From: Pavel Fedin <p.fedin@samsung.com>
To: 'Eric Auger' <eric.auger@linaro.org>,
eric.auger@st.com, christoffer.dall@linaro.org,
marc.zyngier@arm.com, andre.przywara@arm.com,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: patches@linaro.org
Subject: RE: [RFC 0/6] KVM: arm/arm64: gsi routing support
Date: Fri, 19 Jun 2015 09:37:30 +0300 [thread overview]
Message-ID: <011e01d0aa5a$6b14fae0$413ef0a0$@samsung.com> (raw)
In-Reply-To: <1434649258-27065-1-git-send-email-eric.auger@linaro.org>
Hello!
> The series therefore allows and mandates the usage of KVM_SET_GSI_ROUTING
> ioctl along with KVM_IRQFD. If the userspace does not define any routing
> table, no irqfd injection can happen. The user-space can use
> KVM_CAP_IRQ_ROUTING to detect whether a routing table is needed.
Yesterday, half-sleeping in the train back home, i've got a simple idea how to resolve
conflicts with existing static GSI->SPI routing without bringing in any more
inconsistencies.
So far, in current implementation GSI is an SPI index (let alone KVM_IRQ_LINE, because
it's already another story on ARM). In order to maintain this convention we could simply
implement default routing which sets all GSIs to corresponding SPI pins. So, if the
userland never cares about KVM_SET_GSI_ROUTING, everything works as before. But it will be
possible to re-route GSIs to MSI. It will perfectly work because SPI signaling is used
with GICv2m, and MSI with GICv3(+), which cannot be used at the same time.
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia
next prev parent reply other threads:[~2015-06-19 6:37 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-18 17:40 [RFC 0/6] KVM: arm/arm64: gsi routing support Eric Auger
2015-06-18 17:40 ` [RFC 1/6] KVM: api: add kvm_irq_routing_extended_msi Eric Auger
2015-06-22 16:32 ` Andre Przywara
2015-06-23 7:36 ` Eric Auger
2015-06-18 17:40 ` [RFC 2/6] KVM: kvm_host: add kvm_extended_msi Eric Auger
2015-06-18 17:40 ` [RFC 3/6] KVM: irqchip: convey devid to kvm_set_msi Eric Auger
2015-06-18 17:40 ` [RFC 4/6] KVM: arm/arm64: enable irqchip routing Eric Auger
2015-06-18 17:53 ` Marc Zyngier
2015-06-18 18:00 ` Eric Auger
2015-06-18 18:07 ` Marc Zyngier
2015-06-18 17:40 ` [RFC 5/6] KVM: arm/arm64: enable MSI routing Eric Auger
2015-06-18 17:40 ` [RFC 6/6] KVM: arm: implement kvm_set_msi by gsi direct mapping Eric Auger
2015-06-19 6:37 ` Pavel Fedin [this message]
2015-06-22 8:31 ` [RFC 0/6] KVM: arm/arm64: gsi routing support Eric Auger
2015-06-22 8:40 ` Andre Przywara
2015-06-22 9:21 ` Eric Auger
2015-06-23 7:38 ` Pavel Fedin
2015-06-23 7:50 ` Eric Auger
2015-06-23 8:50 ` Pavel Fedin
2015-06-23 9:44 ` Eric Auger
2015-06-23 9:03 ` Andre Przywara
2015-06-23 9:33 ` Eric Auger
2015-06-23 12:53 ` Eric Auger
2015-06-24 12:20 ` Pavel Fedin
2015-06-24 13:03 ` Eric Auger
2015-06-25 8:46 ` Pavel Fedin
2015-06-26 16:17 ` Eric Auger
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