From: Elliot Berman <quic_eberman@quicinc.com> To: Alex Elder <elder@linaro.org>, Bjorn Andersson <quic_bjorande@quicinc.com>, Catalin Marinas <catalin.marinas@arm.com>, "Will Deacon" <will@kernel.org>, Murali Nalajala <quic_mnalajal@quicinc.com> Cc: Trilok Soni <quic_tsoni@quicinc.com>, Srivatsa Vaddagiri <quic_svaddagi@quicinc.com>, Carl van Schaik <quic_cvanscha@quicinc.com>, Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Jonathan Corbet <corbet@lwn.net>, "Bagas Sanjaya" <bagasdotme@gmail.com>, Jassi Brar <jassisinghbrar@gmail.com>, "Sudeep Holla" <sudeep.holla@arm.com>, Mark Rutland <mark.rutland@arm.com>, "Lorenzo Pieralisi" <lpieralisi@kernel.org>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-acpi@vger.kernel.org> Subject: Re: [PATCH v8 05/28] virt: gunyah: Add hypercalls to identify Gunyah Date: Tue, 17 Jan 2023 14:29:31 -0800 [thread overview] Message-ID: <59bddf7a-f420-cccd-8029-65052f834c62@quicinc.com> (raw) In-Reply-To: <b2819f68-8672-4909-c787-d1bdbd35da2e@linaro.org> On 1/17/2023 11:20 AM, Alex Elder wrote: > On 1/10/23 11:56 AM, Elliot Berman wrote: >>>> There are two calls to help identify Gunyah: >>>> >>>> 1. gh_hypercall_get_uid() returns a UID when running under a Gunyah >>>> hypervisor. >>>> 2. gh_hypercall_hyp_identify() returns build information and a set of >>>> feature flags that are supported by Gunyah. >>> >>> The first is a "service", while the second is a "hypercall". >>> Can you explain the distinction? The sentence at the top >>> refers to both as "hypercalls". >>> >> >> I learned more details about this to answer your question. "get_uid()" >> is a standardized call that is ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID >> defined in include/arm-smccc.h. I'll use that. > > You didn't really explain the distinction between hypercall > and service in Gunyah. Both are encoded as "vendor specific > hypervisor service calls" according to the SVCCC specification. > I haven't found where ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID > gets handled, but I accept your answer that it's basically > a standard call. The "get UID" is the only one that's defined > as a Gunyah "service"; the rest are hypercalls. > This came from a Gunyah implementation detail that separates standard (service) calls from the non-standard calls. I was following the distinction from Gunyah code not realizing that it's actually a standardized call that Linux would already have support for. Thanks, Elliot > It's not a big deal, I just noticed the difference and was > curious about it. > > -Alex _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Elliot Berman <quic_eberman@quicinc.com> To: Alex Elder <elder@linaro.org>, Bjorn Andersson <quic_bjorande@quicinc.com>, Catalin Marinas <catalin.marinas@arm.com>, "Will Deacon" <will@kernel.org>, Murali Nalajala <quic_mnalajal@quicinc.com> Cc: Trilok Soni <quic_tsoni@quicinc.com>, Srivatsa Vaddagiri <quic_svaddagi@quicinc.com>, Carl van Schaik <quic_cvanscha@quicinc.com>, Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>, Arnd Bergmann <arnd@arndb.de>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Rob Herring <robh+dt@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Jonathan Corbet <corbet@lwn.net>, "Bagas Sanjaya" <bagasdotme@gmail.com>, Jassi Brar <jassisinghbrar@gmail.com>, "Sudeep Holla" <sudeep.holla@arm.com>, Mark Rutland <mark.rutland@arm.com>, "Lorenzo Pieralisi" <lpieralisi@kernel.org>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-acpi@vger.kernel.org> Subject: Re: [PATCH v8 05/28] virt: gunyah: Add hypercalls to identify Gunyah Date: Tue, 17 Jan 2023 14:29:31 -0800 [thread overview] Message-ID: <59bddf7a-f420-cccd-8029-65052f834c62@quicinc.com> (raw) In-Reply-To: <b2819f68-8672-4909-c787-d1bdbd35da2e@linaro.org> On 1/17/2023 11:20 AM, Alex Elder wrote: > On 1/10/23 11:56 AM, Elliot Berman wrote: >>>> There are two calls to help identify Gunyah: >>>> >>>> 1. gh_hypercall_get_uid() returns a UID when running under a Gunyah >>>> hypervisor. >>>> 2. gh_hypercall_hyp_identify() returns build information and a set of >>>> feature flags that are supported by Gunyah. >>> >>> The first is a "service", while the second is a "hypercall". >>> Can you explain the distinction? The sentence at the top >>> refers to both as "hypercalls". >>> >> >> I learned more details about this to answer your question. "get_uid()" >> is a standardized call that is ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID >> defined in include/arm-smccc.h. I'll use that. > > You didn't really explain the distinction between hypercall > and service in Gunyah. Both are encoded as "vendor specific > hypervisor service calls" according to the SVCCC specification. > I haven't found where ARM_SMCCC_VENDOR_HYP_CALL_UID_FUNC_ID > gets handled, but I accept your answer that it's basically > a standard call. The "get UID" is the only one that's defined > as a Gunyah "service"; the rest are hypercalls. > This came from a Gunyah implementation detail that separates standard (service) calls from the non-standard calls. I was following the distinction from Gunyah code not realizing that it's actually a standardized call that Linux would already have support for. Thanks, Elliot > It's not a big deal, I just noticed the difference and was > curious about it. > > -Alex
next prev parent reply other threads:[~2023-01-17 22:31 UTC|newest] Thread overview: 137+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-12-19 22:58 [PATCH v8 00/28] Drivers for gunyah hypervisor Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 01/28] docs: gunyah: Introduce Gunyah Hypervisor Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:54 ` Elliot Berman 2023-01-10 17:54 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 02/28] dt-bindings: Add binding for gunyah hypervisor Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2022-12-19 22:58 ` [PATCH v8 03/28] gunyah: Common types and error codes for Gunyah hypercalls Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:55 ` Elliot Berman 2023-01-10 17:55 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 04/28] arm64: smccc: Include alternative-macros.h Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 22:55 ` Elliot Berman 2023-01-10 22:55 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 05/28] virt: gunyah: Add hypercalls to identify Gunyah Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:56 ` Elliot Berman 2023-01-10 17:56 ` Elliot Berman 2023-01-17 19:20 ` Alex Elder 2023-01-17 19:20 ` Alex Elder 2023-01-17 19:20 ` Alex Elder 2023-01-17 19:20 ` Alex Elder 2023-01-17 22:29 ` Elliot Berman [this message] 2023-01-17 22:29 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 06/28] virt: gunyah: Identify hypervisor version Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:56 ` Elliot Berman 2023-01-10 17:56 ` Elliot Berman 2023-01-17 19:21 ` Alex Elder 2023-01-17 19:21 ` Alex Elder 2023-01-17 22:29 ` Elliot Berman 2023-01-17 22:29 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 07/28] mailbox: Allow direct registration to a channel Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:57 ` Elliot Berman 2023-01-10 17:57 ` Elliot Berman 2023-01-17 19:21 ` Alex Elder 2023-01-17 19:21 ` Alex Elder 2022-12-19 22:58 ` [PATCH v8 08/28] virt: gunyah: msgq: Add hypercalls to send and receive messages Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 09/28] mailbox: Add Gunyah message queue mailbox Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-02 6:13 ` Srivatsa Vaddagiri 2023-01-02 6:13 ` Srivatsa Vaddagiri 2023-01-04 0:32 ` Elliot Berman 2023-01-04 0:32 ` Elliot Berman 2023-01-09 21:34 ` Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 18:16 ` Elliot Berman 2023-01-10 18:16 ` Elliot Berman 2023-01-17 19:21 ` Alex Elder 2023-01-17 19:21 ` Alex Elder 2022-12-19 22:58 ` [PATCH v8 10/28] gunyah: rsc_mgr: Add resource manager RPC core Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-17 22:33 ` Alex Elder 2023-01-17 22:33 ` Alex Elder 2023-01-20 23:18 ` Elliot Berman 2023-01-20 23:18 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 11/28] gunyah: rsc_mgr: Add VM lifecycle RPC Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 7:13 ` Srivatsa Vaddagiri 2023-01-09 7:13 ` Srivatsa Vaddagiri 2023-01-09 18:51 ` Elliot Berman 2023-01-09 18:51 ` Elliot Berman 2023-01-18 18:26 ` Alex Elder 2023-01-18 18:26 ` Alex Elder 2023-01-20 1:31 ` Elliot Berman 2023-01-20 1:31 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 12/28] gunyah: vm_mgr: Introduce basic VM Manager Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 9:05 ` Srivatsa Vaddagiri 2023-01-09 9:05 ` Srivatsa Vaddagiri 2023-01-09 19:38 ` Elliot Berman 2023-01-09 19:38 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 13/28] gunyah: rsc_mgr: Add RPC for sharing memory Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-16 8:45 ` Srivatsa Vaddagiri 2023-01-16 8:45 ` Srivatsa Vaddagiri 2022-12-19 22:58 ` [PATCH v8 14/28] gunyah: vm_mgr: Add/remove user memory regions Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-20 5:34 ` Srivatsa Vaddagiri 2023-01-20 5:34 ` Srivatsa Vaddagiri 2022-12-19 22:58 ` [PATCH v8 15/28] gunyah: vm_mgr: Add ioctls to support basic non-proxy VM boot Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 16/28] samples: Add sample userspace Gunyah VM Manager Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 17/28] gunyah: rsc_mgr: Add platform ops on mem_lend/mem_reclaim Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 18/28] firmware: qcom_scm: Use fixed width src vm bitmap Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 19/28] firmware: qcom_scm: Register Gunyah platform ops Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-23 17:21 ` kernel test robot 2022-12-19 22:58 ` [PATCH v8 20/28] docs: gunyah: Document Gunyah VM Manager Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 21/28] virt: gunyah: Translate gh_rm_hyp_resource into gunyah_resource Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 22/28] gunyah: vm_mgr: Add framework to add VM Functions Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 23/28] virt: gunyah: Add resource tickets Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 24/28] virt: gunyah: Add IO handlers Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 25/28] virt: gunyah: Add proxy-scheduled vCPUs Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 26/28] virt: gunyah: Add hypercalls for sending doorbell Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-19 22:58 ` [PATCH v8 27/28] virt: gunyah: Add irqfd interface Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2022-12-21 17:00 ` kernel test robot 2022-12-19 22:58 ` [PATCH v8 28/28] virt: gunyah: Add ioeventfd Elliot Berman 2022-12-19 22:58 ` Elliot Berman 2023-01-09 21:34 ` [PATCH v8 00/28] Drivers for gunyah hypervisor Alex Elder 2023-01-09 21:34 ` Alex Elder 2023-01-10 17:54 ` Elliot Berman 2023-01-10 17:54 ` Elliot Berman 2023-01-10 21:47 ` Elliot Berman 2023-01-10 21:47 ` Elliot Berman 2023-01-17 19:20 ` Alex Elder 2023-01-17 19:20 ` Alex Elder
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