mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

target/ppc: 4xx optimise tlbwe_lo TLB flushing

Browse Source 
Rather than tlbwe_lo always flushing all TCG TLBs, have it flush just
those corresponding to the old software TLB, and only if it was valid.

Tested-by: BALATON Zoltan <balaton@eik.bme.hu>
Acked-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2023-11-13 22:49:53 +10:00
parent 372dbdb90c
commit 2ab0348481
1 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
target/ppc/mmu_helper.c
View File

@ -813,12 +813,20 @@ void helper_4xx_tlbwe_hi(CPUPPCState *env, target_ulong entry,
void helper_4xx_tlbwe_lo(CPUPPCState *env, target_ulong entry,
target_ulong val)
{
CPUState *cs = env_cpu(env);
ppcemb_tlb_t *tlb;
qemu_log_mask(CPU_LOG_MMU, "%s entry %i val " TARGET_FMT_lx "\n",
__func__, (int)entry, val);
entry &= PPC4XX_TLB_ENTRY_MASK;
tlb = &env->tlb.tlbe[entry];
/* Invalidate previous TLB (if it's valid) */
if (tlb->prot & PAGE_VALID) {
qemu_log_mask(CPU_LOG_MMU, "%s: invalidate old TLB %d start "
TARGET_FMT_lx " end " TARGET_FMT_lx "\n", __func__,
(int)entry, tlb->EPN, tlb->EPN + tlb->size);
ppcemb_tlb_flush(cs, tlb);
}
tlb->attr = val & PPC4XX_TLBLO_ATTR_MASK;
tlb->RPN = val & PPC4XX_TLBLO_RPN_MASK;
tlb->prot = PAGE_READ;
@ -836,8 +844,6 @@ void helper_4xx_tlbwe_lo(CPUPPCState *env, target_ulong entry,
tlb->prot & PAGE_WRITE ? 'w' : '-',
tlb->prot & PAGE_EXEC ? 'x' : '-',
tlb->prot & PAGE_VALID ? 'v' : '-', (int)tlb->PID);
env->tlb_need_flush |= TLB_NEED_LOCAL_FLUSH;
}
target_ulong helper_4xx_tlbsx(CPUPPCState *env, target_ulong address)