Re: [PATCH v4 0/2] Add support for LAM in QEMU

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Gentle ping...
Please help to review and consider applying the patch series. (The KVM
part has been merged).


On 1/12/2024 2:00 PM, Binbin Wu wrote:
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.

The KVM patch series can be found in [2].

[1] Intel ISE https://cdrdv2.intel.com/v1/dl/getContent/671368
     Chapter Linear Address Masking (LAM)
[2] https://lore.kernel.org/kvm/20230913124227.12574-1-binbin.wu@xxxxxxxxxxxxxxx

---
Changelog
v4:
- Add a reviewed-by from Xiaoyao for patch 1.
- Mask out LAM bit on CR4 if vcpu doesn't support LAM in cpu_x86_update_cr4() (Xiaoyao)

v3:
- https://lists.gnu.org/archive/html/qemu-devel/2023-07/msg04160.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 ++++++++-
  target/i386/helper.c | 4 ++++
  3 files changed, 13 insertions(+), 2 deletions(-)


base-commit: f614acb7450282a119d85d759f27eae190476058





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