Re: [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a contiguous and aligned kernel virtual area

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Subject: Re: [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a contiguous and aligned kernel virtual area
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Tue, 27 Feb 2024 06:56:24 -0800
Cc: linux-kernel@xxxxxxxxxxxxxxx, Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>, Lai Jiangshan <jiangshan.ljs@xxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Paolo Bonzini <pbonzini@xxxxxxxxxx>, x86@xxxxxxxxxx, Kees Cook <keescook@xxxxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Uladzislau Rezki <urezki@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, linux-mm@xxxxxxxxx
In-reply-to: <20240226143630.33643-16-jiangshanlai@gmail.com>
References: <20240226143630.33643-1-jiangshanlai@gmail.com> <20240226143630.33643-16-jiangshanlai@gmail.com>

On Mon, Feb 26, 2024 at 10:35:32PM +0800, Lai Jiangshan wrote:
> From: Hou Wenlong <houwenlong.hwl@xxxxxxxxxxxx>
> 
> PVM needs to reserve a contiguous and aligned kernel virtual area for

Who is "PVM", and why does it need aligned virtual memory space?

> +extern struct vm_struct *get_vm_area_align(unsigned long size, unsigned long align,

No need for the extern here.

Follow-Ups:
- Re: [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a contiguous and aligned kernel virtual area
  - From: Lai Jiangshan

References:
- [RFC PATCH 00/73] KVM: x86/PVM: Introduce a new hypervisor
  - From: Lai Jiangshan
- [RFC PATCH 15/73] mm/vmalloc: Add a helper to reserve a contiguous and aligned kernel virtual area
  - From: Lai Jiangshan

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