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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. Reviewed-by: Laine Stump <laine@redhat.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
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@ -2924,6 +2924,7 @@ virPCIDeviceAddressIsValid;
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virPCIDeviceAddressParse;
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virPCIDeviceCopy;
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virPCIDeviceDetach;
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virPCIDeviceExists;
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virPCIDeviceFileIterate;
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virPCIDeviceFree;
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virPCIDeviceGetAddress;
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@ -1448,6 +1448,16 @@ virPCIDeviceAddressAsString(const virPCIDeviceAddress *addr)
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return str;
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}
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bool
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virPCIDeviceExists(const virPCIDeviceAddress *addr)
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{
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g_autofree char *devName = virPCIDeviceAddressAsString(addr);
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g_autofree char *devPath = g_strdup_printf(PCI_SYSFS "devices/%s/config",
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devName);
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return virFileExists(devPath);
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}
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virPCIDevicePtr
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virPCIDeviceNew(const virPCIDeviceAddress *address)
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{
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@ -206,6 +206,7 @@ int virPCIDeviceAddressGetIOMMUGroupAddresses(virPCIDeviceAddressPtr devAddr,
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size_t *nIommuGroupDevices);
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int virPCIDeviceAddressGetIOMMUGroupNum(virPCIDeviceAddressPtr addr);
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char *virPCIDeviceAddressGetIOMMUGroupDev(const virPCIDeviceAddress *devAddr);
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bool virPCIDeviceExists(const virPCIDeviceAddress *addr);
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char *virPCIDeviceGetIOMMUGroupDev(virPCIDevicePtr dev);
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int virPCIDeviceIsAssignable(virPCIDevicePtr dev,
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