From mboxrd@z Thu Jan 1 00:00:00 1970 From: Huang, Kai Date: Tue, 8 Nov 2022 10:35:02 +0000 Subject: [PATCH 00/44] KVM: Rework kvm_init() and hardware enabling In-Reply-To: <9890f67846f1c2c6a12bd086fc822f0762966223.camel@intel.com> References: <20221102231911.3107438-1-seanjc@google.com> <20221104071749.GC1063309@ls.amr.corp.intel.com> <20221107214634.GE1063309@ls.amr.corp.intel.com> <20221108054354.GA1708572@ls.amr.corp.intel.com> <9890f67846f1c2c6a12bd086fc822f0762966223.camel@intel.com> Message-ID: <4ea4f8422b22486717239b39a0c206e7a91d49a8.camel@intel.com> List-Id: To: kvm-riscv@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Tue, 2022-11-08 at 08:56 +0000, Huang, Kai wrote: > On Mon, 2022-11-07 at 21:43 -0800, Isaku Yamahata wrote: > > On Tue, Nov 08, 2022 at 01:09:27AM +0000, > > "Huang, Kai" wrote: > > > > > On Mon, 2022-11-07 at 13:46 -0800, Isaku Yamahata wrote: > > > > > On Fri, Nov 04, 2022, Isaku Yamahata wrote: > > > > > > Thanks for the patch series. I the rebased TDX KVM patch series and it > > > > > > worked. > > > > > > Since cpu offline needs to be rejected in some cases(To keep at least one > > > > > > cpu > > > > > > on a package), arch hook for cpu offline is needed. > > > > > > > > > > I hate to bring this up because I doubt there's a real use case for SUSPEND > > > > > with > > > > > TDX, but the CPU offline path isn't just for true offlining of CPUs.? When > > > > > the > > > > > system enters SUSPEND, only the initiating CPU goes through > > > > > kvm_suspend()+kvm_resume(), > > > > > all responding CPUs go through CPU offline+online.? I.e. disallowing all > > > > > CPUs from > > > > > going "offline" will prevent suspending the system. > > > > > > > > The current TDX KVM implementation disallows CPU package from offline only > > > > when > > > > TDs are running.? If no TD is running, CPU offline is allowed.? So before > > > > SUSPEND, TDs need to be killed via systemd or something.? After killing TDs, > > > > the > > > > system can enter into SUSPEND state. > > > > > > This seems not correct. You need one cpu for each to be online in order to > > > create TD as well, as TDH.MNG.KEY.CONFIG needs to be called on all packages, > > > correct? > > > > That's correct. In such case, the creation of TD fails. TD creation checks if > > at least one cpu is online on all CPU packages. If no, error. > > I think we can just always refuse to offline the last cpu for each package when > TDX is enabled. It's simpler I guess. Sorry I wasn't reading carefully. Please ignore. 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([fe80::6eb:99bf:5c45:a94b%3]) with mapi id 15.20.5791.026; Tue, 8 Nov 2022 10:35:03 +0000 From: "Huang, Kai" To: "isaku.yamahata@gmail.com" CC: "borntraeger@linux.ibm.com" , "Yao, Yuan" , "tglx@linutronix.de" , "kvm-riscv@lists.infradead.org" , "kvm@vger.kernel.org" , "Yamahata, Isaku" , "suzuki.poulose@arm.com" , "pbonzini@redhat.com" , "david@redhat.com" , "linux-mips@vger.kernel.org" , "linux-riscv@lists.infradead.org" , "linuxppc-dev@lists.ozlabs.org" , "kvmarm@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "mjrosato@linux.ibm.com" , "oliver.upton@linux.dev" , "farosas@linux.ibm.com" , "linux-s390@vger.kernel.org" , "palmer@dabbelt.com" , "chenhuacai@kernel.org" , "mpe@ellerman.id.au" , "aou@eecs.berkeley.edu" , "alexandru.elisei@arm.com" , "Christopherson,, Sean" , "vkuznets@redhat.com" , "maz@kernel.org" , "anup@brainfault.org" , "frankja@linux.ibm.com" , "farman@linux.ibm.com" , "james.morse@arm.com" , "kvmarm@lists.cs.columbia.edu" , "aleksandar.qemu.devel@gmail.com" , 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