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libxl: load on FreeBSD
The libxl tries to check if it's running in dom0 by parsing /proc/xen/capabilities and if that fails it doesn't load. There's no procfs interface in Xen on FreeBSD, so this check always fails. In addition to checking procfs, check if /dev/xen/xenstored, that's enough to check if we're running in dom0 in FreeBSD case.
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@ -74,6 +74,7 @@ VIR_LOG_INIT("libxl.libxl_driver");
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#define LIBXL_CONFIG_FORMAT_SEXPR "xen-sxpr"
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#define HYPERVISOR_CAPABILITIES "/proc/xen/capabilities"
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#define HYPERVISOR_XENSTORED "/dev/xen/xenstored"
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/* Number of Xen scheduler parameters */
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#define XEN_SCHED_CREDIT_NPARAM 2
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@ -427,8 +428,6 @@ static bool
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libxlDriverShouldLoad(bool privileged)
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{
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bool ret = false;
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int status;
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char *output = NULL;
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/* Don't load if non-root */
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if (!privileged) {
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@ -436,24 +435,27 @@ libxlDriverShouldLoad(bool privileged)
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return ret;
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}
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if (!virFileExists(HYPERVISOR_CAPABILITIES)) {
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VIR_INFO("Disabling driver as " HYPERVISOR_CAPABILITIES
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" does not exist");
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return ret;
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}
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/*
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* Don't load if not running on a Xen control domain (dom0). It is not
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* sufficient to check for the file to exist as any guest can mount
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* xenfs to /proc/xen.
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*/
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status = virFileReadAll(HYPERVISOR_CAPABILITIES, 10, &output);
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if (status >= 0)
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status = strncmp(output, "control_d", 9);
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VIR_FREE(output);
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if (status) {
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VIR_INFO("No Xen capabilities detected, probably not running "
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"in a Xen Dom0. Disabling libxenlight driver");
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if (virFileExists(HYPERVISOR_CAPABILITIES)) {
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int status;
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char *output = NULL;
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/*
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* Don't load if not running on a Xen control domain (dom0). It is not
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* sufficient to check for the file to exist as any guest can mount
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* xenfs to /proc/xen.
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*/
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status = virFileReadAll(HYPERVISOR_CAPABILITIES, 10, &output);
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if (status >= 0)
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status = strncmp(output, "control_d", 9);
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VIR_FREE(output);
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if (status) {
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VIR_INFO("No Xen capabilities detected, probably not running "
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"in a Xen Dom0. Disabling libxenlight driver");
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return ret;
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}
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} else if (!virFileExists(HYPERVISOR_XENSTORED)) {
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VIR_INFO("Disabling driver as neither " HYPERVISOR_CAPABILITIES
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" nor " HYPERVISOR_XENSTORED " exist");
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return ret;
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}
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