[RFC PATCH 16/24] KVM: x86/mmu: Allow skipping the gva flush in kvm_mmu_invalidate_addr()

[Yosry Ahmed]

Refactor a helper out of kvm_mmu_invalidate_addr() that allows skipping
the gva flush. This will be used when an invalidation is needed but the
GVA TLB translations that require invalidation are not of the current
context (e.g. when emulating INVLPGA for L1 to flush L2's translations).

No functional change intended.

Signed-off-by: Yosry Ahmed <yosry.ahmed@xxxxxxxxx>
---
 arch/x86/kvm/mmu/mmu.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 4a72ada0a7585..e2b1994f12753 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6355,15 +6355,15 @@ static void kvm_mmu_invalidate_addr_in_root(struct kvm_vcpu *vcpu,
 	write_unlock(&vcpu->kvm->mmu_lock);
 }
 
-void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
-			     u64 addr, unsigned long roots)
+static void __kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+				      u64 addr, unsigned long roots, bool gva_flush)
 {
 	int i;
 
 	WARN_ON_ONCE(roots & ~KVM_MMU_ROOTS_ALL);
 
 	/* It's actually a GPA for vcpu->arch.guest_mmu.  */
-	if (mmu != &vcpu->arch.guest_mmu) {
+	if (gva_flush && mmu != &vcpu->arch.guest_mmu) {
 		/* INVLPG on a non-canonical address is a NOP according to the SDM.  */
 		if (is_noncanonical_invlpg_address(addr, vcpu))
 			return;
@@ -6382,6 +6382,12 @@ void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 			kvm_mmu_invalidate_addr_in_root(vcpu, mmu, addr, mmu->prev_roots[i].hpa);
 	}
 }
+
+void kvm_mmu_invalidate_addr(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+			     u64 addr, unsigned long roots)
+{
+	__kvm_mmu_invalidate_addr(vcpu, mmu, addr, roots, true);
+}
 EXPORT_SYMBOL_GPL(kvm_mmu_invalidate_addr);
 
 void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
-- 
2.49.0.395.g12beb8f557-goog