From: Fuad Tabba <tabba@google.com>
To: Quentin Perret <qperret@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 11/14] KVM: arm64: Expose kvm_pte_valid() helper
Date: Wed, 21 Jul 2021 09:20:39 +0100 [thread overview]
Message-ID: <CA+EHjTwGCZY8CzM_zBQ6yWCTVu_B-GZFvvHPBUqRW-jr4LDE2A@mail.gmail.com> (raw)
In-Reply-To: <20210719104735.3681732-12-qperret@google.com>
Hi Quentin,
On Mon, Jul 19, 2021 at 11:48 AM Quentin Perret <qperret@google.com> wrote:
>
> The KVM pgtable API exposes the kvm_pgtable_walk() function to allow
> the definition of walkers outside of pgtable.c. However, it is not easy
> to implement any of those walkers without some of the low-level helpers,
> such as kvm_pte_valid(). Make it static inline, and move it to the
> header file to allow its re-use in other places.
>
> Signed-off-by: Quentin Perret <qperret@google.com>
> ---
> arch/arm64/include/asm/kvm_pgtable.h | 7 +++++++
> arch/arm64/kvm/hyp/pgtable.c | 6 ------
> 2 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/include/asm/kvm_pgtable.h b/arch/arm64/include/asm/kvm_pgtable.h
> index 1aa49d6aabb7..8240c881ae1e 100644
> --- a/arch/arm64/include/asm/kvm_pgtable.h
> +++ b/arch/arm64/include/asm/kvm_pgtable.h
> @@ -25,6 +25,13 @@ static inline u64 kvm_get_parange(u64 mmfr0)
>
> typedef u64 kvm_pte_t;
>
> +#define KVM_PTE_VALID BIT(0)
> +
I don't know if there's a better solution for this, but having the
KVM_PTE_VALID by itself here, with the rest remaining in pgtable.c
might be confusing. I see that you probably don't want to move them
all here because they are internal to pgtable.c.
Thanks,
/fuad
> +static inline bool kvm_pte_valid(kvm_pte_t pte)
> +{
> + return pte & KVM_PTE_VALID;
> +}
> +
> /**
> * struct kvm_pgtable_mm_ops - Memory management callbacks.
> * @zalloc_page: Allocate a single zeroed memory page.
> diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> index c7120797404a..e0ae57dca827 100644
> --- a/arch/arm64/kvm/hyp/pgtable.c
> +++ b/arch/arm64/kvm/hyp/pgtable.c
> @@ -11,7 +11,6 @@
> #include <asm/kvm_pgtable.h>
> #include <asm/stage2_pgtable.h>
>
> -#define KVM_PTE_VALID BIT(0)
>
> #define KVM_PTE_TYPE BIT(1)
> #define KVM_PTE_TYPE_BLOCK 0
> @@ -135,11 +134,6 @@ static u32 kvm_pgd_pages(u32 ia_bits, u32 start_level)
> return __kvm_pgd_page_idx(&pgt, -1ULL) + 1;
> }
>
> -static bool kvm_pte_valid(kvm_pte_t pte)
> -{
> - return pte & KVM_PTE_VALID;
> -}
> -
> static bool kvm_pte_table(kvm_pte_t pte, u32 level)
> {
> if (level == KVM_PGTABLE_MAX_LEVELS - 1)
> --
> 2.32.0.402.g57bb445576-goog
>
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next prev parent reply other threads:[~2021-07-21 8:22 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-19 10:47 [PATCH 00/14] Track shared pages at EL2 in protected mode Quentin Perret
2021-07-19 10:47 ` [PATCH 01/14] KVM: arm64: Provide the host_stage2_try() helper macro Quentin Perret
2021-07-20 13:57 ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 02/14] KVM: arm64: Optimize kvm_pgtable_stage2_find_range() Quentin Perret
2021-07-19 10:47 ` [PATCH 03/14] KVM: arm64: Continue stage-2 map when re-creating mappings Quentin Perret
2021-07-19 12:14 ` Marc Zyngier
2021-07-19 13:32 ` Quentin Perret
2021-07-20 8:26 ` Marc Zyngier
2021-07-20 11:56 ` Quentin Perret
2021-07-19 10:47 ` [PATCH 04/14] KVM: arm64: Rename KVM_PTE_LEAF_ATTR_S2_IGNORED Quentin Perret
2021-07-19 10:47 ` [PATCH 05/14] KVM: arm64: Don't overwrite ignored bits with owner id Quentin Perret
2021-07-19 12:55 ` Marc Zyngier
2021-07-19 13:39 ` Quentin Perret
2021-07-20 8:46 ` Marc Zyngier
2021-07-19 10:47 ` [PATCH 06/14] KVM: arm64: Tolerate re-creating hyp mappings to set ignored bits Quentin Perret
2021-07-20 10:17 ` Fuad Tabba
2021-07-20 10:30 ` Quentin Perret
2021-07-20 10:59 ` Fuad Tabba
2021-07-20 11:14 ` Quentin Perret
2021-07-19 10:47 ` [PATCH 07/14] KVM: arm64: Enable forcing page-level stage-2 mappings Quentin Perret
2021-07-19 14:24 ` Marc Zyngier
2021-07-19 15:36 ` Quentin Perret
2021-07-19 10:47 ` [PATCH 08/14] KVM: arm64: Add support for tagging shared pages in page-table Quentin Perret
2021-07-19 14:43 ` Marc Zyngier
2021-07-19 15:49 ` Quentin Perret
2021-07-20 10:13 ` Marc Zyngier
2021-07-20 11:48 ` Quentin Perret
2021-07-20 13:48 ` Fuad Tabba
2021-07-20 14:06 ` Quentin Perret
2021-07-21 7:34 ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 09/14] KVM: arm64: Mark host bss and rodata section as shared Quentin Perret
2021-07-19 15:01 ` Marc Zyngier
2021-07-19 15:56 ` Quentin Perret
2021-07-19 10:47 ` [PATCH 10/14] KVM: arm64: Enable retrieving protections attributes of PTEs Quentin Perret
2021-07-19 10:47 ` [PATCH 11/14] KVM: arm64: Expose kvm_pte_valid() helper Quentin Perret
2021-07-21 8:20 ` Fuad Tabba [this message]
2021-07-19 10:47 ` [PATCH 12/14] KVM: arm64: Refactor pkvm_pgtable locking Quentin Perret
2021-07-21 8:37 ` Fuad Tabba
2021-07-19 10:47 ` [PATCH 13/14] KVM: arm64: Restrict hyp stage-1 manipulation in protected mode Quentin Perret
2021-07-21 10:45 ` Fuad Tabba
2021-07-21 13:35 ` Quentin Perret
2021-07-19 10:47 ` [PATCH 14/14] KVM: arm64: Prevent late calls to __pkvm_create_private_mapping() Quentin Perret
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