These patches enable armv7 fp/simd lazy switch. On guest entry fp/simd access trap is set, and on guest first access fp/simd registers are switched - host saved, guest restored. CPU continues with guest fp/simd content until vcpu_put where guest is saved and host is restored. Running floating point workload illustrates reduction of fp/simd context switches the amount depends on the load. For a light load with with FP application running only 2% of all exits result in calls to lazy switch. arm64 version is in test and appears to work fine, remaining work is boot arm32 guest on arm64 and verify operation. Initial intent was to post all patches at once, but arm64 version will be posted soon. Mario Smarduch (2): add hooks for armv7 vfp/simd lazy switch support enable armv7 vfp/simd lazy switch arch/arm/include/asm/kvm_asm.h | 1 + arch/arm/include/asm/kvm_host.h | 3 +++ arch/arm/kernel/asm-offsets.c | 1 + arch/arm/kvm/arm.c | 17 +++++++++++++++++ arch/arm/kvm/interrupts.S | 40 +++++++++++++++++++++++++++++----------- 5 files changed, 51 insertions(+), 11 deletions(-) -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
