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accel/tcg: Suppress auto-invalidate in probe_access_internal 

When PAGE_WRITE_INV is set when calling tlb_set_page,
we immediately set TLB_INVALID_MASK in order to force
tlb_fill to be called on the next lookup.  Here in
probe_access_internal, we have just called tlb_fill
and eliminated true misses, thus the lookup must be valid.

This allows us to remove a warning comment from s390x.
There doesn't seem to be a reason to change the code though.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2022-08-19 15:28:05 -07:00
parent 37523ff734
commit c3c8bf579b
2 changed files with 9 additions and 5 deletions
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10
accel/tcg/cputlb.c
View File

@ -1533,6 +1533,7 @@ static int probe_access_internal(CPUArchState *env, target_ulong addr,
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
flags = TLB_FLAGS_MASK;
page_addr = addr & TARGET_PAGE_MASK;
if (!tlb_hit_page(tlb_addr, page_addr)) {
if (!victim_tlb_hit(env, mmu_idx, index, elt_ofs, page_addr)) {
@ -1547,10 +1548,17 @@ static int probe_access_internal(CPUArchState *env, target_ulong addr,
/* TLB resize via tlb_fill may have moved the entry. */
entry = tlb_entry(env, mmu_idx, addr);
/*
* With PAGE_WRITE_INV, we set TLB_INVALID_MASK immediately,
* to force the next access through tlb_fill. We've just
* called tlb_fill, so we know that this entry *is* valid.
*/
flags &= ~TLB_INVALID_MASK;
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
}
flags = tlb_addr & TLB_FLAGS_MASK;
flags &= tlb_addr;
/* Fold all "mmio-like" bits into TLB_MMIO. This is not RAM. */
if (unlikely(flags & ~(TLB_WATCHPOINT | TLB_NOTDIRTY))) {

4
target/s390x/tcg/mem_helper.c
View File

@ -148,10 +148,6 @@ static int s390_probe_access(CPUArchState *env, target_ulong addr, int size,
#else
int flags;
/*
* For !CONFIG_USER_ONLY, we cannot rely on TLB_INVALID_MASK or haddr==NULL
* to detect if there was an exception during tlb_fill().
*/
env->tlb_fill_exc = 0;
flags = probe_access_flags(env, addr, access_type, mmu_idx, nonfault, phost,
ra);