From: Zhi Wang <zhi.wang.linux@gmail.com>
To: Isaku Yamahata <isaku.yamahata@gmail.com>
Cc: isaku.yamahata@intel.com, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
erdemaktas@google.com, Sean Christopherson <seanjc@google.com>,
Sagi Shahar <sagis@google.com>,
David Matlack <dmatlack@google.com>,
Kai Huang <kai.huang@intel.com>
Subject: Re: [PATCH v13 018/113] KVM: x86, tdx: Make KVM_CAP_MAX_VCPUS backend specific
Date: Sat, 1 Apr 2023 10:00:40 +0300 [thread overview]
Message-ID: <20230401100040.0000515c@gmail.com> (raw)
In-Reply-To: <20230329233258.GC1108448@ls.amr.corp.intel.com>
On Wed, 29 Mar 2023 16:32:58 -0700
Isaku Yamahata <isaku.yamahata@gmail.com> wrote:
> On Sat, Mar 25, 2023 at 08:13:26PM +0200,
> Zhi Wang <zhi.wang.linux@gmail.com> wrote:
>
> > On Sun, 12 Mar 2023 10:55:42 -0700
> > isaku.yamahata@intel.com wrote:
> >
> > > From: Isaku Yamahata <isaku.yamahata@intel.com>
> > >
> > > TDX has its own limitation on the maximum number of vcpus that the guest
> > > can accommodate. Allow x86 kvm backend to implement its own KVM_ENABLE_CAP
> > > handler and implement TDX backend for KVM_CAP_MAX_VCPUS. user space VMM,
> > > e.g. qemu, can specify its value instead of KVM_MAX_VCPUS.
> > >
> >
> > I think enabling the cap here is actually "configuring the cap". KVM_CAP_MAX
> > _VCPUS is actually always enabled whether userspace enables it or not. It
> > would be nice to configure of the max VCPUS in kvm_arch_vm_ioctl() where
> > routines of configuring a VM should belong. E.g. KVM_SET_MAX_VCPUS.
>
> I'm not sure I understand your point. Although KVM_ENABLE_CAP sounds like
> only on/off feature, but it isn't. It's also used to set parameters. For
> example, KVM_CAP_MAX_VCPU_ID.
>
Yes, I understand your point. But what has been there might not be right as
well. That doesn't smell right as "enable" is for something which is previously
"disabled". I understand that there can be some caps require configuration
when being enabled. But later, for those caps which don't have "on/off"
state, KVM_ENABLE_CAP doesn't actually enable a feature, it is just
configuring a feature. It seems like the KVM_ENABLE_CAP has been mis-used
little by little in the history. Also, I don't find KVM_DISABLE_CAP
accordingly. So KVM_ENABLE_CAP is actually used as "KVM_SET_CAP".
I realize it is not realistic to solve the problem in this patch series.
You can keep the current approach.
> KVM_SET_XXX is for run time feature. But the maxium number of vcpus is not
> runtime changable. Set it at vm creation.
next prev parent reply other threads:[~2023-04-01 7:00 UTC|newest]
Thread overview: 193+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-12 17:55 [PATCH v13 000/113] KVM TDX basic feature support isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 001/113] KVM: VMX: Move out vmx_x86_ops to 'main.c' to wrap VMX and TDX isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 002/113] KVM: x86/vmx: Refactor KVM VMX module init/exit functions isaku.yamahata
2023-03-13 14:49 ` Wang, Wei W
2023-03-13 18:40 ` Isaku Yamahata
2023-03-14 1:57 ` Wang, Wei W
2023-05-23 2:23 ` Wen, Qian
2023-05-28 6:10 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 003/113] KVM: TDX: Initialize the TDX module when loading the KVM intel kernel module isaku.yamahata
2023-03-14 2:38 ` Huang, Kai
2023-03-15 7:27 ` Isaku Yamahata
2023-03-15 9:46 ` Huang, Kai
2023-03-15 10:35 ` Huang, Kai
2023-03-16 0:27 ` Isaku Yamahata
2023-03-24 10:41 ` Huang, Kai
2023-03-28 23:58 ` Isaku Yamahata
2023-03-29 1:13 ` Huang, Kai
2023-03-29 21:56 ` Isaku Yamahata
2023-03-29 23:17 ` Huang, Kai
2023-03-30 1:04 ` Isaku Yamahata
2023-04-05 20:07 ` Isaku Yamahata
2023-04-05 23:10 ` Huang, Kai
2023-03-12 17:55 ` [PATCH v13 004/113] KVM: TDX: Initialize logical processor when onlined isaku.yamahata
2023-03-15 9:57 ` Huang, Kai
2023-03-12 17:55 ` [PATCH v13 005/113] KVM: TDX: Add placeholders for TDX VM/vcpu structure isaku.yamahata
2023-03-15 10:42 ` Huang, Kai
2023-03-16 15:41 ` Isaku Yamahata
2023-03-16 21:42 ` Huang, Kai
2023-03-12 17:55 ` [PATCH v13 006/113] KVM: x86: Introduce vm_type to differentiate default VMs from confidential VMs isaku.yamahata
2023-03-15 10:44 ` Huang, Kai
2023-03-16 15:34 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 007/113] KVM: TDX: Make TDX VM type supported isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 008/113] [MARKER] The start of TDX KVM patch series: TDX architectural definitions isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 009/113] KVM: TDX: Define " isaku.yamahata
2023-03-13 11:37 ` Xiaoyao Li
2023-03-13 19:16 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 010/113] KVM: TDX: Add TDX "architectural" error codes isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 011/113] KVM: TDX: Add C wrapper functions for SEAMCALLs to the TDX module isaku.yamahata
2023-03-24 15:19 ` Zhi Wang
2023-03-12 17:55 ` [PATCH v13 012/113] KVM: TDX: Add helper functions to print TDX SEAMCALL error isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 013/113] [MARKER] The start of TDX KVM patch series: TD VM creation/destruction isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 014/113] x86/cpu: Add helper functions to allocate/free TDX private host key id isaku.yamahata
2023-03-24 16:35 ` Zhi Wang
2023-03-12 17:55 ` [PATCH v13 015/113] x86/virt/tdx: Add a helper function to return system wide info about TDX module isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 016/113] KVM: TDX: x86: Add ioctl to get TDX systemwide parameters isaku.yamahata
2023-03-25 8:43 ` Zhi Wang
2023-03-29 23:17 ` Isaku Yamahata
2023-03-31 0:18 ` Isaku Yamahata
2023-03-31 12:44 ` Zhi Wang
2023-04-03 3:46 ` Xiaoyao Li
2023-04-03 14:28 ` Zhi Wang
2023-04-05 18:07 ` Isaku Yamahata
2023-04-06 16:25 ` Zhi Wang
2024-01-31 6:25 ` Dan Williams
2023-03-31 6:59 ` Xiaoyao Li
2023-03-31 12:31 ` Zhi Wang
2023-03-12 17:55 ` [PATCH v13 017/113] KVM: TDX: Add place holder for TDX VM specific mem_enc_op ioctl isaku.yamahata
2023-03-25 9:05 ` Zhi Wang
2023-03-29 23:22 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 018/113] KVM: x86, tdx: Make KVM_CAP_MAX_VCPUS backend specific isaku.yamahata
2023-03-25 18:13 ` Zhi Wang
2023-03-29 23:32 ` Isaku Yamahata
2023-04-01 7:00 ` Zhi Wang [this message]
2023-03-12 17:55 ` [PATCH v13 019/113] KVM: TDX: create/destroy VM structure isaku.yamahata
2023-03-24 2:27 ` Wang, Lei
2023-03-24 5:12 ` Wang, Wei W
2023-03-26 11:09 ` Zhi Wang
2023-03-30 1:01 ` Isaku Yamahata
2023-04-02 8:41 ` Zhi Wang
2023-04-05 18:16 ` Isaku Yamahata
2023-04-06 16:04 ` Zhi Wang
2023-05-23 8:17 ` Wen, Qian
2023-05-28 8:17 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 020/113] KVM: TDX: initialize VM with TDX specific parameters isaku.yamahata
2023-04-04 19:23 ` Zhi Wang
2023-04-05 18:50 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 021/113] KVM: TDX: Make pmu_intel.c ignore guest TD case isaku.yamahata
2023-04-02 8:50 ` Zhi Wang
2023-04-19 8:21 ` Like Xu
2023-05-28 8:26 ` Isaku Yamahata
2023-05-29 14:19 ` Like Xu
2023-05-30 23:00 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 022/113] KVM: TDX: Refuse to unplug the last cpu on the package isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 023/113] [MARKER] The start of TDX KVM patch series: TD vcpu creation/destruction isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 024/113] KVM: TDX: allocate/free TDX vcpu structure isaku.yamahata
2023-04-04 19:44 ` Zhi Wang
2023-04-05 19:06 ` Isaku Yamahata
2023-03-12 17:55 ` [PATCH v13 025/113] KVM: TDX: Do TDX specific vcpu initialization isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 026/113] [MARKER] The start of TDX KVM patch series: KVM MMU GPA shared bits isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 027/113] KVM: x86/mmu: introduce config for PRIVATE KVM MMU isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 028/113] KVM: x86/mmu: Add address conversion functions for TDX shared bit of GPA isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 029/113] [MARKER] The start of TDX KVM patch series: KVM TDP refactoring for TDX isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 030/113] KVM: Allow page-sized MMU caches to be initialized with custom 64-bit values isaku.yamahata
2023-04-05 7:11 ` Zhi Wang
2023-03-12 17:55 ` [PATCH v13 031/113] KVM: x86/mmu: Replace hardcoded value 0 for the initial value for SPTE isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 032/113] KVM: x86/mmu: Allow non-zero value for non-present SPTE and removed SPTE isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 033/113] KVM: x86/mmu: Add Suppress VE bit to shadow_mmio_mask/shadow_present_mask isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 034/113] KVM: x86/mmu: Track shadow MMIO value on a per-VM basis isaku.yamahata
2023-03-12 17:55 ` [PATCH v13 035/113] KVM: x86/mmu: Disallow fast page fault on private GPA isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 036/113] KVM: x86/mmu: Allow per-VM override of the TDP max page level isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 037/113] KVM: VMX: Introduce test mode related to EPT violation VE isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 038/113] [MARKER] The start of TDX KVM patch series: KVM TDP MMU hooks isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 039/113] KVM: x86/mmu: Assume guest MMIOs are shared isaku.yamahata
2023-03-28 2:39 ` Xu Yilun
2023-03-29 23:56 ` Isaku Yamahata
2023-03-12 17:56 ` [PATCH v13 040/113] KVM: x86/tdp_mmu: Init role member of struct kvm_mmu_page at allocation isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 041/113] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page_role isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 042/113] KVM: x86/mmu: Add a private pointer to struct kvm_mmu_page isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 043/113] KVM: Add flags to struct kvm_gfn_range isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 044/113] KVM: x86/tdp_mmu: Don't zap private pages for unsupported cases isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 045/113] KVM: x86/tdp_mmu: Sprinkle __must_check isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 046/113] KVM: x86/tdp_mmu: Support TDX private mapping for TDP MMU isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 047/113] [MARKER] The start of TDX KVM patch series: TDX EPT violation isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 048/113] KVM: x86/mmu: Disallow dirty logging for x86 TDX isaku.yamahata
2023-04-22 8:18 ` Zhi Wang
2023-04-24 15:51 ` Sean Christopherson
2023-03-12 17:56 ` [PATCH v13 049/113] KVM: x86/mmu: TDX: Do not enable page track for TD guest isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 050/113] KVM: VMX: Split out guts of EPT violation to common/exposed function isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 051/113] KVM: VMX: Move setting of EPT MMU masks to common VT-x code isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 052/113] KVM: TDX: Add accessors VMX VMCS helpers isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 053/113] KVM: TDX: Add load_mmu_pgd method for TDX isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 054/113] KVM: TDX: Retry seamcall when TDX_OPERAND_BUSY with operand SEPT isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 055/113] KVM: TDX: Require TDP MMU and mmio caching for TDX isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 056/113] KVM: TDX: TDP MMU TDX support isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 057/113] KVM: TDX: MTRR: implement get_mt_mask() for TDX isaku.yamahata
2023-03-16 10:38 ` Huang, Kai
2023-03-25 1:12 ` Isaku Yamahata
2023-03-27 9:54 ` Huang, Kai
2023-03-30 1:15 ` Isaku Yamahata
2023-03-30 1:36 ` Huang, Kai
2023-03-12 17:56 ` [PATCH v13 058/113] [MARKER] The start of TDX KVM patch series: TD finalization isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 059/113] KVM: x86/mmu: Introduce kvm_mmu_map_tdp_page() for use by TDX isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 060/113] KVM: TDX: Create initial guest memory isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 061/113] KVM: TDX: Finalize VM initialization isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 062/113] [MARKER] The start of TDX KVM patch series: TD vcpu enter/exit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 063/113] KVM: TDX: Add helper assembly function to TDX vcpu isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 064/113] KVM: TDX: Implement TDX vcpu enter/exit path isaku.yamahata
2023-04-11 12:49 ` Zhi Wang
2023-05-28 8:38 ` Isaku Yamahata
2023-03-12 17:56 ` [PATCH v13 065/113] KVM: TDX: vcpu_run: save/restore host state(host kernel gs) isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 066/113] KVM: TDX: restore host xsave state when exit from the guest TD isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 067/113] KVM: x86: Allow to update cached values in kvm_user_return_msrs w/o wrmsr isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 068/113] KVM: TDX: restore user ret MSRs isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 069/113] [MARKER] The start of TDX KVM patch series: TD vcpu exits/interrupts/hypercalls isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 070/113] KVM: TDX: complete interrupts after tdexit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 071/113] KVM: TDX: restore debug store when TD exit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 072/113] KVM: TDX: handle vcpu migration over logical processor isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 073/113] KVM: x86: Add a switch_db_regs flag to handle TDX's auto-switched behavior isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 074/113] KVM: TDX: Add support for find pending IRQ in a protected local APIC isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 075/113] KVM: x86: Assume timer IRQ was injected if APIC state is proteced isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 076/113] KVM: TDX: remove use of struct vcpu_vmx from posted_interrupt.c isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 077/113] KVM: TDX: Implement interrupt injection isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 078/113] KVM: TDX: Implements vcpu request_immediate_exit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 079/113] KVM: TDX: Implement methods to inject NMI isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 080/113] KVM: VMX: Modify NMI and INTR handlers to take intr_info as function argument isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 081/113] KVM: VMX: Move NMI/exception handler to common helper isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 082/113] KVM: x86: Split core of hypercall emulation to helper function isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 083/113] KVM: TDX: Add a place holder to handle TDX VM exit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 084/113] KVM: TDX: Handle vmentry failure for INTEL TD guest isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 085/113] KVM: TDX: handle EXIT_REASON_OTHER_SMI isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 086/113] KVM: TDX: handle ept violation/misconfig exit isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 087/113] KVM: TDX: handle EXCEPTION_NMI and EXTERNAL_INTERRUPT isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 088/113] KVM: TDX: Add a place holder for handler of TDX hypercalls (TDG.VP.VMCALL) isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 089/113] KVM: TDX: handle KVM hypercall with TDG.VP.VMCALL isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 090/113] KVM: TDX: Add KVM Exit for TDX TDG.VP.VMCALL isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 091/113] KVM: TDX: Handle TDX PV CPUID hypercall isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 092/113] KVM: TDX: Handle TDX PV HLT hypercall isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 093/113] KVM: TDX: Handle TDX PV port io hypercall isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 094/113] KVM: TDX: Handle TDX PV MMIO hypercall isaku.yamahata
2023-03-12 17:56 ` [PATCH v13 095/113] KVM: TDX: Implement callbacks for MSR operations for TDX isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 096/113] KVM: TDX: Handle TDX PV rdmsr/wrmsr hypercall isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 097/113] KVM: TDX: Handle TDX PV report fatal error hypercall isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 098/113] KVM: TDX: Handle TDX PV map_gpa hypercall isaku.yamahata
2023-04-18 19:09 ` Vishal Annapurve
2023-04-19 10:38 ` Zhi Wang
2023-04-27 2:15 ` Vishal Annapurve
2023-04-27 15:51 ` Sean Christopherson
2023-04-28 19:17 ` Ryan Afranji
2023-03-12 17:57 ` [PATCH v13 099/113] KVM: TDX: Handle TDG.VP.VMCALL<GetTdVmCallInfo> hypercall isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 100/113] KVM: TDX: Silently discard SMI request isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 101/113] KVM: TDX: Silently ignore INIT/SIPI isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 102/113] KVM: TDX: Add methods to ignore accesses to CPU state isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 103/113] KVM: TDX: Add methods to ignore guest instruction emulation isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 104/113] KVM: TDX: Add a method to ignore dirty logging isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 105/113] KVM: TDX: Add methods to ignore VMX preemption timer isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 106/113] KVM: TDX: Add methods to ignore accesses to TSC isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 107/113] KVM: TDX: Ignore setting up mce isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 108/113] KVM: TDX: Add a method to ignore for TDX to ignore hypercall patch isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 109/113] KVM: TDX: Add methods to ignore virtual apic related operation isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 110/113] Documentation/virt/kvm: Document on Trust Domain Extensions(TDX) isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 111/113] KVM: x86: design documentation on TDX support of x86 KVM TDP MMU isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 112/113] RFC: KVM: TDX: Make busy with S-EPT on entry bug isaku.yamahata
2023-03-12 17:57 ` [PATCH v13 113/113] [MARKER] the end of (the first phase of) TDX KVM patch series isaku.yamahata
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