linux-kernel - [PATCH 0/2] kvm: Fixes for race conditions

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Message-Id: <1493028624-29837-1-git-send-email-suzuki.poulose@arm.com>
Date:   Mon, 24 Apr 2017 11:10:22 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     pbonzini@...hat.com
Cc:     christoffer.dall@...aro.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        kvm@...r.kernel.org, marc.zyngier@....com, mark.rutland@....com,
        andreyknvl@...gle.com, rkrcmar@...hat.com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 0/2] kvm: Fixes for race conditions

The two patches here fixes race conditions in the KVM hypervisor code
dealing with the shadow MMU.

The first one applies to core KVM code where mmu_notifier->ops.release()
could be called twice with one instance possibily accessing a free'd KVM
instance. Reported here :

 http://lkml.kernel.org/r/CAAeHK+x8udHKq9xa1zkTO6ax5E8Dk32HYWfaT05FMchL2cr48g@mail.gmail.com

The second patch is specific to arm/arm64 stage2 PGD, where there are issues
with modifications to the PGD pointer outside the mmu_lock, leading to crashes.
Reported here :
 http://lkml.kernel.org/r/febea966-3767-21ff-3c40-1a76d1399138@suse.de

Suzuki K Poulose (2):
  kvm: Fix mmu_notifier release race
  kvm: arm/arm64: Fix race in resetting stage2 PGD

 arch/arm/kvm/mmu.c       | 14 +++++++-----
 include/linux/kvm_host.h |  1 +
 virt/kvm/kvm_main.c      | 59 ++++++++++++++++++++++++++++++++++++++++++------
 3 files changed, 61 insertions(+), 13 deletions(-)

-- 
2.7.4