tpm: mark correct memory region range dirty when clearing RAM

We might not start at the beginning of the memory region. Let's
calculate the offset into the memory region via the difference in the
host addresses.

Acked-by: Stefan Berger <[email protected]>
Fixes: ffab1be ("tpm: clear RAM when "memory overwrite" requested")
Cc: Marc-André Lureau <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: "Michael S. Tsirkin" <[email protected]>
Cc: Eduardo Habkost <[email protected]>
Cc: Alex Williamson <[email protected]>
Cc: Dr. David Alan Gilbert <[email protected]>
Cc: Igor Mammedov <[email protected]>
Cc: Claudio Fontana <[email protected]>
Cc: Thomas Huth <[email protected]>
Cc: "Alex Bennée" <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Laurent Vivier <[email protected]>
Cc: Stefan Berger <[email protected]>
Signed-off-by: David Hildenbrand <[email protected]>
Reviewed-by: Peter Xu <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: davidhildenbrand

hw/tpm/tpm_ppi.c

@@ -30,11 +30,14 @@ void tpm_ppi_reset(TPMPPI *tpmppi)
         guest_phys_blocks_init(&guest_phys_blocks);
         guest_phys_blocks_append(&guest_phys_blocks);
         QTAILQ_FOREACH(block, &guest_phys_blocks.head, next) {
+            hwaddr mr_offs = block->host_addr -
+                             (uint8_t *)memory_region_get_ram_ptr(block->mr);
+
             trace_tpm_ppi_memset(block->host_addr,
                                  block->target_end - block->target_start);
             memset(block->host_addr, 0,
                    block->target_end - block->target_start);
-            memory_region_set_dirty(block->mr, 0,
+            memory_region_set_dirty(block->mr, mr_offs,
                                     block->target_end - block->target_start);
         }
         guest_phys_blocks_free(&guest_phys_blocks);