linux-kernel - Re: [PATCH v4 0/7] hyperv: Introduce new way to manage hypercall args

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Message-ID: <43f8be57-a330-455f-8f9e-f5718ff1aa1a@linux.microsoft.com>
Date: Fri, 18 Jul 2025 13:25:27 -0700
From: Easwar Hariharan <eahariha@...ux.microsoft.com>
To: Michael Kelley <mhklinux@...look.com>,
 Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
 Naman Jain <namjain@...ux.microsoft.com>,
 Roman Kisel <romank@...ux.microsoft.com>
Cc: eahariha@...ux.microsoft.com, "kys@...rosoft.com" <kys@...rosoft.com>,
 "haiyangz@...rosoft.com" <haiyangz@...rosoft.com>,
 "wei.liu@...nel.org" <wei.liu@...nel.org>,
 "decui@...rosoft.com" <decui@...rosoft.com>,
 "tglx@...utronix.de" <tglx@...utronix.de>,
 "mingo@...hat.com" <mingo@...hat.com>, "bp@...en8.de" <bp@...en8.de>,
 "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
 "hpa@...or.com" <hpa@...or.com>,
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 <kw@...ux.com>, "mani@...nel.org" <mani@...nel.org>,
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 <arnd@...db.de>, "x86@...nel.org" <x86@...nel.org>,
 "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
 "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v4 0/7] hyperv: Introduce new way to manage hypercall args

On 7/18/2025 10:13 AM, Michael Kelley wrote:
> From: Easwar Hariharan <eahariha@...ux.microsoft.com> Sent: Friday, July 18, 2025 9:33 AM
>>
>> On 7/17/2025 9:55 PM, mhkelley58@...il.com wrote:
>>> From: Michael Kelley <mhklinux@...look.com>
>>>
> 
> [snip]
> 
>>>
>>> The new code compiles and runs successfully on x86 and arm64. However,
>>> basic smoke tests cover only a limited number of hypercall call sites
>>> that have been modified. I don't have the hardware or Hyper-V
>>> configurations needed to test running in the Hyper-V root partition
>>> or running in a VTL other than VTL 0. The related hypercall call sites
>>> still need to be tested to make sure I didn't break anything. Hopefully
>>> someone with the necessary configurations and Hyper-V versions can
>>> help with that testing.
> 
> Easwar -- 
> 
> Thanks for reviewing.
> 
> Any chance you (or someone else) could do a quick smoke test of this
> patch set when running in the Hyper-V root partition, and separately,
> when running in VTL2?  Some hypercall call sites are modified that
> don't get called in normal VTL0 execution. It just needs a quick
> verification that nothing is obviously broken for the root partition and
> VTL2 cases.
> 
> Michael
> 

I'm working almost entirely in VTL0, so I'd call on Nuno, Naman, and Roman (cc'ed) to help.

- Easwar