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Date: Tue, 9 Oct 2018 11:54:39 +0200 From: Filippo Sironi <sironi@...zon.de> To: sironi@...zon.de, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: [PATCH] KVM: Start populating /sys/hypervisor with KVM entries Start populating /sys/hypervisor with KVM entries when we're running on KVM. This is to replicate functionality that's available when we're running on Xen. Let's start with /sys/hypervisor/uuid, which users prefer over /sys/devices/virtual/dmi/id/product_uuid as a way to recognize a virtual machine, since it's also available when running on Xen HVM and on Xen PV and, on top of that doesn't require root privileges by default. Signed-off-by: Filippo Sironi <sironi@...zon.de> --- drivers/Kconfig | 2 ++ drivers/Makefile | 2 ++ drivers/kvm/Kconfig | 14 ++++++++++++++ drivers/kvm/Makefile | 1 + drivers/kvm/sys-hypervisor.c | 26 ++++++++++++++++++++++++++ 5 files changed, 45 insertions(+) create mode 100644 drivers/kvm/Kconfig create mode 100644 drivers/kvm/Makefile create mode 100644 drivers/kvm/sys-hypervisor.c diff --git a/drivers/Kconfig b/drivers/Kconfig index afc942c54814..597519c5f7c8 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -135,6 +135,8 @@ source "drivers/hv/Kconfig" source "drivers/xen/Kconfig" +source "drivers/kvm/Kconfig" + source "drivers/staging/Kconfig" source "drivers/platform/Kconfig" diff --git a/drivers/Makefile b/drivers/Makefile index 1056f9699192..727205e287fc 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -47,6 +47,8 @@ obj-y += soc/ obj-$(CONFIG_VIRTIO) += virtio/ obj-$(CONFIG_XEN) += xen/ +obj-$(CONFIG_KVM_GUEST) += kvm/ + # regulators early, since some subsystems rely on them to initialize obj-$(CONFIG_REGULATOR) += regulator/ diff --git a/drivers/kvm/Kconfig b/drivers/kvm/Kconfig new file mode 100644 index 000000000000..3fc041df7c11 --- /dev/null +++ b/drivers/kvm/Kconfig @@ -0,0 +1,14 @@ +menu "KVM driver support" + depends on KVM_GUEST + +config KVM_SYS_HYPERVISOR + bool "Create KVM entries under /sys/hypervisor" + depends on SYSFS + select SYS_HYPERVISOR + default y + help + Create KVM entries under /sys/hypervisor (e.g., uuid). When running + native or on another hypervisor, /sys/hypervisor may still be + present, but it will have no KVM entries. + +endmenu diff --git a/drivers/kvm/Makefile b/drivers/kvm/Makefile new file mode 100644 index 000000000000..73a43fc994b9 --- /dev/null +++ b/drivers/kvm/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_KVM_SYS_HYPERVISOR) += sys-hypervisor.o diff --git a/drivers/kvm/sys-hypervisor.c b/drivers/kvm/sys-hypervisor.c new file mode 100644 index 000000000000..ef04ca65cf1a --- /dev/null +++ b/drivers/kvm/sys-hypervisor.c @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <asm/kvm_para.h> + +#include <linux/dmi.h> +#include <linux/kobject.h> +#include <linux/sysfs.h> + +static ssize_t uuid_show(struct kobject *obj, + struct kobj_attribute *attr, + char *buf) +{ + const char *uuid = dmi_get_system_info(DMI_PRODUCT_UUID); + return sprintf(buf, "%s\n", uuid); +} + +static struct kobj_attribute uuid = __ATTR_RO(uuid); + +static int __init uuid_init(void) +{ + if (!kvm_para_available()) + return 0; + return sysfs_create_file(hypervisor_kobj, &uuid.attr); +} + +device_initcall(uuid_init); -- 2.7.4
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