From mboxrd@z Thu Jan 1 00:00:00 1970 From: christoffer.dall@linaro.org (Christoffer Dall) Date: Mon, 31 Aug 2015 10:57:52 +0200 Subject: [PATCH 9/9] arm/arm64: KVM: arch timer: Reset CNTV_CTL to 0 In-Reply-To: References: <1440942866-23802-1-git-send-email-christoffer.dall@linaro.org> <1440942866-23802-10-git-send-email-christoffer.dall@linaro.org> Message-ID: <20150831085752.GH24113@cbox> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Mon, Aug 31, 2015 at 10:46:59AM +0200, Ard Biesheuvel wrote: > On 30 August 2015 at 15:54, Christoffer Dall > wrote: > > Provide a better quality of implementation and be architecture compliant > > on ARMv7 for the architected timer by resetting the CNTV_CTL to 0 on > > reset of the timer, and call kvm_timer_update_state(vcpu) at the same > > time, ensuring the timer output is not asserted after, for example, a > > PSCI system reset. > > > > This change alone fixes the UEFI reset issue reported by Laszlo back in > > February. > > > > Do you have a link to that report? I can't quite remember the details ... > There was no public mailing list cc'ed on the report, and the bugzilla bug was created in a non-public Red Hat instance. But you were cc'ed on the original mail from Laszlo. Look for an e-mail from February 5th with the subject "virtual timer interrupt stuck across guest firmware reboot on KVM". -Christoffer