linux-kernel - [RFC PATCH 0/5] KVM: arm64: Add support for contiguous PTE/PMD hugepages at stage2

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Date:   Wed, 1 May 2019 09:44:22 +0000
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>,
        <kvm@...r.kernel.org>
CC:     <marc.zyngier@....com>, <christoffer.dall@....com>,
        <linux@...linux.org.uk>, <catalin.marinas@....com>,
        <will.deacon@....com>, <james.morse@....com>,
        <julien.thierry@....com>, <suzuki.poulose@....com>,
        <steve.capper@....com>, <wanghaibin.wang@...wei.com>,
        Zenghui Yu <yuzenghui@...wei.com>
Subject: [RFC PATCH 0/5] KVM: arm64: Add support for contiguous PTE/PMD hugepages at stage2

Currently, we support the following page sizes at stage2:

                PTE     PMD     PUD
               -----   -----   -----
 4K granule:     4K      2M      1G
16K granule:    16K     32M
64K granule:    64K    512M

And we have Contiguous bit[52] in stage2 VMSAv8-64 block and page
descriptors. As ARM ARM said, when the value of the Contiguous bit
is 1, it indicates that the entry is one of a number of adjacent
translation table entries that point to a contiguous output address
range.

This series add support for contiguous PTE/PMD hugepages at stage2
and then we can create huge mappings with following additional
sizes:

                CONT PTE     CONT PMD
                --------     --------
 4K granule:      64K          32M
16K granule:       2M           1G
64K granule:       2M          16G

These patches are based on v5.1.0-rc7 and have been tested on
Taishan 2280 server (D05) with 4K and 64K granule.

Any comments will be appreciated, thanks!

Zenghui Yu (5):
  KVM: arm/arm64: Introduce helpers for page table enties with
    contiguous bit
  KVM: arm/arm64: Re-factor building the stage2 page table entries
  KVM: arm/arm64: Support dirty page tracking for contiguous hugepages
  KVM: arm/arm64: Add support for creating PTE contiguous hugepages at
    stage2
  KVM: arm/arm64: Add support for creating PMD contiguous hugepages at
    stage2

 arch/arm/include/asm/kvm_mmu.h       |  22 +++
 arch/arm/include/asm/pgtable-hwdef.h |   8 +
 arch/arm64/include/asm/kvm_mmu.h     |  20 +++
 virt/kvm/arm/mmu.c                   | 299 ++++++++++++++++++++++++++++++-----
 4 files changed, 312 insertions(+), 37 deletions(-)

-- 
1.8.3.1