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From: Quentin Perret <qperret@google.com>
To: Fuad Tabba <tabba@google.com>
Cc: maz@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com,
	suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	ardb@kernel.org, qwandor@google.com, dbrazdil@google.com,
	kernel-team@android.com
Subject: Re: [PATCH v3 16/21] KVM: arm64: Enable retrieving protections attributes of PTEs
Date: Tue, 3 Aug 2021 11:24:14 +0100	[thread overview]
Message-ID: <YQkZTnVLwVYDFvoA@google.com> (raw)
In-Reply-To: <CA+EHjTwL+grX__03SfeDdxeppjSovEZhKRvqjmA_4kSBwsjswg@mail.gmail.com>

On Monday 02 Aug 2021 at 16:52:49 (+0200), Fuad Tabba wrote:
> Hi Quentin,
> 
> On Thu, Jul 29, 2021 at 3:29 PM Quentin Perret <qperret@google.com> wrote:
> >
> > Introduce helper functions in the KVM stage-2 and stage-1 page-table
> > manipulation library allowing to retrieve the enum kvm_pgtable_prot of a
> > PTE. This will be useful to implement custom walkers outside of
> > pgtable.c.
> >
> > Signed-off-by: Quentin Perret <qperret@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_pgtable.h | 20 +++++++++++++++
> >  arch/arm64/kvm/hyp/pgtable.c         | 37 ++++++++++++++++++++++++++++
> >  2 files changed, 57 insertions(+)
> >
> > diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
> > index d5ca9b6ce241..7ff9f52239ba 100644
> > --- a/arch/arm64/include/asm/kvm_pgtable.h
> > +++ b/arch/arm64/include/asm/kvm_pgtable.h
> > @@ -505,4 +505,24 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
> >   */
> >  int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
> >                          kvm_pte_t *ptep, u32 *level);
> > +
> > +/**
> > + * kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a
> > + *                                stage-2 Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte);
> > +
> > +/**
> > + * kvm_pgtable_hyp_pte_prot() - Retrieve the protection attributes of a stage-1
> > + *                             Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte);
> >  #endif /* __ARM64_KVM_PGTABLE_H__ */
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index 1915489bb127..a6eda8f23cb6 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -363,6 +363,26 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
> >         return 0;
> >  }
> >
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte)
> > +{
> > +       enum kvm_pgtable_prot prot = pte & KVM_PTE_LEAF_ATTR_HI_SW;
> > +       u32 ap;
> > +
> > +       if (!kvm_pte_valid(pte))
> > +               return prot;
> > +
> > +       if (!(pte & KVM_PTE_LEAF_ATTR_HI_S1_XN))
> > +               prot |= KVM_PGTABLE_PROT_X;
> > +
> > +       ap = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S1_AP, pte);
> > +       if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RO)
> > +               prot |= KVM_PGTABLE_PROT_R;
> > +       else if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RW)
> > +               prot |= KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W;
> 
> nit: why not use the freshly minted KVM_PGTABLE_PROT_RW?

No good reason, I'll fix that up, thanks!

WARNING: multiple messages have this Message-ID
From: Quentin Perret <qperret@google.com>
To: Fuad Tabba <tabba@google.com>
Cc: kernel-team@android.com, qwandor@google.com, maz@kernel.org,
	linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
	will@kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 16/21] KVM: arm64: Enable retrieving protections attributes of PTEs
Date: Tue, 3 Aug 2021 11:24:14 +0100	[thread overview]
Message-ID: <YQkZTnVLwVYDFvoA@google.com> (raw)
In-Reply-To: <CA+EHjTwL+grX__03SfeDdxeppjSovEZhKRvqjmA_4kSBwsjswg@mail.gmail.com>

On Monday 02 Aug 2021 at 16:52:49 (+0200), Fuad Tabba wrote:
> Hi Quentin,
> 
> On Thu, Jul 29, 2021 at 3:29 PM Quentin Perret <qperret@google.com> wrote:
> >
> > Introduce helper functions in the KVM stage-2 and stage-1 page-table
> > manipulation library allowing to retrieve the enum kvm_pgtable_prot of a
> > PTE. This will be useful to implement custom walkers outside of
> > pgtable.c.
> >
> > Signed-off-by: Quentin Perret <qperret@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_pgtable.h | 20 +++++++++++++++
> >  arch/arm64/kvm/hyp/pgtable.c         | 37 ++++++++++++++++++++++++++++
> >  2 files changed, 57 insertions(+)
> >
> > diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
> > index d5ca9b6ce241..7ff9f52239ba 100644
> > --- a/arch/arm64/include/asm/kvm_pgtable.h
> > +++ b/arch/arm64/include/asm/kvm_pgtable.h
> > @@ -505,4 +505,24 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
> >   */
> >  int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
> >                          kvm_pte_t *ptep, u32 *level);
> > +
> > +/**
> > + * kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a
> > + *                                stage-2 Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte);
> > +
> > +/**
> > + * kvm_pgtable_hyp_pte_prot() - Retrieve the protection attributes of a stage-1
> > + *                             Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte);
> >  #endif /* __ARM64_KVM_PGTABLE_H__ */
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index 1915489bb127..a6eda8f23cb6 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -363,6 +363,26 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
> >         return 0;
> >  }
> >
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte)
> > +{
> > +       enum kvm_pgtable_prot prot = pte & KVM_PTE_LEAF_ATTR_HI_SW;
> > +       u32 ap;
> > +
> > +       if (!kvm_pte_valid(pte))
> > +               return prot;
> > +
> > +       if (!(pte & KVM_PTE_LEAF_ATTR_HI_S1_XN))
> > +               prot |= KVM_PGTABLE_PROT_X;
> > +
> > +       ap = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S1_AP, pte);
> > +       if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RO)
> > +               prot |= KVM_PGTABLE_PROT_R;
> > +       else if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RW)
> > +               prot |= KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W;
> 
> nit: why not use the freshly minted KVM_PGTABLE_PROT_RW?

No good reason, I'll fix that up, thanks!
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID
From: Quentin Perret <qperret@google.com>
To: Fuad Tabba <tabba@google.com>
Cc: maz@kernel.org, james.morse@arm.com, alexandru.elisei@arm.com,
	suzuki.poulose@arm.com, catalin.marinas@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	ardb@kernel.org, qwandor@google.com, dbrazdil@google.com,
	kernel-team@android.com
Subject: Re: [PATCH v3 16/21] KVM: arm64: Enable retrieving protections attributes of PTEs
Date: Tue, 3 Aug 2021 11:24:14 +0100	[thread overview]
Message-ID: <YQkZTnVLwVYDFvoA@google.com> (raw)
In-Reply-To: <CA+EHjTwL+grX__03SfeDdxeppjSovEZhKRvqjmA_4kSBwsjswg@mail.gmail.com>

On Monday 02 Aug 2021 at 16:52:49 (+0200), Fuad Tabba wrote:
> Hi Quentin,
> 
> On Thu, Jul 29, 2021 at 3:29 PM Quentin Perret <qperret@google.com> wrote:
> >
> > Introduce helper functions in the KVM stage-2 and stage-1 page-table
> > manipulation library allowing to retrieve the enum kvm_pgtable_prot of a
> > PTE. This will be useful to implement custom walkers outside of
> > pgtable.c.
> >
> > Signed-off-by: Quentin Perret <qperret@google.com>
> > ---
> >  arch/arm64/include/asm/kvm_pgtable.h | 20 +++++++++++++++
> >  arch/arm64/kvm/hyp/pgtable.c         | 37 ++++++++++++++++++++++++++++
> >  2 files changed, 57 insertions(+)
> >
> > diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
> > index d5ca9b6ce241..7ff9f52239ba 100644
> > --- a/arch/arm64/include/asm/kvm_pgtable.h
> > +++ b/arch/arm64/include/asm/kvm_pgtable.h
> > @@ -505,4 +505,24 @@ int kvm_pgtable_walk(struct kvm_pgtable *pgt, u64 addr, u64 size,
> >   */
> >  int kvm_pgtable_get_leaf(struct kvm_pgtable *pgt, u64 addr,
> >                          kvm_pte_t *ptep, u32 *level);
> > +
> > +/**
> > + * kvm_pgtable_stage2_pte_prot() - Retrieve the protection attributes of a
> > + *                                stage-2 Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_stage2_pte_prot(kvm_pte_t pte);
> > +
> > +/**
> > + * kvm_pgtable_hyp_pte_prot() - Retrieve the protection attributes of a stage-1
> > + *                             Page-Table Entry.
> > + * @pte:       Page-table entry
> > + *
> > + * Return: protection attributes of the page-table entry in the enum
> > + *        kvm_pgtable_prot format.
> > + */
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte);
> >  #endif /* __ARM64_KVM_PGTABLE_H__ */
> > diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> > index 1915489bb127..a6eda8f23cb6 100644
> > --- a/arch/arm64/kvm/hyp/pgtable.c
> > +++ b/arch/arm64/kvm/hyp/pgtable.c
> > @@ -363,6 +363,26 @@ static int hyp_set_prot_attr(enum kvm_pgtable_prot prot, kvm_pte_t *ptep)
> >         return 0;
> >  }
> >
> > +enum kvm_pgtable_prot kvm_pgtable_hyp_pte_prot(kvm_pte_t pte)
> > +{
> > +       enum kvm_pgtable_prot prot = pte & KVM_PTE_LEAF_ATTR_HI_SW;
> > +       u32 ap;
> > +
> > +       if (!kvm_pte_valid(pte))
> > +               return prot;
> > +
> > +       if (!(pte & KVM_PTE_LEAF_ATTR_HI_S1_XN))
> > +               prot |= KVM_PGTABLE_PROT_X;
> > +
> > +       ap = FIELD_GET(KVM_PTE_LEAF_ATTR_LO_S1_AP, pte);
> > +       if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RO)
> > +               prot |= KVM_PGTABLE_PROT_R;
> > +       else if (ap == KVM_PTE_LEAF_ATTR_LO_S1_AP_RW)
> > +               prot |= KVM_PGTABLE_PROT_R | KVM_PGTABLE_PROT_W;
> 
> nit: why not use the freshly minted KVM_PGTABLE_PROT_RW?

No good reason, I'll fix that up, thanks!

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-08-03 10:25 UTC|newest]

Thread overview: 135+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-29 13:27 [PATCH v3 00/21] Track shared pages at EL2 in protected mode Quentin Perret
2021-07-29 13:27 ` Quentin Perret
2021-07-29 13:27 ` Quentin Perret
2021-07-29 13:27 ` [PATCH v3 01/21] KVM: arm64: Add hyp_spin_is_locked() for basic locking assertions at EL2 Quentin Perret
2021-07-29 13:27   ` Quentin Perret
2021-07-29 13:27   ` Quentin Perret
2021-07-29 13:27 ` [PATCH v3 02/21] KVM: arm64: Introduce hyp_assert_lock_held() Quentin Perret
2021-07-29 13:27   ` Quentin Perret
2021-07-29 13:27   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 03/21] KVM: arm64: Provide the host_stage2_try() helper macro Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:36   ` Fuad Tabba
2021-08-02  9:36     ` Fuad Tabba
2021-08-02  9:36     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 04/21] KVM: arm64: Introduce helper to retrieve a PTE and its level Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 05/21] KVM: arm64: Expose page-table helpers Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 06/21] KVM: arm64: Optimize host memory aborts Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:37   ` Fuad Tabba
2021-08-02  9:37     ` Fuad Tabba
2021-08-02  9:37     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 07/21] KVM: arm64: Rename KVM_PTE_LEAF_ATTR_S2_IGNORED Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:37   ` Fuad Tabba
2021-08-02  9:37     ` Fuad Tabba
2021-08-02  9:37     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 08/21] KVM: arm64: Don't overwrite software bits with owner id Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:38   ` Fuad Tabba
2021-08-02  9:38     ` Fuad Tabba
2021-08-02  9:38     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 09/21] KVM: arm64: Tolerate re-creating hyp mappings to set software bits Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:50   ` Fuad Tabba
2021-08-02  9:50     ` Fuad Tabba
2021-08-02  9:50     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 10/21] KVM: arm64: Enable forcing page-level stage-2 mappings Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02  9:49   ` Fuad Tabba
2021-08-02  9:49     ` Fuad Tabba
2021-08-02  9:49     ` Fuad Tabba
2021-08-03 10:13     ` Quentin Perret
2021-08-03 10:13       ` Quentin Perret
2021-08-03 10:13       ` Quentin Perret
2021-08-03 10:43       ` Fuad Tabba
2021-08-03 10:43         ` Fuad Tabba
2021-08-03 10:43         ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 11/21] KVM: arm64: Allow populating software bits Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 12/21] KVM: arm64: Add helpers to tag shared pages in SW bits Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02 10:30   ` Fuad Tabba
2021-08-02 10:30     ` Fuad Tabba
2021-08-02 10:30     ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 13/21] KVM: arm64: Expose host stage-2 manipulation helpers Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02 11:13   ` Fuad Tabba
2021-08-02 11:13     ` Fuad Tabba
2021-08-02 11:13     ` Fuad Tabba
2021-08-03 10:20     ` Quentin Perret
2021-08-03 10:20       ` Quentin Perret
2021-08-03 10:20       ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 14/21] KVM: arm64: Expose pkvm_hyp_id Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 15/21] KVM: arm64: Introduce addr_is_memory() Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02 14:52   ` Fuad Tabba
2021-08-02 14:52     ` Fuad Tabba
2021-08-02 14:52     ` Fuad Tabba
2021-08-03 10:23     ` Quentin Perret
2021-08-03 10:23       ` Quentin Perret
2021-08-03 10:23       ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 16/21] KVM: arm64: Enable retrieving protections attributes of PTEs Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-02 14:52   ` Fuad Tabba
2021-08-02 14:52     ` Fuad Tabba
2021-08-02 14:52     ` Fuad Tabba
2021-08-03 10:24     ` Quentin Perret [this message]
2021-08-03 10:24       ` Quentin Perret
2021-08-03 10:24       ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 17/21] KVM: arm64: Mark host bss and rodata section as shared Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-03  5:02   ` Fuad Tabba
2021-08-03  5:02     ` Fuad Tabba
2021-08-03  5:02     ` Fuad Tabba
2021-08-03 10:34     ` Quentin Perret
2021-08-03 10:34       ` Quentin Perret
2021-08-03 10:34       ` Quentin Perret
2021-08-03 10:54       ` Fuad Tabba
2021-08-03 10:54         ` Fuad Tabba
2021-08-03 10:54         ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 18/21] KVM: arm64: Remove __pkvm_mark_hyp Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 19/21] KVM: arm64: Refactor protected nVHE stage-1 locking Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-03  5:31   ` Fuad Tabba
2021-08-03  5:31     ` Fuad Tabba
2021-08-03  5:31     ` Fuad Tabba
2021-08-03 10:37     ` Quentin Perret
2021-08-03 10:37       ` Quentin Perret
2021-08-03 10:37       ` Quentin Perret
2021-08-03 10:51       ` Fuad Tabba
2021-08-03 10:51         ` Fuad Tabba
2021-08-03 10:51         ` Fuad Tabba
2021-07-29 13:28 ` [PATCH v3 20/21] KVM: arm64: Restrict EL2 stage-1 changes in protected mode Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-08-03  8:22   ` Fuad Tabba
2021-08-03  8:22     ` Fuad Tabba
2021-08-03  8:22     ` Fuad Tabba
2021-08-03 10:43     ` Quentin Perret
2021-08-03 10:43       ` Quentin Perret
2021-08-03 10:43       ` Quentin Perret
2021-07-29 13:28 ` [PATCH v3 21/21] KVM: arm64: Make __pkvm_create_mappings static Quentin Perret
2021-07-29 13:28   ` Quentin Perret
2021-07-29 13:28   ` Quentin Perret

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