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

[Binbin Wu <binbin.wu@linux.intel.com>]

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@linux.intel.com
>
> ---
> 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