hyperv/pcib: enable PCIe pass-through (a.k.a. Discrete Device Assignment)
The feature enables us to pass through physical PCIe devices to FreeBSD VM running on Hyper-V (Windows Server 2016) to get near-native performance with low CPU utilization. The patch implements a PCI bridge driver to support the feature: 1) The pcib driver talks to the host to discover device(s) and presents the device(s) to FreeBSD's pci driver via PCI configuration space (note: to access the configuration space, we don't use the standard I/O port 0xCF8/CFC method; instead, we use an MMIO-based method supplied by Hyper-V, which is very similar to the 0xCF8/CFC method). 2) The pcib driver allocates resources for the device(s) and initialize the related BARs, when the device driver's attach method is invoked; 3) The pcib driver talks to the host to create MSI/MSI-X interrupt remapping between the guest and the host; 4) The pcib driver supports device hot add/remove. Reviewed by: sephe Approved by: sephe (mentor) MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D8332
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=308725
@ -292,6 +292,7 @@ dev/hwpmc/hwpmc_uncore.c optional hwpmc
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dev/hwpmc/hwpmc_piv.c optional hwpmc
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dev/hwpmc/hwpmc_tsc.c optional hwpmc
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dev/hwpmc/hwpmc_x86.c optional hwpmc
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dev/hyperv/pcib/pcib.c optional hyperv
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dev/hyperv/netvsc/hn_nvs.c optional hyperv
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dev/hyperv/netvsc/hn_rndis.c optional hyperv
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dev/hyperv/netvsc/if_hn.c optional hyperv
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@ -249,6 +249,7 @@ dev/hwpmc/hwpmc_piv.c optional hwpmc
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dev/hwpmc/hwpmc_ppro.c optional hwpmc
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dev/hwpmc/hwpmc_tsc.c optional hwpmc
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dev/hwpmc/hwpmc_x86.c optional hwpmc
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dev/hyperv/pcib/pcib.c optional hyperv
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dev/hyperv/netvsc/hn_nvs.c optional hyperv
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dev/hyperv/netvsc/hn_rndis.c optional hyperv
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dev/hyperv/netvsc/if_hn.c optional hyperv
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sys/dev/hyperv/pcib/pcib.c
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1790
sys/dev/hyperv/pcib/pcib.c
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File diff suppressed because it is too large
Load Diff
12
sys/modules/hyperv/pcib/Makefile
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sys/modules/hyperv/pcib/Makefile
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# $FreeBSD$
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.PATH: ${.CURDIR}/../../../dev/hyperv/pcib \
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${.CURDIR}/../../../dev/hyperv/vmbus
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KMOD= vmbus_pcib
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SRCS= pcib.c
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SRCS+= bus_if.h device_if.h vmbus_if.h
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CFLAGS+= -I${.CURDIR}/../../../dev/hyperv/pcib
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.include <bsd.kmod.mk>
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