linux-kernel - [PATCH 5/9] KVM: arm: move has_run_once after the map

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Date:   Sat, 12 Dec 2020 19:50:06 +0100
From:   Eric Auger <eric.auger@...hat.com>
To:     eric.auger.pro@...il.com, eric.auger@...hat.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        kvmarm@...ts.cs.columbia.edu, maz@...nel.org, drjones@...hat.com
Cc:     alexandru.elisei@....com, james.morse@....com,
        julien.thierry.kdev@...il.com, suzuki.poulose@....com,
        shuah@...nel.org, pbonzini@...hat.com
Subject: [PATCH 5/9] KVM: arm: move has_run_once after the map_resources

has_run_once is set to true at the beginning of
kvm_vcpu_first_run_init(). This generally is not an issue
except when exercising the code with KVM selftests. Indeed,
if kvm_vgic_map_resources() fails due to erroneous user settings,
has_run_once is set and this prevents from continuing
executing the test. This patch moves the assignment after the
kvm_vgic_map_resources().

Signed-off-by: Eric Auger <eric.auger@...hat.com>
---
 arch/arm64/kvm/arm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index c0ffb019ca8b..331fae6bff31 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -540,8 +540,6 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 	if (!kvm_arm_vcpu_is_finalized(vcpu))
 		return -EPERM;
 
-	vcpu->arch.has_run_once = true;
-
 	if (likely(irqchip_in_kernel(kvm))) {
 		/*
 		 * Map the VGIC hardware resources before running a vcpu the
@@ -560,6 +558,8 @@ static int kvm_vcpu_first_run_init(struct kvm_vcpu *vcpu)
 		static_branch_inc(&userspace_irqchip_in_use);
 	}
 
+	vcpu->arch.has_run_once = true;
+
 	ret = kvm_timer_enable(vcpu);
 	if (ret)
 		return ret;
-- 
2.21.3