qm pci passthrough: follow up enhancements

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/qm-pci-passthrough.adoc b/qm-pci-passthrough.adoc
index 517d979162d667cff127d6ec2a2697d7bb50eb7b..43b9ddcd38c5fd3a1c65ae4b3fac2d67e91094e3 100644 (file)
--- a/qm-pci-passthrough.adoc
+++ b/qm-pci-passthrough.adoc
@@ -276,32 +276,34 @@ to enable this feature in the BIOS/EFI first, or to use a specific PCI(e) port
 for it to work. In doubt, consult the manual of the platform or contact its
 vendor.
 
 for it to work. In doubt, consult the manual of the platform or contact its
 vendor.
 

-Mediated Devices, vGPU/GVT-g
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Mediated Devices (vGPU, GVT-g)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 
 

-Mediated devices are another method to use virtualized hardware.
-These are found most common in virtualized GPU setups such as
-Intels GVT-g and Nvidias vGPUs used in their GRID technology.
+Mediated devices are another method to use reuse features and performance from
+physical hardware for virtualized hardware. These are found most common in
+virtualized GPU setups such as Intels GVT-g and Nvidias vGPUs used in their
+GRID technology.
+
+With this, a physical Card is able to create virtual cards, similar to SR-IOV.
+The difference is that mediated devices do not appear as PCI(e) devices in the
+host, and are such only suited for using in virtual machines.

 
 

-With this, a physical Card is able to create virtual cards, similar to
-SR-IOV, the difference is that mediated devices do not appear as PCI(e) devices
-in the host, and are such only suited for using in virtual machines.

 
 Host Configuration
 ^^^^^^^^^^^^^^^^^^
 
 
 Host Configuration
 ^^^^^^^^^^^^^^^^^^
 

-In general your driver of the card must support that feature, otherwise it will
+In general your card's driver must support that feature, otherwise it will

 not work. So please refer to your vendor for compatbile drivers and how to
 configure them.
 
 Intels drivers for GVT-g are integraded in the Kernel and should work
 not work. So please refer to your vendor for compatbile drivers and how to
 configure them.
 
 Intels drivers for GVT-g are integraded in the Kernel and should work

-with 5th, 6th and 7th generation Intel Core Processors and E3 v4, E3 v5 and
-E3 v6 Xeon Processors.
+with the 5th, 6th and 7th generation Intel Core Processors, further E3 v4, E3
+v5 and E3 v6 Xeon Processors are supported.

 
 To enable it for Intel Graphcs, you have to make sure to load the module
 'kvmgt' (for example via `/etc/modules`) and to enable it on the Kernel
 
 To enable it for Intel Graphcs, you have to make sure to load the module
 'kvmgt' (for example via `/etc/modules`) and to enable it on the Kernel

-commandline. For this you can edit `'/etc/default/grub''
-and add the following to the 'GRUB_CMDLINE_LINUX_DEFAULT' variable:
+commandline. For this you can edit `'/etc/default/grub'' and add the following
+to the 'GRUB_CMDLINE_LINUX_DEFAULT' variable:

 
 ----
  i915.enable_gvt=1
 
 ----
  i915.enable_gvt=1


@@ -315,13 +317,11 @@ reboot your host.
 VM Configuration
 ^^^^^^^^^^^^^^^^
 
 VM Configuration
 ^^^^^^^^^^^^^^^^
 

-To use a mediated device, simply specify the `mdev` on a `hostpciX`
-configuration of a VM. This needs to be a type of mediated device supported
-by the specified PCI(e) card.
+To use a mediated device, simply specify the `mdev` property on a `hostpciX`
+VM configuration option.

 
 

-You can get the supported devices via the 'sysfs'. For example, listing
-the supported types for the device '0000:00:02.0' you can simply list them
-with:
+You can get the supported devices via the 'sysfs'. For example, to list the
+supported types for the device '0000:00:02.0' you would simply execute:

 
 ----
 # ls /sys/bus/pci/devices/0000:00:02.0/mdev_supported_types
 
 ----
 # ls /sys/bus/pci/devices/0000:00:02.0/mdev_supported_types


@@ -329,13 +329,13 @@ with:
 
 Each entry is a directory which contains the following important files:
 
 
 Each entry is a directory which contains the following important files:
 

-* 'available_instances' contains the amount of still available instances of this
-type
+* 'available_instances' contains the amount of still available instances of
+this type, each 'mdev' use in a VM reduces this.

 * 'description' contains a short description about the capabilities of the type
 * 'description' contains a short description about the capabilities of the type

-* 'create' is the endpoint to create such a device, in {pve} this happens
-automatically if you specify a type with a 'hostpciX' line.
+* 'create' is the endpoint to create such a device, {pve} does this
+automatically for you, if a 'hostpciX' option with `mdev` is configured.

 
 

-Example configuration of a Intel GVT-g vGPU on an Intel Skylake 6700k Processor:
+Example configuration with an `Intel GVT-g vGPU` (`Intel Skylake 6700k`):

 
 ----
 # qm set VMID -hostpci0 00:02.0,mdev=i915-GVTg_V5_4
 
 ----
 # qm set VMID -hostpci0 00:02.0,mdev=i915-GVTg_V5_4