[RFC PATCH 8/9] KVM: Plumb mmu_notifier invalidation event type into arch code

[Sean Christopherson <seanjc@google.com>]

Forward the mmu_notifier invalidation event information into the arch
handler so that arch code can take different actions based on the
invalidation type.  E.g. x86 will use the information to preserve
Accessed information when zapping SPTEs because of a protection change.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 include/linux/kvm_host.h | 1 +
 virt/kvm/kvm_main.c      | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 006668db9911..1fce5cf73b8e 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -252,6 +252,7 @@ int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
 #ifdef CONFIG_KVM_GENERIC_MMU_NOTIFIER
 union kvm_mmu_notifier_arg {
 	unsigned long attributes;
+	enum mmu_notifier_event event;
 };
 
 struct kvm_gfn_range {
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index e279140f2425..3aa04e785d32 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -719,6 +719,7 @@ static int kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
 		.start		= range->start,
 		.end		= range->end,
 		.handler	= kvm_mmu_unmap_gfn_range,
+		.arg.event	= range->event,
 		.on_lock	= kvm_mmu_invalidate_begin,
 		.flush_on_ret	= true,
 		.may_block	= mmu_notifier_range_blockable(range),
-- 
2.46.0.rc1.232.g9752f9e123-goog