Messages in this thread | | | Date | Wed, 3 Aug 2022 17:57:09 +0200 | Subject | Re: [PATCH 0/2] virt: vmgenid: add generation counter | From | "Chalios, Babis" <> |
| |
(Correctly) CC'ing more people in the discussion. Apologies for this.
On 3/8/22 17:21, bchalios@amazon.es wrote: > From: Babis Chalios <bchalios@amazon.es> > > Linux recently added support for the VM Generation ID mechanism from > Microsoft. The way this works currently is using the 128-bit blob > provided by the vmgenid device to re-seed the RNG. While this works it > has two main issues, (a) it is inherently racy due to the fact that it > relies on a ACPI notification being delivered and handled and (b) the ID > is unsuitable for exposing to user-space. > > This patch-set extends the vmgenid device to introduce a generation > counter, a 32-bit counter which is different every time the unique ID > changes. The addition to the original implementation in QEMU can be > found here: > https://lists.nongnu.org/archive/html/qemu-devel/2022-08/msg00524.html. > > The first patch re-works slightly the current vmgenid driver to add a > function that parses an object from the vmgenid device and returns the > physical address of the vmgenid data. The second patch uses that > function to parse additionally the address of the generation counter > from the vmgenid namespace. The counter is then exposed to the > user-space through a misc-device which provides `read` and `mmap` > interfaces. > > Babis Chalios (2): > virt: vmgenid: add helper function to parse ADDR > virt: vmgenid: add support for generation counter > > Documentation/virt/vmgenid.rst | 120 ++++++++++++++++++++++++++ > drivers/virt/vmgenid.c | 151 ++++++++++++++++++++++++++++----- > 2 files changed, 251 insertions(+), 20 deletions(-) > create mode 100644 Documentation/virt/vmgenid.rst >
Amazon Spain Services sociedad limitada unipersonal, Calle Ramirez de Prado 5, 28045 Madrid. Registro Mercantil de Madrid . Tomo 22458 . Folio 102 . Hoja M-401234 . CIF B84570936
| |