[PATCH v3 0/2] arm/arm64: KVM: Optimize arm64 fp/simd, saves 30-50% on exits
Mario Smarduch
m.smarduch at samsung.com
Wed Jun 24 17:04:10 PDT 2015
Currently we save/restore fp/simd on each exit. Fist patch optimizes arm64
save/restore, we only do so on Guest access. hackbench and
several lmbench tests show anywhere from 30% to above 50% optimzation
achieved.
In second patch 32-bit handler is updated to keep exit handling consistent
with 64-bit code.
Changes since v1:
- Addressed Marcs comments
- Verified optimization improvements with lmbench and hackbench, updated
commit message
Changes since v2:
- only for patch 2/2
- Reworked trapping to vfp access handler
Changes since v3:
- Only for patch 2/2
- Removed load_vcpu in switch_to_guest_vfp per Marcs comment
- Got another chance to replace an unreferenced label with a comment
Mario Smarduch (2):
Optimize arm64 skip 30-50% vfp/simd save/restore on exits
keep arm vfp/simd exit handling consistent with arm64
arch/arm/kvm/interrupts.S | 14 +++++++-----
arch/arm64/include/asm/kvm_arm.h | 5 ++++-
arch/arm64/kvm/hyp.S | 46 +++++++++++++++++++++++++++++++++++---
3 files changed, 55 insertions(+), 10 deletions(-)
--
1.7.9.5
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