Messages in this thread |  | | From | weiqi <> | Subject | [PATCH 0/2] page hinting add passthrough support | Date | Tue, 7 Jan 2020 22:46:37 +0800 |
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From: wei qi <weiqi4@huawei.com>
I just implemented dynamically updating the iommu table to support pass-through, It seen to work fine.
Test: start a 4G vm with 2M hugetlb and ixgbevf passthrough, GuestOS: linux-5.2.6 + (mm / virtio: Provide support for free page reporting) HostOS: 5.5-rc4 Host: Intel(R) Xeon(R) Gold 6161 CPU @ 2.20GHz
after enable page hinting, free pages at GuestOS can be free at host.
before, # cat /sys/devices/system/node/node*/hugepages/hugepages-2048kB/free_hugepages 5620 5620 after start VM, # numastat -c qemu
Per-node process memory usage (in MBs) PID Node 0 Node 1 Total --------------- ------ ------ ----- 24463 (qemu_hotr 6 6 12 24479 (qemu_tls_ 0 8 8 70718 (qemu-syst 58 539 597 --------------- ------ ------ ----- Total 64 553 616 # cat /sys/devices/system/node/node*/hugepages/hugepages-2048kB/free_hugepages 5595 5366
the modify at qemu, +int kvm_discard_range(struct kvm_discard_msg discard_msg) +{ + return kvm_vm_ioctl(kvm_state, KVM_DISCARD_RANGE, &discard_msg); +}
static void virtio_balloon_handle_report(VirtIODevice *vdev, VirtQueue *vq) { .................. + discard_msg.in_addr = elem->in_addr[i]; + discard_msg.iov_len = elem->in_sg[i].iov_len;
ram_block_discard_range(rb, ram_offset, size); + kvm_discard_range(discard_msg);
then, further test network bandwidth, performance seem ok. Is there any hidden problem in this implementation? And, is there plan to support pass-throughyour?
wei qi (2): vfio: add mmap/munmap API for page hinting KVM: add support for page hinting
arch/x86/kvm/mmu/mmu.c | 79 ++++++++++++++++++++ arch/x86/kvm/x86.c | 96 ++++++++++++++++++++++++ drivers/vfio/vfio.c | 109 ++++++++++++++++++++++++++++ drivers/vfio/vfio_iommu_type1.c | 157 +++++++++++++++++++++++++++++++++++++++- include/linux/kvm_host.h | 41 +++++++++++ include/linux/vfio.h | 17 ++++- include/uapi/linux/kvm.h | 7 ++ virt/kvm/vfio.c | 11 --- 8 files changed, 503 insertions(+), 14 deletions(-)
-- 1.8.3.1
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