linux-kernel - [PATCH RFC 2/4] KVM: MIPS: Drop flush_shadow

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Message-Id: <20200207223520.735523-3-peterx@redhat.com>
Date:   Fri,  7 Feb 2020 17:35:18 -0500
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        linux-mips@...r.kernel.org, peterx@...hat.com,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH RFC 2/4] KVM: MIPS: Drop flush_shadow_memslot() callback

The MIPS flush_shadow_memslot() callback is always calling the
flush_shadow_all() implementation no matter for trap-emul or VZ.
Delete it and call flush_shadow_all() instead.

This patch prepares for a further replacement of letting MIPS to use
the common kvm_flush_remote_tlbs() call in all places.

No functional change expected.

Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/mips/include/asm/kvm_host.h | 7 -------
 arch/mips/kvm/mips.c             | 8 ++++----
 arch/mips/kvm/trap_emul.c        | 7 -------
 arch/mips/kvm/vz.c               | 7 -------
 4 files changed, 4 insertions(+), 25 deletions(-)

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index 41204a49cf95..e95faffb23d8 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -786,13 +786,6 @@ struct kvm_mips_callbacks {
 	void (*vcpu_uninit)(struct kvm_vcpu *vcpu);
 	int (*vcpu_setup)(struct kvm_vcpu *vcpu);
 	void (*flush_shadow_all)(struct kvm *kvm);
-	/*
-	 * Must take care of flushing any cached GPA PTEs (e.g. guest entries in
-	 * VZ root TLB, or T&E GVA page tables and corresponding root TLB
-	 * mappings).
-	 */
-	void (*flush_shadow_memslot)(struct kvm *kvm,
-				     const struct kvm_memory_slot *slot);
 	gpa_t (*gva_to_gpa)(gva_t gva);
 	void (*queue_timer_int)(struct kvm_vcpu *vcpu);
 	void (*dequeue_timer_int)(struct kvm_vcpu *vcpu);
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 2606f3f02b54..1d5e7ffda746 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -216,7 +216,7 @@ void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
 	kvm_mips_flush_gpa_pt(kvm, slot->base_gfn,
 			      slot->base_gfn + slot->npages - 1);
 	/* Let implementation do the rest */
-	kvm_mips_callbacks->flush_shadow_memslot(kvm, slot);
+	kvm_mips_callbacks->flush_shadow_all(kvm);
 	spin_unlock(&kvm->mmu_lock);
 }
 
@@ -258,7 +258,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 					new->base_gfn + new->npages - 1);
 		/* Let implementation do the rest */
 		if (needs_flush)
-			kvm_mips_callbacks->flush_shadow_memslot(kvm, new);
+			kvm_mips_callbacks->flush_shadow_all(kvm);
 		spin_unlock(&kvm->mmu_lock);
 	}
 }
@@ -1003,7 +1003,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
 		memslot = id_to_memslot(slots, log->slot);
 
 		/* Let implementation handle TLB/GVA invalidation */
-		kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot);
+		kvm_mips_callbacks->flush_shadow_all(kvm);
 	}
 
 	mutex_unlock(&kvm->slots_lock);
@@ -1026,7 +1026,7 @@ int kvm_vm_ioctl_clear_dirty_log(struct kvm *kvm, struct kvm_clear_dirty_log *lo
 		memslot = id_to_memslot(slots, log->slot);
 
 		/* Let implementation handle TLB/GVA invalidation */
-		kvm_mips_callbacks->flush_shadow_memslot(kvm, memslot);
+		kvm_mips_callbacks->flush_shadow_all(kvm);
 	}
 
 	mutex_unlock(&kvm->slots_lock);
diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c
index 5a11e83dffe6..2ecb430ea0f1 100644
--- a/arch/mips/kvm/trap_emul.c
+++ b/arch/mips/kvm/trap_emul.c
@@ -703,12 +703,6 @@ static void kvm_trap_emul_flush_shadow_all(struct kvm *kvm)
 	kvm_flush_remote_tlbs(kvm);
 }
 
-static void kvm_trap_emul_flush_shadow_memslot(struct kvm *kvm,
-					const struct kvm_memory_slot *slot)
-{
-	kvm_trap_emul_flush_shadow_all(kvm);
-}
-
 static u64 kvm_trap_emul_get_one_regs[] = {
 	KVM_REG_MIPS_CP0_INDEX,
 	KVM_REG_MIPS_CP0_ENTRYLO0,
@@ -1292,7 +1286,6 @@ static struct kvm_mips_callbacks kvm_trap_emul_callbacks = {
 	.vcpu_uninit = kvm_trap_emul_vcpu_uninit,
 	.vcpu_setup = kvm_trap_emul_vcpu_setup,
 	.flush_shadow_all = kvm_trap_emul_flush_shadow_all,
-	.flush_shadow_memslot = kvm_trap_emul_flush_shadow_memslot,
 	.gva_to_gpa = kvm_trap_emul_gva_to_gpa_cb,
 	.queue_timer_int = kvm_mips_queue_timer_int_cb,
 	.dequeue_timer_int = kvm_mips_dequeue_timer_int_cb,
diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index dde20887a70d..814bd1564a79 100644
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -3123,12 +3123,6 @@ static void kvm_vz_flush_shadow_all(struct kvm *kvm)
 	}
 }
 
-static void kvm_vz_flush_shadow_memslot(struct kvm *kvm,
-					const struct kvm_memory_slot *slot)
-{
-	kvm_vz_flush_shadow_all(kvm);
-}
-
 static void kvm_vz_vcpu_reenter(struct kvm_run *run, struct kvm_vcpu *vcpu)
 {
 	int cpu = smp_processor_id();
@@ -3185,7 +3179,6 @@ static struct kvm_mips_callbacks kvm_vz_callbacks = {
 	.vcpu_uninit = kvm_vz_vcpu_uninit,
 	.vcpu_setup = kvm_vz_vcpu_setup,
 	.flush_shadow_all = kvm_vz_flush_shadow_all,
-	.flush_shadow_memslot = kvm_vz_flush_shadow_memslot,
 	.gva_to_gpa = kvm_vz_gva_to_gpa_cb,
 	.queue_timer_int = kvm_vz_queue_timer_int_cb,
 	.dequeue_timer_int = kvm_vz_dequeue_timer_int_cb,
-- 
2.24.1