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From: Paolo Bonzini <pbonzini@redhat.com>
To: Yu Zhang <yu.c.zhang@linux.intel.com>, Ben Gardon <bgardon@google.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	Cannon Matthews <cannonmatthews@google.com>,
	Peter Xu <peterx@redhat.com>,
	Sean Christopherson <sean.j.christopherson@intel.com>,
	Peter Shier <pshier@google.com>,
	Peter Feiner <pfeiner@google.com>,
	Junaid Shahid <junaids@google.com>,
	Jim Mattson <jmattson@google.com>,
	Yulei Zhang <yulei.kernel@gmail.com>,
	Wanpeng Li <kernellwp@gmail.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Xiao Guangrong <xiaoguangrong.eric@gmail.com>
Subject: Re: [PATCH v2 07/20] kvm: x86/mmu: Support zapping SPTEs in the TDP MMU
Date: Wed, 21 Oct 2020 19:20:15 +0200	[thread overview]
Message-ID: <6985f630-3b2a-75f5-5b55-bd76cf32f20b@redhat.com> (raw)
In-Reply-To: <20201021150225.2eeriqlffqnsm4b3@linux.intel.com>

On 21/10/20 17:02, Yu Zhang wrote:
>>  void kvm_tdp_mmu_free_root(struct kvm *kvm, struct kvm_mmu_page *root)
>>  {
>> +	gfn_t max_gfn = 1ULL << (boot_cpu_data.x86_phys_bits - PAGE_SHIFT);
>> +
> boot_cpu_data.x86_phys_bits is the host address width. Value of the guest's
> may vary. So maybe we should just traverse the memslots and zap the gfn ranges
> in each of them?
> 

It must be smaller than the host value for two-dimensional paging, though.

Paolo


  reply	other threads:[~2020-10-21 17:20 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-14 18:26 [PATCH v2 00/20] Introduce the TDP MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 01/20] kvm: x86/mmu: Separate making SPTEs from set_spte Ben Gardon
2020-10-14 18:26 ` [PATCH v2 02/20] kvm: x86/mmu: Introduce tdp_iter Ben Gardon
2020-10-21 14:58   ` Yu Zhang
2020-10-21 18:08     ` Ben Gardon
2020-10-22  2:34       ` Yu Zhang
2020-10-14 18:26 ` [PATCH v2 03/20] kvm: x86/mmu: Init / Uninit the TDP MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 04/20] kvm: x86/mmu: Allocate and free TDP MMU roots Ben Gardon
2020-10-16 14:56   ` Paolo Bonzini
2020-10-19 17:02     ` Ben Gardon
2020-10-21 15:09   ` Yu Zhang
2020-10-21 17:54     ` Ben Gardon
2020-10-21 18:01       ` Paolo Bonzini
2020-10-14 18:26 ` [PATCH v2 05/20] kvm: x86/mmu: Add functions to handle changed TDP SPTEs Ben Gardon
2020-10-14 18:26 ` [PATCH v2 06/20] KVM: Cache as_id in kvm_memory_slot Ben Gardon
2020-10-14 18:26 ` [PATCH v2 07/20] kvm: x86/mmu: Support zapping SPTEs in the TDP MMU Ben Gardon
2020-10-19 20:49   ` Edgecombe, Rick P
2020-10-19 21:33     ` Ben Gardon
2020-10-21 15:02   ` Yu Zhang
2020-10-21 17:20     ` Paolo Bonzini [this message]
2020-10-21 17:24       ` Yu Zhang
2020-10-21 18:00         ` Paolo Bonzini
2020-10-22  2:24           ` Yu Zhang
2020-10-14 18:26 ` [PATCH v2 08/20] kvm: x86/mmu: Separate making non-leaf sptes from link_shadow_page Ben Gardon
2020-10-14 18:26 ` [PATCH v2 09/20] kvm: x86/mmu: Remove disallowed_hugepage_adjust shadow_walk_iterator arg Ben Gardon
2020-10-14 18:26 ` [PATCH v2 10/20] kvm: x86/mmu: Add TDP MMU PF handler Ben Gardon
2020-10-16 15:12   ` Paolo Bonzini
2020-10-14 18:26 ` [PATCH v2 11/20] kvm: x86/mmu: Allocate struct kvm_mmu_pages for all pages in TDP MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 12/20] kvm: x86/mmu: Support invalidate range MMU notifier for " Ben Gardon
2020-10-14 18:26 ` [PATCH v2 13/20] kvm: x86/mmu: Add access tracking for tdp_mmu Ben Gardon
2020-10-14 18:26 ` [PATCH v2 14/20] kvm: x86/mmu: Support changed pte notifier in tdp MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 15/20] kvm: x86/mmu: Support dirty logging for the TDP MMU Ben Gardon
2020-10-16 16:18   ` Paolo Bonzini
2020-10-19 17:07     ` Ben Gardon
2020-10-19 17:42       ` Paolo Bonzini
2020-10-14 18:26 ` [PATCH v2 16/20] kvm: x86/mmu: Support disabling dirty logging for the tdp MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 17/20] kvm: x86/mmu: Support write protection for nesting in " Ben Gardon
2020-10-16 16:18   ` Paolo Bonzini
2020-10-14 18:26 ` [PATCH v2 18/20] kvm: x86/mmu: Support MMIO in the TDP MMU Ben Gardon
2020-10-14 18:26 ` [PATCH v2 19/20] kvm: x86/mmu: Don't clear write flooding count for direct roots Ben Gardon
2020-10-14 18:27 ` [PATCH v2 20/20] kvm: x86/mmu: NX largepage recovery for TDP MMU Ben Gardon
2020-10-16 16:50 ` [PATCH v2 00/20] Introduce the " Paolo Bonzini
2020-10-19 18:15   ` Ben Gardon
2020-10-20  8:07     ` Paolo Bonzini

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