From: Peter Xu <peterx@redhat.com>
To: David Matlack <dmatlack@google.com>
Cc: Marc Zyngier <maz@kernel.org>, Albert Ou <aou@eecs.berkeley.edu>,
"open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)"
<kvm@vger.kernel.org>, Huacai Chen <chenhuacai@kernel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR MIPS \(KVM/mips\)"
<linux-mips@vger.kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
"open list:KERNEL VIRTUAL MACHINE FOR RISC-V \(KVM/riscv\)"
<kvm-riscv@lists.infradead.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Ben Gardon <bgardon@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"Maciej S. Szmigiero" <maciej.szmigiero@oracle.com>,
"moderated list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)"
<kvmarm@lists.cs.columbia.edu>, Peter Feiner <pfeiner@google.com>
Subject: Re: [PATCH v2 20/26] KVM: x86/mmu: Extend Eager Page Splitting to the shadow MMU
Date: Wed, 30 Mar 2022 14:34:21 -0400 [thread overview]
Message-ID: <YkSirYT6s8YtUr4w@xz-m1.local> (raw)
In-Reply-To: <CALzav=fRFzbGEVhdMSwhX1Gs1++DGW6MOWvKzeQ-RTtLsus=SQ@mail.gmail.com>
On Tue, Mar 22, 2022 at 04:58:08PM -0700, David Matlack wrote:
> > > +static int prepare_to_split_huge_page(struct kvm *kvm,
> > > + const struct kvm_memory_slot *slot,
> > > + u64 *huge_sptep,
> > > + struct kvm_mmu_page **spp,
> > > + bool *flush,
> > > + bool *dropped_lock)
> > > +{
> > > + int r = 0;
> > > +
> > > + *dropped_lock = false;
> > > +
> > > + if (kvm_mmu_available_pages(kvm) <= KVM_MIN_FREE_MMU_PAGES)
> > > + return -ENOSPC;
> > > +
> > > + if (need_resched() || rwlock_needbreak(&kvm->mmu_lock))
> > > + goto drop_lock;
> > > +
> >
> > Not immediately clear on whether there'll be case that *spp is set within
> > the current function. Some sanity check might be nice?
>
> Sorry I'm not sure what you mean here. What kind of sanity check did
> you have in mind?
Something like "WARN_ON_ONCE(*spp);"?
>
> >
> > > + *spp = kvm_mmu_alloc_direct_sp_for_split(true);
> > > + if (r)
> > > + goto drop_lock;
> > > +
> > > + return 0;
Thanks,
--
Peter Xu
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next prev parent reply other threads:[~2022-03-30 18:34 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-11 0:25 [PATCH v2 00/26] Extend Eager Page Splitting to the shadow MMU David Matlack
2022-03-11 0:25 ` [PATCH v2 01/26] KVM: x86/mmu: Optimize MMU page cache lookup for all direct SPs David Matlack
2022-03-15 7:40 ` Peter Xu
2022-03-22 18:16 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 02/26] KVM: x86/mmu: Use a bool for direct David Matlack
2022-03-15 7:46 ` Peter Xu
2022-03-22 18:21 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 03/26] KVM: x86/mmu: Derive shadow MMU page role from parent David Matlack
2022-03-15 8:15 ` Peter Xu
2022-03-22 18:30 ` David Matlack
2022-03-30 14:25 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 04/26] KVM: x86/mmu: Decompose kvm_mmu_get_page() into separate functions David Matlack
2022-03-15 8:50 ` Peter Xu
2022-03-22 22:09 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 05/26] KVM: x86/mmu: Rename shadow MMU functions that deal with shadow pages David Matlack
2022-03-15 8:52 ` Peter Xu
2022-03-22 21:35 ` David Matlack
2022-03-30 14:28 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 06/26] KVM: x86/mmu: Pass memslot to kvm_mmu_new_shadow_page() David Matlack
2022-03-15 9:03 ` Peter Xu
2022-03-22 22:05 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 07/26] KVM: x86/mmu: Separate shadow MMU sp allocation from initialization David Matlack
2022-03-15 9:54 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 08/26] KVM: x86/mmu: Link spt to sp during allocation David Matlack
2022-03-15 10:04 ` Peter Xu
2022-03-22 22:30 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 09/26] KVM: x86/mmu: Move huge page split sp allocation code to mmu.c David Matlack
2022-03-15 10:17 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 10/26] KVM: x86/mmu: Use common code to free kvm_mmu_page structs David Matlack
2022-03-15 10:22 ` Peter Xu
2022-03-22 22:33 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 11/26] KVM: x86/mmu: Use common code to allocate kvm_mmu_page structs from vCPU caches David Matlack
2022-03-15 10:27 ` Peter Xu
2022-03-22 22:35 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 12/26] KVM: x86/mmu: Pass const memslot to rmap_add() David Matlack
2022-03-11 0:25 ` [PATCH v2 13/26] KVM: x86/mmu: Pass const memslot to init_shadow_page() and descendants David Matlack
2022-03-11 0:25 ` [PATCH v2 14/26] KVM: x86/mmu: Decouple rmap_add() and link_shadow_page() from kvm_vcpu David Matlack
2022-03-15 10:37 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 15/26] KVM: x86/mmu: Update page stats in __rmap_add() David Matlack
2022-03-15 10:39 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 16/26] KVM: x86/mmu: Cache the access bits of shadowed translations David Matlack
2022-03-16 8:32 ` Peter Xu
2022-03-22 22:51 ` David Matlack
2022-03-30 18:30 ` Peter Xu
2022-03-31 21:40 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 17/26] KVM: x86/mmu: Pass access information to make_huge_page_split_spte() David Matlack
2022-03-16 8:44 ` Peter Xu
2022-03-22 23:08 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 18/26] KVM: x86/mmu: Zap collapsible SPTEs at all levels in the shadow MMU David Matlack
2022-03-16 8:49 ` Peter Xu
2022-03-22 23:11 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 19/26] KVM: x86/mmu: Refactor drop_large_spte() David Matlack
2022-03-16 8:53 ` Peter Xu
2022-03-11 0:25 ` [PATCH v2 20/26] KVM: x86/mmu: Extend Eager Page Splitting to the shadow MMU David Matlack
2022-03-16 10:26 ` Peter Xu
2022-03-22 0:07 ` David Matlack
2022-03-22 23:58 ` David Matlack
2022-03-30 18:34 ` Peter Xu [this message]
2022-03-31 19:57 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 21/26] KVM: Allow for different capacities in kvm_mmu_memory_cache structs David Matlack
2022-03-19 5:27 ` Anup Patel
2022-03-22 23:13 ` David Matlack
2022-03-11 0:25 ` [PATCH v2 22/26] KVM: Allow GFP flags to be passed when topping up MMU caches David Matlack
2022-03-11 0:25 ` [PATCH v2 23/26] KVM: x86/mmu: Fully split huge pages that require extra pte_list_desc structs David Matlack
2022-03-11 0:25 ` [PATCH v2 24/26] KVM: x86/mmu: Split huge pages aliased by multiple SPTEs David Matlack
2022-03-11 0:25 ` [PATCH v2 25/26] KVM: x86/mmu: Drop NULL pte_list_desc_cache fallback David Matlack
2022-03-11 0:25 ` [PATCH v2 26/26] KVM: selftests: Map x86_64 guest virtual memory with huge pages David Matlack
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