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According to section "Checks Related to Address-Space Size" in Intel SDM
vol 3C, the following checks are performed on vmentry of nested guests:
If the logical processor is outside IA-32e mode (if IA32_EFER.LMA = 0)
at the time of VM entry, the following must hold:
- The "IA-32e mode guest" VM-entry control is 0.
- The "host address-space size" VM-exit control is 0.
If the logical processor is in IA-32e mode (if IA32_EFER.LMA = 1) at the
time of VM entry, the "host address-space size" VM-exit control must be 1.
If the "host address-space size" VM-exit control is 0, the following must
hold:
- The "IA-32e mode guest" VM-entry control is 0.
- Bit 17 of the CR4 field (corresponding to CR4.PCIDE) is 0.
- Bits 63:32 in the RIP field are 0.
If the "host address-space size" VM-exit control is 1, the following must
hold:
- Bit 5 of the CR4 field (corresponding to CR4.PAE) is 1.
- The RIP field contains a canonical address.
On processors that do not support Intel 64 architecture, checks are
performed to ensure that the "IA-32e mode guest" VM-entry control and the
"host address-space size" VM-exit control are both 0.
Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Karl Heubaum <karl.heubaum@oracle.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.
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.