diff options
| author | Juergen Gross <jgross@suse.com> | 2026-05-08 17:39:33 +0300 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2026-05-14 19:33:05 +0300 |
| commit | 4594437880ce347ac8438758fd91543f70da1aa9 (patch) | |
| tree | 7ace2881e34f807aeacf76f91b3ca4ec215a1553 /drivers | |
| parent | 28e03f78e69cf6628b81f24777799778528a84c1 (diff) | |
| download | linux-4594437880ce347ac8438758fd91543f70da1aa9.tar.xz | |
x86/xen: Tolerate nested XEN_LAZY_MMU entering/leaving
With the support of nested lazy mmu sections it can happen that
arch_enter_lazy_mmu_mode() is being called twice without a call of
arch_leave_lazy_mmu_mode() in between, as the lazy_mmu_*() helpers
are not disabling preemption when checking for nested lazy mmu
sections.
This is a problem when running as a Xen PV guest, as
xen_enter_lazy_mmu() and xen_leave_lazy_mmu() don't tolerate this
case.
Fix that in xen_enter_lazy_mmu() and xen_leave_lazy_mmu() in order
not to hurt all other lazy mmu mode users.
Fixes: 291b3abed657 ("x86/xen: use lazy_mmu_state when context-switching")
Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <20260508143933.493013-1-jgross@suse.com>
Diffstat (limited to 'drivers')
0 files changed, 0 insertions, 0 deletions