From: Pavel Fedin <p.fedin@samsung.com>
To: 'Eric Auger' <eric.auger@linaro.org>,
'Marc Zyngier' <marc.zyngier@arm.com>,
'Andre Przywara' <Andre.Przywara@arm.com>,
christoffer.dall@linaro.org
Cc: kvm@vger.kernel.org
Subject: RE: IRQFD support with GICv3 ITS (WAS: RE: [PATCH 00/13] arm64: KVM: GICv3 ITS emulation)
Date: Wed, 17 Jun 2015 12:21:16 +0300 [thread overview]
Message-ID: <011601d0a8de$f75b8280$e6128780$@samsung.com> (raw)
In-Reply-To: <05da01d0a392$58bf5030$0a3df090$@samsung.com>
PING!
The discussion has suddenly stopped... What is our status? Is ITS v2 patch being
developed, or what? And do we have some conclusion on irqfd ?
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia
> -----Original Message-----
> From: kvm-owner@vger.kernel.org [mailto:kvm-owner@vger.kernel.org] On Behalf Of Pavel
> Fedin
> Sent: Wednesday, June 10, 2015 6:30 PM
> To: 'Eric Auger'; 'Marc Zyngier'; 'Andre Przywara'; christoffer.dall@linaro.org
> Cc: kvmarm@lists.cs.columbia.edu; linux-arm-kernel@lists.infradead.org;
kvm@vger.kernel.org
> Subject: RE: IRQFD support with GICv3 ITS (WAS: RE: [PATCH 00/13] arm64: KVM: GICv3 ITS
> emulation)
>
> Hi!
>
> > indeed in newly added qemu kvm-all.c kvm_arch_msi_data_to_gsi we could
> > call a new ioctl that translates the data + deviceid? into an LPI and
> > program irqfd with that LPI. This is done once when setting irqfd up.
> > This also means extending irqfd support to lpi injection, gsi being the
> > LPI index if gsi >= 8192. in that case we continue using
> > kvm_gsi_direct_mapping and gsi still is an IRQ index.
>
> This is exactly what i have done in my kernel + qemu. I have added a new KVM capability
> and then in qemu i do this:
> --- cut ---
> if (kvm_gsi_kernel_mapping()) {
> struct kvm_msi msi;
>
> msi.address_lo = (uint32_t)msg.address;
> msi.address_hi = msg.address >> 32;
> msi.data = le32_to_cpu(msg.data);
> memset(msi.pad, 0, sizeof(msi.pad));
>
> if (dev) {
> msi.devid = (pci_bus_num(dev->bus) << 8) | dev->devfn;
> msi.flags = KVM_MSI_VALID_DEVID;
> } else {
> msi.devid = 0;
> msi.flags = 0;
> }
>
> return kvm_vm_ioctl(s, KVM_TRANSLATE_MSI, &msi);
> }
> --- cut ---
> KVM_TRANSLATE_MSI returns an LPI number. This seemed to be the simplest and fastest
thing
> to do.
> If someone is interested, i could prepare an RFC patch series for this, which would
apply
> on top of Andre's ITS implementation.
>
> Kind regards,
> Pavel Fedin
> Expert Engineer
> Samsung Electronics Research center Russia
>
>
> --
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next prev parent reply other threads:[~2015-06-17 9:21 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 8:31 IRQFD support with GICv3 ITS (WAS: RE: [PATCH 00/13] arm64: KVM: GICv3 ITS emulation) Pavel Fedin
2015-06-10 8:31 ` Pavel Fedin
2015-06-10 13:58 ` Eric Auger
2015-06-10 13:58 ` Eric Auger
2015-06-10 15:30 ` Pavel Fedin
2015-06-10 15:30 ` Pavel Fedin
2015-06-17 9:21 ` Pavel Fedin [this message]
2015-06-17 9:34 ` Marc Zyngier
2015-06-17 10:00 ` Pavel Fedin
2015-06-17 11:02 ` Andre Przywara
2015-06-17 11:46 ` Pavel Fedin
2015-06-18 6:35 ` Eric Auger
2015-06-18 14:19 ` Pavel Fedin
2015-06-10 15:38 ` Pavel Fedin
2015-06-10 15:38 ` Pavel Fedin
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