From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>,
Rick P Edgecombe <rick.p.edgecombe@intel.com>
Cc: Kai Huang <kai.huang@intel.com>,
"isaku.yamahata@gmail.com" <isaku.yamahata@gmail.com>,
"sagis@google.com" <sagis@google.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Yan Y Zhao <yan.y.zhao@intel.com>,
Erdem Aktas <erdemaktas@google.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"dmatlack@google.com" <dmatlack@google.com>
Subject: Re: [PATCH 02/16] KVM: x86/mmu: Introduce a slot flag to zap only slot leafs on slot deletion
Date: Fri, 17 May 2024 17:27:32 +0200 [thread overview]
Message-ID: <fa88344c-cf0b-478f-9713-906aeb616da7@redhat.com> (raw)
In-Reply-To: <ZkUVcjYhgVpVcGAV@google.com>
On 5/15/24 22:05, Sean Christopherson wrote:
>> Again thinking of the userspace memory analogy... Aren't there some VMs where
>> the fast zap is faster? Like if you have guest with a small memslot that gets
>> deleted all the time, you could want it to be zapped specifically. But for the
>> giant memslot next to it, you might want to do the fast zap all thing.
>
> Yes. But...
On the other hand, tearing down a giant memslot isn't really common.
The main occurrence of memslots going away is 1) BIOS fiddling with low
memory permissions; 2) PCI BARs. The former is only happening at boot
and with small memslots, the latter can in principle involve large
memslots but... just don't do it.
Paolo
next prev parent reply other threads:[~2024-05-17 15:27 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-15 0:59 [PATCH 00/16] TDX MMU prep series part 1 Rick Edgecombe
2024-05-15 0:59 ` [PATCH 01/16] KVM: x86: Add a VM type define for TDX Rick Edgecombe
2024-05-15 0:59 ` [PATCH 02/16] KVM: x86/mmu: Introduce a slot flag to zap only slot leafs on slot deletion Rick Edgecombe
2024-05-15 13:24 ` Huang, Kai
2024-05-15 19:09 ` Sean Christopherson
2024-05-15 19:23 ` Edgecombe, Rick P
2024-05-15 20:05 ` Sean Christopherson
2024-05-15 20:53 ` Edgecombe, Rick P
2024-05-15 22:47 ` Sean Christopherson
2024-05-15 23:06 ` Huang, Kai
2024-05-15 23:20 ` Sean Christopherson
2024-05-15 23:36 ` Huang, Kai
2024-05-16 1:12 ` Xiaoyao Li
2024-05-17 15:30 ` Paolo Bonzini
2024-05-22 1:29 ` Yan Zhao
2024-05-22 2:31 ` Sean Christopherson
2024-05-22 6:48 ` Yan Zhao
2024-05-22 15:45 ` Paolo Bonzini
2024-05-24 1:50 ` Yan Zhao
2024-05-15 23:56 ` Edgecombe, Rick P
2024-05-16 2:21 ` Edgecombe, Rick P
2024-05-16 3:56 ` Yan Zhao
2024-05-17 15:27 ` Paolo Bonzini [this message]
2024-05-17 15:25 ` Paolo Bonzini
2024-05-15 18:03 ` Isaku Yamahata
2024-05-15 0:59 ` [PATCH 03/16] KVM: x86/tdp_mmu: Add a helper function to walk down the TDP MMU Rick Edgecombe
2024-05-17 7:44 ` Chao Gao
2024-05-17 9:08 ` Isaku Yamahata
2024-05-15 0:59 ` [PATCH 04/16] KVM: x86/mmu: Add address conversion functions for TDX shared bit of GPA Rick Edgecombe
2024-05-15 22:34 ` Huang, Kai
2024-05-15 23:21 ` Edgecombe, Rick P
2024-05-15 23:31 ` Huang, Kai
2024-05-15 23:38 ` Edgecombe, Rick P
2024-05-15 23:44 ` Huang, Kai
2024-05-15 23:59 ` Edgecombe, Rick P
2024-05-16 0:12 ` Huang, Kai
2024-05-16 0:19 ` Edgecombe, Rick P
2024-05-16 0:25 ` Huang, Kai
2024-05-16 0:35 ` Edgecombe, Rick P
2024-05-16 1:04 ` Huang, Kai
2024-05-16 1:20 ` Edgecombe, Rick P
2024-05-16 1:40 ` Huang, Kai
2024-05-16 5:52 ` Yan Zhao
2024-05-18 0:25 ` Edgecombe, Rick P
2024-05-16 23:08 ` Edgecombe, Rick P
2024-05-17 0:37 ` Huang, Kai
2024-05-17 1:51 ` Edgecombe, Rick P
2024-05-17 4:26 ` Huang, Kai
2024-05-17 21:12 ` Edgecombe, Rick P
2024-05-15 0:59 ` [PATCH 05/16] KVM: Add member to struct kvm_gfn_range for target alias Rick Edgecombe
2024-05-17 20:58 ` Edgecombe, Rick P
2024-05-15 0:59 ` [PATCH 06/16] KVM: x86/mmu: Add a new is_private member for union kvm_mmu_page_role Rick Edgecombe
2024-05-15 0:59 ` [PATCH 07/16] KVM: x86/mmu: Add a private pointer to struct kvm_mmu_page Rick Edgecombe
2024-05-15 0:59 ` [PATCH 08/16] KVM: x86/mmu: Bug the VM if kvm_zap_gfn_range() is called for TDX Rick Edgecombe
2024-05-15 13:27 ` Huang, Kai
2024-05-15 15:22 ` Edgecombe, Rick P
2024-05-15 23:14 ` Huang, Kai
2024-05-15 15:34 ` Sean Christopherson
2024-05-15 15:49 ` Edgecombe, Rick P
2024-05-15 15:56 ` Edgecombe, Rick P
2024-05-15 16:02 ` Sean Christopherson
2024-05-15 16:12 ` Edgecombe, Rick P
2024-05-15 18:09 ` Sean Christopherson
2024-05-15 18:22 ` Edgecombe, Rick P
2024-05-15 19:48 ` Sean Christopherson
2024-05-15 20:32 ` Edgecombe, Rick P
2024-05-15 23:26 ` Sean Christopherson
2024-05-15 16:22 ` Isaku Yamahata
2024-05-15 22:17 ` Huang, Kai
2024-05-15 23:14 ` Edgecombe, Rick P
2024-05-15 23:38 ` Huang, Kai
2024-05-16 0:13 ` Edgecombe, Rick P
2024-05-16 0:27 ` Isaku Yamahata
2024-05-16 1:11 ` Huang, Kai
2024-05-16 0:15 ` Isaku Yamahata
2024-05-16 0:52 ` Edgecombe, Rick P
2024-05-16 1:21 ` Huang, Kai
2024-05-16 17:27 ` Isaku Yamahata
2024-05-16 21:46 ` Edgecombe, Rick P
2024-05-16 22:23 ` Huang, Kai
2024-05-16 22:38 ` Edgecombe, Rick P
2024-05-16 23:16 ` Huang, Kai
2024-05-15 0:59 ` [PATCH 09/16] KVM: x86/mmu: Make kvm_tdp_mmu_alloc_root() return void Rick Edgecombe
2024-05-15 0:59 ` [PATCH 10/16] KVM: x86/tdp_mmu: Support TDX private mapping for TDP MMU Rick Edgecombe
2024-05-15 17:35 ` Isaku Yamahata
2024-05-15 18:00 ` Edgecombe, Rick P
2024-05-16 0:52 ` Huang, Kai
2024-05-16 1:27 ` Edgecombe, Rick P
2024-05-16 2:07 ` Huang, Kai
2024-05-16 2:57 ` Edgecombe, Rick P
2024-05-16 13:04 ` Huang, Kai
2024-05-16 16:36 ` Edgecombe, Rick P
2024-05-16 19:42 ` Isaku Yamahata
2024-05-17 2:35 ` Edgecombe, Rick P
2024-05-17 9:03 ` Isaku Yamahata
2024-05-17 18:16 ` Edgecombe, Rick P
2024-05-17 19:16 ` Isaku Yamahata
2024-05-20 23:32 ` Isaku Yamahata
2024-05-21 15:07 ` Edgecombe, Rick P
2024-05-21 16:15 ` Isaku Yamahata
2024-05-22 22:34 ` Isaku Yamahata
2024-05-22 23:09 ` Edgecombe, Rick P
2024-05-22 23:47 ` Isaku Yamahata
2024-05-22 23:50 ` Edgecombe, Rick P
2024-05-23 0:01 ` Isaku Yamahata
2024-05-23 18:27 ` Edgecombe, Rick P
2024-05-24 7:55 ` Isaku Yamahata
2024-05-28 16:27 ` Edgecombe, Rick P
2024-05-28 17:47 ` Paolo Bonzini
2024-05-29 2:13 ` Edgecombe, Rick P
2024-05-29 7:25 ` Paolo Bonzini
2024-05-31 14:11 ` Isaku Yamahata
2024-05-28 17:43 ` Paolo Bonzini
2024-05-28 17:16 ` Paolo Bonzini
2024-05-28 18:29 ` Edgecombe, Rick P
2024-05-29 1:06 ` Isaku Yamahata
2024-05-29 1:51 ` Edgecombe, Rick P
2024-05-17 2:36 ` Huang, Kai
2024-05-17 8:14 ` Isaku Yamahata
2024-05-18 5:42 ` Huang, Kai
2024-05-18 15:41 ` Edgecombe, Rick P
2024-05-20 10:38 ` Huang, Kai
2024-05-20 18:58 ` Isaku Yamahata
2024-05-20 19:02 ` Edgecombe, Rick P
2024-05-20 23:39 ` Edgecombe, Rick P
2024-05-21 2:25 ` Isaku Yamahata
2024-05-21 2:57 ` Edgecombe, Rick P
2024-05-20 22:34 ` Huang, Kai
2024-05-16 1:48 ` Isaku Yamahata
2024-05-16 2:00 ` Edgecombe, Rick P
2024-05-16 2:10 ` Huang, Kai
2024-05-28 16:59 ` Paolo Bonzini
2024-05-16 17:10 ` Isaku Yamahata
2024-05-23 23:14 ` Edgecombe, Rick P
2024-05-24 8:20 ` Isaku Yamahata
2024-05-28 21:48 ` Edgecombe, Rick P
2024-05-29 1:16 ` Isaku Yamahata
2024-05-29 1:50 ` Edgecombe, Rick P
2024-05-29 2:20 ` Isaku Yamahata
2024-05-29 2:29 ` Edgecombe, Rick P
2024-05-28 20:54 ` Edgecombe, Rick P
2024-05-29 1:24 ` Isaku Yamahata
2024-05-28 23:06 ` Edgecombe, Rick P
2024-05-29 1:57 ` Isaku Yamahata
2024-05-29 2:13 ` Edgecombe, Rick P
2024-05-29 16:55 ` Isaku Yamahata
2024-05-15 0:59 ` [PATCH 11/16] KVM: x86/tdp_mmu: Extract root invalid check from tdx_mmu_next_root() Rick Edgecombe
2024-05-15 0:59 ` [PATCH 12/16] KVM: x86/tdp_mmu: Introduce KVM MMU root types to specify page table type Rick Edgecombe
2024-05-15 0:59 ` [PATCH 13/16] KVM: x86/tdp_mmu: Introduce shared, private KVM MMU root types Rick Edgecombe
2024-05-15 0:59 ` [PATCH 14/16] KVM: x86/tdp_mmu: Take root types for kvm_tdp_mmu_invalidate_all_roots() Rick Edgecombe
2024-05-15 0:59 ` [PATCH 15/16] KVM: x86/tdp_mmu: Make mmu notifier callbacks to check kvm_process Rick Edgecombe
2024-05-15 0:59 ` [PATCH 16/16] KVM: x86/tdp_mmu: Invalidate correct roots Rick Edgecombe
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