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Subject: [PATCH v5 7/7] RFC: add initial support for configuring feature bits
After adding the concept of a management and a managed device, add another example of using this concept to manage resources. Today there is no standard definition in the spec that allows user to setup specific feature bits of a virtio device. For that, extend the management mechanism to allow management devices to change feature bits of its managed devices. Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com> --- admin.tex | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/admin.tex b/admin.tex index 5b54743..43106ba 100644 --- a/admin.tex +++ b/admin.tex @@ -113,7 +113,9 @@ \subsection{VIRTIO ADMIN DEVICE CAPS IDENTIFY command}\label{sec:Basic Facilitie * Bit 0 - if set, the device is a management device * Bit 1 - if set, the device is a type 1 management device that supports * MSI-X vector mgmt of its type 1 managed devices - * Bits 2 - 63 - reserved for future capabilities. + * Bit 2 - if set, the device is a type 1 management device that supports + * feature mgmt of bits 0 to 63 for its type 1 managed devices + * Bits 3 - 63 - reserved for future capabilities. */ le64 device_admin_caps; u8 reserved[112]; @@ -143,7 +145,9 @@ \subsection{VIRTIO ADMIN DEVICE CAPS ACCEPT command}\label{sec:Basic Facilities * Bit 0 - if set, the driver accepted the device as a management device * Bit 1 - if set, the driver accepted the device as a type 1 management device * that supports MSI-X vector mgmt of its type 1 managed devices - * Bits 2 - 63 - reserved for future capabilities. + * Bit 2 - if set, the driver accepted the device as a type 1 management device + * that supports feature mgmt of bits 0 to 63 for its type 1 managed devices + * Bits 3 - 63 - reserved for future capabilities. */ le64 driver_admin_caps; u8 reserved[112]; @@ -167,12 +171,14 @@ \subsection{VIRTIO ADMIN DEVICE MGMT command}\label{sec:Basic Facilities of a Vi u8 operation; /* * 0 - MSI-X vector - * 1 - 65535 are reserved + * 1 - Device feature bits 0 to 63 + * 2 - 65535 are reserved */ le16 resource; /* * The value to the given resource: * if resource = 0 (MSI-X vector), it's a 1-based count. + * if resource = 1 (Device feature bits 0 to 63), it's a feature bitmap. */ le64 resource_val; u8 reserved[5]; -- 2.21.0
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