hvmloader: Fix check for needing a 64-bit bar

After attempting to resize the MMIO hole, the check to determine
whether there is a need to relocate BARs into 64-bit space checks the
specific thing that caused the loop to exit (MMIO hole == 2GiB) rather
than checking whether the required MMIO will fit in the hole.

But even then it does it wrong: the polarity of the check is
backwards.

Check for the actual condition we care about (the sizeof the MMIO
hole) rather than checking for the loop exit condition.

v3:
 - Move earlier in the series, before other functional changes

Signed-off-by: George Dunlap <george.dunlap@eu.citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Ian Jackson <ian.jackson@citrix.com>
CC: Ian Campbell <ian.campbell@citrix.com>
CC: Stefano Stabellini <stefano.stabellini@citrix.com>
CC: Hanweidong <hanweidong@huawei.com>
CC: Keir Fraser <keir@xen.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/firmware/hvmloader/pci.c b/tools/firmware/hvmloader/pci.c
index a3d03ed40c..6792ed47a4 100644
--- a/tools/firmware/hvmloader/pci.c
+++ b/tools/firmware/hvmloader/pci.c
@@ -213,7 +213,7 @@ void pci_setup(void)
             ((pci_mem_start << 1) != 0) )
         pci_mem_start <<= 1;
 
-    if ( (pci_mem_start << 1) != 0 )
+    if ( mmio_total > (pci_mem_end - pci_mem_start) )
     {
         printf("Low MMIO hole not large enough for all devices,"
                " relocating some BARs to 64-bit\n");