[Qemu-devel] [PATCH v1 4/9] tcg: Enforce single page access in probe_write() for !CONFIG_USER_ONLY

[David Hildenbrand <david@redhat.com>]

While the CONFIG_USER_ONLY variant can handle multiple pages (no MMU), the
!CONFIG_USER_ONLY variant can't and won't. We'll want to convert
probe_write() to return a host address (similar to tlb_vaddr_to_host())
soon. This only works on page granularity.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 accel/tcg/cputlb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index bb9897b25a..4b49ccb58a 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1064,6 +1064,8 @@ void probe_write(CPUArchState *env, target_ulong addr, int size, int mmu_idx,
     uintptr_t index = tlb_index(env, mmu_idx, addr);
     CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
 
+    g_assert(-(addr | TARGET_PAGE_MASK) >= size);
+
     if (!tlb_hit(tlb_addr_write(entry), addr)) {
         /* TLB entry is for a different page */
         if (!VICTIM_TLB_HIT(addr_write, addr)) {
-- 
2.21.0