b39bd520a6
Stub in vmx_get_untagged_addr() and wire up calls from the emulator (via
get_untagged_addr()) and "direct" calls from various VM-Exit handlers in
VMX where LAM untagging is supposed to be applied. Defer implementing
the guts of vmx_get_untagged_addr() to future patches purely to make the
changes easier to consume.
LAM is active only for 64-bit linear addresses and several types of
accesses are exempted.
- Cases need to untag address (handled in get_vmx_mem_address())
Operand(s) of VMX instructions and INVPCID.
Operand(s) of SGX ENCLS.
- Cases LAM doesn't apply to (no change needed)
Operand of INVLPG.
Linear address in INVPCID descriptor.
Linear address in INVVPID descriptor.
BASEADDR specified in SECS of ECREATE.
Note:
- LAM doesn't apply to write to control registers or MSRs
- LAM masking is applied before walking page tables, i.e. the faulting
linear address in CR2 doesn't contain the metadata.
- The guest linear address saved in VMCS doesn't contain metadata.
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Chao Gao <chao.gao@intel.com>
Tested-by: Xuelian Guo <xuelian.guo@intel.com>
Link: https://lore.kernel.org/r/20230913124227.12574-10-binbin.wu@linux.intel.com
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
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.