linux-kernel - [Patch v3 0/5] Fix uio_hv_generic on systems with >4k page sizes

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Message-Id: <1746492997-4599-1-git-send-email-longli@linuxonhyperv.com>
Date: Mon,  5 May 2025 17:56:32 -0700
From: longli@...uxonhyperv.com
To: "K. Y. 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>
Subject: [Patch v3 0/5] Fix uio_hv_generic on systems with >4k page sizes

From: Long Li <longli@...rosoft.com>

UIO framework requires the device memory aligned to page boundary.
Hyper-V may allocate some memory that is Hyper-V page aligned (4k)
but not system page aligned.

Fix this by having Hyper-V always allocate those pages on system page
boundary and expose them to user-mode.

Change in v2:
Added two more patches to the series:
"uio_hv_generic: Adjust ring size according to system page alignment"
"Drivers: hv: Remove hv_free/alloc_* helpers"

Added more details in the commit message of
"uio_hv_generic: Use correct size for interrupt and monitor pages"

Change in v3:
Rearranged the patch on removing hv_alloc/free* helpers
Added "Drivers: hv: Use kzalloc for panic page allocation"
Fixed typos.

Long Li (5):
  Drivers: hv: Allocate interrupt and monitor pages aligned to system
    page boundary
  uio_hv_generic: Use correct size for interrupt and monitor pages
  uio_hv_generic: Align ring size to system page
  Drivers: hv: Use kzalloc for panic page allocation
  Drivers: hv: Remove hv_alloc/free_* helpers

 drivers/hv/connection.c        | 23 ++++++++++++-----
 drivers/hv/hv_common.c         | 45 +++-------------------------------
 drivers/uio/uio_hv_generic.c   |  7 ++++--
 include/asm-generic/mshyperv.h |  4 ---
 4 files changed, 25 insertions(+), 54 deletions(-)

-- 
2.34.1