From: Oliver Upton <oliver.upton@linux.dev>
To: Ricardo Koller <ricarkol@google.com>
Cc: Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Quentin Perret <qperret@google.com>,
Reiji Watanabe <reijiw@google.com>,
David Matlack <dmatlack@google.com>,
Ben Gardon <bgardon@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Gavin Shan <gshan@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make
Date: Mon, 10 Oct 2022 03:58:25 +0000 [thread overview]
Message-ID: <Y0OYYZwoaW36UQK/@google.com> (raw)
In-Reply-To: <YyEeOxDndbEVHuxE@google.com>
Hey Ricardo,
On Tue, Sep 13, 2022 at 05:20:11PM -0700, Ricardo Koller wrote:
[...]
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index d8127c25424c..5c0c8028d71c 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -763,17 +763,21 @@ static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
> > return 0;
> > }
> >
> > +static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
> > + struct stage2_map_data *data);
> > +
> > static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > kvm_pte_t *ptep,
> > struct stage2_map_data *data)
> > {
> > - if (data->anchor)
> > - return 0;
> > + struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
> > + kvm_pte_t *childp = kvm_pte_follow(*ptep, mm_ops);
> > + struct kvm_pgtable *pgt = data->mmu->pgt;
> > + int ret;
> >
> > if (!stage2_leaf_mapping_allowed(addr, end, level, data))
> > return 0;
> >
> > - data->childp = kvm_pte_follow(*ptep, data->mm_ops);
> > kvm_clear_pte(ptep);
> >
> > /*
> > @@ -782,8 +786,13 @@ static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > * individually.
> > */
> > kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
> > - data->anchor = ptep;
> > - return 0;
> > +
> > + ret = stage2_map_walk_leaf(addr, end, level, ptep, data);
>
> I think this always ends up calling stage2_map_walker_try_leaf() (at
> least it should). In that case, I think it might be clearer to do so, as
> the intention is to just install a block.
Yikes, I missed this in v2. I do agree with your point, it reads a bit
odd to call something that could reinstall a table.
Picked up the fix for v3. Thanks!
--
Best,
Oliver
WARNING: multiple messages have this Message-ID (diff)
From: Oliver Upton <oliver.upton@linux.dev>
To: Ricardo Koller <ricarkol@google.com>
Cc: kvm@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
linux-kernel@vger.kernel.org, Ben Gardon <bgardon@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
David Matlack <dmatlack@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 02/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make
Date: Mon, 10 Oct 2022 03:58:25 +0000 [thread overview]
Message-ID: <Y0OYYZwoaW36UQK/@google.com> (raw)
In-Reply-To: <YyEeOxDndbEVHuxE@google.com>
Hey Ricardo,
On Tue, Sep 13, 2022 at 05:20:11PM -0700, Ricardo Koller wrote:
[...]
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index d8127c25424c..5c0c8028d71c 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -763,17 +763,21 @@ static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
> > return 0;
> > }
> >
> > +static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
> > + struct stage2_map_data *data);
> > +
> > static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > kvm_pte_t *ptep,
> > struct stage2_map_data *data)
> > {
> > - if (data->anchor)
> > - return 0;
> > + struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
> > + kvm_pte_t *childp = kvm_pte_follow(*ptep, mm_ops);
> > + struct kvm_pgtable *pgt = data->mmu->pgt;
> > + int ret;
> >
> > if (!stage2_leaf_mapping_allowed(addr, end, level, data))
> > return 0;
> >
> > - data->childp = kvm_pte_follow(*ptep, data->mm_ops);
> > kvm_clear_pte(ptep);
> >
> > /*
> > @@ -782,8 +786,13 @@ static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > * individually.
> > */
> > kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
> > - data->anchor = ptep;
> > - return 0;
> > +
> > + ret = stage2_map_walk_leaf(addr, end, level, ptep, data);
>
> I think this always ends up calling stage2_map_walker_try_leaf() (at
> least it should). In that case, I think it might be clearer to do so, as
> the intention is to just install a block.
Yikes, I missed this in v2. I do agree with your point, it reads a bit
odd to call something that could reinstall a table.
Picked up the fix for v3. Thanks!
--
Best,
Oliver
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
WARNING: multiple messages have this Message-ID (diff)
From: Oliver Upton <oliver.upton@linux.dev>
To: Ricardo Koller <ricarkol@google.com>
Cc: Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Quentin Perret <qperret@google.com>,
Reiji Watanabe <reijiw@google.com>,
David Matlack <dmatlack@google.com>,
Ben Gardon <bgardon@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Gavin Shan <gshan@redhat.com>, Peter Xu <peterx@redhat.com>,
Sean Christopherson <seanjc@google.com>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make
Date: Mon, 10 Oct 2022 03:58:25 +0000 [thread overview]
Message-ID: <Y0OYYZwoaW36UQK/@google.com> (raw)
In-Reply-To: <YyEeOxDndbEVHuxE@google.com>
Hey Ricardo,
On Tue, Sep 13, 2022 at 05:20:11PM -0700, Ricardo Koller wrote:
[...]
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index d8127c25424c..5c0c8028d71c 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -763,17 +763,21 @@ static int stage2_map_walker_try_leaf(u64 addr, u64 end, u32 level,
> > return 0;
> > }
> >
> > +static int stage2_map_walk_leaf(u64 addr, u64 end, u32 level, kvm_pte_t *ptep,
> > + struct stage2_map_data *data);
> > +
> > static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > kvm_pte_t *ptep,
> > struct stage2_map_data *data)
> > {
> > - if (data->anchor)
> > - return 0;
> > + struct kvm_pgtable_mm_ops *mm_ops = data->mm_ops;
> > + kvm_pte_t *childp = kvm_pte_follow(*ptep, mm_ops);
> > + struct kvm_pgtable *pgt = data->mmu->pgt;
> > + int ret;
> >
> > if (!stage2_leaf_mapping_allowed(addr, end, level, data))
> > return 0;
> >
> > - data->childp = kvm_pte_follow(*ptep, data->mm_ops);
> > kvm_clear_pte(ptep);
> >
> > /*
> > @@ -782,8 +786,13 @@ static int stage2_map_walk_table_pre(u64 addr, u64 end, u32 level,
> > * individually.
> > */
> > kvm_call_hyp(__kvm_tlb_flush_vmid, data->mmu);
> > - data->anchor = ptep;
> > - return 0;
> > +
> > + ret = stage2_map_walk_leaf(addr, end, level, ptep, data);
>
> I think this always ends up calling stage2_map_walker_try_leaf() (at
> least it should). In that case, I think it might be clearer to do so, as
> the intention is to just install a block.
Yikes, I missed this in v2. I do agree with your point, it reads a bit
odd to call something that could reinstall a table.
Picked up the fix for v3. Thanks!
--
Best,
Oliver
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-10-10 3:58 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-30 19:41 [PATCH 00/14] KVM: arm64: Parallel stage-2 fault handling Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 01/14] KVM: arm64: Add a helper to tear down unlinked stage-2 subtrees Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 02/14] KVM: arm64: Tear down unlinked stage-2 subtree after break-before-make Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-09-06 14:35 ` Quentin Perret
2022-09-06 14:35 ` Quentin Perret
2022-09-06 14:35 ` Quentin Perret
2022-09-09 10:04 ` Oliver Upton
2022-09-09 10:04 ` Oliver Upton
2022-09-09 10:04 ` Oliver Upton
2022-09-07 20:57 ` David Matlack
2022-09-07 20:57 ` David Matlack
2022-09-07 20:57 ` David Matlack
2022-09-09 10:07 ` Oliver Upton
2022-09-09 10:07 ` Oliver Upton
2022-09-09 10:07 ` Oliver Upton
2022-09-14 0:20 ` Ricardo Koller
2022-09-14 0:20 ` Ricardo Koller
2022-09-14 0:20 ` Ricardo Koller
2022-10-10 3:58 ` Oliver Upton [this message]
2022-10-10 3:58 ` Oliver Upton
2022-10-10 3:58 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 03/14] KVM: arm64: Directly read owner id field in stage2_pte_is_counted() Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 04/14] KVM: arm64: Read the PTE once per visit Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 05/14] KVM: arm64: Split init and set for table PTE Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 06/14] KVM: arm64: Return next table from map callbacks Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-09-07 21:32 ` David Matlack
2022-09-07 21:32 ` David Matlack
2022-09-07 21:32 ` David Matlack
2022-09-09 9:38 ` Oliver Upton
2022-09-09 9:38 ` Oliver Upton
2022-09-09 9:38 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 07/14] KVM: arm64: Document behavior of pgtable visitor callback Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 08/14] KVM: arm64: Protect page table traversal with RCU Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-09-07 21:47 ` David Matlack
2022-09-07 21:47 ` David Matlack
2022-09-07 21:47 ` David Matlack
2022-09-09 9:55 ` Oliver Upton
2022-09-09 9:55 ` Oliver Upton
2022-09-09 9:55 ` Oliver Upton
2022-08-30 19:41 ` [PATCH 09/14] KVM: arm64: Free removed stage-2 tables in RCU callback Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-08-30 19:41 ` Oliver Upton
2022-09-07 22:00 ` David Matlack
2022-09-07 22:00 ` David Matlack
2022-09-07 22:00 ` David Matlack
2022-09-08 16:40 ` David Matlack
2022-09-08 16:40 ` David Matlack
2022-09-08 16:40 ` David Matlack
2022-09-14 0:49 ` Ricardo Koller
2022-09-14 0:49 ` Ricardo Koller
2022-09-14 0:49 ` Ricardo Koller
2022-08-30 19:50 ` [PATCH 10/14] KVM: arm64: Atomically update stage 2 leaf attributes in parallel walks Oliver Upton
2022-08-30 19:50 ` Oliver Upton
2022-08-30 19:50 ` Oliver Upton
2022-08-30 19:51 ` [PATCH 11/14] KVM: arm64: Make changes block->table to leaf PTEs parallel-aware Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-09-14 0:51 ` Ricardo Koller
2022-09-14 0:51 ` Ricardo Koller
2022-09-14 0:51 ` Ricardo Koller
2022-09-14 0:53 ` Ricardo Koller
2022-09-14 0:53 ` Ricardo Koller
2022-09-14 0:53 ` Ricardo Koller
2022-08-30 19:51 ` [PATCH 12/14] KVM: arm64: Make leaf->leaf PTE changes parallel-aware Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-08-30 19:51 ` [PATCH 13/14] KVM: arm64: Make table->block " Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-08-30 19:51 ` Oliver Upton
2022-08-30 19:52 ` [PATCH 14/14] KVM: arm64: Handle stage-2 faults in parallel Oliver Upton
2022-08-30 19:52 ` Oliver Upton
2022-08-30 19:52 ` Oliver Upton
2022-09-06 10:00 ` [PATCH 00/14] KVM: arm64: Parallel stage-2 fault handling Marc Zyngier
2022-09-06 10:00 ` Marc Zyngier
2022-09-06 10:00 ` Marc Zyngier
2022-09-09 10:01 ` Oliver Upton
2022-09-09 10:01 ` Oliver Upton
2022-09-09 10:01 ` Oliver Upton
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