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implement simple memory snapshot mechanismus

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Uses Copy on Write to make it posible to restore the memory state after a snapshot
was made. To restore all MemoryRegions created after the snapshot are removed.
This commit is contained in:
Takacs, Philipp
2022-12-22 15:14:07 +01:00
parent 065af19dc5
commit 80bd825420
25 changed files with 302 additions and 52 deletions
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16
qemu/accel/tcg/cputlb.c
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@@ -2155,6 +2155,22 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
}
}
if (uc->snapshot_level && mr->ram && mr->priority < uc->snapshot_level) {
mr = memory_cow(uc, mr, addr & TARGET_PAGE_MASK, TARGET_PAGE_SIZE);
if (!mr) {
uc->invalid_addr = paddr;
uc->invalid_error = UC_ERR_NOMEM;
cpu_exit(uc->cpu);
return;
}
/* refill tlb after CoW */
tlb_fill(env_cpu(env), paddr, size, MMU_DATA_STORE,
mmu_idx, retaddr);
index = tlb_index(env, mmu_idx, addr);
entry = tlb_entry(env, mmu_idx, addr);
tlb_addr = tlb_addr_write(entry);
}
/* Handle anything that isn't just a straight memory access. */
if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) {
CPUIOTLBEntry *iotlbentry;