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cputlb: Move NOTDIRTY handling from I/O path to TLB path

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Pages that we want to track for NOTDIRTY are RAM.  We do not
really need to go through the I/O path to handle them.

Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-09-18 09:15:44 -07:00
parent 7b0d792ce1
commit 08565552f7
4 changed files with 23 additions and 71 deletions
Download patch file Download diff file Expand all files Collapse all files

26
accel/tcg/cputlb.c
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@ -905,7 +905,7 @@ static uint64_t io_readx(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
cpu->mem_io_pc = retaddr;
if (mr != &io_mem_notdirty && !cpu->can_do_io) {
if (!cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
@ -946,7 +946,7 @@ static void io_writex(CPUArchState *env, CPUIOTLBEntry *iotlbentry,
section = iotlb_to_section(cpu, iotlbentry->addr, iotlbentry->attrs);
mr = section->mr;
mr_offset = (iotlbentry->addr & TARGET_PAGE_MASK) + addr;
if (mr != &io_mem_notdirty && !cpu->can_do_io) {
if (!cpu->can_do_io) {
cpu_io_recompile(cpu, retaddr);
}
cpu->mem_io_vaddr = addr;
@ -1612,7 +1612,7 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
need_swap = size > 1 && (tlb_addr & TLB_BSWAP);
/* Handle I/O access. */
if (likely(tlb_addr & (TLB_MMIO | TLB_NOTDIRTY))) {
if (tlb_addr & TLB_MMIO) {
io_writex(env, iotlbentry, mmu_idx, val, addr, retaddr,
op ^ (need_swap * MO_BSWAP));
return;
@ -1625,6 +1625,26 @@ store_helper(CPUArchState *env, target_ulong addr, uint64_t val,
haddr = (void *)((uintptr_t)addr + entry->addend);
/* Handle clean RAM pages. */
if (tlb_addr & TLB_NOTDIRTY) {
NotDirtyInfo ndi;
/* We require mem_io_pc in tb_invalidate_phys_page_range. */
env_cpu(env)->mem_io_pc = retaddr;
memory_notdirty_write_prepare(&ndi, env_cpu(env), addr,
addr + iotlbentry->addr, size);
if (unlikely(need_swap)) {
store_memop(haddr, val, op ^ MO_BSWAP);
} else {
store_memop(haddr, val, op);
}
memory_notdirty_write_complete(&ndi);
return;
}
/*
* Keep these two store_memop separate to ensure that the compiler
* is able to fold the entire function to a single instruction.