linux-kernel - [PATCH 0/6] hv: Remove dependencies on guest page size

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Date:   Fri, 5 Apr 2019 01:11:36 +0000
From:   Maya Nakamura <m.maya.nakamura@...il.com>
To:     mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        sthemmin@...rosoft.com, sashal@...nel.org
Cc:     x86@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/6] hv: Remove dependencies on guest page size

The Linux guest page size and hypervisor page size concepts are
different, even though they happen to be the same value on x86. Hyper-V
code mixes up the two, so this patchset begins to address that by
creating and using a set of Hyper-V specific page definitions.

A major benefit of those new definitions is that they support non-x86
architectures, such as ARM64, that use different page sizes. On ARM64,
the guest page size may not be 4096, and Hyper-V always runs with a page
size of 4096.

In this patchset, the first two patches lay the foundation for the
others, creating definitions and preparing for memory allocations of
Hyper-V pages. Subsequent patches apply the definitions where the guest
VM and Hyper-V communicate, and where the code intends to use the
Hyper-V page size. The last two patches set the ring buffer size to a
fixed value, removing the dependencies on the guest page size.

This is the initial set of changes to the Hyper-V code, and future
patches will make additional changes using the same foundation, for
example, replace __vmalloc() and related functions when Hyper-V pages
are intended.

Maya Nakamura (6):
  x86: hv: hyperv-tlfs.h: Create and use Hyper-V page definitions
  x86: hv: hv_init.c: Replace alloc_page() with kmem_cache_alloc()
  hv: vmbus: Replace page definition with Hyper-V specific one
  x86: hv: mmu.c: Replace page definitions with Hyper-V specific ones
  HID: hv: Remove dependencies on PAGE_SIZE for ring buffer
  Input: hv: Remove dependencies on PAGE_SIZE for ring buffer

 arch/x86/hyperv/hv_init.c             | 38 +++++++++++++++++++--------
 arch/x86/hyperv/mmu.c                 | 15 ++++++-----
 arch/x86/include/asm/hyperv-tlfs.h    | 12 ++++++++-
 drivers/hid/hid-hyperv.c              |  4 +--
 drivers/hv/hyperv_vmbus.h             |  8 +++---
 drivers/input/serio/hyperv-keyboard.c |  4 +--
 6 files changed, 54 insertions(+), 27 deletions(-)

-- 
2.17.1