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cputlb: handle first atomic write to the page

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In case where the conditional write is the first write to the page,
TLB_NOTDIRTY will be set and stop_the_world is triggered. Handle this as
a special case and set the dirty bit. After that fall through to the
actual atomic instruction below.

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nikunj A Dadhania 2017-04-27 10:48:20 +05:30 committed by David Gibson
parent 253ce7b2cf
commit 7f9af1abdc
1 changed files with 7 additions and 1 deletions
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8
cputlb.c
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@ -930,7 +930,13 @@ static void *atomic_mmu_lookup(CPUArchState *env, target_ulong addr,
tlb_addr = tlbe->addr_write;
}
/* Notice an IO access, or a notdirty page. */
/* Check notdirty */
if (unlikely(tlb_addr & TLB_NOTDIRTY)) {
tlb_set_dirty(ENV_GET_CPU(env), addr);
tlb_addr = tlb_addr & ~TLB_NOTDIRTY;
}
/* Notice an IO access */
if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
/* There's really nothing that can be done to
support this apart from stop-the-world. */