From: Marc Zyngier <maz@kernel.org>
To: James Morse <james.morse@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
Andre Przywara <andre.przywara@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
Jintack Lim <jintack@cs.columbia.edu>,
Alexandru Elisei <alexandru.elisei@arm.com>,
George Cherian <gcherian@marvell.com>,
"Zengtao (B)" <prime.zeng@hisilicon.com>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: Re: [PATCH 19/26] KVM: arm64: Make struct kvm_regs userspace-only
Date: Wed, 27 May 2020 11:22:57 +0100 [thread overview]
Message-ID: <8f1665abb0bd6f018cb8af53ec203b76@kernel.org> (raw)
In-Reply-To: <0a38305f-77f8-11b0-cb74-2bec07ce0a0a@arm.com>
On 2020-05-26 17:29, James Morse wrote:
> Hi Marc,
>
> On 22/04/2020 13:00, Marc Zyngier wrote:
>> struct kvm_regs is used by userspace to indicate which register gets
>> accessed by the {GET,SET}_ONE_REG API. But as we're about to refactor
>> the layout of the in-kernel register structures, we need the kernel to
>> move away from it.
>>
>> Let's make kvm_regs userspace only, and let the kernel map it to its
>> own
>> internal representation.
>
>> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
>> index 23ebe51410f06..9fec9231b63e2 100644
>> --- a/arch/arm64/kvm/guest.c
>> +++ b/arch/arm64/kvm/guest.c
>> @@ -102,6 +102,55 @@ static int core_reg_size_from_offset(const struct
>> kvm_vcpu *vcpu, u64 off)
>> return size;
>> }
>>
>> +static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct
>> kvm_one_reg *reg)
>> +{
>> + u64 off = core_reg_offset_from_id(reg->id);
>> +
>> + switch (off) {
>
>> + default:
>> + return NULL;
>
> Doesn't this switch statement catch an out of range offset, and a
> misaligned offset?
>
> ... We still test for those explicitly in the caller. Better safe than
> implicit?
Indeed, this is not supposed to happen at all. Maybe I should just fold
validate_core_offset offset there, and make this NULL value the error
case.
>
>> + }
>> +}
>
> With the reset thing reported by Zenghui and Zengtao on the previous
> patch fixed:
> Reviewed-by: James Morse <james.morse@arm.com>
>
> (otherwise struct kvm_regs isn't userspace-only!)
Indeed!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: James Morse <james.morse@arm.com>
Cc: kvm@vger.kernel.org, Andre Przywara <andre.przywara@arm.com>,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
George Cherian <gcherian@marvell.com>,
"Zengtao \(B\)" <prime.zeng@hisilicon.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 19/26] KVM: arm64: Make struct kvm_regs userspace-only
Date: Wed, 27 May 2020 11:22:57 +0100 [thread overview]
Message-ID: <8f1665abb0bd6f018cb8af53ec203b76@kernel.org> (raw)
In-Reply-To: <0a38305f-77f8-11b0-cb74-2bec07ce0a0a@arm.com>
On 2020-05-26 17:29, James Morse wrote:
> Hi Marc,
>
> On 22/04/2020 13:00, Marc Zyngier wrote:
>> struct kvm_regs is used by userspace to indicate which register gets
>> accessed by the {GET,SET}_ONE_REG API. But as we're about to refactor
>> the layout of the in-kernel register structures, we need the kernel to
>> move away from it.
>>
>> Let's make kvm_regs userspace only, and let the kernel map it to its
>> own
>> internal representation.
>
>> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
>> index 23ebe51410f06..9fec9231b63e2 100644
>> --- a/arch/arm64/kvm/guest.c
>> +++ b/arch/arm64/kvm/guest.c
>> @@ -102,6 +102,55 @@ static int core_reg_size_from_offset(const struct
>> kvm_vcpu *vcpu, u64 off)
>> return size;
>> }
>>
>> +static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct
>> kvm_one_reg *reg)
>> +{
>> + u64 off = core_reg_offset_from_id(reg->id);
>> +
>> + switch (off) {
>
>> + default:
>> + return NULL;
>
> Doesn't this switch statement catch an out of range offset, and a
> misaligned offset?
>
> ... We still test for those explicitly in the caller. Better safe than
> implicit?
Indeed, this is not supposed to happen at all. Maybe I should just fold
validate_core_offset offset there, and make this NULL value the error
case.
>
>> + }
>> +}
>
> With the reset thing reported by Zenghui and Zengtao on the previous
> patch fixed:
> Reviewed-by: James Morse <james.morse@arm.com>
>
> (otherwise struct kvm_regs isn't userspace-only!)
Indeed!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
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: Marc Zyngier <maz@kernel.org>
To: James Morse <james.morse@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
kvm@vger.kernel.org, Suzuki K Poulose <suzuki.poulose@arm.com>,
Jintack Lim <jintack@cs.columbia.edu>,
Andre Przywara <andre.przywara@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
kvmarm@lists.cs.columbia.edu, Will Deacon <will@kernel.org>,
George Cherian <gcherian@marvell.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
"Zengtao \(B\)" <prime.zeng@hisilicon.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Dave Martin <Dave.Martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 19/26] KVM: arm64: Make struct kvm_regs userspace-only
Date: Wed, 27 May 2020 11:22:57 +0100 [thread overview]
Message-ID: <8f1665abb0bd6f018cb8af53ec203b76@kernel.org> (raw)
In-Reply-To: <0a38305f-77f8-11b0-cb74-2bec07ce0a0a@arm.com>
On 2020-05-26 17:29, James Morse wrote:
> Hi Marc,
>
> On 22/04/2020 13:00, Marc Zyngier wrote:
>> struct kvm_regs is used by userspace to indicate which register gets
>> accessed by the {GET,SET}_ONE_REG API. But as we're about to refactor
>> the layout of the in-kernel register structures, we need the kernel to
>> move away from it.
>>
>> Let's make kvm_regs userspace only, and let the kernel map it to its
>> own
>> internal representation.
>
>> diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
>> index 23ebe51410f06..9fec9231b63e2 100644
>> --- a/arch/arm64/kvm/guest.c
>> +++ b/arch/arm64/kvm/guest.c
>> @@ -102,6 +102,55 @@ static int core_reg_size_from_offset(const struct
>> kvm_vcpu *vcpu, u64 off)
>> return size;
>> }
>>
>> +static void *core_reg_addr(struct kvm_vcpu *vcpu, const struct
>> kvm_one_reg *reg)
>> +{
>> + u64 off = core_reg_offset_from_id(reg->id);
>> +
>> + switch (off) {
>
>> + default:
>> + return NULL;
>
> Doesn't this switch statement catch an out of range offset, and a
> misaligned offset?
>
> ... We still test for those explicitly in the caller. Better safe than
> implicit?
Indeed, this is not supposed to happen at all. Maybe I should just fold
validate_core_offset offset there, and make this NULL value the error
case.
>
>> + }
>> +}
>
> With the reset thing reported by Zenghui and Zengtao on the previous
> patch fixed:
> Reviewed-by: James Morse <james.morse@arm.com>
>
> (otherwise struct kvm_regs isn't userspace-only!)
Indeed!
Thanks,
M.
--
Jazz is not dead. It just smells funny...
_______________________________________________
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:[~2020-05-27 10:23 UTC|newest]
Thread overview: 234+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-22 12:00 [PATCH 00/26] KVM: arm64: Preliminary NV patches Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 01/26] KVM: arm64: Check advertised Stage-2 page size capability Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 13:40 ` Suzuki K Poulose
2020-04-22 13:40 ` Suzuki K Poulose
2020-04-22 13:40 ` Suzuki K Poulose
2020-04-22 14:07 ` Marc Zyngier
2020-04-22 14:07 ` Marc Zyngier
2020-04-22 14:07 ` Marc Zyngier
2020-04-22 14:14 ` Suzuki K Poulose
2020-04-22 14:14 ` Suzuki K Poulose
2020-04-22 14:14 ` Suzuki K Poulose
2020-05-07 11:42 ` Alexandru Elisei
2020-05-07 11:42 ` Alexandru Elisei
2020-05-07 11:42 ` Alexandru Elisei
2020-04-22 12:00 ` [PATCH 02/26] KVM: arm64: Move __load_guest_stage2 to kvm_mmu.h Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 13:51 ` Suzuki K Poulose
2020-04-22 13:51 ` Suzuki K Poulose
2020-04-22 13:51 ` Suzuki K Poulose
2020-04-22 13:59 ` Marc Zyngier
2020-04-22 13:59 ` Marc Zyngier
2020-04-22 13:59 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 03/26] KVM: arm64: Factor out stage 2 page table data from struct kvm Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-05 15:26 ` Andrew Scull
2020-05-05 15:26 ` Andrew Scull
2020-05-05 15:26 ` Andrew Scull
2020-05-05 16:32 ` Marc Zyngier
2020-05-05 16:32 ` Marc Zyngier
2020-05-05 16:32 ` Marc Zyngier
2020-05-05 17:23 ` Andrew Scull
2020-05-05 17:23 ` Andrew Scull
2020-05-05 17:23 ` Andrew Scull
2020-05-05 18:10 ` Marc Zyngier
2020-05-05 18:10 ` Marc Zyngier
2020-05-05 18:10 ` Marc Zyngier
2020-05-05 16:03 ` James Morse
2020-05-05 16:03 ` James Morse
2020-05-05 16:03 ` James Morse
2020-05-05 17:59 ` Marc Zyngier
2020-05-05 17:59 ` Marc Zyngier
2020-05-05 17:59 ` Marc Zyngier
2020-05-06 9:30 ` Marc Zyngier
2020-05-06 9:30 ` Marc Zyngier
2020-05-06 9:30 ` Marc Zyngier
2020-05-11 16:38 ` Alexandru Elisei
2020-05-11 16:38 ` Alexandru Elisei
2020-05-11 16:38 ` Alexandru Elisei
2020-05-12 11:17 ` James Morse
2020-05-12 11:17 ` James Morse
2020-05-12 11:17 ` James Morse
2020-05-12 15:47 ` Alexandru Elisei
2020-05-12 15:47 ` Alexandru Elisei
2020-05-12 15:47 ` Alexandru Elisei
2020-05-12 16:13 ` James Morse
2020-05-12 16:13 ` James Morse
2020-05-12 16:13 ` James Morse
2020-05-12 16:53 ` Alexandru Elisei
2020-05-12 16:53 ` Alexandru Elisei
2020-05-12 16:53 ` Alexandru Elisei
2020-05-27 8:41 ` Marc Zyngier
2020-05-27 8:41 ` Marc Zyngier
2020-05-27 8:41 ` Marc Zyngier
2020-05-27 8:45 ` Alexandru Elisei
2020-05-27 8:45 ` Alexandru Elisei
2020-05-27 8:45 ` Alexandru Elisei
2020-04-22 12:00 ` [PATCH 04/26] arm64: Detect the ARMv8.4 TTL feature Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-27 15:55 ` Suzuki K Poulose
2020-04-27 15:55 ` Suzuki K Poulose
2020-04-27 15:55 ` Suzuki K Poulose
2020-04-22 12:00 ` [PATCH 05/26] arm64: Document SW reserved PTE/PMD bits in Stage-2 descriptors Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-05 15:59 ` Andrew Scull
2020-05-05 15:59 ` Andrew Scull
2020-05-05 15:59 ` Andrew Scull
2020-05-06 9:39 ` Marc Zyngier
2020-05-06 9:39 ` Marc Zyngier
2020-05-06 9:39 ` Marc Zyngier
2020-05-06 10:11 ` Andrew Scull
2020-05-06 10:11 ` Andrew Scull
2020-05-06 10:11 ` Andrew Scull
2020-04-22 12:00 ` [PATCH 06/26] arm64: Add level-hinted TLB invalidation helper Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-05 17:16 ` Andrew Scull
2020-05-05 17:16 ` Andrew Scull
2020-05-05 17:16 ` Andrew Scull
2020-05-06 8:05 ` Marc Zyngier
2020-05-06 8:05 ` Marc Zyngier
2020-05-06 8:05 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 07/26] KVM: arm64: Add a level hint to __kvm_tlb_flush_vmid_ipa Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-07 15:08 ` Andrew Scull
2020-05-07 15:08 ` Andrew Scull
2020-05-07 15:08 ` Andrew Scull
2020-05-07 15:13 ` Marc Zyngier
2020-05-07 15:13 ` Marc Zyngier
2020-05-07 15:13 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 08/26] KVM: arm64: Use TTL hint in when invalidating stage-2 translations Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-07 15:13 ` Andrew Scull
2020-05-07 15:13 ` Andrew Scull
2020-05-07 15:13 ` Andrew Scull
2020-05-12 12:04 ` James Morse
2020-05-12 12:04 ` James Morse
2020-05-12 12:04 ` James Morse
2020-05-13 9:06 ` Andrew Scull
2020-05-13 9:06 ` Andrew Scull
2020-05-13 9:06 ` Andrew Scull
2020-05-27 8:59 ` Marc Zyngier
2020-05-27 8:59 ` Marc Zyngier
2020-05-27 8:59 ` Marc Zyngier
2020-05-12 17:26 ` James Morse
2020-05-12 17:26 ` James Morse
2020-05-12 17:26 ` James Morse
2020-04-22 12:00 ` [PATCH 09/26] KVM: arm64: vgic-v3: Take cpu_if pointer directly instead of vcpu Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-07 16:26 ` James Morse
2020-05-07 16:26 ` James Morse
2020-05-07 16:26 ` James Morse
2020-05-08 12:20 ` Marc Zyngier
2020-05-08 12:20 ` Marc Zyngier
2020-05-08 12:20 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 10/26] KVM: arm64: Refactor vcpu_{read,write}_sys_reg Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:28 ` James Morse
2020-05-26 16:28 ` James Morse
2020-05-26 16:28 ` James Morse
2020-05-27 10:04 ` Marc Zyngier
2020-05-27 10:04 ` Marc Zyngier
2020-05-27 10:04 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 11/26] KVM: arm64: Add missing reset handlers for PMU emulation Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-04-22 12:00 ` [PATCH 12/26] KVM: arm64: Move sysreg reset check to boot time Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 13/26] KVM: arm64: Introduce accessor for ctxt->sys_reg Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 14/26] KVM: arm64: hyp: Use ctxt_sys_reg/__vcpu_sys_reg instead of raw sys_regs access Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 15/26] KVM: arm64: sve: Use __vcpu_sys_reg() " Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 16/26] KVM: arm64: pauth: Use ctxt_sys_reg() " Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 17/26] KVM: arm64: debug: " Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 18/26] KVM: arm64: Don't use empty structures as CPU reset state Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-24 4:07 ` Zenghui Yu
2020-04-24 4:07 ` Zenghui Yu
2020-04-24 4:07 ` Zenghui Yu
2020-04-24 7:45 ` Marc Zyngier
2020-04-24 7:45 ` Marc Zyngier
2020-04-24 7:45 ` Marc Zyngier
2020-04-28 1:34 ` Zengtao (B)
2020-04-28 1:34 ` Zengtao (B)
2020-04-28 1:34 ` Zengtao (B)
2020-04-22 12:00 ` [PATCH 19/26] KVM: arm64: Make struct kvm_regs userspace-only Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-27 10:22 ` Marc Zyngier [this message]
2020-05-27 10:22 ` Marc Zyngier
2020-05-27 10:22 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 20/26] KVM: arm64: Move ELR_EL1 to the system register array Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-27 10:36 ` Marc Zyngier
2020-05-27 10:36 ` Marc Zyngier
2020-05-27 10:36 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 21/26] KVM: arm64: Move SP_EL1 " Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-05-26 16:29 ` James Morse
2020-04-22 12:00 ` [PATCH 22/26] KVM: arm64: Disintegrate SPSR array Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:30 ` James Morse
2020-05-26 16:30 ` James Morse
2020-05-26 16:30 ` James Morse
2020-04-22 12:00 ` [PATCH 23/26] KVM: arm64: Move SPSR_EL1 to the system register array Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-26 16:30 ` James Morse
2020-05-26 16:30 ` James Morse
2020-05-26 16:30 ` James Morse
2020-04-22 12:00 ` [PATCH 24/26] KVM: arm64: timers: Rename kvm_timer_sync_hwstate to kvm_timer_sync_user Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 25/26] KVM: arm64: timers: Move timer registers to the sys_regs file Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` [PATCH 26/26] KVM: arm64: Parametrize exception entry with a target EL Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-04-22 12:00 ` Marc Zyngier
2020-05-19 10:44 ` Mark Rutland
2020-05-19 10:44 ` Mark Rutland
2020-05-19 10:44 ` Mark Rutland
2020-05-27 9:34 ` Marc Zyngier
2020-05-27 9:34 ` Marc Zyngier
2020-05-27 9:34 ` Marc Zyngier
2020-05-27 14:41 ` Mark Rutland
2020-05-27 14:41 ` Mark Rutland
2020-05-27 14:41 ` Mark Rutland
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