On 3/29/23 17:17, Tudor Ambarus wrote:
From: Sean Christophersonseanjc@google.com
commit 98c25ead5eda5e9d41abe57839ad3e8caf19500c upstream.
Handle the switch to/from the hypervisor/software timer when a vCPU is blocking in common x86 instead of in VMX. Even though VMX is the only user of a hypervisor timer, the logic and all functions involved are generic x86 (unless future CPUs do something completely different and implement a hypervisor timer that runs regardless of mode).
Handling the switch in common x86 will allow for the elimination of the pre/post_blocks hooks, and also lets KVM switch back to the hypervisor timer if and only if it was in use (without additional params). Add a comment explaining why the switch cannot be deferred to kvm_sched_out() or kvm_vcpu_block().
Signed-off-by: Sean Christophersonseanjc@google.com Reviewed-by: Maxim Levitskymlevitsk@redhat.com Message-Id:20211208015236.1616697-8-seanjc@google.com Signed-off-by: Paolo Bonzinipbonzini@redhat.com [ta: Fix conflicts in vmx_pre_block and vmx_post_block as per Paolo's suggestion. Add Reported-by and Link tags.] Reported-by:syzbot+b6a74be92b5063a0f1ff@syzkaller.appspotmail.com Link:https://syzkaller.appspot.com/bug?id=489beb3d76ef14cc6cd18125782dc6f86051a60... Tested-by: Tudor Ambarustudor.ambarus@linaro.org Signed-off-by: Tudor Ambarustudor.ambarus@linaro.org
Acked-by: Paolo Bonzini pbonzini@redhat.com