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parisc: speed up flush_tlb_all_local with qemu 

When started in qemu, we know that qemu will drop all local TLB entries
on any pxtlbe instruction. So, if we detect qemu, replace the whole
flush_tlb_all_local function by one pdtlbe instruction.

Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2019-08-12 19:13:20 +02:00
parent 82992fc70f
commit a5ff2130a4
1 changed files with 9 additions and 0 deletions
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9
arch/parisc/kernel/pacache.S
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@ -174,6 +174,15 @@ fdtdone:
2: bv %r0(%r2)
nop
/*
* When running in qemu, drop whole flush_tlb_all_local function and
* replace by one pdtlbe instruction, for which QEMU will drop all
* local TLB entries.
*/
3: pdtlbe %r0(%sr1,%r0)
bv,n %r0(%r2)
ALTERNATIVE_CODE(flush_tlb_all_local, 2, ALT_COND_RUN_ON_QEMU, 3b)
ENDPROC_CFI(flush_tlb_all_local)
.import cache_info,data