From: lantianyu1986@gmail.com
To: unlisted-recipients:; (no To-header on input)
Cc: Lan Tianyu <Tianyu.Lan@microsoft.com>,
arnd@arndb.de, bp@alien8.de, davem@davemloft.net,
devel@linuxdriverproject.org, gregkh@linuxfoundation.org,
haiyangz@microsoft.com, hpa@zytor.com,
iommu@lists.linux-foundation.org, joro@8bytes.org,
kys@microsoft.com, linux-kernel@vger.kernel.org,
mchehab+samsung@kernel.org, mingo@redhat.com,
nicolas.ferre@microchip.com, sashal@kernel.org,
sthemmin@microsoft.com, tglx@linutronix.de, x86@kernel.org,
michael.h.kelley@microsoft.com, vkuznets@redhat.com,
alex.williamson@redhat.com, dan.carpenter@oracle.com
Subject: [PATCH V4 0/3] x86/Hyper-V/IOMMU: Add Hyper-V IOMMU driver to support x2apic mode
Date: Mon, 11 Feb 2019 22:20:21 +0800 [thread overview]
Message-ID: <1549894824-26623-1-git-send-email-Tianyu.Lan@microsoft.com> (raw)
From: Lan Tianyu <Tianyu.Lan@microsoft.com>
On the bare metal, enabling X2APIC mode requires interrupt remapping
function which helps to deliver irq to cpu with 32-bit APIC ID.
Hyper-V doesn't provide interrupt remapping function so far and Hyper-V
MSI protocol already supports to deliver interrupt to the CPU whose
virtual processor index is more than 255. IO-APIC interrupt still has
8-bit APIC ID limitation.
This patchset is to add Hyper-V stub IOMMU driver in order to enable
X2APIC mode successfully in Hyper-V Linux guest. The driver returns X2APIC
interrupt remapping capability when X2APIC mode is available. X2APIC
destination mode is set to physical by PATCH 1 when X2APIC is available.
Hyper-V IOMMU driver will scan cpu 0~255 and set cpu into IO-APIC MAX cpu
affinity cpumask if its APIC ID is 8-bit. Driver creates a Hyper-V irq domain
to limit IO-APIC interrupts' affinity and make sure cpus assigned with IO-APIC
interrupt are in the scope of IO-APIC MAX cpu affinity.
Lan Tianyu (3):
x86/Hyper-V: Set x2apic destination mode to physical when x2apic is
available
HYPERV/IOMMU: Add Hyper-V stub IOMMU driver
MAINTAINERS: Add Hyper-V IOMMU driver into Hyper-V CORE AND DRIVERS
scope
MAINTAINERS | 1 +
arch/x86/kernel/cpu/mshyperv.c | 10 +++
drivers/iommu/Kconfig | 9 ++
drivers/iommu/Makefile | 1 +
drivers/iommu/hyperv-iommu.c | 194 +++++++++++++++++++++++++++++++++++++++++
drivers/iommu/irq_remapping.c | 3 +
drivers/iommu/irq_remapping.h | 1 +
7 files changed, 219 insertions(+)
create mode 100644 drivers/iommu/hyperv-iommu.c
--
2.7.4
next reply other threads:[~2019-02-11 14:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-11 14:20 lantianyu1986 [this message]
2019-02-11 14:20 ` [PATCH V4 1/3] x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available lantianyu1986
2019-02-21 17:00 ` Michael Kelley
2019-02-11 14:20 ` [PATCH V4 2/3] HYPERV/IOMMU: Add Hyper-V stub IOMMU driver lantianyu1986
2019-02-21 17:27 ` Michael Kelley
2019-02-22 12:14 ` Tianyu Lan
2019-02-11 14:20 ` [PATCH V4 3/3] MAINTAINERS: Add Hyper-V IOMMU driver into Hyper-V CORE AND DRIVERS scope lantianyu1986
2019-02-21 17:28 ` Michael Kelley
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