From: Marc Zyngier <marc.zyngier@arm.com>
To: Christoffer Dall <christoffer.dall@linaro.org>
Cc: kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
Shih-Wei Li <shihwei@cs.columbia.edu>,
Christoffer Dall <cdall@linaro.org>
Subject: Re: [PATCH v4 10/20] KVM: arm/arm64: Use separate timer for phys timer emulation
Date: Wed, 25 Oct 2017 14:59:13 +0100 [thread overview]
Message-ID: <867evjcor2.fsf@arm.com> (raw)
In-Reply-To: <20171020114939.12554-11-christoffer.dall@linaro.org> (Christoffer Dall's message of "Fri, 20 Oct 2017 13:49:29 +0200")
On Fri, Oct 20 2017 at 1:49:29 pm BST, Christoffer Dall <christoffer.dall@linaro.org> wrote:
> From: Christoffer Dall <cdall@linaro.org>
>
> We were using the same hrtimer for emulating the physical timer and for
> making sure a blocking VCPU thread would be eventually woken up. That
> worked fine in the previous arch timer design, but as we are about to
> actually use the soft timer expire function for the physical timer
> emulation, change the logic to use a dedicated hrtimer.
>
> This has the added benefit of not having to cancel any work in the sync
> path, which in turn allows us to run the flush and sync with IRQs
> disabled.
>
> Note that the hrtimer used to program the host kernel's timer to
> generate an exit from the guest when the emulated physical timer fires
> never has to inject any work, and to share the soft_timer_cancel()
> function with the bg_timer, we change the function to only cancel any
> pending work if the pointer to the work struct is not null.
>
> Signed-off-by: Christoffer Dall <cdall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
M.
--
Jazz is not dead. It just smells funny.
next prev parent reply other threads:[~2017-10-25 13:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-20 11:49 [PATCH v4 00/20] KVM: arm/arm64: Optimize arch timer register handling Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 01/20] irqchip/gic: Deal with broken firmware exposing only 4kB of GICv2 CPU interface Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 02/20] arm64: Implement arch_counter_get_cntpct to read the physical counter Christoffer Dall
2017-10-25 13:41 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 03/20] arm64: Use physical counter for in-kernel reads when booted in EL2 Christoffer Dall
2017-10-25 13:43 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 04/20] KVM: arm/arm64: Guard kvm_vgic_map_is_active against !vgic_initialized Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 05/20] KVM: arm/arm64: Support calling vgic_update_irq_pending from irq context Christoffer Dall
2017-10-25 13:45 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 06/20] KVM: arm/arm64: Check that system supports split eoi/deactivate Christoffer Dall
2017-10-25 13:47 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 07/20] KVM: arm/arm64: Make timer_arm and timer_disarm helpers more generic Christoffer Dall
2017-10-25 13:49 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 08/20] KVM: arm/arm64: Rename soft timer to bg_timer Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 09/20] KVM: arm/arm64: Move timer/vgic flush/sync under disabled irq Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 10/20] KVM: arm/arm64: Use separate timer for phys timer emulation Christoffer Dall
2017-10-25 13:59 ` Marc Zyngier [this message]
2017-10-20 11:49 ` [PATCH v4 11/20] KVM: arm/arm64: Move timer save/restore out of the hyp code Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 12/20] genirq: Document vcpu_info usage for percpu_devid interrupts Christoffer Dall
2017-10-20 11:56 ` Thomas Gleixner
2017-10-21 14:29 ` Christoffer Dall
2017-10-21 14:55 ` Thomas Gleixner
2017-10-21 15:30 ` Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 13/20] KVM: arm/arm64: Set VCPU affinity for virt timer irq Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 14/20] KVM: arm/arm64: Avoid timer save/restore in vcpu entry/exit Christoffer Dall
2017-10-25 14:36 ` Marc Zyngier
2017-11-16 20:30 ` Jintack Lim
2017-11-16 20:32 ` Jintack Lim
2017-11-20 11:15 ` Christoffer Dall
2017-11-20 16:32 ` Jintack Lim
2017-10-20 11:49 ` [PATCH v4 15/20] KVM: arm/arm64: Support EL1 phys timer register access in set/get reg Christoffer Dall
2017-10-25 14:38 ` Marc Zyngier
2017-10-20 11:49 ` [PATCH v4 16/20] KVM: arm/arm64: Use kvm_arm_timer_set/get_reg for guest register traps Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 17/20] KVM: arm/arm64: Move phys_timer_emulate function Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 18/20] KVM: arm/arm64: Avoid phys timer emulation in vcpu entry/exit Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 19/20] KVM: arm/arm64: Get rid of kvm_timer_flush_hwstate Christoffer Dall
2017-10-20 11:49 ` [PATCH v4 20/20] KVM: arm/arm64: Rework kvm_timer_should_fire Christoffer Dall
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=867evjcor2.fsf@arm.com \
--to=marc.zyngier@arm.com \
--cc=cdall@linaro.org \
--cc=christoffer.dall@linaro.org \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=shihwei@cs.columbia.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox