Fix benign races when kicking vCPUs where the task doing the kicking can consume a stale vcpu->cpu. The races are benign because of the impliciations of task migration with respect to interrupts and being in guest mode, but IMO they're worth fixing if only as an excuse to document the flows. Patch 2 is a tangentially related cleanup to prevent future me from trying to get rid of the NULL check on the cpumask parameters, which _looks_ like it can't ever be NULL, but has a subtle edge case due to the way CONFIG_CPUMASK_OFFSTACK=y handles cpumasks. Sean Christopherson (2): KVM: Clean up benign vcpu->cpu data races when kicking vCPUs KVM: Guard cpusmask NULL check with CONFIG_CPUMASK_OFFSTACK virt/kvm/kvm_main.c | 46 ++++++++++++++++++++++++++++++++++++--------- 1 file changed, 37 insertions(+), 9 deletions(-) -- 2.33.0.rc2.250.ged5fa647cd-goog
