target/i386: add support for LAM

[PATCH v3 0/2] target/i386: add support for LAM

Binbin Wu posted 2 patches 9 months, 2 weeks ago

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git fetch https://github.com/patchew-project/qemu tags/patchew/20230721080800.2329-1-binbin.wu@linux.intel.com

Maintainers: Paolo Bonzini <pbonzini@redhat.com>

target/i386/cpu.c | 2 +-
target/i386/cpu.h | 9 ++++++++-
2 files changed, 9 insertions(+), 2 deletions(-)

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[PATCH v3 0/2] target/i386: add support for LAM

Posted by Binbin Wu 9 months, 2 weeks ago

Linear-address masking (LAM) [1], modifies the checking that is applied to
*64-bit* linear addresses, allowing software to use of the untranslated address
bits for metadata and masks the metadata bits before using them as linear 
addresses to access memory.

When the feature is virtualized and exposed to guest, it can be used for 
efficient
address sanitizers (ASAN) implementation and for optimizations in JITs and 
virtual
machines.

[1] Intel ISE https://cdrdv2.intel.com/v1/dl/getContent/671368
    Chapter Linear Address Masking (LAM)

---
Changelog
v3:
- Some change in commit message.
- Add handling of LAM control bits. (Xiaoyao)

v2:
- https://lists.gnu.org/archive/html/qemu-devel/2023-05/msg07842.html


Binbin Wu (1):
  target/i386: add control bits support for LAM

Robert Hoo (1):
  target/i386: add support for LAM in CPUID enumeration

 target/i386/cpu.c | 2 +-
 target/i386/cpu.h | 9 ++++++++-
 2 files changed, 9 insertions(+), 2 deletions(-)

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2.25.1