From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Filippo Sironi <sironi@amazon.de>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
boris.ostrovsky@oracle.com, cohuck@redhat.com,
konrad.wilk@oracle.com, xen-devel@lists.xenproject.org,
vasu.srinivasan@oracle.com
Subject: Re: [PATCH v2 1/2] KVM: Start populating /sys/hypervisor with KVM entries
Date: Tue, 14 May 2019 17:26:36 +0200 [thread overview]
Message-ID: <d03f6be5-d8dc-4389-e14c-295f36a68827__45947.1829862864$1557847669$gmane$org@de.ibm.com> (raw)
In-Reply-To: <1557847002-23519-2-git-send-email-sironi@amazon.de>
On 14.05.19 17:16, Filippo Sironi wrote:
> Start populating /sys/hypervisor with KVM entries when we're running on
> KVM. This is to replicate functionality that's available when we're
> running on Xen.
>
> Start with /sys/hypervisor/uuid, which users prefer over
> /sys/devices/virtual/dmi/id/product_uuid as a way to recognize a virtual
> machine, since it's also available when running on Xen HVM and on Xen PV
> and, on top of that doesn't require root privileges by default.
> Let's create arch-specific hooks so that different architectures can
> provide different implementations.
>
> Signed-off-by: Filippo Sironi <sironi@amazon.de>
> ---
> v2:
> * move the retrieval of the VM UUID out of uuid_show and into
> kvm_para_get_uuid, which is a weak function that can be overwritten
>
> drivers/Kconfig | 2 ++
> drivers/Makefile | 2 ++
> drivers/kvm/Kconfig | 14 ++++++++++++++
> drivers/kvm/Makefile | 1 +
> drivers/kvm/sys-hypervisor.c | 30 ++++++++++++++++++++++++++++++
> 5 files changed, 49 insertions(+)
> create mode 100644 drivers/kvm/Kconfig
> create mode 100644 drivers/kvm/Makefile
> create mode 100644 drivers/kvm/sys-hypervisor.c
>
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 45f9decb9848..90eb835fe951 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -146,6 +146,8 @@ source "drivers/hv/Kconfig"
>
> source "drivers/xen/Kconfig"
>
> +source "drivers/kvm/Kconfig"
> +
> source "drivers/staging/Kconfig"
>
> source "drivers/platform/Kconfig"
> diff --git a/drivers/Makefile b/drivers/Makefile
> index c61cde554340..79cc92a3f6bf 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -44,6 +44,8 @@ obj-y += soc/
> obj-$(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..43b1d1a09807
> --- /dev/null
> +++ b/drivers/kvm/sys-hypervisor.c
> @@ -0,0 +1,30 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#include <asm/kvm_para.h>
> +
> +#include <linux/kobject.h>
> +#include <linux/sysfs.h>
> +
> +__weak const char *kvm_para_get_uuid(void)
> +{
> + return NULL;
> +}
> +
> +static ssize_t uuid_show(struct kobject *obj,
> + struct kobj_attribute *attr,
> + char *buf)
> +{
> + const char *uuid = kvm_para_get_uuid();
I would prefer to have kvm_para_get_uuid return a uuid_t
but char * will probably work out as well.
> + return sprintf(buf, "%s\n", uuid);
> +}
> +
> +static struct kobj_attribute uuid = __ATTR_RO(uuid);
> +
> +static int __init uuid_init(void)
> +{
> + if (!kvm_para_available())
Isnt kvm_para_available a function that is defined in the context of the HOST
and not of the guest?
> + return 0;
> + return sysfs_create_file(hypervisor_kobj, &uuid.attr);
> +}
> +
> +device_initcall(uuid_init);
>
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next prev parent reply other threads:[~2019-05-14 15:26 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1539078879-4372-1-git-send-email-sironi@amazon.de>
[not found] ` <c81b65ba-c562-1869-483b-aee5229501e0@de.ibm.com>
2018-10-09 16:21 ` [PATCH] KVM: Start populating /sys/hypervisor with KVM entries Boris Ostrovsky
[not found] ` <61740f41-c7e3-edaf-68ac-2e4c4a99523b@oracle.com>
2018-10-09 17:50 ` Cornelia Huck
2019-05-14 15:16 ` [Xen-devel] " Filippo Sironi
2019-05-14 15:16 ` [Xen-devel] [PATCH v2 1/2] " Filippo Sironi
2019-05-14 15:26 ` Christian Borntraeger
2019-05-14 16:09 ` Sironi, Filippo
2019-05-14 16:09 ` [Xen-devel] " Sironi, Filippo
2019-05-14 16:31 ` Christian Borntraeger
2019-05-14 16:31 ` [Xen-devel] " Christian Borntraeger
2019-05-14 22:08 ` Sironi, Filippo
2019-05-14 22:08 ` [Xen-devel] " Sironi, Filippo
2019-05-14 15:26 ` Christian Borntraeger [this message]
2019-05-16 13:50 ` Alexander Graf
2019-05-16 14:02 ` Andrew Cooper
2019-05-16 14:02 ` [Xen-devel] " Andrew Cooper
2019-05-16 14:08 ` Alexander Graf
2019-05-16 14:08 ` [Xen-devel] " Alexander Graf
2019-05-16 15:02 ` Boris Ostrovsky
2019-05-16 15:14 ` Sironi, Filippo
2019-05-16 15:14 ` [Xen-devel] " Sironi, Filippo
2019-05-16 15:02 ` Boris Ostrovsky
2019-05-17 15:41 ` [Xen-devel] " Sironi, Filippo
2019-05-31 9:06 ` Alexander Graf
2019-05-31 9:12 ` Raslan, KarimAllah
2019-05-31 9:26 ` Alexander Graf
2019-05-31 9:26 ` Alexander Graf
2019-05-31 9:38 ` [Xen-devel] " Marc Zyngier
2019-05-31 9:38 ` Marc Zyngier
2019-05-31 9:12 ` Raslan, KarimAllah
2019-05-31 9:06 ` Alexander Graf
2019-05-17 15:41 ` Sironi, Filippo
2019-05-16 13:50 ` Alexander Graf
2019-05-14 15:16 ` Filippo Sironi
2019-05-14 15:16 ` [Xen-devel] [PATCH v2 2/2] KVM: x86: Implement the arch-specific hook to report the VM UUID Filippo Sironi
2019-05-16 13:56 ` Alexander Graf
2019-05-16 15:25 ` Sironi, Filippo
2019-05-16 15:33 ` Alexander Graf
2019-05-16 16:40 ` Boris Ostrovsky
2019-05-16 17:41 ` Sironi, Filippo
2019-05-16 17:49 ` Alexander Graf
2019-05-16 17:49 ` Alexander Graf
2019-05-16 17:41 ` Sironi, Filippo
2019-05-16 16:40 ` Boris Ostrovsky
2019-05-16 15:33 ` Alexander Graf
2019-05-16 15:25 ` Sironi, Filippo
2019-05-16 13:56 ` Alexander Graf
2019-05-14 15:16 ` Filippo Sironi
2019-05-14 15:16 ` KVM: Start populating /sys/hypervisor with KVM entries Filippo Sironi
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