virtio — archive

[Pawel Moll]

This patch addresses VIRTIO-47, adding explicit description of the device behaviour when being reset. Signed-off-by: Pawel Moll <pawel.moll@arm.com> --- virtio-v1.0-wd01-part1-specification.txt 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt index c2052ec..07d3a4d 100644 --- a/virtio-v1.0-wd01-part1-specification.txt +++ b/virtio-v1.0-wd01-part1-specification.txt @@ -1451,8 +1451,10 @@ configuration space. The following list presents their layout: flags. Writing non-zero values to this register sets the status flags, indicating the Guest progress. Writing zero (0x0) to this - register triggers a device reset. - Also see "2.2.1. Device Initialization". + register triggers a device reset, including clearing all + bits in the InterruptStatus register and ready bits in the + QueueReady register for all queues in the device. + See also p. 2.3.2.3.1. "Device Initialization". * 0x080 W QueueDescLow 0x084 W QueueDescHigh @@ -1516,6 +1518,9 @@ If both values are valid, it must read the DeviceID register and if its value is zero (0x0) must abort initialization and must not access any other register. +Further initialization must follow the procedure described in +p. 2.2.1. "Device Initialization". + 2.3.2.3.2. Virtqueue Configuration ---------------------------------- @@ -1658,6 +1663,14 @@ nor behaviour: * 0x064 W InterruptACK * 0x070 RW Status + Device status. + Reading from this register returns the current device status + flags. + Writing non-zero values to this register sets the status flags, + indicating the Guest progress. Writing zero (0x0) to this + register triggers a device reset. This should include + setting QueuePFN to zero (0x0) for all queues in the device. + Also see "2.2.1. Device Initialization". * 0x100+ RW Config -- 1.8.1.2