From: Anshuman Khandual <anshuman.khandual@arm.com>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Oliver Upton <oupton@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] arm64: Clear VTCR_EL2 in __init_el2_stage2()
Date: Fri, 13 Mar 2026 14:09:46 +0530 [thread overview]
Message-ID: <949f02cf-9f26-40ba-9c68-1742e335e2b9@arm.com> (raw)
In-Reply-To: <87o6kscfon.wl-maz@kernel.org>
On 13/03/26 1:41 PM, Marc Zyngier wrote:
> On Fri, 13 Mar 2026 07:54:04 +0000,
> Anshuman Khandual <anshuman.khandual@arm.com> wrote:
>>
>> But it can be argued that these registers
>> need not have to be cleared now and can just be initialised before
>> setting up HCR_EL2_VM itself. In which case should we drop
>> __init_el2_stage2() entirely ?
>
> And something worth thinking of: the role of VTTBR_EL2.VMID when
> HCR_EL2.VM is 0.
Are you suggesting that VTTBR_EL2_VMID needs to be 0 even when
HCR_EL2_VM = 0 because of its corresponding TLB entries ? But
during system boot such possibilities might not really exist ?
next prev parent reply other threads:[~2026-03-13 8:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-13 5:38 [PATCH] arm64: Clear VTCR_EL2 in __init_el2_stage2() Anshuman Khandual
2026-03-13 7:25 ` Marc Zyngier
2026-03-13 7:54 ` Anshuman Khandual
2026-03-13 8:07 ` Marc Zyngier
2026-03-13 8:11 ` Marc Zyngier
2026-03-13 8:39 ` Anshuman Khandual [this message]
2026-03-13 9:06 ` Marc Zyngier
2026-03-13 9:59 ` Mark Rutland
2026-03-17 2:46 ` Anshuman Khandual
2026-03-17 9:15 ` Marc Zyngier
2026-03-17 10:16 ` Mark Rutland
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