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When exception payloads are enabled by userspace (which is not yet possible) and a #DB is raised in L2, defer the setting of DR6 until later. Under VMX, this allows the L1 hypervisor to intercept the fault before DR6 is modified. Under SVM, DR6 is modified before L1 can intercept the fault (as has always been the case with DR7). Note that the payload associated with a #DB exception includes only the "new DR6 bits." When the payload is delievered, DR6.B0-B3 will be cleared and DR6.RTM will be set prior to merging in the new DR6 bits. Also note that bit 16 in the "new DR6 bits" is set to indicate that a debug exception (#DB) or a breakpoint exception (#BP) occurred inside an RTM region while advanced debugging of RTM transactional regions was enabled. Though the reverse of DR6.RTM, this makes the #DB payload field compatible with both the pending debug exceptions field under VMX and the exit qualification for #DB exceptions under VMX. Reported-by: Jim Mattson <jmattson@google.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.