KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_run

Web:        https://git.kernel.org/torvalds/c/accb757d798c9b4d85cfe3e5972134c586525168
Commit:     accb757d798c9b4d85cfe3e5972134c586525168
Parent:     8a32dd60ec9488b73e04e5b7bc82b77a2580b1b7
Refname:    refs/heads/master
Author:     Christoffer Dall <[email protected]>
AuthorDate: Mon Dec 4 21:35:25 2017 +0100
Committer:  Paolo Bonzini <[email protected]>
CommitDate: Thu Dec 14 09:26:50 2017 +0100

    KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_run
    
    Move vcpu_load() and vcpu_put() into the architecture specific
    implementations of kvm_arch_vcpu_ioctl_run().
    
    Signed-off-by: Christoffer Dall <[email protected]>
    Reviewed-by: Christian Borntraeger <[email protected]> # s390 parts
    Reviewed-by: Cornelia Huck <[email protected]>
    [Rebased. - Paolo]
    Signed-off-by: Paolo Bonzini <[email protected]>
---
 arch/mips/kvm/mips.c       |  3 +++
 arch/powerpc/kvm/powerpc.c |  6 +++++-
 arch/s390/kvm/kvm-s390.c   | 10 ++++++++--
 arch/x86/kvm/x86.c         |  3 ++-
 virt/kvm/arm/arm.c         | 20 ++++++++++++++------
 virt/kvm/kvm_main.c        |  2 --
 6 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index 75fdeaa8c62f..ba5ecf22bb96 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c
@@ -446,6 +446,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
 	int r = -EINTR;
 
+	vcpu_load(vcpu);
+
 	kvm_sigset_activate(vcpu);
 
 	if (vcpu->mmio_needed) {
@@ -480,6 +482,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 out:
 	kvm_sigset_deactivate(vcpu);
 
+	vcpu_put(vcpu);
 	return r;
 }
 
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index 1915e86cef6f..4e2167a7ae19 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -1408,6 +1408,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 {
 	int r;
 
+	vcpu_load(vcpu);
+
 	if (vcpu->mmio_needed) {
 		vcpu->mmio_needed = 0;
 		if (!vcpu->mmio_is_write)
@@ -1422,7 +1424,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 			r = kvmppc_emulate_mmio_vsx_loadstore(vcpu, run);
 			if (r == RESUME_HOST) {
 				vcpu->mmio_needed = 1;
-				return r;
+				goto out;
 			}
 		}
 #endif
@@ -1456,6 +1458,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 
 	kvm_sigset_deactivate(vcpu);
 
+out:
+	vcpu_put(vcpu);
 	return r;
 }
 
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ec8b68e97d3c..7972598e60d0 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -3373,9 +3373,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	if (kvm_run->immediate_exit)
 		return -EINTR;
 
+	vcpu_load(vcpu);
+
 	if (guestdbg_exit_pending(vcpu)) {
 		kvm_s390_prepare_debug_exit(vcpu);
-		return 0;
+		rc = 0;
+		goto out;
 	}
 
 	kvm_sigset_activate(vcpu);
@@ -3385,7 +3388,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	} else if (is_vcpu_stopped(vcpu)) {
 		pr_err_ratelimited("can't run stopped vcpu %d\n",
 				   vcpu->vcpu_id);
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	sync_regs(vcpu, kvm_run);
@@ -3415,6 +3419,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	kvm_sigset_deactivate(vcpu);
 
 	vcpu->stat.exit_userspace++;
+out:
+	vcpu_put(vcpu);
 	return rc;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3f2c78f58570..af9da75011bc 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7280,8 +7280,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 {
 	int r;
 
+	vcpu_load(vcpu);
 	kvm_sigset_activate(vcpu);
-
 	kvm_load_guest_fpu(vcpu);
 
 	if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
@@ -7328,6 +7328,7 @@ out:
 	post_kvm_run_save(vcpu);
 	kvm_sigset_deactivate(vcpu);
 
+	vcpu_put(vcpu);
 	return r;
 }
 
diff --git a/virt/kvm/arm/arm.c b/virt/kvm/arm/arm.c
index 6b60c98a6e22..a1b2e8a43ca0 100644
--- a/virt/kvm/arm/arm.c
+++ b/virt/kvm/arm/arm.c
@@ -619,21 +619,27 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 	if (unlikely(!kvm_vcpu_initialized(vcpu)))
 		return -ENOEXEC;
 
+	vcpu_load(vcpu);
+
 	ret = kvm_vcpu_first_run_init(vcpu);
 	if (ret)
-		return ret;
+		goto out;
 
 	if (run->exit_reason == KVM_EXIT_MMIO) {
 		ret = kvm_handle_mmio_return(vcpu, vcpu->run);
 		if (ret)
-			return ret;
-		if (kvm_arm_handle_step_debug(vcpu, vcpu->run))
-			return 0;
+			goto out;
+		if (kvm_arm_handle_step_debug(vcpu, vcpu->run)) {
+			ret = 0;
+			goto out;
+		}
 
 	}
 
-	if (run->immediate_exit)
-		return -EINTR;
+	if (run->immediate_exit) {
+		ret = -EINTR;
+		goto out;
+	}
 
 	kvm_sigset_activate(vcpu);
 
@@ -772,6 +778,8 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
 
 	kvm_sigset_deactivate(vcpu);
 
+out:
+	vcpu_put(vcpu);
 	return ret;
 }
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7bbaad8717a2..0b149827570c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2562,7 +2562,6 @@ static long kvm_vcpu_ioctl(struct file *filp,
 		r = -EINVAL;
 		if (arg)
 			goto out;
-		vcpu_load(vcpu);
 		oldpid = rcu_access_pointer(vcpu->pid);
 		if (unlikely(oldpid != current->pids[PIDTYPE_PID].pid)) {
 			/* The thread running this VCPU changed. */
@@ -2574,7 +2573,6 @@ static long kvm_vcpu_ioctl(struct file *filp,
 			put_pid(oldpid);
 		}
 		r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
-		vcpu_put(vcpu);
 		trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
 		break;
 	}
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