From: isaku.yamahata@intel.com
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Thomas Gleixner <tglx@linutronix.de>,
Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>
Cc: isaku.yamahata@intel.com, isaku.yamahata@gmail.com,
Kai Huang <kai.huang@intel.com>, Chao Gao <chao.gao@intel.com>,
Atish Patra <atishp@atishpatra.org>,
Shaokun Zhang <zhangshaokun@hisilicon.com>,
Qi Liu <liuqi115@huawei.com>, John Garry <john.garry@huawei.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Huang Ying <ying.huang@intel.com>,
Huacai Chen <chenhuacai@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Borislav Petkov <bp@alien8.de>
Subject: [PATCH v3 17/22] KVM: x86: Duplicate arch callbacks related to pm events
Date: Thu, 1 Sep 2022 19:17:52 -0700 [thread overview]
Message-ID: <903be9503d38e1bfbc4023ef24753f4eba76bc87.1662084396.git.isaku.yamahata@intel.com> (raw)
In-Reply-To: <cover.1662084396.git.isaku.yamahata@intel.com>
From: Isaku Yamahata <isaku.yamahata@intel.com>
KVM/X86 can change those callbacks without worrying about breaking other
archs.
Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/x86.c | 131 +++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 126 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f5f4d8eed588..9a28eb5fbb76 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -11845,6 +11845,130 @@ void kvm_arch_hardware_disable(void)
drop_user_return_notifiers();
}
+static cpumask_t cpus_hardware_enabled = CPU_MASK_NONE;
+
+int kvm_arch_post_init_vm(struct kvm *kvm)
+{
+ return kvm_mmu_post_init_vm(kvm);
+}
+
+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);
+ return r;
+}
+
+static void hardware_enable(void *arg)
+{
+ atomic_t *failed = arg;
+
+ if (__hardware_enable((void *)__func__))
+ atomic_inc(failed);
+}
+
+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();
+}
+
+void kvm_arch_pre_hardware_unsetup(void)
+{
+ on_each_cpu(hardware_disable, NULL, 1);
+}
+
+/*
+ * Called after the VM is otherwise initialized, but just before adding it to
+ * the vm_list.
+ */
+int kvm_arch_add_vm(struct kvm *kvm, int usage_count)
+{
+ atomic_t failed;
+ int r = 0;
+
+ if (usage_count != 1)
+ return 0;
+
+ atomic_set(&failed, 0);
+ on_each_cpu(hardware_enable, &failed, 1);
+
+ if (atomic_read(&failed)) {
+ r = -EBUSY;
+ goto err;
+ }
+
+ r = kvm_arch_post_init_vm(kvm);
+err:
+ if (r)
+ on_each_cpu(hardware_disable, NULL, 1);
+ return r;
+}
+
+int kvm_arch_del_vm(int usage_count)
+{
+ if (usage_count)
+ return 0;
+
+ on_each_cpu(hardware_disable, NULL, 1);
+ return 0;
+}
+
+int kvm_arch_online_cpu(unsigned int cpu, int usage_count)
+{
+ int r;
+
+ r = kvm_arch_check_processor_compat();
+ if (r)
+ return r;
+
+ if (!usage_count)
+ return 0;
+ /*
+ * Abort the CPU online process if hardware virtualization cannot
+ * be enabled. Otherwise running VMs would encounter unrecoverable
+ * errors when scheduled to this CPU.
+ */
+ return __hardware_enable((void *)__func__);
+}
+
+int kvm_arch_offline_cpu(unsigned int cpu, int usage_count)
+{
+ if (usage_count)
+ hardware_disable(NULL);
+ return 0;
+}
+
+int kvm_arch_reboot(int val)
+{
+ on_each_cpu(hardware_disable, NULL, 1);
+ return NOTIFY_OK;
+}
+
+int kvm_arch_suspend(int usage_count)
+{
+ if (usage_count)
+ hardware_disable(NULL);
+ return 0;
+}
+
void kvm_arch_resume(int usage_count)
{
struct kvm *kvm;
@@ -11857,6 +11981,8 @@ void kvm_arch_resume(int usage_count)
if (!usage_count)
return;
+ if (kvm_arch_check_processor_compat())
+ return;
if (kvm_arch_hardware_enable())
return;
@@ -12115,11 +12241,6 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
return ret;
}
-int kvm_arch_post_init_vm(struct kvm *kvm)
-{
- return kvm_mmu_post_init_vm(kvm);
-}
-
static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
{
vcpu_load(vcpu);
--
2.25.1
next prev parent reply other threads:[~2022-09-02 2:19 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-02 2:17 [PATCH v3 00/22] KVM: hardware enable/disable reorganize isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 01/22] KVM: x86: Drop kvm_user_return_msr_cpu_online() isaku.yamahata
2022-09-05 1:59 ` Chao Gao
2022-09-05 5:30 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 02/22] KVM: x86: Use this_cpu_ptr() instead of per_cpu_ptr(smp_processor_id()) isaku.yamahata
2022-09-05 5:35 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 03/22] KVM: x86: Move check_processor_compatibility from init ops to runtime ops isaku.yamahata
2022-09-05 5:42 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 04/22] Partially revert "KVM: Pass kvm_init()'s opaque param to additional arch funcs" isaku.yamahata
2022-09-05 5:48 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 05/22] KVM: Provide more information in kernel log if hardware enabling fails isaku.yamahata
2022-09-05 5:56 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 06/22] KVM: arm64: Simplify the CPUHP logic isaku.yamahata
2022-09-05 7:05 ` Yuan Yao
2022-09-05 9:29 ` Marc Zyngier
2022-09-05 12:39 ` Marc Zyngier
2022-09-07 15:12 ` Isaku Yamahata
2022-09-02 2:17 ` [PATCH v3 07/22] KVM: Rename and move CPUHP_AP_KVM_STARTING to ONLINE section isaku.yamahata
2022-09-05 7:49 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 08/22] KVM: Do compatibility checks on hotplugged CPUs isaku.yamahata
2022-09-06 1:25 ` Yuan Yao
2022-09-02 2:17 ` [PATCH v3 09/22] KVM: Do processor compatibility check on resume isaku.yamahata
2022-09-05 8:40 ` Yuan Yao
2022-09-05 9:27 ` Yuan Yao
2022-09-08 18:21 ` Isaku Yamahata
2022-09-02 2:17 ` [PATCH v3 10/22] KVM: Drop kvm_count_lock and instead protect kvm_usage_count with kvm_lock isaku.yamahata
2022-09-06 2:46 ` Yuan Yao
2022-09-06 6:32 ` Marc Zyngier
2022-09-06 21:44 ` Isaku Yamahata
2022-09-08 18:24 ` Isaku Yamahata
2022-09-02 2:17 ` [PATCH v3 11/22] KVM: Add arch hooks for PM events with empty stub isaku.yamahata
2022-09-06 6:25 ` Yuan Yao
2022-09-08 19:11 ` Isaku Yamahata
2022-09-02 2:17 ` [PATCH v3 12/22] KVM: x86: Move TSC fixup logic to KVM arch resume callback isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 13/22] KVM: Add arch hook when VM is added/deleted isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 14/22] KVM: Move out KVM arch PM hooks and hardware enable/disable logic isaku.yamahata
2022-09-06 7:43 ` Yuan Yao
2022-09-08 19:15 ` Isaku Yamahata
2022-09-02 2:17 ` [PATCH v3 15/22] KVM: kvm_arch.c: Remove _nolock post fix isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 16/22] KVM: kvm_arch.c: Remove a global variable, hardware_enable_failed isaku.yamahata
2022-09-07 5:56 ` Yuan Yao
2022-09-08 22:51 ` Isaku Yamahata
2022-09-02 2:17 ` isaku.yamahata [this message]
2022-09-02 2:17 ` [PATCH v3 18/22] KVM: Eliminate kvm_arch_post_init_vm() isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 19/22] KVM: x86: Delete kvm_arch_hardware_enable/disable() isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 20/22] KVM: Add config to not compile kvm_arch.c isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 21/22] RFC: KVM: x86: Remove cpus_hardware_enabled and related sanity check isaku.yamahata
2022-09-02 2:17 ` [PATCH v3 22/22] RFC: KVM: " isaku.yamahata
2022-09-05 15:38 ` [PATCH v3 00/22] KVM: hardware enable/disable reorganize Marc Zyngier
2022-09-06 22:25 ` Isaku Yamahata
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=903be9503d38e1bfbc4023ef24753f4eba76bc87.1662084396.git.isaku.yamahata@intel.com \
--to=isaku.yamahata@intel.com \
--cc=atishp@atishpatra.org \
--cc=bp@alien8.de \
--cc=chao.gao@intel.com \
--cc=chenhuacai@kernel.org \
--cc=daniel.lezcano@linaro.org \
--cc=dave.hansen@linux.intel.com \
--cc=isaku.yamahata@gmail.com \
--cc=john.garry@huawei.com \
--cc=kai.huang@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=liuqi115@huawei.com \
--cc=maz@kernel.org \
--cc=pbonzini@redhat.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=will@kernel.org \
--cc=ying.huang@intel.com \
--cc=zhangshaokun@hisilicon.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).