linux-kernel - Re: [PATCH v3 4/5] mshv: Allocate vp state page for HVCALL_MAP_VP_STATE

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Message-ID: <aNJWoV0H-7U85GMX@anirudh-surface.localdomain>
Date: Tue, 23 Sep 2025 08:13:21 +0000
From: Anirudh Rayabharam <anirudh@...rudhrb.com>
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, paekkaladevi@...ux.microsoft.com,
	kys@...rosoft.com, haiyangz@...rosoft.com, wei.liu@...nel.org,
	decui@...rosoft.com, Jinank Jain <jinankjain@...ux.microsoft.com>
Subject: Re: [PATCH v3 4/5] mshv: Allocate vp state page for
 HVCALL_MAP_VP_STATE_PAGE on L1VH

On Tue, Sep 16, 2025 at 04:44:21PM -0700, Nuno Das Neves wrote:
> From: Jinank Jain <jinankjain@...ux.microsoft.com>
> 
> Introduce mshv_use_overlay_gpfn() to check if a page needs to be
> allocated and passed to the hypervisor to map VP state pages. This is
> only needed on L1VH, and only on some (newer) versions of the
> hypervisor, hence the need to check vmm_capabilities.
> 
> Introduce functions hv_map/unmap_vp_state_page() to handle the
> allocation and freeing.
> 
> Signed-off-by: Jinank Jain <jinankjain@...ux.microsoft.com>
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
> Reviewed-by: Praveen K Paladugu <prapal@...ux.microsoft.com>
> Reviewed-by: Easwar Hariharan <easwar.hariharan@...ux.microsoft.com>
> ---
>  drivers/hv/mshv_root.h         | 11 ++---
>  drivers/hv/mshv_root_hv_call.c | 61 ++++++++++++++++++++++++---
>  drivers/hv/mshv_root_main.c    | 76 +++++++++++++++++-----------------
>  3 files changed, 98 insertions(+), 50 deletions(-)

Reviewed-by: Anirudh Rayabharam <anirudh@...rudhrb.com>