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Reply-To: Sean Christopherson <seanjc@google.com>
Date:   Fri,  8 Oct 2021 19:12:18 -0700
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Subject: [PATCH v2 25/43] KVM: VMX: Save/restore IRQs (instead of CLI/STI)
 during PI pre/post block
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>,
        Anup Patel <anup.patel@wdc.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Janosch Frank <frankja@linux.ibm.com>,
        Paolo Bonzini <pbonzini@redhat.com>
Cc:     James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Atish Patra <atish.patra@wdc.com>,
        David Hildenbrand <david@redhat.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Claudio Imbrenda <imbrenda@linux.ibm.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, kvm-riscv@lists.infradead.org,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        David Matlack <dmatlack@google.com>,
        Oliver Upton <oupton@google.com>,
        Jing Zhang <jingzhangos@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Save/restore IRQs when disabling IRQs in posted interrupt pre/post block
in preparation for moving the code into vcpu_put/load(), and thus may be
called with IRQs already disabled.

No functional changed intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/vmx/posted_intr.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/vmx/posted_intr.c b/arch/x86/kvm/vmx/posted_intr.c
index 239e0e72a0dd..414ea6972b5c 100644
--- a/arch/x86/kvm/vmx/posted_intr.c
+++ b/arch/x86/kvm/vmx/posted_intr.c
@@ -140,6 +140,7 @@ int pi_pre_block(struct kvm_vcpu *vcpu)
 {
 	struct pi_desc old, new;
 	struct pi_desc *pi_desc = vcpu_to_pi_desc(vcpu);
+	unsigned long flags;
 
 	if (!kvm_arch_has_assigned_device(vcpu->kvm) ||
 	    !irq_remapping_cap(IRQ_POSTING_CAP) ||
@@ -147,8 +148,7 @@ int pi_pre_block(struct kvm_vcpu *vcpu)
 	    vmx_interrupt_blocked(vcpu))
 		return 0;
 
-	WARN_ON(irqs_disabled());
-	local_irq_disable();
+	local_irq_save(flags);
 
 	vcpu->pre_pcpu = vcpu->cpu;
 	spin_lock(&per_cpu(blocked_vcpu_on_cpu_lock, vcpu->cpu));
@@ -171,19 +171,20 @@ int pi_pre_block(struct kvm_vcpu *vcpu)
 	if (pi_test_on(pi_desc))
 		__pi_post_block(vcpu);
 
-	local_irq_enable();
+	local_irq_restore(flags);
 	return (vcpu->pre_pcpu == -1);
 }
 
 void pi_post_block(struct kvm_vcpu *vcpu)
 {
+	unsigned long flags;
+
 	if (vcpu->pre_pcpu == -1)
 		return;
 
-	WARN_ON(irqs_disabled());
-	local_irq_disable();
+	local_irq_save(flags);
 	__pi_post_block(vcpu);
-	local_irq_enable();
+	local_irq_restore(flags);
 }
 
 /*
-- 
2.33.0.882.g93a45727a2-goog