From: David Brazdil <dbrazdil@google.com>
To: Quentin Perret <qperret@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Rob Herring <robh+dt@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
"moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)"
<linux-arm-kernel@lists.infradead.org>,
open list <linux-kernel@vger.kernel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR ARM64 (KVM/arm64)"
<kvmarm@lists.cs.columbia.edu>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE"
<devicetree@vger.kernel.org>,
kernel-team@android.com, android-kvm@google.com
Subject: Re: [RFC PATCH 13/27] KVM: arm64: Enable access to sanitized CPU features at EL2
Date: Mon, 23 Nov 2020 13:22:23 +0000 [thread overview]
Message-ID: <20201123132223.oohevce4izuoaqi3@google.com> (raw)
In-Reply-To: <20201117181607.1761516-14-qperret@google.com>
> +int copy_ftr_reg(u32 id, struct arm64_ftr_reg *dst)
> +{
> + struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id);
> +
> + if (!regp)
> + return -EINVAL;
> +
> + memcpy(dst, regp, sizeof(*regp));
> +
> + return 0;
> +}
> +
> #define read_sysreg_case(r) \
> case r: return read_sysreg_s(r)
>
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index dd8ccc9efb6a..c35d768672eb 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -116,6 +116,8 @@ __kvm_nvhe___memcpy = __kvm_nvhe___pi_memcpy;
> __kvm_nvhe___memset = __kvm_nvhe___pi_memset;
> #endif
>
> +_kvm_nvhe___flush_dcache_area = __kvm_nvhe___pi___flush_dcache_area;
> +
Could you help my understand why we need this?
* Why do we need PI routines in the first place? Would my series that fixes
relocations in hyp code remove the need?
* You added these aliases for the string routines because you were worried
somebody would change the implementation in arch/arm64/lib, right? But this
cache flush function is defined in hyp/nvhe. So why do we need to point to
the PI alias if we control the implementation?
WARNING: multiple messages have this Message-ID (diff)
From: David Brazdil <dbrazdil@google.com>
To: Quentin Perret <qperret@google.com>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE"
<devicetree@vger.kernel.org>,
kernel-team@android.com, Frank Rowand <frowand.list@gmail.com>,
android-kvm@google.com, Catalin Marinas <catalin.marinas@arm.com>,
open list <linux-kernel@vger.kernel.org>,
Rob Herring <robh+dt@kernel.org>,
"moderated list:ARM64 PORT \(AARCH64 ARCHITECTURE\)"
<linux-arm-kernel@lists.infradead.org>,
Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)"
<kvmarm@lists.cs.columbia.edu>
Subject: Re: [RFC PATCH 13/27] KVM: arm64: Enable access to sanitized CPU features at EL2
Date: Mon, 23 Nov 2020 13:22:23 +0000 [thread overview]
Message-ID: <20201123132223.oohevce4izuoaqi3@google.com> (raw)
In-Reply-To: <20201117181607.1761516-14-qperret@google.com>
> +int copy_ftr_reg(u32 id, struct arm64_ftr_reg *dst)
> +{
> + struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id);
> +
> + if (!regp)
> + return -EINVAL;
> +
> + memcpy(dst, regp, sizeof(*regp));
> +
> + return 0;
> +}
> +
> #define read_sysreg_case(r) \
> case r: return read_sysreg_s(r)
>
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index dd8ccc9efb6a..c35d768672eb 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -116,6 +116,8 @@ __kvm_nvhe___memcpy = __kvm_nvhe___pi_memcpy;
> __kvm_nvhe___memset = __kvm_nvhe___pi_memset;
> #endif
>
> +_kvm_nvhe___flush_dcache_area = __kvm_nvhe___pi___flush_dcache_area;
> +
Could you help my understand why we need this?
* Why do we need PI routines in the first place? Would my series that fixes
relocations in hyp code remove the need?
* You added these aliases for the string routines because you were worried
somebody would change the implementation in arch/arm64/lib, right? But this
cache flush function is defined in hyp/nvhe. So why do we need to point to
the PI alias if we control the implementation?
_______________________________________________
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: David Brazdil <dbrazdil@google.com>
To: Quentin Perret <qperret@google.com>
Cc: "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE"
<devicetree@vger.kernel.org>,
kernel-team@android.com, Frank Rowand <frowand.list@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
android-kvm@google.com, Catalin Marinas <catalin.marinas@arm.com>,
open list <linux-kernel@vger.kernel.org>,
Rob Herring <robh+dt@kernel.org>,
James Morse <james.morse@arm.com>,
"moderated list:ARM64 PORT \(AARCH64 ARCHITECTURE\)"
<linux-arm-kernel@lists.infradead.org>,
Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR ARM64 \(KVM/arm64\)"
<kvmarm@lists.cs.columbia.edu>,
Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [RFC PATCH 13/27] KVM: arm64: Enable access to sanitized CPU features at EL2
Date: Mon, 23 Nov 2020 13:22:23 +0000 [thread overview]
Message-ID: <20201123132223.oohevce4izuoaqi3@google.com> (raw)
In-Reply-To: <20201117181607.1761516-14-qperret@google.com>
> +int copy_ftr_reg(u32 id, struct arm64_ftr_reg *dst)
> +{
> + struct arm64_ftr_reg *regp = get_arm64_ftr_reg(id);
> +
> + if (!regp)
> + return -EINVAL;
> +
> + memcpy(dst, regp, sizeof(*regp));
> +
> + return 0;
> +}
> +
> #define read_sysreg_case(r) \
> case r: return read_sysreg_s(r)
>
> diff --git a/arch/arm64/kernel/image-vars.h b/arch/arm64/kernel/image-vars.h
> index dd8ccc9efb6a..c35d768672eb 100644
> --- a/arch/arm64/kernel/image-vars.h
> +++ b/arch/arm64/kernel/image-vars.h
> @@ -116,6 +116,8 @@ __kvm_nvhe___memcpy = __kvm_nvhe___pi_memcpy;
> __kvm_nvhe___memset = __kvm_nvhe___pi_memset;
> #endif
>
> +_kvm_nvhe___flush_dcache_area = __kvm_nvhe___pi___flush_dcache_area;
> +
Could you help my understand why we need this?
* Why do we need PI routines in the first place? Would my series that fixes
relocations in hyp code remove the need?
* You added these aliases for the string routines because you were worried
somebody would change the implementation in arch/arm64/lib, right? But this
cache flush function is defined in hyp/nvhe. So why do we need to point to
the PI alias if we control the implementation?
_______________________________________________
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:[~2020-11-23 13:22 UTC|newest]
Thread overview: 162+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 18:15 [RFC PATCH 00/27] KVM/arm64: A stage 2 for the host Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 01/27] arm64: lib: Annotate {clear,copy}_page() as position-independent Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 01/27] arm64: lib: Annotate {clear, copy}_page() " Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 02/27] KVM: arm64: Link position-independent string routines into .hyp.text Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-23 12:34 ` David Brazdil
2020-11-23 12:34 ` David Brazdil
2020-11-23 12:34 ` David Brazdil
2020-11-23 14:06 ` Quentin Perret
2020-11-23 14:06 ` Quentin Perret
2020-11-23 14:06 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 03/27] KVM: arm64: Add standalone ticket spinlock implementation for use at hyp Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 04/27] KVM: arm64: Initialize kvm_nvhe_init_params early Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 05/27] KVM: arm64: Avoid free_page() in page-table allocator Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 06/27] KVM: arm64: Factor memory allocation out of pgtable.c Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 07/27] KVM: arm64: Introduce a BSS section for use at Hyp Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 08/27] KVM: arm64: Make kvm_call_hyp() a function call " Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-23 12:51 ` David Brazdil
2020-11-23 12:51 ` David Brazdil
2020-11-23 12:51 ` David Brazdil
2020-11-17 18:15 ` [RFC PATCH 09/27] KVM: arm64: Allow using kvm_nvhe_sym() in hyp code Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-23 12:57 ` David Brazdil
2020-11-23 12:57 ` David Brazdil
2020-11-23 12:57 ` David Brazdil
2020-11-23 14:02 ` Quentin Perret
2020-11-23 14:02 ` Quentin Perret
2020-11-23 14:02 ` Quentin Perret
2020-11-23 14:54 ` David Brazdil
2020-11-23 14:54 ` David Brazdil
2020-11-23 14:54 ` David Brazdil
2020-11-17 18:15 ` [RFC PATCH 10/27] KVM: arm64: Introduce an early Hyp page allocator Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 11/27] KVM: arm64: Stub CONFIG_DEBUG_LIST at Hyp Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 12/27] KVM: arm64: Introduce a Hyp buddy page allocator Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 13/27] KVM: arm64: Enable access to sanitized CPU features at EL2 Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-23 10:55 ` Fuad Tabba
2020-11-23 10:55 ` Fuad Tabba
2020-11-23 10:55 ` Fuad Tabba
2020-11-23 13:51 ` Quentin Perret
2020-11-23 13:51 ` Quentin Perret
2020-11-23 13:51 ` Quentin Perret
2020-11-23 13:22 ` David Brazdil [this message]
2020-11-23 13:22 ` David Brazdil
2020-11-23 13:22 ` David Brazdil
2020-11-23 14:39 ` Quentin Perret
2020-11-23 14:39 ` Quentin Perret
2020-11-23 14:39 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 14/27] KVM: arm64: Factor out vector address calculation Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 15/27] of/fdt: Introduce early_init_dt_add_memory_hyp() Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 19:44 ` Rob Herring
2020-11-17 19:44 ` Rob Herring
2020-11-17 19:44 ` Rob Herring
2020-11-18 9:25 ` Quentin Perret
2020-11-18 9:25 ` Quentin Perret
2020-11-18 9:25 ` Quentin Perret
2020-11-18 14:31 ` Quentin Perret
2020-11-18 14:31 ` Quentin Perret
2020-11-18 14:31 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 16/27] KVM: arm64: Prepare Hyp memory protection Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-12-03 12:57 ` Fuad Tabba
2020-12-03 12:57 ` Fuad Tabba
2020-12-03 12:57 ` Fuad Tabba
2020-12-04 18:01 ` Quentin Perret
2020-12-04 18:01 ` Quentin Perret
2020-12-04 18:01 ` Quentin Perret
2020-12-07 10:20 ` Will Deacon
2020-12-07 10:20 ` Will Deacon
2020-12-07 10:20 ` Will Deacon
2020-12-07 11:05 ` Mark Rutland
2020-12-07 11:05 ` Mark Rutland
2020-12-07 11:05 ` Mark Rutland
2020-12-07 11:10 ` Will Deacon
2020-12-07 11:10 ` Will Deacon
2020-12-07 11:10 ` Will Deacon
2020-12-07 11:14 ` Fuad Tabba
2020-12-07 11:14 ` Fuad Tabba
2020-12-07 11:14 ` Fuad Tabba
2020-12-07 11:16 ` Fuad Tabba
2020-12-07 11:16 ` Fuad Tabba
2020-12-07 11:16 ` Fuad Tabba
2020-12-07 11:58 ` Quentin Perret
2020-12-07 11:58 ` Quentin Perret
2020-12-07 11:58 ` Quentin Perret
2020-12-07 13:54 ` Marc Zyngier
2020-12-07 13:54 ` Marc Zyngier
2020-12-07 13:54 ` Marc Zyngier
2020-12-07 14:17 ` Quentin Perret
2020-12-07 14:17 ` Quentin Perret
2020-12-07 14:17 ` Quentin Perret
2020-12-07 13:40 ` Will Deacon
2020-12-07 13:40 ` Will Deacon
2020-12-07 13:40 ` Will Deacon
2020-12-07 14:11 ` Quentin Perret
2020-12-07 14:11 ` Quentin Perret
2020-12-07 14:11 ` Quentin Perret
2020-12-08 9:40 ` Will Deacon
2020-12-08 9:40 ` Will Deacon
2020-12-08 9:40 ` Will Deacon
2020-11-17 18:15 ` [RFC PATCH 17/27] KVM: arm64: Elevate Hyp mappings creation at EL2 Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 18/27] KVM: arm64: Use kvm_arch for stage 2 pgtable Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` [RFC PATCH 19/27] KVM: arm64: Use kvm_arch in kvm_s2_mmu Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:15 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 20/27] KVM: arm64: Set host stage 2 using kvm_nvhe_init_params Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 21/27] KVM: arm64: Refactor kvm_arm_setup_stage2() Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 22/27] KVM: arm64: Refactor __load_guest_stage2() Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 23/27] KVM: arm64: Refactor __populate_fault_info() Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 24/27] KVM: arm64: Make memcache anonymous in pgtable allocator Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 25/27] KVM: arm64: Reserve memory for host stage 2 Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 26/27] KVM: arm64: Sort the memblock regions list Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` [RFC PATCH 27/27] KVM: arm64: Wrap the host with a stage 2 Quentin Perret
2020-11-17 18:16 ` Quentin Perret
2020-11-17 18:16 ` Quentin Perret
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