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

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

Ping...

Hi Paolo,
do you have time to have a look at this patchset?


On 1/22/2024 4:55 PM, Binbin Wu wrote:
> 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
>