <x86@...nel.org>, linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 02/11] mm: Change CONFIG option for mm->pasid field
On 2/8/22 7:02 AM, Fenghua Yu wrote:
> This currently depends on CONFIG_IOMMU_SUPPORT. But it is only
> needed when CONFIG_IOMMU_SVA option is enabled.
>
> Change the CONFIG guards around definition and initialization
> of mm->pasid field.
>
> Suggested-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> ---
> v4:
> - Add "Reviewed-by: Thomas Gleixner <tglx@...utronix.de>" (Thomas).
>
> v2:
> - Change condition to more accurate CONFIG_IOMMU_SVA (Jacob and Tony)
>
> include/linux/mm_types.h | 2 +-
> kernel/fork.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 5140e5feb486..c5cbfd7915ad 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -631,7 +631,7 @@ struct mm_struct {
> #endif
> struct work_struct async_put_work;
>
> -#ifdef CONFIG_IOMMU_SUPPORT
> +#ifdef CONFIG_IOMMU_SVA
> u32 pasid;
> #endif
> } __randomize_layout;
> diff --git a/kernel/fork.c b/kernel/fork.c
> index d75a528f7b21..6ee7551d3bd2 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -1021,7 +1021,7 @@ static void mm_init_owner(struct mm_struct *mm, struct task_struct *p)
>
> static void mm_init_pasid(struct mm_struct *mm)
> {
> -#ifdef CONFIG_IOMMU_SUPPORT
> +#ifdef CONFIG_IOMMU_SVA
> mm->pasid = INIT_PASID;
> #endif
> }
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Best regards,
baolu
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