From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang, Kai Date: Thu, 10 Nov 2022 02:11:47 +0000 Subject: [PATCH 38/44] KVM: Disable CPU hotplug during hardware enabling In-Reply-To: <88e920944de70e7d69a98f74005b49c59b5aaa3b.camel@intel.com> References: <20221102231911.3107438-1-seanjc@google.com> <20221102231911.3107438-39-seanjc@google.com> <88e920944de70e7d69a98f74005b49c59b5aaa3b.camel@intel.com> Message-ID: List-Id: To: kvm-riscv@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Thu, 2022-11-10 at 01:33 +0000, Huang, Kai wrote: > > @@ -9283,7 +9283,13 @@ static int > > kvm_x86_check_processor_compatibility(struct kvm_x86_init_ops *ops) > > ? int cpu = smp_processor_id(); > > ? struct cpuinfo_x86 *c = &cpu_data(cpu); > > ? > > - WARN_ON(!irqs_disabled()); > > + /* > > + * Compatibility checks are done when loading KVM and when enabling > > + * hardware, e.g. during CPU hotplug, to ensure all online CPUs are > > + * compatible, i.e. KVM should never perform a compatibility check > > on > > + * an offline CPU. > > + */ > > + WARN_ON(!irqs_disabled() && cpu_active(cpu)); > > ? > > Also, the logic of: > > !irqs_disabled() && cpu_active(cpu) > > is quite weird. > > The original "WARN(!irqs_disabled())" is reasonable because in STARTING > section > the IRQ is indeed disabled. > > But this doesn't make sense anymore after we move to ONLINE section, in which > IRQ has already been enabled (see start_secondary()).? IIUC the WARN_ON() > doesn't get exploded is purely because there's an additional cpu_active(cpu) > check. > > So, a more reasonable check should be something like: > > WARN_ON(irqs_disabled() || cpu_active(cpu) || !cpu_online(cpu)); > > Or we can simply do: > > WARN_ON(!cpu_online(cpu) || cpu_active(cpu)); > > (because I don't know whether it's possible IRQ can somehow get disabled in > ONLINE section). > > Btw above is purely based on code analysis, but I haven't done any test. Hmm.. I wasn't thinking thoroughly. I forgot CPU compatibility check also happens on all online cpus when loading KVM. For this case, IRQ is disabled and cpu_active() is true. For the hotplug case, IRQ is enabled but cpu_active() is false. So WARN_ON(!irqs_disabled() && cpu_active(cpu)) looks reasonable. Sorry for the noise. Just needed some time to connect the comment with the code. 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