linux-kernel - [PATCH v16 002/116] KVM: x86/vmx: initialize loaded_vmcss_on_cpu in vmx_hardware

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Message-Id: <33f23ae088026a9375e67fdbc5733a3f446ea9db.1697471314.git.isaku.yamahata@intel.com>
Date:   Mon, 16 Oct 2023 09:13:14 -0700
From:   isaku.yamahata@...el.com
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Paolo Bonzini <pbonzini@...hat.com>, erdemaktas@...gle.com,
        Sean Christopherson <seanjc@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com
Subject: [PATCH v16 002/116] KVM: x86/vmx: initialize loaded_vmcss_on_cpu in vmx_hardware_setup()

From: Isaku Yamahata <isaku.yamahata@...el.com>

vmx_hardware_disable() accesses loaded_vmcss_on_cpu via
hardware_disable_all().  To allow hardware_enable/disable_all() before
kvm_init(), initialize it in vmx_hardware_setup() so that tdx module
initialization, hardware_setup method, can reference the variable.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/vmx.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f733629c4706..3627b704ff37 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -8266,8 +8266,12 @@ __init int vmx_hardware_setup(void)
 {
 	unsigned long host_bndcfgs;
 	struct desc_ptr dt;
+	int cpu;
 	int r;
 
+	/* vmx_hardware_disable() accesses loaded_vmcss_on_cpu. */
+	for_each_possible_cpu(cpu)
+		INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
 	store_idt(&dt);
 	host_idt_base = dt.address;
 
@@ -8510,11 +8514,8 @@ static int __init vmx_init(void)
 	if (r)
 		goto err_l1d_flush;
 
-	for_each_possible_cpu(cpu) {
-		INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
-
+	for_each_possible_cpu(cpu)
 		pi_init_cpu(cpu);
-	}
 
 	cpu_emergency_register_virt_callback(vmx_emergency_disable);
 
-- 
2.25.1