** Changed in: linux-azure-4.15 (Ubuntu Bionic)
Status: In Progress => Fix Committed
** Changed in: linux-azure (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1913294
Title:
Sync FSGSBASE patches in azure kernel with mainline
Status in linux-azure package in Ubuntu:
In Progress
Status in linux-azure-4.15 package in Ubuntu:
In Progress
Status in linux-azure source package in Bionic:
Invalid
Status in linux-azure-4.15 source package in Bionic:
Fix Committed
Status in linux-azure source package in Focal:
Fix Committed
Status in linux-azure-4.15 source package in Focal:
Invalid
Status in linux-azure source package in Groovy:
Invalid
Status in linux-azure-4.15 source package in Groovy:
Invalid
Bug description:
[Impact]
To include the missing upstream patches to the 4.15 and 5.4 kernel.
* x86/entry/64: Do not use RDPID in paranoid entry to accommodate KVM:
- occasional random failure when running KVM
* x86/fsgsbase/64: Fix NULL deref in 86_fsgsbase_read_task
- Google folks found this when running their fuzzy test cases. Don't know how
realistic this can hit.
* x86/fsgsbase: Fix Xen PV support
* x86/process/64: Make save_fsgs_for_kvm() ready for FSGSBASE
- these two are for VMMs.
Some of these are already included in our azure kernels. 5.8 doesn't
need them because we already synced with upstream while preparing it.
[Test Case]
Since we are syncing with mainline a boot test and a regression test
in ACC instances should be enough to confirm the changes are working.
Since these instances are not publicly available yet, Msft is helping
us to test this changes.
[Where problems could occur]
This affects the SGX driver that is only available on ACC instances
(which is not widely used yet).
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