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-rw-r--r--accel/tcg/cputlb.c157
-rw-r--r--accel/tcg/user-exec.c43
-rw-r--r--include/exec/cpu-all.h13
-rw-r--r--include/exec/exec-all.h22
4 files changed, 148 insertions, 87 deletions
diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index e3b5750c3b..c708e9785f 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1231,131 +1231,134 @@ static void notdirty_write(CPUState *cpu, vaddr mem_vaddr, unsigned size,
}
}
-/*
- * Probe for whether the specified guest access is permitted. If it is not
- * permitted then an exception will be taken in the same way as if this
- * were a real access (and we will not return).
- * If the size is 0 or the page requires I/O access, returns NULL; otherwise,
- * returns the address of the host page similar to tlb_vaddr_to_host().
- */
-void *probe_access(CPUArchState *env, target_ulong addr, int size,
- MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
+static int probe_access_internal(CPUArchState *env, target_ulong addr,
+ int fault_size, MMUAccessType access_type,
+ int mmu_idx, bool nonfault,
+ void **phost, uintptr_t retaddr)
{
uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
- target_ulong tlb_addr;
+ target_ulong tlb_addr, page_addr;
size_t elt_ofs;
- int wp_access;
-
- g_assert(-(addr | TARGET_PAGE_MASK) >= size);
+ int flags;
switch (access_type) {
case MMU_DATA_LOAD:
elt_ofs = offsetof(CPUTLBEntry, addr_read);
- wp_access = BP_MEM_READ;
break;
case MMU_DATA_STORE:
elt_ofs = offsetof(CPUTLBEntry, addr_write);
- wp_access = BP_MEM_WRITE;
break;
case MMU_INST_FETCH:
elt_ofs = offsetof(CPUTLBEntry, addr_code);
- wp_access = BP_MEM_READ;
break;
default:
g_assert_not_reached();
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
- if (unlikely(!tlb_hit(tlb_addr, addr))) {
- if (!victim_tlb_hit(env, mmu_idx, index, elt_ofs,
- addr & TARGET_PAGE_MASK)) {
- tlb_fill(env_cpu(env), addr, size, access_type, mmu_idx, retaddr);
- /* TLB resize via tlb_fill may have moved the entry. */
- index = tlb_index(env, mmu_idx, addr);
+ page_addr = addr & TARGET_PAGE_MASK;
+ if (!tlb_hit_page(tlb_addr, page_addr)) {
+ if (!victim_tlb_hit(env, mmu_idx, index, elt_ofs, page_addr)) {
+ CPUState *cs = env_cpu(env);
+ CPUClass *cc = CPU_GET_CLASS(cs);
+
+ if (!cc->tlb_fill(cs, addr, fault_size, access_type,
+ mmu_idx, nonfault, retaddr)) {
+ /* Non-faulting page table read failed. */
+ *phost = NULL;
+ return TLB_INVALID_MASK;
+ }
+
+ /* TLB resize via tlb_fill may have moved the entry. */
entry = tlb_entry(env, mmu_idx, addr);
}
tlb_addr = tlb_read_ofs(entry, elt_ofs);
}
+ flags = tlb_addr & TLB_FLAGS_MASK;
- if (!size) {
- return NULL;
+ /* Fold all "mmio-like" bits into TLB_MMIO. This is not RAM. */
+ if (unlikely(flags & ~(TLB_WATCHPOINT | TLB_NOTDIRTY))) {
+ *phost = NULL;
+ return TLB_MMIO;
}
- if (unlikely(tlb_addr & TLB_FLAGS_MASK)) {
+ /* Everything else is RAM. */
+ *phost = (void *)((uintptr_t)addr + entry->addend);
+ return flags;
+}
+
+int probe_access_flags(CPUArchState *env, target_ulong addr,
+ MMUAccessType access_type, int mmu_idx,
+ bool nonfault, void **phost, uintptr_t retaddr)
+{
+ int flags;
+
+ flags = probe_access_internal(env, addr, 0, access_type, mmu_idx,
+ nonfault, phost, retaddr);
+
+ /* Handle clean RAM pages. */
+ if (unlikely(flags & TLB_NOTDIRTY)) {
+ uintptr_t index = tlb_index(env, mmu_idx, addr);
CPUIOTLBEntry *iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
- /* Reject I/O access, or other required slow-path. */
- if (tlb_addr & (TLB_MMIO | TLB_BSWAP | TLB_DISCARD_WRITE)) {
- return NULL;
- }
+ notdirty_write(env_cpu(env), addr, 1, iotlbentry, retaddr);
+ flags &= ~TLB_NOTDIRTY;
+ }
+
+ return flags;
+}
+
+void *probe_access(CPUArchState *env, target_ulong addr, int size,
+ MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
+{
+ void *host;
+ int flags;
+
+ g_assert(-(addr | TARGET_PAGE_MASK) >= size);
+
+ flags = probe_access_internal(env, addr, size, access_type, mmu_idx,
+ false, &host, retaddr);
+
+ /* Per the interface, size == 0 merely faults the access. */
+ if (size == 0) {
+ return NULL;
+ }
+
+ if (unlikely(flags & (TLB_NOTDIRTY | TLB_WATCHPOINT))) {
+ uintptr_t index = tlb_index(env, mmu_idx, addr);
+ CPUIOTLBEntry *iotlbentry = &env_tlb(env)->d[mmu_idx].iotlb[index];
/* Handle watchpoints. */
- if (tlb_addr & TLB_WATCHPOINT) {
+ if (flags & TLB_WATCHPOINT) {
+ int wp_access = (access_type == MMU_DATA_STORE
+ ? BP_MEM_WRITE : BP_MEM_READ);
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);
+ if (flags & TLB_NOTDIRTY) {
+ notdirty_write(env_cpu(env), addr, 1, iotlbentry, retaddr);
}
}
- return (void *)((uintptr_t)addr + entry->addend);
+ return host;
}
void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr,
MMUAccessType access_type, int mmu_idx)
{
- CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
- target_ulong tlb_addr, page;
- size_t elt_ofs;
-
- switch (access_type) {
- case MMU_DATA_LOAD:
- elt_ofs = offsetof(CPUTLBEntry, addr_read);
- break;
- case MMU_DATA_STORE:
- elt_ofs = offsetof(CPUTLBEntry, addr_write);
- break;
- case MMU_INST_FETCH:
- elt_ofs = offsetof(CPUTLBEntry, addr_code);
- break;
- default:
- g_assert_not_reached();
- }
+ void *host;
+ int flags;
- page = addr & TARGET_PAGE_MASK;
- tlb_addr = tlb_read_ofs(entry, elt_ofs);
-
- if (!tlb_hit_page(tlb_addr, page)) {
- uintptr_t index = tlb_index(env, mmu_idx, addr);
-
- if (!victim_tlb_hit(env, mmu_idx, index, elt_ofs, page)) {
- CPUState *cs = env_cpu(env);
- CPUClass *cc = CPU_GET_CLASS(cs);
+ flags = probe_access_internal(env, addr, 0, access_type,
+ mmu_idx, true, &host, 0);
- if (!cc->tlb_fill(cs, addr, 0, access_type, mmu_idx, true, 0)) {
- /* Non-faulting page table read failed. */
- return NULL;
- }
-
- /* TLB resize via tlb_fill may have moved the entry. */
- entry = tlb_entry(env, mmu_idx, addr);
- }
- tlb_addr = tlb_read_ofs(entry, elt_ofs);
- }
-
- if (tlb_addr & ~TARGET_PAGE_MASK) {
- /* IO access */
- return NULL;
- }
-
- return (void *)((uintptr_t)addr + entry->addend);
+ /* No combination of flags are expected by the caller. */
+ return flags ? NULL : host;
}
-
#ifdef CONFIG_PLUGIN
/*
* Perform a TLB lookup and populate the qemu_plugin_hwaddr structure.
diff --git a/accel/tcg/user-exec.c b/accel/tcg/user-exec.c
index 03538e2a38..987342c50c 100644
--- a/accel/tcg/user-exec.c
+++ b/accel/tcg/user-exec.c
@@ -190,13 +190,12 @@ static inline int handle_cpu_signal(uintptr_t pc, siginfo_t *info,
g_assert_not_reached();
}
-void *probe_access(CPUArchState *env, target_ulong addr, int size,
- MMUAccessType access_type, int mmu_idx, uintptr_t retaddr)
+static int probe_access_internal(CPUArchState *env, target_ulong addr,
+ int fault_size, MMUAccessType access_type,
+ bool nonfault, uintptr_t ra)
{
int flags;
- g_assert(-(addr | TARGET_PAGE_MASK) >= size);
-
switch (access_type) {
case MMU_DATA_STORE:
flags = PAGE_WRITE;
@@ -212,12 +211,38 @@ void *probe_access(CPUArchState *env, target_ulong addr, int size,
}
if (!guest_addr_valid(addr) || page_check_range(addr, 1, flags) < 0) {
- CPUState *cpu = env_cpu(env);
- CPUClass *cc = CPU_GET_CLASS(cpu);
- cc->tlb_fill(cpu, addr, size, access_type, MMU_USER_IDX, false,
- retaddr);
- g_assert_not_reached();
+ if (nonfault) {
+ return TLB_INVALID_MASK;
+ } else {
+ CPUState *cpu = env_cpu(env);
+ CPUClass *cc = CPU_GET_CLASS(cpu);
+ cc->tlb_fill(cpu, addr, fault_size, access_type,
+ MMU_USER_IDX, false, ra);
+ g_assert_not_reached();
+ }
}
+ return 0;
+}
+
+int probe_access_flags(CPUArchState *env, target_ulong addr,
+ MMUAccessType access_type, int mmu_idx,
+ bool nonfault, void **phost, uintptr_t ra)
+{
+ int flags;
+
+ flags = probe_access_internal(env, addr, 0, access_type, nonfault, ra);
+ *phost = flags ? NULL : g2h(addr);
+ return flags;
+}
+
+void *probe_access(CPUArchState *env, target_ulong addr, int size,
+ MMUAccessType access_type, int mmu_idx, uintptr_t ra)
+{
+ int flags;
+
+ g_assert(-(addr | TARGET_PAGE_MASK) >= size);
+ flags = probe_access_internal(env, addr, size, access_type, false, ra);
+ g_assert(flags == 0);
return size ? g2h(addr) : NULL;
}
diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 49384bb66a..43ddcf024c 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -328,7 +328,18 @@ CPUArchState *cpu_copy(CPUArchState *env);
| CPU_INTERRUPT_TGT_EXT_3 \
| CPU_INTERRUPT_TGT_EXT_4)
-#if !defined(CONFIG_USER_ONLY)
+#ifdef CONFIG_USER_ONLY
+
+/*
+ * Allow some level of source compatibility with softmmu. We do not
+ * support any of the more exotic features, so only invalid pages may
+ * be signaled by probe_access_flags().
+ */
+#define TLB_INVALID_MASK (1 << (TARGET_PAGE_BITS_MIN - 1))
+#define TLB_MMIO 0
+#define TLB_WATCHPOINT 0
+
+#else
/*
* Flags stored in the low bits of the TLB virtual address.
diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index d656a1f05c..8792bea07a 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -362,6 +362,28 @@ static inline void *probe_read(CPUArchState *env, target_ulong addr, int size,
return probe_access(env, addr, size, MMU_DATA_LOAD, mmu_idx, retaddr);
}
+/**
+ * probe_access_flags:
+ * @env: CPUArchState
+ * @addr: guest virtual address to look up
+ * @access_type: read, write or execute permission
+ * @mmu_idx: MMU index to use for lookup
+ * @nonfault: suppress the fault
+ * @phost: return value for host address
+ * @retaddr: return address for unwinding
+ *
+ * Similar to probe_access, loosely returning the TLB_FLAGS_MASK for
+ * the page, and storing the host address for RAM in @phost.
+ *
+ * If @nonfault is set, do not raise an exception but return TLB_INVALID_MASK.
+ * Do not handle watchpoints, but include TLB_WATCHPOINT in the returned flags.
+ * Do handle clean pages, so exclude TLB_NOTDIRY from the returned flags.
+ * For simplicity, all "mmio-like" flags are folded to TLB_MMIO.
+ */
+int probe_access_flags(CPUArchState *env, target_ulong addr,
+ MMUAccessType access_type, int mmu_idx,
+ bool nonfault, void **phost, uintptr_t retaddr);
+
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
/* Estimated block size for TB allocation. */
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-04 10:02:35 +0000