Hi, This series adds APX (Advanced Performance Extensions) support in QEMU to enable APX in Guest based on KVM.
This series is based on CET v4: https://lore.kernel.org/qemu-devel/[email protected]/ And you can also find the code here: https://gitlab.com/zhao.liu/qemu/-/commits/i386-all-for-dmr-v1.1-11-17-2025 The patches for KVM side can be found at: https://lore.kernel.org/kvm/[email protected]/ Thanks for your review! Overview ======== Intel Advanced Performance Extensions (Intel APX) expands the Intel 64 instruction set architecture with access to more registers (16 additional general-purpose registers (GPRs) R16–R31) and adds various new features that improve general-purpose performance. The extensions are designed to provide efficient performance gains across a variety of workloads without significantly increasing silicon area or power consumption of the core. APX spec link (rev.07) is: https://cdrdv2.intel.com/v1/dl/getContent/861610 At QEMU side, the enabling work mainly includes two parts: 1. save/restore/migrate the xstate of APX. * APX xstate is a user xstate, but it reuses MPX xstate area in un-compacted XSAVE buffer. * To address this, QEMU will reject both APX and MPX if their CPUID feature bits are set at the same (in Patch 1). 2. add related CPUIDs support in feature words. Thanks and Best Regards, Zhao --- Zhao Liu (2): i386/cpu: Support APX CPUIDs i386/cpu: Mark apx xstate as migratable Zide Chen (3): i386/cpu: Add APX EGPRs into xsave area i386/cpu: Cache EGPRs in CPUX86State i386/cpu: Add APX migration support target/i386/cpu.c | 68 ++++++++++++++++++++++++++++++++++++-- target/i386/cpu.h | 26 +++++++++++++-- target/i386/machine.c | 24 ++++++++++++++ target/i386/xsave_helper.c | 14 ++++++++ 4 files changed, 128 insertions(+), 4 deletions(-) -- 2.34.1
