From: David Brazdil <dbrazdil@google.com>
To: Mark Rutland <mark.rutland@arm.com>
Cc: kvmarm@lists.cs.columbia.edu, Jonathan Corbet <corbet@lwn.net>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>,
Christoph Lameter <cl@linux.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Sudeep Holla <sudeep.holla@arm.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kernel-team@android.com
Subject: Re: [PATCH v3 04/23] arm64: Move MAIR_EL1_SET to asm/memory.h
Date: Tue, 1 Dec 2020 13:58:39 +0000 [thread overview]
Message-ID: <20201201135839.jsvplmeodjzsa4he@google.com> (raw)
In-Reply-To: <20201126173534.GE38486@C02TD0UTHF1T.local>
Hey Mark,
> > diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
> > index cd61239bae8c..54a22cb5b17b 100644
> > --- a/arch/arm64/include/asm/memory.h
> > +++ b/arch/arm64/include/asm/memory.h
> > @@ -152,6 +152,19 @@
> > #define MT_S2_FWB_NORMAL 6
> > #define MT_S2_FWB_DEVICE_nGnRE 1
> >
> > +/*
> > + * Default MAIR_ELx. MT_NORMAL_TAGGED is initially mapped as Normal memory and
> > + * changed during __cpu_setup to Normal Tagged if the system supports MTE.
> > + */
> > +#define MAIR_ELx_SET \
> > + (MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRnE, MT_DEVICE_nGnRnE) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_DEVICE_nGnRE, MT_DEVICE_nGnRE) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_DEVICE_GRE, MT_DEVICE_GRE) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_NORMAL_NC, MT_NORMAL_NC) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_NORMAL_WT, MT_NORMAL_WT) | \
> > + MAIR_ATTRIDX(MAIR_ATTR_NORMAL, MT_NORMAL_TAGGED))
>
> Patch 7 initializes MAIR_EL2 with this directly rather than copying it
> from MAIR_EL1, which means that MT_NORMAL_TAGGED will never be tagged
> within the nVHE hyp code.
>
> Is that expected? I suspect it's worth a comment here (introduced in
> patch 7), just to make that clear.
Ouch, that didn't use to be there. In that case let's not build more implicit
assumptions into the code. I'll pass MAIR_EL1 in kvm_nvhe_init_params.
David
next prev parent reply other threads:[~2020-12-01 13:59 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 15:53 [PATCH v3 00/23] Opt-in always-on nVHE hypervisor David Brazdil
2020-11-26 15:53 ` [PATCH v3 01/23] psci: Support psci_ops.get_version for v0.1 David Brazdil
2020-11-26 17:21 ` Mark Rutland
2020-11-26 15:54 ` [PATCH v3 02/23] psci: Accessor for configured PSCI function IDs David Brazdil
2020-11-26 17:24 ` Mark Rutland
2020-11-26 17:29 ` David Brazdil
2020-11-26 17:34 ` Lorenzo Pieralisi
2020-11-26 15:54 ` [PATCH v3 03/23] arm64: Make cpu_logical_map() take unsigned int David Brazdil
2020-11-26 17:28 ` Mark Rutland
2020-12-02 15:44 ` David Brazdil
2020-11-26 15:54 ` [PATCH v3 04/23] arm64: Move MAIR_EL1_SET to asm/memory.h David Brazdil
2020-11-26 17:35 ` Mark Rutland
2020-12-01 13:58 ` David Brazdil [this message]
2020-11-26 15:54 ` [PATCH v3 05/23] arm64: Extract parts of el2_setup into a macro David Brazdil
2020-11-26 18:06 ` Mark Rutland
2020-12-01 13:55 ` David Brazdil
2020-11-26 15:54 ` [PATCH v3 06/23] kvm: arm64: Add kvm-arm.protected early kernel parameter David Brazdil
2020-11-27 16:32 ` Sudeep Holla
2020-12-01 13:19 ` David Brazdil
2020-12-01 14:07 ` Mark Rutland
2020-12-01 14:43 ` David Brazdil
2020-12-01 14:58 ` Mark Rutland
2020-11-26 15:54 ` [PATCH v3 07/23] kvm: arm64: Initialize MAIR_EL2 using a constant David Brazdil
2020-11-26 15:54 ` [PATCH v3 08/23] kvm: arm64: Remove vector_ptr param of hyp-init David Brazdil
2020-11-26 15:54 ` [PATCH v3 09/23] kvm: arm64: Move hyp-init params to a per-CPU struct David Brazdil
2020-11-26 15:54 ` [PATCH v3 10/23] kvm: arm64: Add .hyp.data..ro_after_init ELF section David Brazdil
2020-11-26 15:54 ` [PATCH v3 11/23] kvm: arm64: Support per_cpu_ptr in nVHE hyp code David Brazdil
2020-11-26 15:54 ` [PATCH v3 12/23] kvm: arm64: Create nVHE copy of cpu_logical_map David Brazdil
2020-11-26 15:54 ` [PATCH v3 13/23] kvm: arm64: Add SMC handler in nVHE EL2 David Brazdil
2020-11-26 15:54 ` [PATCH v3 14/23] kvm: arm64: Bootstrap PSCI " David Brazdil
2020-11-26 15:54 ` [PATCH v3 15/23] kvm: arm64: Add offset for hyp VA <-> PA conversion David Brazdil
2020-11-26 15:54 ` [PATCH v3 16/23] kvm: arm64: Forward safe PSCI SMCs coming from host David Brazdil
2020-11-27 10:14 ` Lorenzo Pieralisi
2020-12-02 17:49 ` David Brazdil
2020-11-27 16:51 ` Sudeep Holla
2020-12-01 13:20 ` David Brazdil
2020-11-26 15:54 ` [PATCH v3 17/23] kvm: arm64: Extract __do_hyp_init into a helper function David Brazdil
2020-11-26 15:54 ` [PATCH v3 18/23] kvm: arm64: Add function to enter host from KVM nVHE hyp code David Brazdil
2020-11-26 15:54 ` [PATCH v3 19/23] kvm: arm64: Intercept host's CPU_ON SMCs David Brazdil
2020-11-27 17:47 ` Sudeep Holla
2020-12-01 13:51 ` David Brazdil
2020-11-26 15:54 ` [PATCH v3 20/23] kvm: arm64: Intercept host's CPU_SUSPEND PSCI SMCs David Brazdil
2020-12-01 14:57 ` Mark Rutland
2020-11-26 15:54 ` [PATCH v3 21/23] kvm: arm64: Keep nVHE EL2 vector installed David Brazdil
2020-11-26 15:54 ` [PATCH v3 22/23] kvm: arm64: Trap host SMCs in protected mode David Brazdil
2020-11-26 15:54 ` [PATCH v3 23/23] kvm: arm64: Fix EL2 mode availability checks David Brazdil
2020-11-26 15:57 ` [PATCH v3 00/23] Opt-in always-on nVHE hypervisor Matthew Wilcox
2020-11-26 16:19 ` Marc Zyngier
2020-11-26 16:23 ` Matthew Wilcox
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