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virpci: introduce virPCIDeviceExists()

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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.

Reviewed-by: Laine Stump <laine@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Daniel Henrique Barboza 2021-01-04 09:54:29 -03:00
parent 155151a3d0
commit 3acc65e1b0
3 changed files with 12 additions and 0 deletions
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1
src/libvirt_private.syms
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@ -2924,6 +2924,7 @@ virPCIDeviceAddressIsValid;
virPCIDeviceAddressParse; virPCIDeviceAddressParse;
virPCIDeviceCopy; virPCIDeviceCopy;
virPCIDeviceDetach; virPCIDeviceDetach;
virPCIDeviceExists;
virPCIDeviceFileIterate; virPCIDeviceFileIterate;
virPCIDeviceFree; virPCIDeviceFree;
virPCIDeviceGetAddress; virPCIDeviceGetAddress;

10
src/util/virpci.c
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@ -1448,6 +1448,16 @@ virPCIDeviceAddressAsString(const virPCIDeviceAddress *addr)
return str; 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 virPCIDevicePtr
virPCIDeviceNew(const virPCIDeviceAddress *address) virPCIDeviceNew(const virPCIDeviceAddress *address)
{ {

1
src/util/virpci.h
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@ -206,6 +206,7 @@ int virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr devAddr,
size_t *nIommuGroupDevices); size_t *nIommuGroupDevices);
int virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr); int virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr);
char *virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr); char *virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr);
bool virPCIDeviceExists(const virPCIDeviceAddress *addr);
char *virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev); char *virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev);
int virPCIDeviceIsAssignable(virPCIDevicePtr dev, int virPCIDeviceIsAssignable(virPCIDevicePtr dev,