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From: Marc Zyngier <maz@kernel.org>
To: Oliver Upton <oupton@google.com>
Cc: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Peter Shier <pshier@google.com>,
	Jim Mattson <jmattson@google.com>,
	David Matlack <dmatlack@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <Alexandru.Elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	Andrew Jones <drjones@redhat.com>, Will Deacon <will@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v6 17/21] KVM: arm64: Allow userspace to configure a guest's counter-timer offset
Date: Wed, 11 Aug 2021 10:01:32 +0100	[thread overview]
Message-ID: <87wnos9wyb.wl-maz@kernel.org> (raw)
In-Reply-To: <CAOQ_Qsjn4UK81qBj-uPzoejNc4GAnZXPi=mvcoVi15N0_kayAw@mail.gmail.com>

On Tue, 10 Aug 2021 18:55:12 +0100,
Oliver Upton <oupton@google.com> wrote:
> 
> On Tue, Aug 10, 2021 at 3:56 AM Marc Zyngier <maz@kernel.org> wrote:
> >
> > On Wed, 04 Aug 2021 09:58:15 +0100,
> > Oliver Upton <oupton@google.com> wrote:

[...]

> > > diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
> > > index 73c7139c866f..7252ffa3d675 100644
> > > --- a/include/clocksource/arm_arch_timer.h
> > > +++ b/include/clocksource/arm_arch_timer.h
> > > @@ -21,6 +21,7 @@
> > >  #define CNTHCTL_EVNTEN                       (1 << 2)
> > >  #define CNTHCTL_EVNTDIR                      (1 << 3)
> > >  #define CNTHCTL_EVNTI                        (0xF << 4)
> > > +#define CNTHCTL_ECV                  (1 << 12)
> > >
> > >  enum arch_timer_reg {
> > >       ARCH_TIMER_REG_CTRL,
> >
> > You also want to document that SCR_EL3.ECVEn has to be set to 1 for
> > this to work (see Documentation/arm64/booting.txt). And if it isn't,
> > the firmware better handle the CNTPOFF_EL2 traps correctly...
> 
> I'll grab the popcorn now ;-) Adding docs for this, good idea.
> 
> > What firmware did you use for this? I think we need to update the boot
> > wrapper, but that's something that can be done in parallel.
> 
> I had actually just done a direct boot from ARM-TF -> Linux, nothing
> else in between.

Ah, right. I tend to use the boot-wrapper[1] to build a single binary
that contains the 'boot loader', DT and kernel. Using ATF is probably
more representative of the final thing, but the boot-wrapper is dead
easy to hack on...

Thanks,

	M.

[1] git://git.kernel.org/pub/scm/linux/kernel/git/mark/boot-wrapper-aarch64.git

-- 
Without deviation from the norm, progress is not possible.

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  reply	other threads:[~2021-08-11  9:32 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-04  8:57 [PATCH v6 00/21] KVM: Add idempotent controls for migrating system counter state Oliver Upton
2021-08-04  8:57 ` [PATCH v6 01/21] KVM: x86: Fix potential race in KVM_GET_CLOCK Oliver Upton
2021-08-11 12:23   ` Paolo Bonzini
2021-08-13 10:39     ` Oliver Upton
2021-08-13 10:44       ` Paolo Bonzini
2021-08-13 17:46         ` Oliver Upton
2021-08-04  8:58 ` [PATCH v6 02/21] KVM: x86: Report host tsc and realtime values " Oliver Upton
2021-08-04  8:58 ` [PATCH v6 03/21] KVM: x86: Take the pvclock sync lock behind the tsc_write_lock Oliver Upton
2021-08-04  8:58 ` [PATCH v6 04/21] KVM: x86: Refactor tsc synchronization code Oliver Upton
2021-08-04  8:58 ` [PATCH v6 05/21] KVM: x86: Expose TSC offset controls to userspace Oliver Upton
2021-08-04  8:58 ` [PATCH v6 06/21] tools: arch: x86: pull in pvclock headers Oliver Upton
2021-08-04  8:58 ` [PATCH v6 07/21] selftests: KVM: Add test for KVM_{GET,SET}_CLOCK Oliver Upton
2021-08-04  8:58 ` [PATCH v6 08/21] selftests: KVM: Fix kvm device helper ioctl assertions Oliver Upton
2021-08-04  8:58 ` [PATCH v6 09/21] selftests: KVM: Add helpers for vCPU device attributes Oliver Upton
2021-08-04  8:58 ` [PATCH v6 10/21] selftests: KVM: Introduce system counter offset test Oliver Upton
2021-08-04  8:58 ` [PATCH v6 11/21] KVM: arm64: Refactor update_vtimer_cntvoff() Oliver Upton
2021-08-04  9:23   ` Andrew Jones
2021-08-04  8:58 ` [PATCH v6 12/21] KVM: arm64: Separate guest/host counter offset values Oliver Upton
2021-08-04 10:19   ` Andrew Jones
2021-08-04  8:58 ` [PATCH v6 13/21] KVM: arm64: Allow userspace to configure a vCPU's virtual offset Oliver Upton
2021-08-04 10:20   ` Andrew Jones
2021-08-10  9:35   ` Marc Zyngier
2021-08-10  9:44     ` Oliver Upton
2021-08-11 15:22       ` Marc Zyngier
2021-08-04  8:58 ` [PATCH v6 14/21] selftests: KVM: Add helper to check for register presence Oliver Upton
2021-08-04  9:14   ` Andrew Jones
2021-08-04  8:58 ` [PATCH v6 15/21] selftests: KVM: Add support for aarch64 to system_counter_offset_test Oliver Upton
2021-08-04  8:58 ` [PATCH v6 16/21] arm64: cpufeature: Enumerate support for Enhanced Counter Virtualization Oliver Upton
2021-08-10  9:38   ` Marc Zyngier
2021-08-04  8:58 ` [PATCH v6 17/21] KVM: arm64: Allow userspace to configure a guest's counter-timer offset Oliver Upton
2021-08-04 10:17   ` Andrew Jones
2021-08-04 10:22     ` Oliver Upton
2021-08-10 10:56   ` Marc Zyngier
2021-08-10 17:55     ` Oliver Upton
2021-08-11  9:01       ` Marc Zyngier [this message]
2021-08-04  8:58 ` [PATCH v6 18/21] KVM: arm64: Configure timer traps in vcpu_load() for VHE Oliver Upton
2021-08-04 10:25   ` Andrew Jones
2021-08-04  8:58 ` [PATCH v6 19/21] KVM: arm64: Emulate physical counter offsetting on non-ECV systems Oliver Upton
2021-08-04 11:05   ` Andrew Jones
2021-08-05  6:27     ` Oliver Upton
2021-08-10 11:27   ` Marc Zyngier
2021-08-04  8:58 ` [PATCH v6 20/21] selftests: KVM: Test physical counter offsetting Oliver Upton
2021-08-04 11:03   ` Andrew Jones
2021-08-04  8:58 ` [PATCH v6 21/21] selftests: KVM: Add counter emulation benchmark Oliver Upton
2021-08-04 11:05 ` [PATCH v6 00/21] KVM: Add idempotent controls for migrating system counter state Oliver Upton
2021-08-04 22:03   ` Oliver Upton
2021-08-10  0:04     ` Oliver Upton
2021-08-10 12:30       ` Marc Zyngier
2021-08-11 13:05 ` Paolo Bonzini
2021-08-11 18:56   ` Oliver Upton
2021-08-11 19:01     ` Marc Zyngier

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