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cputlb: Handle TLB_NOTDIRTY in probe_access 

We can use notdirty_write for the write and return a valid host
pointer for this case.

Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-21 19:28:48 -07:00
parent 707526ad86
commit 73bc0bd41b
1 changed files with 17 additions and 9 deletions
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26
accel/tcg/cputlb.c
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@ -1168,16 +1168,24 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
return NULL;
}
/* Handle watchpoints. */
if (tlb_addr & TLB_WATCHPOINT) {
cpu_check_watchpoint(env_cpu(env), addr, size,
env_tlb(env)->d[mmu_idx].iotlb[index].attrs,
wp_access, retaddr);
}
if (unlikely(tlb_addr & TLB_FLAGS_MASK)) {
CPUIOTLBEntry *iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
/* Reject I/O access, or other required slow-path. */
if (tlb_addr & (TLB_NOTDIRTY | TLB_MMIO | TLB_BSWAP | TLB_DISCARD_WRITE)) {
return NULL;
/* Reject I/O access, or other required slow-path. */
if (tlb_addr & (TLB_MMIO | TLB_BSWAP | TLB_DISCARD_WRITE)) {
return NULL;
}
/* Handle watchpoints. */
if (tlb_addr & TLB_WATCHPOINT) {
cpu_check_watchpoint(env_cpu(env), addr, size,
iotlbentry->attrs, wp_access, retaddr);
}
/* Handle clean RAM pages. */
if (tlb_addr & TLB_NOTDIRTY) {
notdirty_write(env_cpu(env), addr, size, iotlbentry, retaddr);
}
}
return (void *)((uintptr_t)addr + entry->addend);