diff options
| author | David Woodhouse <dwmw@amazon.co.uk> | 2023-01-11 18:06:48 +0000 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-01-11 13:32:21 -0500 |
| commit | 23e60258aeafb04e5dd813f03cb0c8ab7b01462a (patch) | |
| tree | 65a89b3df863d272ce0d6677862e6c558b6a5f0c /virt | |
| parent | 71d0393576e9e1ef536c3bc3cf11f661c58dded9 (diff) | |
| download | linux-23e60258aeafb04e5dd813f03cb0c8ab7b01462a.tar.bz2 | |
KVM: x86/xen: Fix lockdep warning on "recursive" gpc locking
In commit 5ec3289b31 ("KVM: x86/xen: Compatibility fixes for shared runstate
area") we declared it safe to obtain two gfn_to_pfn_cache locks at the same
time:
/*
* The guest's runstate_info is split across two pages and we
* need to hold and validate both GPCs simultaneously. We can
* declare a lock ordering GPC1 > GPC2 because nothing else
* takes them more than one at a time.
*/
However, we forgot to tell lockdep. Do so, by setting a subclass on the
first lock before taking the second.
Fixes: 5ec3289b31 ("KVM: x86/xen: Compatibility fixes for shared runstate area")
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20230111180651.14394-1-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions