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Reply-To: Sean Christopherson <seanjc@google.com>
Date:   Wed, 30 Nov 2022 23:09:02 +0000
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Subject: [PATCH v2 18/50] KVM: arm64: Unregister perf callbacks if hypervisor
 finalization fails
From:   Sean Christopherson <seanjc@google.com>
To:     Paolo Bonzini <pbonzini@redhat.com>, Marc Zyngier <maz@kernel.org>,
        Huacai Chen <chenhuacai@kernel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
        Anup Patel <anup@brainfault.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Christian Borntraeger <borntraeger@linux.ibm.com>,
        Janosch Frank <frankja@linux.ibm.com>,
        Claudio Imbrenda <imbrenda@linux.ibm.com>,
        Matthew Rosato <mjrosato@linux.ibm.com>,
        Eric Farman <farman@linux.ibm.com>,
        Sean Christopherson <seanjc@google.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Paul Durrant <paul@xen.org>
Cc:     James Morse <james.morse@arm.com>,
        Alexandru Elisei <alexandru.elisei@arm.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Oliver Upton <oliver.upton@linux.dev>,
        Atish Patra <atishp@atishpatra.org>,
        David Hildenbrand <david@redhat.com>, kvm@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
        kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, kvm-riscv@lists.infradead.org,
        linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
        linux-kernel@vger.kernel.org, Yuan Yao <yuan.yao@intel.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Isaku Yamahata <isaku.yamahata@intel.com>,
        "=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?=" <philmd@linaro.org>,
        Fabiano Rosas <farosas@linux.ibm.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Kai Huang <kai.huang@intel.com>, Chao Gao <chao.gao@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Undo everything done by init_subsystems() if a later initialization step
fails, i.e. unregister perf callbacks in addition to unregistering the
power management notifier.

Fixes: bfa79a805454 ("KVM: arm64: Elevate hypervisor mappings creation at EL2")
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/arm64/kvm/arm.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index fa986ebb4793..e6f6fcfe6bcc 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1839,12 +1839,21 @@ static int init_subsystems(void)
 	kvm_register_perf_callbacks(NULL);
 
 out:
+	if (err)
+		hyp_cpu_pm_exit();
+
 	if (err || !is_protected_kvm_enabled())
 		on_each_cpu(_kvm_arch_hardware_disable, NULL, 1);
 
 	return err;
 }
 
+static void teardown_subsystems(void)
+{
+	kvm_unregister_perf_callbacks();
+	hyp_cpu_pm_exit();
+}
+
 static void teardown_hyp_mode(void)
 {
 	int cpu;
@@ -2242,7 +2251,7 @@ int kvm_arch_init(void *opaque)
 
 	err = init_subsystems();
 	if (err)
-		goto out_subs;
+		goto out_hyp;
 
 	if (!in_hyp_mode) {
 		err = finalize_hyp_mode();
@@ -2263,7 +2272,7 @@ int kvm_arch_init(void *opaque)
 	return 0;
 
 out_subs:
-	hyp_cpu_pm_exit();
+	teardown_subsystems();
 out_hyp:
 	if (!in_hyp_mode)
 		teardown_hyp_mode();
-- 
2.38.1.584.g0f3c55d4c2-goog