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[PULL,04/15] xen_pt: Present the size of 64 bit BARs correctly

Message ID 1526931304-7289-4-git-send-email-sstabellini@kernel.org
State New
Headers show
Series [PULL,01/15] xen-pvdevice: Introduce a simplistic xen-pvdevice save state | expand

Commit Message

Stefano Stabellini May 21, 2018, 7:34 p.m. UTC 
From: Ross Lagerwall <ross.lagerwall@citrix.com>

The full size of the BAR is stored in the lower PCIIORegion.size. The
upper PCIIORegion.size is 0.  Calculate the size of the upper half
correctly from the lower half otherwise the size read by the guest will
be incorrect.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
---
 hw/xen/xen_pt_config_init.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/hw/xen/xen_pt_config_init.c b/hw/xen/xen_pt_config_init.c
index a3ce33e..aee31c6 100644
--- a/hw/xen/xen_pt_config_init.c
+++ b/hw/xen/xen_pt_config_init.c
@@ -504,6 +504,8 @@  static int xen_pt_bar_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
         bar_ro_mask = XEN_PT_BAR_IO_RO_MASK | (r_size - 1);
         break;
     case XEN_PT_BAR_FLAG_UPPER:
+        assert(index > 0);
+        r_size = d->io_regions[index - 1].size >> 32;
         bar_emu_mask = XEN_PT_BAR_ALLF;
         bar_ro_mask = r_size ? r_size - 1 : 0;
         break;