linux-kernel - [PATCH v4 26/26] RFC: KVM: Remove cpus_hardware

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Message-Id: <76ddec4c5fa3d84d422d3b90739c6a09d13d4bbc.1662679124.git.isaku.yamahata@intel.com>
Date:   Thu,  8 Sep 2022 16:25:42 -0700
From:   isaku.yamahata@...el.com
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
        Yuan Yao <yuan.yao@...ux.intel.com>
Cc:     isaku.yamahata@...el.com, isaku.yamahata@...il.com,
        Kai Huang <kai.huang@...el.com>, Chao Gao <chao.gao@...el.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shaokun Zhang <zhangshaokun@...ilicon.com>,
        Qi Liu <liuqi115@...wei.com>,
        John Garry <john.garry@...wei.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Huang Ying <ying.huang@...el.com>,
        Huacai Chen <chenhuacai@...nel.org>
Subject: [PATCH v4 26/26] RFC: KVM: Remove cpus_hardware_enabled and related sanity check

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

cpus_hardware_enabled mask seems incomplete protection against other kernel
component using CPU virtualization feature.  Because it's obscure and
incomplete, remove the check.

Suggested-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 virt/kvm/kvm_arch.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/virt/kvm/kvm_arch.c b/virt/kvm/kvm_arch.c
index 68fb679d71f2..383b0065ecb0 100644
--- a/virt/kvm/kvm_arch.c
+++ b/virt/kvm/kvm_arch.c
@@ -12,23 +12,16 @@
 
 #include <linux/kvm_host.h>
 
-static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
-
 static int __hardware_enable(void *caller_name)
 {
-	int cpu = raw_smp_processor_id();
 	int r;
 
 	WARN_ON_ONCE(preemptible());
 
-	if (cpumask_test_cpu(cpu, &cpus_hardware_enabled))
-		return 0;
 	r = kvm_arch_hardware_enable();
 	if (r)
 		pr_warn("kvm: enabling virtualization on CPU%d failed during %s()\n",
-			cpu, (const char *)caller_name);
-	else
-		cpumask_set_cpu(cpu, &cpus_hardware_enabled);
+			smp_processor_id(), (const char *)caller_name);
 	return r;
 }
 
@@ -42,13 +35,7 @@ static void hardware_enable(void *arg)
 
 static void hardware_disable(void *junk)
 {
-	int cpu = raw_smp_processor_id();
-
 	WARN_ON_ONCE(preemptible());
-
-	if (!cpumask_test_cpu(cpu, &cpus_hardware_enabled))
-		return;
-	cpumask_clear_cpu(cpu, &cpus_hardware_enabled);
 	kvm_arch_hardware_disable();
 }
 
-- 
2.25.1