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

[Binbin Wu]

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