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| author | Alexander Graf <agraf@suse.de> | 2012-04-25 14:28:23 +0200 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2012-05-06 16:19:09 +0200 |
| commit | 8c2d0be7efb0b92b5e4f89ea4363f3cdc11e2459 (patch) | |
| tree | ebc66d35253d071517038a0c8608205011354896 /arch/powerpc/kvm/book3s_segment.S | |
| parent | 30124906db8598255fba32c8bf0adb7e8f1503ab (diff) | |
| download | lwn-8c2d0be7efb0b92b5e4f89ea4363f3cdc11e2459.tar.gz lwn-8c2d0be7efb0b92b5e4f89ea4363f3cdc11e2459.zip | |
KVM: PPC: Book3S: PR: Optimize entry path
By shuffling a few instructions around we can execute more memory
loads in parallel, giving us a small performance boost.
With this patch and a simple priviledged SPR access loop guest, I get
a speed bump from 2013052 to 2035607 exits per second.
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_segment.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_segment.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S index 0676ae249b9f..6bae0a9414ba 100644 --- a/arch/powerpc/kvm/book3s_segment.S +++ b/arch/powerpc/kvm/book3s_segment.S @@ -128,24 +128,25 @@ no_dcbz32_on: /* First clear RI in our current MSR value */ li r0, MSR_RI andc r6, r6, r0 - MTMSR_EERI(r6) - mtsrr0 r9 - mtsrr1 r4 PPC_LL r0, SVCPU_R0(r3) PPC_LL r1, SVCPU_R1(r3) PPC_LL r2, SVCPU_R2(r3) - PPC_LL r4, SVCPU_R4(r3) PPC_LL r5, SVCPU_R5(r3) - PPC_LL r6, SVCPU_R6(r3) PPC_LL r7, SVCPU_R7(r3) PPC_LL r8, SVCPU_R8(r3) - PPC_LL r9, SVCPU_R9(r3) PPC_LL r10, SVCPU_R10(r3) PPC_LL r11, SVCPU_R11(r3) PPC_LL r12, SVCPU_R12(r3) PPC_LL r13, SVCPU_R13(r3) + MTMSR_EERI(r6) + mtsrr0 r9 + mtsrr1 r4 + + PPC_LL r4, SVCPU_R4(r3) + PPC_LL r6, SVCPU_R6(r3) + PPC_LL r9, SVCPU_R9(r3) PPC_LL r3, (SVCPU_R3)(r3) RFI |