Re: [PATCH v4 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()

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To: "Michael Kelley (LINUX)" <mikelley@xxxxxxxxxxxxx>
Subject: Re: [PATCH v4 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()
From: "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>
Date: Wed, 12 Apr 2023 18:20:37 +0300
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>, "ak@xxxxxxxxxxxxxxx" <ak@xxxxxxxxxxxxxxx>, "arnd@xxxxxxxx" <arnd@xxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "brijesh.singh@xxxxxxx" <brijesh.singh@xxxxxxx>, "dan.j.williams@xxxxxxxxx" <dan.j.williams@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "jane.chu@xxxxxxxxxx" <jane.chu@xxxxxxxxxx>, KY Srinivasan <kys@xxxxxxxxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, "linux-hyperv@xxxxxxxxxxxxxxx" <linux-hyperv@xxxxxxxxxxxxxxx>, "luto@xxxxxxxxxx" <luto@xxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "rostedt@xxxxxxxxxxx" <rostedt@xxxxxxxxxxx>, "sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx" <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, "seanjc@xxxxxxxxxx" <seanjc@xxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "tony.luck@xxxxxxxxx" <tony.luck@xxxxxxxxx>, "wei.liu@xxxxxxxxxx" <wei.liu@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
In-reply-to: <BYAPR21MB16885F59B6F5594F31AE957AD79A9@BYAPR21MB1688.namprd21.prod.outlook.com>
References: <20230408204759.14902-1-decui@microsoft.com> <20230408204759.14902-3-decui@microsoft.com> <BYAPR21MB16885F59B6F5594F31AE957AD79A9@BYAPR21MB1688.namprd21.prod.outlook.com>

On Tue, Apr 11, 2023 at 04:28:20PM +0000, Michael Kelley (LINUX) wrote:
> Does anyone know if there is a reason to use one vs. the other?
> slow_virt_to_phys() is x86-only, but that's not a problem here.

slow_virt_to_phys() is more generic as it works for non-vmalloc addresses,
but generally they are equivalent for the use.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov

References:
- [PATCH v4 0/6] Support TDX guests on Hyper-V
  - From: Dexuan Cui
- [PATCH v4 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()
  - From: Dexuan Cui
- RE: [PATCH v4 2/6] x86/tdx: Support vmalloc() for tdx_enc_status_changed()
  - From: Michael Kelley (LINUX)

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