[PATCH 05/20] virpci: introduce virPCIDeviceExists()
We're going to add logic to handle the case where a previously
existing PCI device does not longer exist in the host.
The logic was copied from virPCIDeviceNew(), which verifies if a
PCI device exists in the host, returning NULL and throwing an
error if it doesn't. The NULL is used for other errors as well
(product/vendor id read errors, dev id overflow), meaning that we
can't re-use virPCIDeviceNew() for the purpose of detecting
if the device exists.
Signed-off-by: Daniel Henrique Barboza <danielhb413(a)gmail.com>
---
src/libvirt_private.syms | 1 +
src/util/virpci.c | 10 ++++++++++
src/util/virpci.h | 1 +
3 files changed, 12 insertions(+)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index fe4ee25f3a..81ce142635 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2817,6 +2817,7 @@ virPCIDeviceAddressIsValid;
virPCIDeviceAddressParse;
virPCIDeviceCopy;
virPCIDeviceDetach;
+virPCIDeviceExists;
virPCIDeviceFileIterate;
virPCIDeviceFree;
virPCIDeviceGetAddress;
diff --git a/src/util/virpci.c b/src/util/virpci.c
index 545b2650a0..1a542b18b6 100644
--- a/src/util/virpci.c
+++ b/src/util/virpci.c
@@ -1448,6 +1448,16 @@ virPCIDeviceAddressAsString(const virPCIDeviceAddress *addr)
return str;
}
+bool
+virPCIDeviceExists(const virPCIDeviceAddress *addr)
+{
+ g_autofree char *devName = virPCIDeviceAddressAsString(addr);
+ g_autofree char *devPath = g_strdup_printf(PCI_SYSFS "devices/%s/config",
+ devName);
+
+ return virFileExists(devPath);
+}
+
virPCIDevicePtr
virPCIDeviceNew(const virPCIDeviceAddress *address)
{
diff --git a/src/util/virpci.h b/src/util/virpci.h
index d4451848c1..a9c597a428 100644
--- a/src/util/virpci.h
+++ b/src/util/virpci.h
@@ -201,6 +201,7 @@ int virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr
devAddr,
size_t *nIommuGroupDevices);
int virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr);
char *virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr);
+bool virPCIDeviceExists(const virPCIDeviceAddress *addr);
char *virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev);
int virPCIDeviceIsAssignable(virPCIDevicePtr dev,
--
2.26.2