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Re: [Qemu-arm] [Qemu-devel] [RFC 0/5] arm: Exclude reserved memory regio
From: |
Auger Eric |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [RFC 0/5] arm: Exclude reserved memory regions of iommu to avoid |
Date: |
Mon, 13 Nov 2017 21:01:34 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
Hello Zhu,
On 13/11/2017 13:29, address@hidden wrote:
> From: Zhu Yijun <address@hidden>
>
> With kernel 4.11, iommu/smmu will populate the MSI IOVA reserved window and
> PCI reserved window which has to be excluded from Guest iova allocations.
>
> And on certain HiSilicon platforms (hip06/hip07), the GIC ITS and PCIe RC
> deviates from the standard implementation will reserve the hw msi regions in
> the smmu-v3 driver which means these address regions will not be translated.
>
> https://www.spinics.net/lists/linux-pci/msg65125.html
>
> On such platforms, reserved memory regions will export like this:
>
> root:~# cat /sys/kernel/iommu_groups/7/reserved_regions
> 0x00000000a8800000 0x00000000affeffff reserved
> 0x00000000c6000000 0x00000000c601ffff msi
>
> However, it falls within the Qemu default virtual memory address space.
>
> Take a look at hw/arm/virt.c:
>
> [VIRT_MEM] = { 0x40000000, RAMLIMIT_BYTES },
> . . .
>
> memory_region_allocate_system_memory(ram, NULL, "mach-virt.ram",
> machine->ram_size);
> memory_region_add_subregion(sysmem, vms->memmap[VIRT_MEM].base, ram);
>
> So suppose we allocate 4GB mem to a VM, there is a chance that the reserved
> regions will get allocated for a Guest VF DMA iova and it will fail.
>
> This patchset create holes in the Qemu RAM address space which exclude
> the sysfs exported regions.
>
>
> Zhu Yijun (5):
> hw/vfio: Add function for getting reserved_region of device iommu
> group
> hw/arm/virt: Enable dynamic generation of guest RAM memory regions
> hw/arm: add scattered RAM memory region support
> hw/arm/boot: set fdt size cell of memory node from mem_list
> hw/arm/virt-acpi-build: Build srat table according to mem_list
I have not received all the patches of this series. I miss 2, 4, 5.
Looking at
https://lists.nongnu.org/archive/html/qemu-devel/2017-11/threads.html#02198,
I don't see them either.
Thanks
Eric
>
> hw/arm/boot.c | 155
> +++++++++++++++++++++++++++++++-----------
> hw/arm/virt-acpi-build.c | 40 +++++++++--
> hw/arm/virt.c | 120 ++++++++++++++++++++++++++++++--
> hw/vfio/common.c | 67 ++++++++++++++++++
> hw/vfio/pci.c | 2 +
> hw/vfio/platform.c | 2 +
> include/exec/memory.h | 7 ++
> include/hw/arm/arm.h | 1 +
> include/hw/arm/virt.h | 1 +
> include/hw/vfio/vfio-common.h | 3 +
> 10 files changed, 347 insertions(+), 51 deletions(-)
>
- [Qemu-arm] [RFC 0/5] arm: Exclude reserved memory regions of iommu to avoid, zhuyijun, 2017/11/13
- [Qemu-arm] [RFC 0/5] arm: Exclude reserved memory regions of iommu to avoid, zhuyijun, 2017/11/13
- [Qemu-arm] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, zhuyijun, 2017/11/13
- Re: [Qemu-arm] [Qemu-devel] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, Alex Williamson, 2017/11/14
- Re: [Qemu-arm] [Qemu-devel] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, Shameerali Kolothum Thodi, 2017/11/15
- Re: [Qemu-arm] [Qemu-devel] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, Alex Williamson, 2017/11/15
- Re: [Qemu-arm] [Qemu-devel] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, Shameerali Kolothum Thodi, 2017/11/20
- Re: [Qemu-arm] [Qemu-devel] [RFC 1/5] hw/vfio: Add function for getting reserved_region of device iommu group, Alex Williamson, 2017/11/20