linux-kernel - RE: [Patch v2 1/4] Drivers: hv: Allocate interrupt and monitor pages aligned to system page boundary

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Message-ID:
 <SA6PR21MB423107B78D442AA07B586169CE892@SA6PR21MB4231.namprd21.prod.outlook.com>
Date: Tue, 6 May 2025 00:58:31 +0000
From: Long Li <longli@...rosoft.com>
To: Michael Kelley <mhklinux@...look.com>, "longli@...uxonhyperv.com"
	<longli@...uxonhyperv.com>, KY Srinivasan <kys@...rosoft.com>, Haiyang Zhang
	<haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, Dexuan Cui
	<decui@...rosoft.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC: "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [Patch v2 1/4] Drivers: hv: Allocate interrupt and monitor pages
 aligned to system page boundary



> -----Original Message-----
> From: Michael Kelley <mhklinux@...look.com>
> Sent: Wednesday, April 30, 2025 6:56 PM
> To: longli@...uxonhyperv.com; KY Srinivasan <kys@...rosoft.com>; Haiyang
> Zhang <haiyangz@...rosoft.com>; Wei Liu <wei.liu@...nel.org>; Dexuan Cui
> <decui@...rosoft.com>; Greg Kroah-Hartman
> <gregkh@...uxfoundation.org>; linux-hyperv@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Cc: Long Li <longli@...rosoft.com>; stable@...r.kernel.org
> Subject: [EXTERNAL] RE: [Patch v2 1/4] Drivers: hv: Allocate interrupt and
> monitor pages aligned to system page boundary
> 
> From: longli@...uxonhyperv.com <longli@...uxonhyperv.com> Sent:
> Wednesday, April 30, 2025 3:06 PM
> >
> > There are use cases that interrupt and monitor pages are mapped to
> > user-mode through UIO, they need to be system page aligned. Some
> > Hyper-V
> 
> s/UIO, they/UIO, so they/
> 
> > allocation APIs introduced earlier broke those requirements.
> >
> > Fix those APIs by always allocating Hyper-V page at system page boundaries.
> 
> This patch modifies hv_alloc_hyperv_page() and friends. Then Patch 4 of the
> series deletes them, including the modifications. It would be less code motion
> to do the first part of Patch 4 (i.e., the use of __get_free_page directly in
> connection.c) here in Patch 1, and leave hv_alloc_hyperv_page() and friends
> unmodified. Continue to make the change to hv_kmsg_dump_register() here
> in Patch 1 as well.
> 
> Then have Patch 2 simply delete hv_alloc_hyperv_page() and friends because
> they are no longer used. The modifications to hv_alloc_hyperv_page() and
> friends would not be needed.
> 
> Patch 3 and 4 would be the additional changes in uio_hv_generic.c.
> 
> Michael

I have sent v3 of the patch series.

Long