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Wed, 15 Apr 2020 14:27:21 +0100 MIME-Version: 1.0 Date: Wed, 15 Apr 2020 14:27:21 +0100 From: Marc Zyngier To: Zenghui Yu Subject: Re: [PATCH 1/3] KVM: arm: vgic: Synchronize the whole guest on GIC{D,R}_I{S,C}ACTIVER read In-Reply-To: <190b57e6-0ac5-63bb-57d8-5bab2aea0b2c@huawei.com> References: <20200414103517.2824071-1-maz@kernel.org> <20200414103517.2824071-2-maz@kernel.org> <190b57e6-0ac5-63bb-57d8-5bab2aea0b2c@huawei.com> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: yuzenghui@huawei.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, eric.auger@redhat.com, Andre.Przywara@arm.com, julien@xen.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200415_062723_754818_00F77336 X-CRM114-Status: GOOD ( 12.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Julien Grall , kvm@vger.kernel.org, Suzuki K Poulose , Andre Przywara , Eric Auger , James Morse , Julien Thierry , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Zenghui, On 2020-04-15 14:15, Zenghui Yu wrote: > Hi Marc, > > On 2020/4/14 18:35, Marc Zyngier wrote: >> When a guest tries to read the active state of its interrupts, >> we currently just return whatever state we have in memory. This >> means that if such an interrupt lives in a List Register on another >> CPU, we fail to obsertve the latest active state for this interrupt. >> >> In order to remedy this, stop all the other vcpus so that they exit >> and we can observe the most recent value for the state. >> >> Reported-by: Julien Grall >> Signed-off-by: Marc Zyngier >> --- >> virt/kvm/arm/vgic/vgic-mmio-v2.c | 4 +- >> virt/kvm/arm/vgic/vgic-mmio-v3.c | 4 +- >> virt/kvm/arm/vgic/vgic-mmio.c | 100 >> ++++++++++++++++++++----------- >> virt/kvm/arm/vgic/vgic-mmio.h | 3 + >> 4 files changed, 71 insertions(+), 40 deletions(-) >> >> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c >> b/virt/kvm/arm/vgic/vgic-mmio-v2.c >> index 5945f062d749..d63881f60e1a 100644 >> --- a/virt/kvm/arm/vgic/vgic-mmio-v2.c >> +++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c >> @@ -422,11 +422,11 @@ static const struct vgic_register_region >> vgic_v2_dist_registers[] = { >> VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_SET, >> vgic_mmio_read_active, vgic_mmio_write_sactive, >> - NULL, vgic_mmio_uaccess_write_sactive, 1, >> + vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 1, >> VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ACTIVE_CLEAR, >> vgic_mmio_read_active, vgic_mmio_write_cactive, >> - NULL, vgic_mmio_uaccess_write_cactive, 1, >> + vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive, 1, >> VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_PRI, >> vgic_mmio_read_priority, vgic_mmio_write_priority, NULL, NULL, >> diff --git a/virt/kvm/arm/vgic/vgic-mmio-v3.c >> b/virt/kvm/arm/vgic/vgic-mmio-v3.c >> index e72dcc454247..77c8ba1a2535 100644 >> --- a/virt/kvm/arm/vgic/vgic-mmio-v3.c >> +++ b/virt/kvm/arm/vgic/vgic-mmio-v3.c >> @@ -553,11 +553,11 @@ static const struct vgic_register_region >> vgic_v3_dist_registers[] = { >> VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ISACTIVER, >> vgic_mmio_read_active, vgic_mmio_write_sactive, >> - NULL, vgic_mmio_uaccess_write_sactive, 1, >> + vgic_uaccess_read_active, vgic_mmio_uaccess_write_sactive, 1, >> VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_ICACTIVER, >> vgic_mmio_read_active, vgic_mmio_write_cactive, >> - NULL, vgic_mmio_uaccess_write_cactive, >> + vgic_uaccess_read_active, vgic_mmio_uaccess_write_cactive, >> 1, VGIC_ACCESS_32bit), >> REGISTER_DESC_WITH_BITS_PER_IRQ_SHARED(GICD_IPRIORITYR, >> vgic_mmio_read_priority, vgic_mmio_write_priority, NULL, NULL, > > Shouldn't we also set this uaccess_read cb for GICR_I{S,C}ACTIVER0? Duh. Yes, of course... M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel