target/i386/cpu.c | 2 +- target/i386/cpu.h | 9 ++++++++- target/i386/helper.c | 4 ++++ 3 files changed, 13 insertions(+), 2 deletions(-)
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
--
2.25.1
Queued, thanks. Paolo
Queued, thanks. Paolo
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
Ping... 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 >
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 >
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