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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.

Backports commit 7f9af1abdcc69fd1d3d8d2be68464329600616d6 from qemu
This commit is contained in:
Nikunj A Dadhania 2018-03-02 15:15:01 -05:00 committed by Lioncash
parent 00ebbae128
commit d907423bac
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 7 additions and 1 deletions
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8
qemu/cputlb.c
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@ -581,7 +581,13 @@ 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. */