QEMU_BUILD_BUG_ON(NB_MMU_MODES > 16);
#define ALL_MMUIDX_BITS ((1 << NB_MMU_MODES) - 1)
+/* flush_all_helper: run fn across all cpus
+ *
+ * If the wait flag is set then the src cpu's helper will be queued as
+ * "safe" work and the loop exited creating a synchronisation point
+ * where all queued work will be finished before execution starts
+ * again.
+ */
+static void flush_all_helper(CPUState *src, run_on_cpu_func fn,
+ run_on_cpu_data d)
+{
+ CPUState *cpu;
+
+ CPU_FOREACH(cpu) {
+ if (cpu != src) {
+ async_run_on_cpu(cpu, fn, d);
+ }
+ }
+}
+
/* statistics */
int tlb_flush_count;
}
}
+void tlb_flush_all_cpus(CPUState *src_cpu)
+{
+ const run_on_cpu_func fn = tlb_flush_global_async_work;
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_NULL);
+ fn(src_cpu, RUN_ON_CPU_NULL);
+}
+
+void tlb_flush_all_cpus_synced(CPUState *src_cpu)
+{
+ const run_on_cpu_func fn = tlb_flush_global_async_work;
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_NULL);
+ async_safe_run_on_cpu(src_cpu, fn, RUN_ON_CPU_NULL);
+}
+
static void tlb_flush_by_mmuidx_async_work(CPUState *cpu, run_on_cpu_data data)
{
CPUArchState *env = cpu->env_ptr;
}
}
+void tlb_flush_by_mmuidx_all_cpus(CPUState *src_cpu, uint16_t idxmap)
+{
+ const run_on_cpu_func fn = tlb_flush_by_mmuidx_async_work;
+
+ tlb_debug("mmu_idx: 0x%"PRIx16"\n", idxmap);
+
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
+ fn(src_cpu, RUN_ON_CPU_HOST_INT(idxmap));
+}
+
+void tlb_flush_by_mmuidx_all_cpus_synced(CPUState *src_cpu,
+ uint16_t idxmap)
+{
+ const run_on_cpu_func fn = tlb_flush_by_mmuidx_async_work;
+
+ tlb_debug("mmu_idx: 0x%"PRIx16"\n", idxmap);
+
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
+ async_safe_run_on_cpu(src_cpu, fn, RUN_ON_CPU_HOST_INT(idxmap));
+}
+
+
+
static inline void tlb_flush_entry(CPUTLBEntry *tlb_entry, target_ulong addr)
{
if (addr == (tlb_entry->addr_read &
}
}
-void tlb_flush_page_all(target_ulong addr)
+void tlb_flush_page_by_mmuidx_all_cpus(CPUState *src_cpu, target_ulong addr,
+ uint16_t idxmap)
{
- CPUState *cpu;
+ const run_on_cpu_func fn = tlb_check_page_and_flush_by_mmuidx_async_work;
+ target_ulong addr_and_mmu_idx;
- CPU_FOREACH(cpu) {
- async_run_on_cpu(cpu, tlb_flush_page_async_work,
- RUN_ON_CPU_TARGET_PTR(addr));
- }
+ tlb_debug("addr: "TARGET_FMT_lx" mmu_idx:%"PRIx16"\n", addr, idxmap);
+
+ /* This should already be page aligned */
+ addr_and_mmu_idx = addr & TARGET_PAGE_MASK;
+ addr_and_mmu_idx |= idxmap;
+
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_TARGET_PTR(addr_and_mmu_idx));
+ fn(src_cpu, RUN_ON_CPU_TARGET_PTR(addr_and_mmu_idx));
+}
+
+void tlb_flush_page_by_mmuidx_all_cpus_synced(CPUState *src_cpu,
+ target_ulong addr,
+ uint16_t idxmap)
+{
+ const run_on_cpu_func fn = tlb_check_page_and_flush_by_mmuidx_async_work;
+ target_ulong addr_and_mmu_idx;
+
+ tlb_debug("addr: "TARGET_FMT_lx" mmu_idx:%"PRIx16"\n", addr, idxmap);
+
+ /* This should already be page aligned */
+ addr_and_mmu_idx = addr & TARGET_PAGE_MASK;
+ addr_and_mmu_idx |= idxmap;
+
+ flush_all_helper(src_cpu, fn, RUN_ON_CPU_TARGET_PTR(addr_and_mmu_idx));
+ async_safe_run_on_cpu(src_cpu, fn, RUN_ON_CPU_TARGET_PTR(addr_and_mmu_idx));
+}
+
+void tlb_flush_page_all_cpus(CPUState *src, target_ulong addr)
+{
+ const run_on_cpu_func fn = tlb_flush_page_async_work;
+
+ flush_all_helper(src, fn, RUN_ON_CPU_TARGET_PTR(addr));
+ fn(src, RUN_ON_CPU_TARGET_PTR(addr));
+}
+
+void tlb_flush_page_all_cpus_synced(CPUState *src,
+ target_ulong addr)
+{
+ const run_on_cpu_func fn = tlb_flush_page_async_work;
+
+ flush_all_helper(src, fn, RUN_ON_CPU_TARGET_PTR(addr));
+ async_safe_run_on_cpu(src, fn, RUN_ON_CPU_TARGET_PTR(addr));
}
/* update the TLBs so that writes to code in the virtual page 'addr'
cpu_physical_memory_set_dirty_flag(ram_addr, DIRTY_MEMORY_CODE);
}
-static bool tlb_is_dirty_ram(CPUTLBEntry *tlbe)
-{
- return (tlbe->addr_write & (TLB_INVALID_MASK|TLB_MMIO|TLB_NOTDIRTY)) == 0;
-}
-void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry, uintptr_t start,
+/*
+ * Dirty write flag handling
+ *
+ * When the TCG code writes to a location it looks up the address in
+ * the TLB and uses that data to compute the final address. If any of
+ * the lower bits of the address are set then the slow path is forced.
+ * There are a number of reasons to do this but for normal RAM the
+ * most usual is detecting writes to code regions which may invalidate
+ * generated code.
+ *
+ * Because we want other vCPUs to respond to changes straight away we
+ * update the te->addr_write field atomically. If the TLB entry has
+ * been changed by the vCPU in the mean time we skip the update.
+ *
+ * As this function uses atomic accesses we also need to ensure
+ * updates to tlb_entries follow the same access rules. We don't need
+ * to worry about this for oversized guests as MTTCG is disabled for
+ * them.
+ */
+
+static void tlb_reset_dirty_range(CPUTLBEntry *tlb_entry, uintptr_t start,
uintptr_t length)
{
- uintptr_t addr;
+#if TCG_OVERSIZED_GUEST
+ uintptr_t addr = tlb_entry->addr_write;
- if (tlb_is_dirty_ram(tlb_entry)) {
- addr = (tlb_entry->addr_write & TARGET_PAGE_MASK) + tlb_entry->addend;
+ if ((addr & (TLB_INVALID_MASK | TLB_MMIO | TLB_NOTDIRTY)) == 0) {
+ addr &= TARGET_PAGE_MASK;
+ addr += tlb_entry->addend;
if ((addr - start) < length) {
tlb_entry->addr_write |= TLB_NOTDIRTY;
}
}
+#else
+ /* paired with atomic_mb_set in tlb_set_page_with_attrs */
+ uintptr_t orig_addr = atomic_mb_read(&tlb_entry->addr_write);
+ uintptr_t addr = orig_addr;
+
+ if ((addr & (TLB_INVALID_MASK | TLB_MMIO | TLB_NOTDIRTY)) == 0) {
+ addr &= TARGET_PAGE_MASK;
+ addr += atomic_read(&tlb_entry->addend);
+ if ((addr - start) < length) {
+ uintptr_t notdirty_addr = orig_addr | TLB_NOTDIRTY;
+ atomic_cmpxchg(&tlb_entry->addr_write, orig_addr, notdirty_addr);
+ }
+ }
+#endif
}
+/* For atomic correctness when running MTTCG we need to use the right
+ * primitives when copying entries */
+static inline void copy_tlb_helper(CPUTLBEntry *d, CPUTLBEntry *s,
+ bool atomic_set)
+{
+#if TCG_OVERSIZED_GUEST
+ *d = *s;
+#else
+ if (atomic_set) {
+ d->addr_read = s->addr_read;
+ d->addr_code = s->addr_code;
+ atomic_set(&d->addend, atomic_read(&s->addend));
+ /* Pairs with flag setting in tlb_reset_dirty_range */
+ atomic_mb_set(&d->addr_write, atomic_read(&s->addr_write));
+ } else {
+ d->addr_read = s->addr_read;
+ d->addr_write = atomic_read(&s->addr_write);
+ d->addr_code = s->addr_code;
+ d->addend = atomic_read(&s->addend);
+ }
+#endif
+}
+
+/* This is a cross vCPU call (i.e. another vCPU resetting the flags of
+ * the target vCPU). As such care needs to be taken that we don't
+ * dangerously race with another vCPU update. The only thing actually
+ * updated is the target TLB entry ->addr_write flags.
+ */
void tlb_reset_dirty(CPUState *cpu, ram_addr_t start1, ram_addr_t length)
{
CPUArchState *env;
int mmu_idx;
- assert_cpu_is_self(cpu);
-
env = cpu->env_ptr;
for (mmu_idx = 0; mmu_idx < NB_MMU_MODES; mmu_idx++) {
unsigned int i;
target_ulong address;
target_ulong code_address;
uintptr_t addend;
- CPUTLBEntry *te;
+ CPUTLBEntry *te, *tv, tn;
hwaddr iotlb, xlat, sz;
unsigned vidx = env->vtlb_index++ % CPU_VTLB_SIZE;
int asidx = cpu_asidx_from_attrs(cpu, attrs);
index = (vaddr >> TARGET_PAGE_BITS) & (CPU_TLB_SIZE - 1);
te = &env->tlb_table[mmu_idx][index];
-
/* do not discard the translation in te, evict it into a victim tlb */
- env->tlb_v_table[mmu_idx][vidx] = *te;
+ tv = &env->tlb_v_table[mmu_idx][vidx];
+
+ /* addr_write can race with tlb_reset_dirty_range */
+ copy_tlb_helper(tv, te, true);
+
env->iotlb_v[mmu_idx][vidx] = env->iotlb[mmu_idx][index];
/* refill the tlb */
env->iotlb[mmu_idx][index].addr = iotlb - vaddr;
env->iotlb[mmu_idx][index].attrs = attrs;
- te->addend = addend - vaddr;
+
+ /* Now calculate the new entry */
+ tn.addend = addend - vaddr;
if (prot & PAGE_READ) {
- te->addr_read = address;
+ tn.addr_read = address;
} else {
- te->addr_read = -1;
+ tn.addr_read = -1;
}
if (prot & PAGE_EXEC) {
- te->addr_code = code_address;
+ tn.addr_code = code_address;
} else {
- te->addr_code = -1;
+ tn.addr_code = -1;
}
+
+ tn.addr_write = -1;
if (prot & PAGE_WRITE) {
if ((memory_region_is_ram(section->mr) && section->readonly)
|| memory_region_is_romd(section->mr)) {
/* Write access calls the I/O callback. */
- te->addr_write = address | TLB_MMIO;
+ tn.addr_write = address | TLB_MMIO;
} else if (memory_region_is_ram(section->mr)
&& cpu_physical_memory_is_clean(
memory_region_get_ram_addr(section->mr) + xlat)) {
- te->addr_write = address | TLB_NOTDIRTY;
+ tn.addr_write = address | TLB_NOTDIRTY;
} else {
- te->addr_write = address;
+ tn.addr_write = address;
}
- } else {
- te->addr_write = -1;
}
+
+ /* Pairs with flag setting in tlb_reset_dirty_range */
+ copy_tlb_helper(te, &tn, true);
+ /* atomic_mb_set(&te->addr_write, write_address); */
}
/* Add a new TLB entry, but without specifying the memory
pd = iotlbentry->addr & ~TARGET_PAGE_MASK;
mr = iotlb_to_region(cpu, pd, iotlbentry->attrs);
if (memory_region_is_unassigned(mr)) {
- CPUClass *cc = CPU_GET_CLASS(cpu);
-
- if (cc->do_unassigned_access) {
- cc->do_unassigned_access(cpu, addr, false, true, 0, 4);
- } else {
- report_bad_exec(cpu, addr);
- exit(1);
- }
+ cpu_unassigned_access(cpu, addr, false, true, 0, 4);
+ /* The CPU's unassigned access hook might have longjumped out
+ * with an exception. If it didn't (or there was no hook) then
+ * we can't proceed further.
+ */
+ report_bad_exec(cpu, addr);
+ exit(1);
}
p = (void *)((uintptr_t)addr + env1->tlb_table[mmu_idx][page_index].addend);
return qemu_ram_addr_from_host_nofail(p);
if (cmp == page) {
/* Found entry in victim tlb, swap tlb and iotlb. */
CPUTLBEntry tmptlb, *tlb = &env->tlb_table[mmu_idx][index];
+
+ copy_tlb_helper(&tmptlb, tlb, false);
+ copy_tlb_helper(tlb, vtlb, true);
+ copy_tlb_helper(vtlb, &tmptlb, true);
+
CPUIOTLBEntry tmpio, *io = &env->iotlb[mmu_idx][index];
CPUIOTLBEntry *vio = &env->iotlb_v[mmu_idx][vidx];
-
- tmptlb = *tlb; *tlb = *vtlb; *vtlb = tmptlb;
tmpio = *io; *io = *vio; *vio = tmpio;
return true;
}
projects / mirror_qemu.git / blobdiff