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From: Wei Liu <wei.liu@kernel.org>
To: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-arch@vger.kernel.org, patches@lists.linux.dev,
	mikelley@microsoft.com, kys@microsoft.com, wei.liu@kernel.org,
	gregkh@linuxfoundation.org, haiyangz@microsoft.com,
	decui@microsoft.com, apais@linux.microsoft.com,
	Tianyu.Lan@microsoft.com, ssengar@linux.microsoft.com,
	mukeshrathor@microsoft.com, stanislav.kinsburskiy@gmail.com,
	jinankjain@linux.microsoft.com, vkuznets@redhat.com,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, will@kernel.org,
	catalin.marinas@arm.com
Subject: Re: [PATCH v3 01/15] hyperv-tlfs: Change shared HV_REGISTER_* defines to HV_MSR_*
Date: Fri, 22 Sep 2023 18:52:22 +0000	[thread overview]
Message-ID: <ZQ3iZuuROFm4/7kc@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <1695407915-12216-2-git-send-email-nunodasneves@linux.microsoft.com>

On Fri, Sep 22, 2023 at 11:38:21AM -0700, Nuno Das Neves wrote:
> In x86 hyperv-tlfs, HV_REGISTER_ prefix is used to indicate MSRs
> accessed via rdmsrl/wrmsrl. But in ARM64, HV_REGISTER_ instead indicates
> VP registers accessed via get/set vp registers hypercall.
> 
> This is due to HV_REGISTER_* names being used by hv_set/get_register,
> with the arch-specific version delegating to the appropriate mechanism.
> 
> The problem is, using prefix HV_REGISTER_ for MSRs will conflict with
> VP registers when they are introduced for x86 in future.
> 
> This patch solves the issue by:
> 
> 1. Defining all the x86 MSRs with a consistent prefix: HV_X64_MSR_.
>    This is so HV_REGISTER_ can be reserved for VP registers.
> 
> 2. Change the non-arch-specific alias used by hv_set/get_register to
>    HV_MSR_. This is also happens to be the same name HyperV uses for this
>    purpose.

HyperV -> Hyper-V. I can fix this up when I apply this patch.

> 
> Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>

Reviewed-by: Wei Liu <wei.liu@kernel.org>

WARNING: multiple messages have this Message-ID (diff)
From: Wei Liu <wei.liu@kernel.org>
To: Nuno Das Neves <nunodasneves@linux.microsoft.com>
Cc: linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-arch@vger.kernel.org, patches@lists.linux.dev,
	mikelley@microsoft.com, kys@microsoft.com, wei.liu@kernel.org,
	gregkh@linuxfoundation.org, haiyangz@microsoft.com,
	decui@microsoft.com, apais@linux.microsoft.com,
	Tianyu.Lan@microsoft.com, ssengar@linux.microsoft.com,
	mukeshrathor@microsoft.com, stanislav.kinsburskiy@gmail.com,
	jinankjain@linux.microsoft.com, vkuznets@redhat.com,
	tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, hpa@zytor.com, will@kernel.org,
	catalin.marinas@arm.com
Subject: Re: [PATCH v3 01/15] hyperv-tlfs: Change shared HV_REGISTER_* defines to HV_MSR_*
Date: Fri, 22 Sep 2023 18:52:22 +0000	[thread overview]
Message-ID: <ZQ3iZuuROFm4/7kc@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <1695407915-12216-2-git-send-email-nunodasneves@linux.microsoft.com>

On Fri, Sep 22, 2023 at 11:38:21AM -0700, Nuno Das Neves wrote:
> In x86 hyperv-tlfs, HV_REGISTER_ prefix is used to indicate MSRs
> accessed via rdmsrl/wrmsrl. But in ARM64, HV_REGISTER_ instead indicates
> VP registers accessed via get/set vp registers hypercall.
> 
> This is due to HV_REGISTER_* names being used by hv_set/get_register,
> with the arch-specific version delegating to the appropriate mechanism.
> 
> The problem is, using prefix HV_REGISTER_ for MSRs will conflict with
> VP registers when they are introduced for x86 in future.
> 
> This patch solves the issue by:
> 
> 1. Defining all the x86 MSRs with a consistent prefix: HV_X64_MSR_.
>    This is so HV_REGISTER_ can be reserved for VP registers.
> 
> 2. Change the non-arch-specific alias used by hv_set/get_register to
>    HV_MSR_. This is also happens to be the same name HyperV uses for this
>    purpose.

HyperV -> Hyper-V. I can fix this up when I apply this patch.

> 
> Signed-off-by: Nuno Das Neves <nunodasneves@linux.microsoft.com>

Reviewed-by: Wei Liu <wei.liu@kernel.org>

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-09-22 18:53 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-09-22 18:38 [PATCH v3 00/15] Introduce /dev/mshv drivers Nuno Das Neves
2023-09-22 18:38 ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 01/15] hyperv-tlfs: Change shared HV_REGISTER_* defines to HV_MSR_* Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:52   ` Wei Liu [this message]
2023-09-22 18:52     ` Wei Liu
2023-09-22 18:38 ` [PATCH v3 02/15] mshyperv: Introduce hv_get_hypervisor_version function Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:53   ` Wei Liu
2023-09-22 18:53     ` Wei Liu
2023-09-22 18:38 ` [PATCH v3 03/15] mshyperv: Introduce numa_node_to_proximity_domain_info Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 04/15] asm-generic/mshyperv: Introduce hv_recommend_using_aeoi() Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 05/15] hyperv: Move hv_connection_id to hyperv-tlfs Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 06/15] hyperv-tlfs: Introduce hv_status_to_string and hv_status_to_errno Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 07/15] Drivers: hv: Move hv_call_deposit_pages and hv_call_create_vp to common code Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 08/15] Drivers: hv: Introduce per-cpu event ring tail Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 09/15] Drivers: hv: Introduce hv_output_arg_exists in hv_common.c Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 10/15] x86: hyperv: Add mshv_handler irq handler and setup function Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 11/15] Drivers: hv: export vmbus_isr, hv_context and hv_post_message Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 12/15] Documentation: Reserve ioctl number for mshv driver Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:48   ` Wei Liu
2023-09-22 18:48     ` Wei Liu
2023-09-22 18:38 ` [PATCH v3 13/15] uapi: hyperv: Add mshv driver headers defining hypervisor ABIs Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 14/15] asm-generic: hyperv: Use new Hyper-V headers conditionally Nuno Das Neves
2023-09-22 18:38   ` Nuno Das Neves
2023-09-22 18:38 ` [PATCH v3 15/15] Drivers: hv: Add modules to expose /dev/mshv to VMMs running on Hyper-V Nuno Das Neves
2023-09-22 20:02   ` Wei Liu
2023-09-22 20:02     ` Wei Liu
2023-09-23  7:56   ` Greg KH
2023-09-23  7:56     ` Greg KH
2023-09-23 20:58     ` Wei Liu
2023-09-23 20:58       ` Wei Liu
2023-09-24  4:48       ` Saurabh Singh Sengar
2023-09-24  4:48         ` Saurabh Singh Sengar
2023-09-23  7:58   ` Greg KH
2023-09-23  7:58     ` Greg KH
2023-09-26  0:07     ` Nuno Das Neves
2023-09-26  0:07       ` Nuno Das Neves
2023-09-26  4:52       ` Greg KH
2023-09-26  4:52         ` Greg KH
2023-09-26  5:54         ` Wei Liu
2023-09-26  5:54           ` Wei Liu
2023-09-26  6:31           ` Greg KH
2023-09-26  6:31             ` Greg KH
2023-09-26  7:00             ` Wei Liu
2023-09-26  7:00               ` Wei Liu
2023-09-26  8:03               ` Greg KH
2023-09-26  8:03                 ` Greg KH
2023-09-26 21:52                 ` Nuno Das Neves
2023-09-26 21:52                   ` Nuno Das Neves
2023-09-27  6:01                   ` Greg KH
2023-09-27  6:01                     ` Greg KH
2023-09-27  8:04                     ` Wei Liu
2023-09-27  8:04                       ` Wei Liu
2023-09-27  8:33                       ` Greg KH
2023-09-27  8:33                         ` Greg KH
2023-09-28  0:17                         ` Nuno Das Neves
2023-09-28  0:17                           ` Nuno Das Neves
2023-09-26 12:33       ` Saurabh Singh Sengar
2023-09-26 12:33         ` Saurabh Singh Sengar

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