[xen staging] VT-d: PCI segment numbers are up to 16 bits wide

[patchbot@xxxxxxx]

commit a3dd33e63c2c8c51102f223e6efe2e3d3bdcbec1
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Mon Sep 20 10:25:03 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Sep 20 10:25:03 2021 +0200

    VT-d: PCI segment numbers are up to 16 bits wide
    
    We shouldn't silently truncate respective values.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.c 
b/xen/drivers/passthrough/vtd/iommu.c
index 859e6ddf62..611c22fd52 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -1462,7 +1462,8 @@ static int domain_context_mapping(struct domain *domain, 
u8 devfn,
 {
     const struct acpi_drhd_unit *drhd = acpi_find_matched_drhd_unit(pdev);
     int ret = 0;
-    u8 seg = pdev->seg, bus = pdev->bus, secbus;
+    uint16_t seg = pdev->seg;
+    uint8_t bus = pdev->bus, secbus;
 
     /*
      * Generally we assume only devices from one node to get assigned to a
@@ -1677,7 +1678,8 @@ static int domain_context_unmap(struct domain *domain, u8 
devfn,
     const struct acpi_drhd_unit *drhd = acpi_find_matched_drhd_unit(pdev);
     struct vtd_iommu *iommu = drhd ? drhd->iommu : NULL;
     int ret;
-    u8 seg = pdev->seg, bus = pdev->bus, tmp_bus, tmp_devfn, secbus;
+    uint16_t seg = pdev->seg;
+    uint8_t bus = pdev->bus, tmp_bus, tmp_devfn, secbus;
     bool found;
 
     switch ( pdev->type )
--
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