From 4080a13c11398d684668d286da27b6f8ee668e44 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Mon, 30 Mar 2015 12:35:00 +0200 Subject: ioport: reserve the whole range of an I/O port in the AddressSpace When an I/O port is more than 1 byte long, ioport.c is currently creating "short" regions, for example 0x1ce-0x1ce for the 16-bit Bochs index port. When I/O ports are memory mapped, and thus accessed via a subpage_ops memory region, subpage_accepts gets confused because it finds a hole at 0x1cf and rejects the access. In order to fix this, modify registration of the region to cover the whole size of the I/O port. Attempts to access an invalid port will be blocked by find_portio returning NULL. This only affects the VBE DISPI regions. For all other cases, the MemoryRegionPortio entries for 2- or 4-byte accesses overlap an entry for 1-byte accesses, thus the size of the memory region is not affected. Reported-by: Zoltan Balaton Signed-off-by: Paolo Bonzini --- ioport.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'ioport.c') diff --git a/ioport.c b/ioport.c index 090c2628ed..304d5d6f59 100644 --- a/ioport.c +++ b/ioport.c @@ -269,7 +269,7 @@ void portio_list_add(PortioList *piolist, /* Handle the first entry specially. */ off_last = off_low = pio_start->offset; - off_high = off_low + pio_start->len; + off_high = off_low + pio_start->len + pio_start->size - 1; count = 1; for (pio = pio_start + 1; pio->size != 0; pio++, count++) { @@ -284,10 +284,10 @@ void portio_list_add(PortioList *piolist, /* ... and start collecting anew. */ pio_start = pio; off_low = off_last; - off_high = off_low + pio->len; + off_high = off_low + pio->len + pio_start->size - 1; count = 0; } else if (off_last + pio->len > off_high) { - off_high = off_last + pio->len; + off_high = off_last + pio->len + pio_start->size - 1; } } -- cgit v1.2.3