xen: add sysfs node for guest type
Currently there is no reliable user interface inside a Xen guest to determine its type (e.g. HVM, PV or PVH). Instead of letting user mode try to determine this by various rather hacky mechanisms (parsing of boot messages before they are gone, trying to make use of known subtle differences in behavior of some instructions), add a sysfs node /sys/hypervisor/guest_type to explicitly deliver this information as it is known to the kernel. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Juergen Gross <jgross@suse.com>
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@ -1,8 +1,19 @@
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What: /sys/hypervisor/guest_type
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Date: May 2017
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KernelVersion: 4.13
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Contact: xen-devel@lists.xenproject.org
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Description: If running under Xen:
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Type of guest:
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"Xen": standard guest type on arm
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"HVM": fully virtualized guest (x86)
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"PV": paravirtualized guest (x86)
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"PVH": fully virtualized guest without legacy emulation (x86)
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What: /sys/hypervisor/pmu/pmu_mode
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What: /sys/hypervisor/pmu/pmu_mode
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Date: August 2015
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Date: August 2015
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KernelVersion: 4.3
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KernelVersion: 4.3
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Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Description:
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Description: If running under Xen:
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Describes mode that Xen's performance-monitoring unit (PMU)
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Describes mode that Xen's performance-monitoring unit (PMU)
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uses. Accepted values are
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uses. Accepted values are
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"off" -- PMU is disabled
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"off" -- PMU is disabled
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@ -17,7 +28,7 @@ What: /sys/hypervisor/pmu/pmu_features
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Date: August 2015
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Date: August 2015
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KernelVersion: 4.3
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KernelVersion: 4.3
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Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Description:
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Description: If running under Xen:
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Describes Xen PMU features (as an integer). A set bit indicates
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Describes Xen PMU features (as an integer). A set bit indicates
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that the corresponding feature is enabled. See
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that the corresponding feature is enabled. See
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include/xen/interface/xenpmu.h for available features
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include/xen/interface/xenpmu.h for available features
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@ -13984,7 +13984,7 @@ F: arch/x86/include/asm/xen/
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F: include/xen/
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F: include/xen/
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F: include/uapi/xen/
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F: include/uapi/xen/
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F: Documentation/ABI/stable/sysfs-hypervisor-xen
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F: Documentation/ABI/stable/sysfs-hypervisor-xen
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F: Documentation/ABI/testing/sysfs-hypervisor-pmu
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F: Documentation/ABI/testing/sysfs-hypervisor-xen
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XEN HYPERVISOR ARM
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XEN HYPERVISOR ARM
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M: Stefano Stabellini <sstabellini@kernel.org>
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M: Stefano Stabellini <sstabellini@kernel.org>
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@ -50,6 +50,35 @@ static int __init xen_sysfs_type_init(void)
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return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
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return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
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}
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}
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static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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const char *type;
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switch (xen_domain_type) {
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case XEN_NATIVE:
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/* ARM only. */
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type = "Xen";
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break;
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case XEN_PV_DOMAIN:
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type = "PV";
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break;
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case XEN_HVM_DOMAIN:
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type = xen_pvh_domain() ? "PVH" : "HVM";
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break;
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default:
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return -EINVAL;
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}
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return sprintf(buffer, "%s\n", type);
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}
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HYPERVISOR_ATTR_RO(guest_type);
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static int __init xen_sysfs_guest_type_init(void)
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{
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return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
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}
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/* xen version attributes */
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/* xen version attributes */
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static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
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static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
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{
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{
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@ -471,6 +500,9 @@ static int __init hyper_sysfs_init(void)
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ret = xen_sysfs_type_init();
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ret = xen_sysfs_type_init();
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if (ret)
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if (ret)
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goto out;
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goto out;
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ret = xen_sysfs_guest_type_init();
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if (ret)
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goto guest_type_out;
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ret = xen_sysfs_version_init();
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ret = xen_sysfs_version_init();
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if (ret)
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if (ret)
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goto version_out;
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goto version_out;
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@ -502,6 +534,8 @@ uuid_out:
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comp_out:
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comp_out:
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sysfs_remove_group(hypervisor_kobj, &version_group);
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sysfs_remove_group(hypervisor_kobj, &version_group);
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version_out:
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version_out:
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sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
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guest_type_out:
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sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
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sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
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out:
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out:
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return ret;
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return ret;
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