[PATCH 05/18] KVM: x86/mmu: Pass address space ID to __kvm_tdp_mmu_zap_gfn_range()

From: Sean Christopherson <seanjc@google.com>
To: Marc Zyngier <maz@kernel.org>,
	Huacai Chen <chenhuacai@kernel.org>,
	Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
	Paul Mackerras <paulus@ozlabs.org>,
	Paolo Bonzini <pbonzini@redhat.com>
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Sean Christopherson <seanjc@google.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org,
	kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
	linux-kernel@vger.kernel.org, Ben Gardon <bgardon@google.com>
Subject: [PATCH 05/18] KVM: x86/mmu: Pass address space ID to __kvm_tdp_mmu_zap_gfn_range()
Date: Thu, 25 Mar 2021 19:19:44 -0700	[thread overview]
Message-ID: <20210326021957.1424875-6-seanjc@google.com> (raw)
In-Reply-To: <20210326021957.1424875-1-seanjc@google.com>

Pass the address space ID to TDP MMU's primary "zap gfn range" helper to
allow the MMU notifier paths to iterate over memslots exactly once.
Currently, both the legacy MMU and TDP MMU iterate over memslots when
looking for an overlapping hva range, which can be quite costly if there
are a large number of memslots.

Add a "flush" parameter so that iterating over multiple address spaces
in the caller will continue to do the right thing when yielding while a
flush is pending from a previous address space.

Note, this also has a functional change in the form of coalescing TLB
flushes across multiple address spaces in kvm_zap_gfn_range(), and also
optimizes the TDP MMU to utilize range-based flushing when running as L1
with Hyper-V enlightenments.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/mmu/mmu.c          | 10 ++++------
 arch/x86/kvm/mmu/mmu_internal.h |  5 +++++
 arch/x86/kvm/mmu/tdp_mmu.c      | 22 +++++++++++-----------
 arch/x86/kvm/mmu/tdp_mmu.h      | 13 +++++++------
 4 files changed, 27 insertions(+), 23 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index e6e02360ef67..36c231d6bff9 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5508,17 +5508,15 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
 							KVM_MAX_HUGEPAGE_LEVEL,
 							start, end - 1, true, flush);
 		}
+
+		if (is_tdp_mmu_enabled(kvm))
+			flush = kvm_tdp_mmu_zap_gfn_range(kvm, i, gfn_start,
+							  gfn_end, flush);
 	}
 
 	if (flush)
 		kvm_flush_remote_tlbs_with_address(kvm, gfn_start, gfn_end);
 
-	if (is_tdp_mmu_enabled(kvm)) {
-		flush = kvm_tdp_mmu_zap_gfn_range(kvm, gfn_start, gfn_end);
-		if (flush)
-			kvm_flush_remote_tlbs(kvm);
-	}
-
 	write_unlock(&kvm->mmu_lock);
 }
 
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 5fe9123fc932..db2faa806ab7 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -129,6 +129,11 @@ static inline bool kvm_mmu_put_root(struct kvm *kvm, struct kvm_mmu_page *sp)
 	return !sp->root_count;
 }
 
+static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
+{
+	return sp->role.smm ? 1 : 0;
+}
+
 /*
  * Return values of handle_mmio_page_fault, mmu.page_fault, and fast_page_fault().
  *
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index ff2bb0c8012e..bf279fff70ea 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -190,11 +190,6 @@ static void handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
 				u64 old_spte, u64 new_spte, int level,
 				bool shared);
 
-static int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
-{
-	return sp->role.smm ? 1 : 0;
-}
-
 static void handle_changed_spte_acc_track(u64 old_spte, u64 new_spte, int level)
 {
 	if (!is_shadow_present_pte(old_spte) || !is_last_spte(old_spte, level))
@@ -709,14 +704,16 @@ static bool zap_gfn_range(struct kvm *kvm, struct kvm_mmu_page *root,
  * SPTEs have been cleared and a TLB flush is needed before releasing the
  * MMU lock.
  */
-bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end,
-				 bool can_yield)
+bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start,
+				 gfn_t end, bool can_yield, bool flush)
 {
 	struct kvm_mmu_page *root;
-	bool flush = false;
 
-	for_each_tdp_mmu_root_yield_safe(kvm, root)
+	for_each_tdp_mmu_root_yield_safe(kvm, root) {
+		if (kvm_mmu_page_as_id(root) != as_id)
+			continue;
 		flush = zap_gfn_range(kvm, root, start, end, can_yield, flush);
+	}
 
 	return flush;
 }
@@ -724,9 +721,12 @@ bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end,
 void kvm_tdp_mmu_zap_all(struct kvm *kvm)
 {
 	gfn_t max_gfn = 1ULL << (shadow_phys_bits - PAGE_SHIFT);
-	bool flush;
+	bool flush = false;
+	int i;
+
+	for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
+		flush = kvm_tdp_mmu_zap_gfn_range(kvm, i, 0, max_gfn, flush);
 
-	flush = kvm_tdp_mmu_zap_gfn_range(kvm, 0, max_gfn);
 	if (flush)
 		kvm_flush_remote_tlbs(kvm);
 }
diff --git a/arch/x86/kvm/mmu/tdp_mmu.h b/arch/x86/kvm/mmu/tdp_mmu.h
index 9ecd8f79f861..f224df334382 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.h
+++ b/arch/x86/kvm/mmu/tdp_mmu.h
@@ -8,12 +8,12 @@
 hpa_t kvm_tdp_mmu_get_vcpu_root_hpa(struct kvm_vcpu *vcpu);
 void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root);
 
-bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start, gfn_t end,
-				 bool can_yield);
-static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, gfn_t start,
-					     gfn_t end)
+bool __kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id, gfn_t start,
+				 gfn_t end, bool can_yield, bool flush);
+static inline bool kvm_tdp_mmu_zap_gfn_range(struct kvm *kvm, int as_id,
+					     gfn_t start, gfn_t end, bool flush)
 {
-	return __kvm_tdp_mmu_zap_gfn_range(kvm, start, end, true);
+	return __kvm_tdp_mmu_zap_gfn_range(kvm, as_id, start, end, true, flush);
 }
 static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
 {
@@ -28,7 +28,8 @@ static inline bool kvm_tdp_mmu_zap_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
 	 * requirement), its "step sideways" will always step beyond the bounds
 	 * of the shadow page's gfn range and stop iterating before yielding.
 	 */
-	return __kvm_tdp_mmu_zap_gfn_range(kvm, sp->gfn, end, false);
+	return __kvm_tdp_mmu_zap_gfn_range(kvm, kvm_mmu_page_as_id(sp),
+					   sp->gfn, end, false, false);
 }
 void kvm_tdp_mmu_zap_all(struct kvm *kvm);
 
-- 
2.31.0.291.g576ba9dcdaf-goog

