linux-kernel - Re: [PATCH v5 0/5] mshv: Fixes for stats and vp state page mappings

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Message-ID: <20251013190014.GA3862989@liuwe-devbox-debian-v2.local>
Date: Mon, 13 Oct 2025 19:00:14 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
	prapal@...ux.microsoft.com, easwar.hariharan@...ux.microsoft.com,
	tiala@...rosoft.com, anirudh@...rudhrb.com,
	paekkaladevi@...ux.microsoft.com, skinsburskii@...ux.microsoft.com,
	mhklinux@...look.com, kys@...rosoft.com, haiyangz@...rosoft.com,
	wei.liu@...nel.org, decui@...rosoft.com
Subject: Re: [PATCH v5 0/5] mshv: Fixes for stats and vp state page mappings

On Fri, Oct 10, 2025 at 02:55:46PM -0700, Nuno Das Neves wrote:
> There are some differences in how L1VH partitions must map stats and vp
> state pages, some of which are due to differences across hypervisor
> versions. Detect and handle these cases.
> 
> Patch 1:
> Fix for the logic of when to map the vp stats page for the root scheduler.
> 
> Patch 2-3:
> Add HVCALL_GET_PARTITION_PROPERTY_EX and use it to query "vmm capabilities" on
> module init.
> 
> Patches 4-5:
> Check a feature bit in vmm capabilities, to take a new code path for mapping
> stats and vp state pages. In this case, the stats and vp state pages must be
> allocated by Linux, and a new hypercall HVCALL_MAP_VP_STATS_PAGE2 must be used
> to map the stats page.

Applied to hyperv-next. Thanks.