KVM: arm64: Turn vcpu->arch.pause into a counter

We have situations where we can call kvm_arm_halt_guest() without
holding config_lock, which means that halt and resume can overlap in
funny ways when called from separate contexts, and result in situations
where a vcpu is resumed while other parts of KVM assume it is halted.
Consequences are left to the imagination of the reader.

Fix this sorry situation by turning kvm_vcpu_arch::pause into an
atomic counter, which makes the races described above harmless.

Fixes: 3b92830ad41b2 ("KVM: arm/arm64: implement kvm_arm_[halt,resume]_guest")
Reviewed-by: Fuad Tabba <fuad.tabba@linux.dev>
Tested-by: Fuad Tabba <fuad.tabba@linux.dev>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20261015100539.1011760-5-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>

0 files changed, 0 insertions, 0 deletions