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From: Sasha Levin <sashal@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Kristina Martsenko <kristina.martsenko@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	will@kernel.org, james.morse@arm.com, mark.rutland@arm.com,
	amit.kachhap@arm.com, maz@kernel.org, anshuman.khandual@arm.com,
	joey.gouly@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH AUTOSEL 6.4 07/12] arm64: cpufeature: detect FEAT_HCX
Date: Sun, 9 Jul 2023 10:56:13 -0400	[thread overview]
Message-ID: <ZKrKjS7sDFxhKoJT@sashalap> (raw)
In-Reply-To: <b37a9f79-97a8-4f74-a25c-b51128fbc9bb@sirena.org.uk>

On Mon, Jul 03, 2023 at 12:51:57PM +0100, Mark Brown wrote:
>On Sun, Jul 02, 2023 at 03:50:52PM -0400, Sasha Levin wrote:
>> From: Kristina Martsenko <kristina.martsenko@arm.com>
>>
>> [ Upstream commit b0c756fe996ac930033882ca56410639e5cad1ec ]
>>
>> Detect if the system has the new HCRX_EL2 register added in ARMv8.7/9.2,
>> so that subsequent patches can check for its presence.
>>
>> KVM currently relies on the register being present on all CPUs (or
>> none), so the kernel will panic if that is not the case. Fortunately no
>> such systems currently exist, but this can be revisited if they appear.
>> Note that the kernel will not panic if CONFIG_KVM is disabled.
>
>This is a new feature, it's not clear why we'd backport it (especially
>since it's a new feature which is a dependency for other features rather
>than something that people can use outside of the kernel)?

The second paragraph (above) suggested it should be.

-- 
Thanks,
Sasha

WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: Mark Brown <broonie@kernel.org>
Cc: linux-kernel@vger.kernel.org, stable@vger.kernel.org,
	Kristina Martsenko <kristina.martsenko@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	will@kernel.org, james.morse@arm.com, mark.rutland@arm.com,
	amit.kachhap@arm.com, maz@kernel.org, anshuman.khandual@arm.com,
	joey.gouly@arm.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH AUTOSEL 6.4 07/12] arm64: cpufeature: detect FEAT_HCX
Date: Sun, 9 Jul 2023 10:56:13 -0400	[thread overview]
Message-ID: <ZKrKjS7sDFxhKoJT@sashalap> (raw)
In-Reply-To: <b37a9f79-97a8-4f74-a25c-b51128fbc9bb@sirena.org.uk>

On Mon, Jul 03, 2023 at 12:51:57PM +0100, Mark Brown wrote:
>On Sun, Jul 02, 2023 at 03:50:52PM -0400, Sasha Levin wrote:
>> From: Kristina Martsenko <kristina.martsenko@arm.com>
>>
>> [ Upstream commit b0c756fe996ac930033882ca56410639e5cad1ec ]
>>
>> Detect if the system has the new HCRX_EL2 register added in ARMv8.7/9.2,
>> so that subsequent patches can check for its presence.
>>
>> KVM currently relies on the register being present on all CPUs (or
>> none), so the kernel will panic if that is not the case. Fortunately no
>> such systems currently exist, but this can be revisited if they appear.
>> Note that the kernel will not panic if CONFIG_KVM is disabled.
>
>This is a new feature, it's not clear why we'd backport it (especially
>since it's a new feature which is a dependency for other features rather
>than something that people can use outside of the kernel)?

The second paragraph (above) suggested it should be.

-- 
Thanks,
Sasha

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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2023-07-09 14:57 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-07-02 19:50 [PATCH AUTOSEL 6.4 01/12] platform/chrome: cros_ec: Report EC panic as uevent Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 02/12] ACPI: x86: Add skip i2c clients quirk for Nextbook Ares 8A Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 03/12] ACPI: button: Add lid disable DMI " Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 04/12] ACPI: x86: Add ACPI_QUIRK_UART1_SKIP for Lenovo Yoga Book yb1-x90f/l Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 05/12] ACPI: video: Add backlight=native DMI quirk for Apple iMac11,3 Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 06/12] ACPI: video: Add backlight=native DMI quirk for Lenovo ThinkPad X131e (3371 AMD version) Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 07/12] arm64: cpufeature: detect FEAT_HCX Sasha Levin
2023-07-02 19:50   ` Sasha Levin
2023-07-03 11:51   ` Mark Brown
2023-07-03 11:51     ` Mark Brown
2023-07-09 14:56     ` Sasha Levin [this message]
2023-07-09 14:56       ` Sasha Levin
2023-07-09 21:13       ` Mark Brown
2023-07-09 21:13         ` Mark Brown
2023-07-10  9:44         ` Will Deacon
2023-07-10  9:44           ` Will Deacon
2023-07-10 13:31           ` Greg KH
2023-07-10 13:31             ` Greg KH
2023-07-10 13:47             ` Mark Brown
2023-07-10 13:47               ` Mark Brown
2023-07-10 14:09               ` Greg KH
2023-07-10 14:09                 ` Greg KH
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 08/12] ACPI: resource: Remove "Zen" specific match and quirks Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 09/12] arm64: set __exception_irq_entry with __irq_entry as a default Sasha Levin
2023-07-02 19:50   ` Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 10/12] arm64: mm: fix VA-range sanity check Sasha Levin
2023-07-02 19:50   ` Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 11/12] drivers/perf: hisi: Add support for HiSilicon H60PA and PAv3 PMU driver Sasha Levin
2023-07-02 19:50   ` Sasha Levin
2023-07-03 10:14   ` Mark Rutland
2023-07-03 10:14     ` Mark Rutland
2023-07-21 15:13     ` Sasha Levin
2023-07-21 15:13       ` Sasha Levin
2023-07-02 19:50 ` [PATCH AUTOSEL 6.4 12/12] ACPI: video: Add backlight=native DMI quirk for Dell Studio 1569 Sasha Levin
2023-07-10 22:46 ` [PATCH AUTOSEL 6.4 01/12] platform/chrome: cros_ec: Report EC panic as uevent Brian Norris
2023-07-21 15:11   ` Sasha Levin

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