From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1C2FECE58A for ; Wed, 2 Oct 2019 14:50:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BFA0F21D82 for ; Wed, 2 Oct 2019 14:50:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728545AbfJBOu4 (ORCPT ); Wed, 2 Oct 2019 10:50:56 -0400 Received: from foss.arm.com ([217.140.110.172]:46200 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726411AbfJBOuz (ORCPT ); Wed, 2 Oct 2019 10:50:55 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3DC1F1597; Wed, 2 Oct 2019 07:50:54 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 37F153F706; Wed, 2 Oct 2019 07:50:52 -0700 (PDT) From: Steven Price To: Marc Zyngier , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Cc: Steven Price , Catalin Marinas , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Russell King , James Morse , Julien Thierry , Suzuki K Pouloze , Mark Rutland , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 01/10] KVM: arm64: Document PV-time interface Date: Wed, 2 Oct 2019 15:50:28 +0100 Message-Id: <20191002145037.51630-2-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191002145037.51630-1-steven.price@arm.com> References: <20191002145037.51630-1-steven.price@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a paravirtualization interface for KVM/arm64 based on the "Arm Paravirtualized Time for Arm-Base Systems" specification DEN 0057A. This only adds the details about "Stolen Time" as the details of "Live Physical Time" have not been fully agreed. User space can specify a reserved area of memory for the guest and inform KVM to populate the memory with information on time that the host kernel has stolen from the guest. A hypercall interface is provided for the guest to interrogate the hypervisor's support for this interface and the location of the shared memory structures. Signed-off-by: Steven Price --- Documentation/virt/kvm/arm/pvtime.txt | 65 +++++++++++++++++++++++++ Documentation/virt/kvm/devices/vcpu.txt | 14 ++++++ 2 files changed, 79 insertions(+) create mode 100644 Documentation/virt/kvm/arm/pvtime.txt diff --git a/Documentation/virt/kvm/arm/pvtime.txt b/Documentation/virt/kvm/arm/pvtime.txt new file mode 100644 index 000000000000..fa15c12eec91 --- /dev/null +++ b/Documentation/virt/kvm/arm/pvtime.txt @@ -0,0 +1,65 @@ +Paravirtualized time support for arm64 +====================================== + +Arm specification DEN0057/A defined a standard for paravirtualised time +support for AArch64 guests: + +https://developer.arm.com/docs/den0057/a + +KVM/arm64 implements the stolen time part of this specification by providing +some hypervisor service calls to support a paravirtualized guest obtaining a +view of the amount of time stolen from its execution. + +Two new SMCCC compatible hypercalls are defined: + +PV_FEATURES 0xC5000020 +PV_TIME_ST 0xC5000022 + +These are only available in the SMC64/HVC64 calling convention as +paravirtualized time is not available to 32 bit Arm guests. The existence of +the PV_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES +mechanism before calling it. + +PV_FEATURES + Function ID: (uint32) : 0xC5000020 + PV_func_id: (uint32) : The function to query for support. + Currently only PV_TIME_ST is supported. + Return value: (int32) : NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant + PV-time feature is supported by the hypervisor. + +PV_TIME_ST + Function ID: (uint32) : 0xC5000022 + Return value: (int64) : IPA of the stolen time data structure for this + VCPU. On failure: + NOT_SUPPORTED (-1) + +The IPA returned by PV_TIME_ST should be mapped by the guest as normal memory +with inner and outer write back caching attributes, in the inner shareable +domain. A total of 16 bytes from the IPA returned are guaranteed to be +meaningfully filled by the hypervisor (see structure below). + +PV_TIME_ST returns the structure for the calling VCPU. + +Stolen Time +----------- + +The structure pointed to by the PV_TIME_ST hypercall is as follows: + + Field | Byte Length | Byte Offset | Description + ----------- | ----------- | ----------- | -------------------------- + Revision | 4 | 0 | Must be 0 for version 0.1 + Attributes | 4 | 4 | Must be 0 + Stolen time | 8 | 8 | Stolen time in unsigned + | | | nanoseconds indicating how + | | | much time this VCPU thread + | | | was involuntarily not + | | | running on a physical CPU. + +The structure will be updated by the hypervisor prior to scheduling a VCPU. It +will be present within a reserved region of the normal memory given to the +guest. The guest should not attempt to write into this memory. There is a +structure per VCPU of the guest. + +For the user space interface see Documentation/virt/kvm/devices/vcpu.txt +section "3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL". + diff --git a/Documentation/virt/kvm/devices/vcpu.txt b/Documentation/virt/kvm/devices/vcpu.txt index 2b5dab16c4f2..6f3bd64a05b0 100644 --- a/Documentation/virt/kvm/devices/vcpu.txt +++ b/Documentation/virt/kvm/devices/vcpu.txt @@ -60,3 +60,17 @@ time to use the number provided for a given timer, overwriting any previously configured values on other VCPUs. Userspace should configure the interrupt numbers on at least one VCPU after creating all VCPUs and before running any VCPUs. + +3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL +Architectures: ARM64 + +3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA +Parameters: 64-bit base address +Returns: -ENXIO: Stolen time not implemented + -EEXIST: Base address already set for this VCPU + -EINVAL: Base address not 64 byte aligned + +Specifies the base address of the stolen time structure for this VCPU. The +base address must be 64 byte aligned and exist within a valid guest memory +region. See Documentation/virt/kvm/arm/pvtime.txt for more information +including the layout of the stolen time structure. -- 2.20.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFD48C352AA for ; Wed, 2 Oct 2019 14:50:58 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id A212C21D80 for ; Wed, 2 Oct 2019 14:50:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A212C21D80 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 5A5824A981; Wed, 2 Oct 2019 10:50:58 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DEMYBfzlt07y; Wed, 2 Oct 2019 10:50:57 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 17D9E4A93C; Wed, 2 Oct 2019 10:50:57 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 09A984A8CE for ; Wed, 2 Oct 2019 10:50:56 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id x01hD5pFwqIZ for ; Wed, 2 Oct 2019 10:50:54 -0400 (EDT) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 9BA774A8BE for ; Wed, 2 Oct 2019 10:50:54 -0400 (EDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3DC1F1597; Wed, 2 Oct 2019 07:50:54 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 37F153F706; Wed, 2 Oct 2019 07:50:52 -0700 (PDT) From: Steven Price To: Marc Zyngier , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH v5 01/10] KVM: arm64: Document PV-time interface Date: Wed, 2 Oct 2019 15:50:28 +0100 Message-Id: <20191002145037.51630-2-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191002145037.51630-1-steven.price@arm.com> References: <20191002145037.51630-1-steven.price@arm.com> MIME-Version: 1.0 Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Catalin Marinas , linux-doc@vger.kernel.org, Russell King , Steven Price , Paolo Bonzini X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Introduce a paravirtualization interface for KVM/arm64 based on the "Arm Paravirtualized Time for Arm-Base Systems" specification DEN 0057A. This only adds the details about "Stolen Time" as the details of "Live Physical Time" have not been fully agreed. User space can specify a reserved area of memory for the guest and inform KVM to populate the memory with information on time that the host kernel has stolen from the guest. A hypercall interface is provided for the guest to interrogate the hypervisor's support for this interface and the location of the shared memory structures. Signed-off-by: Steven Price --- Documentation/virt/kvm/arm/pvtime.txt | 65 +++++++++++++++++++++++++ Documentation/virt/kvm/devices/vcpu.txt | 14 ++++++ 2 files changed, 79 insertions(+) create mode 100644 Documentation/virt/kvm/arm/pvtime.txt diff --git a/Documentation/virt/kvm/arm/pvtime.txt b/Documentation/virt/kvm/arm/pvtime.txt new file mode 100644 index 000000000000..fa15c12eec91 --- /dev/null +++ b/Documentation/virt/kvm/arm/pvtime.txt @@ -0,0 +1,65 @@ +Paravirtualized time support for arm64 +====================================== + +Arm specification DEN0057/A defined a standard for paravirtualised time +support for AArch64 guests: + +https://developer.arm.com/docs/den0057/a + +KVM/arm64 implements the stolen time part of this specification by providing +some hypervisor service calls to support a paravirtualized guest obtaining a +view of the amount of time stolen from its execution. + +Two new SMCCC compatible hypercalls are defined: + +PV_FEATURES 0xC5000020 +PV_TIME_ST 0xC5000022 + +These are only available in the SMC64/HVC64 calling convention as +paravirtualized time is not available to 32 bit Arm guests. The existence of +the PV_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES +mechanism before calling it. + +PV_FEATURES + Function ID: (uint32) : 0xC5000020 + PV_func_id: (uint32) : The function to query for support. + Currently only PV_TIME_ST is supported. + Return value: (int32) : NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant + PV-time feature is supported by the hypervisor. + +PV_TIME_ST + Function ID: (uint32) : 0xC5000022 + Return value: (int64) : IPA of the stolen time data structure for this + VCPU. On failure: + NOT_SUPPORTED (-1) + +The IPA returned by PV_TIME_ST should be mapped by the guest as normal memory +with inner and outer write back caching attributes, in the inner shareable +domain. A total of 16 bytes from the IPA returned are guaranteed to be +meaningfully filled by the hypervisor (see structure below). + +PV_TIME_ST returns the structure for the calling VCPU. + +Stolen Time +----------- + +The structure pointed to by the PV_TIME_ST hypercall is as follows: + + Field | Byte Length | Byte Offset | Description + ----------- | ----------- | ----------- | -------------------------- + Revision | 4 | 0 | Must be 0 for version 0.1 + Attributes | 4 | 4 | Must be 0 + Stolen time | 8 | 8 | Stolen time in unsigned + | | | nanoseconds indicating how + | | | much time this VCPU thread + | | | was involuntarily not + | | | running on a physical CPU. + +The structure will be updated by the hypervisor prior to scheduling a VCPU. It +will be present within a reserved region of the normal memory given to the +guest. The guest should not attempt to write into this memory. There is a +structure per VCPU of the guest. + +For the user space interface see Documentation/virt/kvm/devices/vcpu.txt +section "3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL". + diff --git a/Documentation/virt/kvm/devices/vcpu.txt b/Documentation/virt/kvm/devices/vcpu.txt index 2b5dab16c4f2..6f3bd64a05b0 100644 --- a/Documentation/virt/kvm/devices/vcpu.txt +++ b/Documentation/virt/kvm/devices/vcpu.txt @@ -60,3 +60,17 @@ time to use the number provided for a given timer, overwriting any previously configured values on other VCPUs. Userspace should configure the interrupt numbers on at least one VCPU after creating all VCPUs and before running any VCPUs. + +3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL +Architectures: ARM64 + +3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA +Parameters: 64-bit base address +Returns: -ENXIO: Stolen time not implemented + -EEXIST: Base address already set for this VCPU + -EINVAL: Base address not 64 byte aligned + +Specifies the base address of the stolen time structure for this VCPU. The +base address must be 64 byte aligned and exist within a valid guest memory +region. See Documentation/virt/kvm/arm/pvtime.txt for more information +including the layout of the stolen time structure. -- 2.20.1 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 07142C352AA for ; Wed, 2 Oct 2019 14:51:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D1C6021A4C for ; Wed, 2 Oct 2019 14:51:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="u1vDQ9Wr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D1C6021A4C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9DErSr+O7T0Tji9io+DCklP8dUjTV3kXCVd/Ann7Ufc=; b=u1vDQ9Wr6wkSqZ 6eNtVe+GhSITVWV5UJDduAmGIhIV6QJA9kNWj5ZW4rJrwGZOWKiJIuO6EPNaD6iivdNmwuwS72ydB T8j8rG8pEaNjL8TJ1azCN4jXq/qpsifrQ1Aj6yQ5WCiyead0RXKrG3HDkfnveRluGHrm9XJ34AR8g xJr1fr3mM1bsJectA9gq8b044xom689k82tiETkdaZyoHyWXPPBZNA3XIvFZl5VEwtEHzyO8G6BF4 5SxlC7M4pTdmQpCtWSn7iIo68jumdSduM7nGe6vixA8/ccQx/g4IjKeE19b4yHGwYJoK/QoGktMwZ rd6OtkJmcqMD+bbMcZdg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iFfyK-0002cZ-3A; Wed, 02 Oct 2019 14:51:20 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iFfxw-0002Es-PO for linux-arm-kernel@lists.infradead.org; Wed, 02 Oct 2019 14:50:58 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3DC1F1597; Wed, 2 Oct 2019 07:50:54 -0700 (PDT) Received: from e112269-lin.arm.com (e112269-lin.cambridge.arm.com [10.1.196.133]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 37F153F706; Wed, 2 Oct 2019 07:50:52 -0700 (PDT) From: Steven Price To: Marc Zyngier , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: [PATCH v5 01/10] KVM: arm64: Document PV-time interface Date: Wed, 2 Oct 2019 15:50:28 +0100 Message-Id: <20191002145037.51630-2-steven.price@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191002145037.51630-1-steven.price@arm.com> References: <20191002145037.51630-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191002_075056_909530_C0FE6328 X-CRM114-Status: GOOD ( 19.15 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Catalin Marinas , Suzuki K Pouloze , linux-doc@vger.kernel.org, Russell King , Steven Price , James Morse , Paolo Bonzini , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Introduce a paravirtualization interface for KVM/arm64 based on the "Arm Paravirtualized Time for Arm-Base Systems" specification DEN 0057A. This only adds the details about "Stolen Time" as the details of "Live Physical Time" have not been fully agreed. User space can specify a reserved area of memory for the guest and inform KVM to populate the memory with information on time that the host kernel has stolen from the guest. A hypercall interface is provided for the guest to interrogate the hypervisor's support for this interface and the location of the shared memory structures. Signed-off-by: Steven Price --- Documentation/virt/kvm/arm/pvtime.txt | 65 +++++++++++++++++++++++++ Documentation/virt/kvm/devices/vcpu.txt | 14 ++++++ 2 files changed, 79 insertions(+) create mode 100644 Documentation/virt/kvm/arm/pvtime.txt diff --git a/Documentation/virt/kvm/arm/pvtime.txt b/Documentation/virt/kvm/arm/pvtime.txt new file mode 100644 index 000000000000..fa15c12eec91 --- /dev/null +++ b/Documentation/virt/kvm/arm/pvtime.txt @@ -0,0 +1,65 @@ +Paravirtualized time support for arm64 +====================================== + +Arm specification DEN0057/A defined a standard for paravirtualised time +support for AArch64 guests: + +https://developer.arm.com/docs/den0057/a + +KVM/arm64 implements the stolen time part of this specification by providing +some hypervisor service calls to support a paravirtualized guest obtaining a +view of the amount of time stolen from its execution. + +Two new SMCCC compatible hypercalls are defined: + +PV_FEATURES 0xC5000020 +PV_TIME_ST 0xC5000022 + +These are only available in the SMC64/HVC64 calling convention as +paravirtualized time is not available to 32 bit Arm guests. The existence of +the PV_FEATURES hypercall should be probed using the SMCCC 1.1 ARCH_FEATURES +mechanism before calling it. + +PV_FEATURES + Function ID: (uint32) : 0xC5000020 + PV_func_id: (uint32) : The function to query for support. + Currently only PV_TIME_ST is supported. + Return value: (int32) : NOT_SUPPORTED (-1) or SUCCESS (0) if the relevant + PV-time feature is supported by the hypervisor. + +PV_TIME_ST + Function ID: (uint32) : 0xC5000022 + Return value: (int64) : IPA of the stolen time data structure for this + VCPU. On failure: + NOT_SUPPORTED (-1) + +The IPA returned by PV_TIME_ST should be mapped by the guest as normal memory +with inner and outer write back caching attributes, in the inner shareable +domain. A total of 16 bytes from the IPA returned are guaranteed to be +meaningfully filled by the hypervisor (see structure below). + +PV_TIME_ST returns the structure for the calling VCPU. + +Stolen Time +----------- + +The structure pointed to by the PV_TIME_ST hypercall is as follows: + + Field | Byte Length | Byte Offset | Description + ----------- | ----------- | ----------- | -------------------------- + Revision | 4 | 0 | Must be 0 for version 0.1 + Attributes | 4 | 4 | Must be 0 + Stolen time | 8 | 8 | Stolen time in unsigned + | | | nanoseconds indicating how + | | | much time this VCPU thread + | | | was involuntarily not + | | | running on a physical CPU. + +The structure will be updated by the hypervisor prior to scheduling a VCPU. It +will be present within a reserved region of the normal memory given to the +guest. The guest should not attempt to write into this memory. There is a +structure per VCPU of the guest. + +For the user space interface see Documentation/virt/kvm/devices/vcpu.txt +section "3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL". + diff --git a/Documentation/virt/kvm/devices/vcpu.txt b/Documentation/virt/kvm/devices/vcpu.txt index 2b5dab16c4f2..6f3bd64a05b0 100644 --- a/Documentation/virt/kvm/devices/vcpu.txt +++ b/Documentation/virt/kvm/devices/vcpu.txt @@ -60,3 +60,17 @@ time to use the number provided for a given timer, overwriting any previously configured values on other VCPUs. Userspace should configure the interrupt numbers on at least one VCPU after creating all VCPUs and before running any VCPUs. + +3. GROUP: KVM_ARM_VCPU_PVTIME_CTRL +Architectures: ARM64 + +3.1 ATTRIBUTE: KVM_ARM_VCPU_PVTIME_IPA +Parameters: 64-bit base address +Returns: -ENXIO: Stolen time not implemented + -EEXIST: Base address already set for this VCPU + -EINVAL: Base address not 64 byte aligned + +Specifies the base address of the stolen time structure for this VCPU. The +base address must be 64 byte aligned and exist within a valid guest memory +region. See Documentation/virt/kvm/arm/pvtime.txt for more information +including the layout of the stolen time structure. -- 2.20.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel