In case when libvirt runs inside a restricted container it may not have enough permissions to modify unpriv_sgio. However, it may have been set beforehand by sysadmin or an orchestration tool. Therefore, let's check whether the currently set value is the one we want and if it is refrain from writing to the file. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2010306 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> --- src/qemu/qemu_conf.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index 916a3d36ee..0451bc70ac 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -1878,9 +1878,17 @@ qemuSetUnprivSGIO(virDomainDeviceDef *dev) * whitelist is enabled. But if requesting unfiltered access, always call * virSetDeviceUnprivSGIO, to report an error for unsupported unpriv_sgio. */ - if ((virFileExists(sysfs_path) || val == 1) && - virSetDeviceUnprivSGIO(path, NULL, val) < 0) - return -1; + if (virFileExists(sysfs_path) || val == 1) { + int curr_val; + + if (virGetDeviceUnprivSGIO(path, NULL, &curr_val) < 0) + return -1; + + if (curr_val != val && + virSetDeviceUnprivSGIO(path, NULL, val) < 0) { + return -1; + } + } return 0; } -- 2.32.0