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Sean Christopherson 005ba37cb8 mm: thp: KVM: Explicitly check for THP when populating secondary MMU 
Add a helper, is_transparent_hugepage(), to explicitly check whether a
compound page is a THP and use it when populating KVM's secondary MMU.
The explicit check fixes a bug where a remapped compound page, e.g. for
an XDP Rx socket, is mapped into a KVM guest and is mistaken for a THP,
which results in KVM incorrectly creating a huge page in its secondary
MMU.

Fixes: 936a5fe6e6 ("thp: kvm mmu transparent hugepage support")
Reported-by: syzbot+c9d1fb51ac9d0d10c39d@syzkaller.appspotmail.com
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-01-27 20:00:01 +01:00
arch mm: thp: KVM: Explicitly check for THP when populating secondary MMU 2020-01-27 20:00:01 +01:00
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include mm: thp: KVM: Explicitly check for THP when populating secondary MMU 2020-01-27 20:00:01 +01:00
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mm mm: thp: KVM: Explicitly check for THP when populating secondary MMU 2020-01-27 20:00:01 +01:00
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tools tools/kvm_stat: Fix kvm_exit filter name 2020-01-23 09:51:06 +01:00
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virt mm: thp: KVM: Explicitly check for THP when populating secondary MMU 2020-01-27 20:00:01 +01:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.