On Tue, Dec 14, 2010 at 12:02:03PM +0200, Avi Kivity wrote:
> That could certainly be optimized. If the BAR is all along in its
> page, both on guest and host (if not, we can migrate it, at least on
> the host), we can use the same offset within the page on the host as
> it appears on the guest, and assign the entire page.
>
> We should make sure SeaBIOS uses a minimum alignment of 4k for mmio BARs.
Shouldn't be too hard to do that.
-Kevin
--- a/src/pciinit.c
+++ b/src/pciinit.c
@@ -10,6 +10,7 @@
#include "biosvar.h" // GET_EBDA
#include "pci_ids.h" // PCI_VENDOR_ID_INTEL
#include "pci_regs.h" // PCI_COMMAND
+#include "memmap.h" // PAGE_SIZE
#include "dev-i440fx.h"
#define PCI_ROM_SLOT 6
@@ -90,6 +91,8 @@ static int pci_bios_allocate_region(u16 bdf, int region_num)
type = "prefmem";
msg = "decrease BUILD_PCIMEM_SIZE and recompile. size %x";
} else {
+ if (size < PAGE_SIZE)
+ size = PAGE_SIZE;
r = &pci_bios_mem_region;
type = "mem";
msg = "increase BUILD_PCIMEM_SIZE and recompile.";
--
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