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From: Steven Price <steven.price@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: kvm@vger.kernel.org, Catalin Marinas <catalin.marinas@arm.com>,
	linux-doc@vger.kernel.org, Russell King <linux@armlinux.org.uk>,
	linux-kernel@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>,
	Will Deacon <will@kernel.org>,
	kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 3/9] KVM: arm64: Implement PV_FEATURES call
Date: Mon, 5 Aug 2019 14:14:08 +0100
Message-ID: <1e0a03b4-1fb6-cbe2-fb7a-8ed39341a187@arm.com> (raw)
In-Reply-To: <20190803122124.7700f700@why>

On 03/08/2019 12:21, Marc Zyngier wrote:
> On Fri,  2 Aug 2019 15:50:11 +0100
> Steven Price <steven.price@arm.com> wrote:
> 
>> This provides a mechanism for querying which paravirtualized features
>> are available in this hypervisor.
>>
>> Also add the header file which defines the ABI for the paravirtualized
>> clock features we're about to add.
>>
>> Signed-off-by: Steven Price <steven.price@arm.com>
>> ---
>>  arch/arm64/include/asm/pvclock-abi.h | 20 ++++++++++++++++++++
>>  include/linux/arm-smccc.h            | 14 ++++++++++++++
>>  virt/kvm/arm/hypercalls.c            |  9 +++++++++
>>  3 files changed, 43 insertions(+)
>>  create mode 100644 arch/arm64/include/asm/pvclock-abi.h
>>
>> diff --git a/arch/arm64/include/asm/pvclock-abi.h b/arch/arm64/include/asm/pvclock-abi.h
>> new file mode 100644
>> index 000000000000..1f7cdc102691
>> --- /dev/null
>> +++ b/arch/arm64/include/asm/pvclock-abi.h
>> @@ -0,0 +1,20 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (C) 2019 Arm Ltd. */
>> +
>> +#ifndef __ASM_PVCLOCK_ABI_H
>> +#define __ASM_PVCLOCK_ABI_H
>> +
>> +/* The below structures and constants are defined in ARM DEN0057A */
>> +
>> +struct pvclock_vcpu_stolen_time_info {
>> +	__le32 revision;
>> +	__le32 attributes;
>> +	__le64 stolen_time;
>> +	/* Structure must be 64 byte aligned, pad to that size */
>> +	u8 padding[48];
>> +} __packed;
>> +
>> +#define PV_VM_TIME_NOT_SUPPORTED	-1
> 
> Isn't the intent for this to be the same value as
> SMCCC_RET_NOT_SUPPORTED?

Yes it is, I guess there's not much point defining it again.

>> +#define PV_VM_TIME_INVALID_PARAMETERS	-2
> 
> It overlaps with SMCCC_RET_NOT_REQUIRED. Is that a problem? Should we
> consider a spec change for this?

Actually INVALID_PARAMETERS is only for Live Physical Time, since we're
not implementing it here, this can go as well.

Thanks,

Steve
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  reply index

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-02 14:50 [PATCH 0/9] arm64: Stolen time support Steven Price
2019-08-02 14:50 ` [PATCH 1/9] KVM: arm64: Document PV-time interface Steven Price
2019-08-03 11:13   ` Marc Zyngier
2019-08-05 13:06     ` Steven Price
2019-08-05  3:23   ` Zenghui Yu
2019-08-05 13:06     ` Steven Price
2019-08-05 16:40   ` Christophe de Dinechin
2019-08-07 13:21     ` Steven Price
2019-08-07 14:28       ` Christophe de Dinechin
2019-08-07 15:26         ` Steven Price
2019-08-02 14:50 ` [PATCH 2/9] KVM: arm/arm64: Factor out hypercall handling from PSCI code Steven Price
2019-08-02 14:50 ` [PATCH 3/9] KVM: arm64: Implement PV_FEATURES call Steven Price
2019-08-03 11:21   ` Marc Zyngier
2019-08-05 13:14     ` Steven Price [this message]
2019-08-02 14:50 ` [PATCH 4/9] KVM: arm64: Support stolen time reporting via shared structure Steven Price
2019-08-03 11:55   ` Marc Zyngier
2019-08-05 14:09     ` Steven Price
2019-08-03 17:58   ` Marc Zyngier
2019-08-03 18:13     ` Marc Zyngier
2019-08-05 14:18       ` Steven Price
2019-08-02 14:50 ` [PATCH 5/9] KVM: Allow kvm_device_ops to be const Steven Price
2019-08-02 14:50 ` [PATCH 6/9] KVM: arm64: Provide a PV_TIME device to user space Steven Price
2019-08-03 12:51   ` Marc Zyngier
2019-08-03 17:34     ` Marc Zyngier
2019-08-07 13:39       ` Steven Price
2019-08-07 13:51         ` Marc Zyngier
2019-08-05 16:10     ` Steven Price
2019-08-05 16:28       ` Marc Zyngier
2019-08-02 14:50 ` [PATCH 7/9] arm/arm64: Provide a wrapper for SMCCC 1.1 calls Steven Price
2019-08-05 10:03   ` Will Deacon
2019-08-02 14:50 ` [PATCH 8/9] arm/arm64: Make use of the SMCCC 1.1 wrapper Steven Price
2019-08-02 14:50 ` [PATCH 9/9] arm64: Retrieve stolen time as paravirtualized guest Steven Price
2019-08-04  9:53   ` Marc Zyngier
2019-08-08 15:29     ` Steven Price
2019-08-08 15:49       ` Marc Zyngier
2019-08-09 13:51   ` Zenghui Yu
2019-08-12 10:39     ` Steven Price
2019-08-13  6:06       ` Zenghui Yu
2019-08-03 18:05 ` [PATCH 0/9] arm64: Stolen time support Marc Zyngier
2019-08-05 13:06   ` Steven Price
2019-08-05 13:26     ` Marc Zyngier
2019-08-14 13:02     ` Alexander Graf
2019-08-14 14:19       ` Marc Zyngier
2019-08-14 14:52         ` [UNVERIFIED SENDER] " Alexander Graf
2019-08-16 10:23           ` Steven Price

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