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cputlb: drop flush_global flag from tlb_flush

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We have never has the concept of global TLB entries which would avoid
the flush so we never actually use this flag. Drop it and make clear
that tlb_flush is the sledge-hammer it has always been.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
[DG: ppc portions]
Acked-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alex Bennée 2016-11-14 14:17:28 +00:00
parent ba7d3d1858
commit d10eb08f5d
29 changed files with 85 additions and 96 deletions
Download patch file Download diff file Expand all files Collapse all files

21
cputlb.c
View file

@ -60,24 +60,15 @@
/* statistics */
int tlb_flush_count;
/* NOTE:
* If flush_global is true (the usual case), flush all tlb entries.
* If flush_global is false, flush (at least) all tlb entries not
* marked global.
*
* Since QEMU doesn't currently implement a global/not-global flag
* for tlb entries, at the moment tlb_flush() will also flush all
* tlb entries in the flush_global == false case. This is OK because
* CPU architectures generally permit an implementation to drop
* entries from the TLB at any time, so flushing more entries than
* required is only an efficiency issue, not a correctness issue.
/* This is OK because CPU architectures generally permit an
* implementation to drop entries from the TLB at any time, so
* flushing more entries than required is only an efficiency issue,
* not a correctness issue.
*/
void tlb_flush(CPUState *cpu, int flush_global)
void tlb_flush(CPUState *cpu)
{
CPUArchState *env = cpu->env_ptr;
tlb_debug("(%d)\n", flush_global);
memset(env->tlb_table, -1, sizeof(env->tlb_table));
memset(env->tlb_v_table, -1, sizeof(env->tlb_v_table));
memset(cpu->tb_jmp_cache, 0, sizeof(cpu->tb_jmp_cache));
@ -144,7 +135,7 @@ void tlb_flush_page(CPUState *cpu, target_ulong addr)
TARGET_FMT_lx "/" TARGET_FMT_lx ")\n",
env->tlb_flush_addr, env->tlb_flush_mask);
tlb_flush(cpu, 1);
tlb_flush(cpu);
return;
}