From: Gavin Shan <gshan@redhat.com>
To: Joey Gouly <joey.gouly@arm.com>,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
Cc: anshuman.khandual@arm.com, james.morse@arm.com,
Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
Jing Zhang <jingzhangos@google.com>,
Shameerali Kolothum Thodi <shameerali.kolothum.thodi@huawei.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Subject: Re: [PATCH v5 2/7] arm64: head.S: Initialise MPAM EL2 registers and disable traps
Date: Thu, 17 Oct 2024 09:41:53 +1000 [thread overview]
Message-ID: <4186940e-100e-4a4a-90ac-d19eeb0eaa47@redhat.com> (raw)
In-Reply-To: <20241015133923.3910916-3-joey.gouly@arm.com>
On 10/15/24 11:39 PM, Joey Gouly wrote:
> From: James Morse <james.morse@arm.com>
>
> Add code to head.S's el2_setup to detect MPAM and disable any EL2 traps.
> This register resets to an unknown value, setting it to the default
> parititons/pmg before we enable the MMU is the best thing to do.
>
> Kexec/kdump will depend on this if the previous kernel left the CPU
> configured with a restrictive configuration.
>
> If linux is booted at the highest implemented exception level el2_setup
> will clear the enable bit, disabling MPAM.
>
> This code can't be enabled until a subsequent patch adds the Kconfig
> and cpufeature boiler plate.
>
> Signed-off-by: James Morse <james.morse@arm.com>
> Signed-off-by: Joey Gouly <joey.gouly@arm.com>
> ---
> arch/arm64/include/asm/el2_setup.h | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
Reviewed-by: Gavin Shan <gshan@redhat.com>
next prev parent reply other threads:[~2024-10-16 23:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-15 13:39 [PATCH v5 0/7] KVM: arm64: Hide unsupported MPAM from the guest Joey Gouly
2024-10-15 13:39 ` [PATCH v5 1/7] arm64/sysreg: Convert existing MPAM sysregs and add the remaining entries Joey Gouly
2024-10-16 23:41 ` Gavin Shan
2024-10-15 13:39 ` [PATCH v5 2/7] arm64: head.S: Initialise MPAM EL2 registers and disable traps Joey Gouly
2024-10-16 23:41 ` Gavin Shan [this message]
2024-10-15 13:39 ` [PATCH v5 3/7] arm64: cpufeature: discover CPU support for MPAM Joey Gouly
2024-10-17 2:36 ` Gavin Shan
2024-10-15 13:39 ` [PATCH v5 4/7] KVM: arm64: Fix missing traps of guest accesses to the MPAM registers Joey Gouly
2024-10-17 0:10 ` Oliver Upton
2024-10-17 10:58 ` Joey Gouly
2024-10-17 16:07 ` Oliver Upton
2024-10-22 14:31 ` Joey Gouly
2024-10-17 2:37 ` Gavin Shan
2024-10-17 11:54 ` Marc Zyngier
2024-10-17 13:06 ` Joey Gouly
2024-10-17 13:38 ` Marc Zyngier
2024-10-17 13:43 ` Marc Zyngier
2024-10-15 13:39 ` [PATCH v5 5/7] KVM: arm64: Add a macro for creating filtered sys_reg_descs entries Joey Gouly
2024-10-17 2:37 ` Gavin Shan
2024-10-15 13:39 ` [PATCH v5 6/7] KVM: arm64: Disable MPAM visibility by default and ignore VMM writes Joey Gouly
2024-10-17 2:37 ` Gavin Shan
2024-10-15 13:39 ` [PATCH v5 7/7] KVM: arm64: selftests: Test ID_AA64PFR0.MPAM isn't completely ignored Joey Gouly
2024-10-17 0:41 ` Gavin Shan
2024-10-17 11:03 ` Joey Gouly
2024-10-17 8:34 ` [PATCH v5 0/7] KVM: arm64: Hide unsupported MPAM from the guest Shameerali Kolothum Thodi
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