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特性使能

GICv4.1直通设备vLPI中断透传

  1. 通过BIOS使能SMMU。

    进入“BIOS->Advanced->MISC Config->Support SMMU”，设置“Support SMMU”为“Enabled”。

  2. BIOS默认配置是GICv4.0，需要手动设置为GICv4.1。

    进入“BIOS->Advanced->Processor Configuration->GIC Version”，设置“GIC Version”为“4.1”。

  3. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在“/boot/efi/EFI/openEuler/grub.cfg”）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来启动GICv4.1。添加完参数后重启Host OS生效。
    kvm-arm.vgic_v4_enable=1
  4. Host执行。
    1
    dmesg | grep GIC

    观察到回显有如下信息说明GICv4.1已经使能。

    1
    kvm [1]: GICv4.1 support enabled

    开启GICv4.1后，对直通设备的虚拟机内部进行FIO加压，可以观察到虚拟机内部有很多IO中断，但Host侧对应直通设备的VFIO中断为0。

GICv4.1 vSGI中断透传

  1. 通过BIOS使能SMMU。

    进入“BIOS->Advanced->MISC Config->Support SMMU”，设置“Support SMMU”为“Enabled”。

  2. BIOS默认配置是GICv4.0，需要手动设置为GICv4.1。

    进入“BIOS->Advanced->Processor Configuration->GIC Version”，设置“GIC Version”为“4.1”。

  3. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在/boot/efi/EFI/openEuler/grub.cfg）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来启动GICv4.1。添加完参数后重启Host OS生效。
    kvm-arm.vgic_v4_enable=1
  4. Host执行。
    1
    dmesg | grep GIC

    观察到回显有如下信息说明GICv4.1已经使能。

    1
    kvm [1]: GICv4.1 support enabled
  5. 检查GuestOS查看dmesg日志，观察到回显有如下信息说明vSGI透传功能已经使能。
    1
    Enabling SGIs without active state

    在虚拟机内部触发大量IPI中断，vmtop可以观察到虚拟机中断退出基本没有变化。

GICv4.1虚拟时钟中断透传

  1. BIOS默认配置是GICv4.0，需要手动设置为GICv4.1。

    进入“BIOS->Advanced->Processor Configuration->GIC Version”，设置“GIC Version”为“4.1”。

  2. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在“/boot/efi/EFI/openEuler/grub.cfg”）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来启动GICv4.1。添加完参数后重启Host OS生效。
    kvm-arm.vgic_v4_enable=1
  3. Host执行。
    1
    dmesg | grep GIC

    观察到回显有如下信息说明GICv4.1已经使能。

    1
    kvm [1]: GICv4.1 support enabled
  4. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在“/boot/efi/EFI/openEuler/grub.cfg”）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来开启vtimer_irqbypass。添加完参数后重启Host OS生效。
    kvm-arm.vtimer_irqbypass=1

    HostOS dmesg观察到回显有如下信息说明vtimer使能成功。

    1
    vtimer-irqbypass enabled

    此时虚拟机内部有arch_timer中断，Host侧观察vtimer中断个数为0。

GICv4.1虚拟设备中断透传

  1. BIOS默认配置是GICv4.0，需要手动设置为GICv4.1。

    进入“BIOS->Advanced->Processor Configuration->GIC Version”，设置“GIC Version”为“4.1”。

  2. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在/boot/efi/EFI/openEuler/grub.cfg）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来启动GICv4.1。添加完参数后重启Host OS生效。
    kvm-arm.vgic_v4_enable=1
  3. Host执行。
    1
    dmesg | grep GIC

    观察到回显有如下信息说明GICv4.1已经使能。

    1
    kvm [1]: GICv4.1 support enabled
  4. 在Host OS的系统引导配置文件grub.cfg（以openEuler为例，该文件在/boot/efi/EFI/openEuler/grub.cfg）中添加如下参数至对应内核（此处以openEuler 22.03 LTS SP3为例）的“linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root=”行尾来给虚拟设备预留PCI号。添加完参数后重启Host OS生效。
    其中start为起始编号，count为PCI号数量。
    kvm-arm.virt_msi_bypass=1 irqchip.gicv3_rsv_buses_start=30 irqchip.gicv3_rsv_buses_count=10

    创建虚拟机时，Host OS上dmesg观察到回显有如下信息说明虚拟设备中断卸载使能成功。

    1
    Create shadow device

    在虚拟机内部对虚拟磁盘或虚拟网卡进行加压，vmtop可以观察到vm的中断退出次数基本没有变化。

非openEuler内核使能补丁

该特性支持openEuler 22.03-LTS-SP3及以上的操作系统版本，非openEuler内核需要合入如下使能补丁。

由于非openEuler内核需要合入的使能补丁数量比较大，建议使用openEuler 22.03-LTS-SP3及以上的操作系统使能该特性。

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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f8af4519dfb6156045173f38cbd528c043fb25e2
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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d9c3872cd2f86b7295446e35b4801270669d2960
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7bdabad12784cf03d2ba36fc7dec66d4f2bb3174
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dab4fe3bf6dd87a7d6dbab2c929afd1ef62a120b
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=eeaa4b24e5032707ee4286b6a2bcc5fb85eba4a4
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=96806229ca033f85310bc5c203410189f8a1d2ee
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4b2dfe1e7799d0e20b55711dfcc45d2ad35ff46e
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=31dbb6b1d025506b3b8b8b74e9b697df47b9f696
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=46135d6f878ab00261d4a2082d620bfb41019aab
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=12df7429213abbfa9632ab7db94f629ec309a58b
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=80317fe4a65375fae668672a1398a0fb73eb9023
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f66b7b151e00427168409f8c1857970e926b1e27
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef3691683d7bfd0a2acf48812e4ffe894f10bfa8
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=79a7f77b9b154d572bd9d2f1eecf58c4d018d8e2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=57e3cebd022fbc035dcf190ac789fd2ffc747f5b
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=af27e41612ec7e5b4783f589b753a7c31a37aac8
https://gitee.com/openeuler/kernel/commit/3662006884d195d0ccbaa30818eea04dc9928716
https://gitee.com/openeuler/kernel/commit/7b9b5990e5f2d5d14cbb782c9f5ae88a30932fe4
https://gitee.com/openeuler/kernel/commit/ccd1c07f6d9b662657d044e4525a1964ec5afb4e
https://gitee.com/openeuler/kernel/commit/8544c8e14fec52453d0b38a4b6bdf12345e71755
https://gitee.com/openeuler/kernel/pulls/3220/commits
https://gitee.com/openeuler/kernel/commit/539979b6ec62f7bba40b0452b0574a0f4ec4fe4e
https://gitee.com/openeuler/kernel/commit/ba1ed9e17b581c9a204ec1d72d40472dd8557edd
https://gitee.com/openeuler/kernel/commit/41ee52ecbcdc98eb2a03241923b1a7d46f476bb3
https://gitee.com/openeuler/kernel/commit/43c7519a5d563325b19210009d04643fedd96204

合入补丁示例，以git am方式合入补丁为例：

  1. 以git am方式合入补丁。
    1
    git am -s  /path/to/patch/Reinstall_old_memslots_if_arch_preparation_fails.patch
  2. 若只提示applying成功信息，则补丁可用，回显信息如下。
    1
    Applying：KVM：Reinstall old memslots if arch preparation fails
  3. 若有如下报错，则需根据错误提示在patch中找到无法合入部分，根据提示到相应文档中手动修改。
    1
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3
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    Applying：KVM：Reinstall old memslots if arch preparation fails
error：patch failed：virt/kvm/kvm_main.c:1117
error：virt/kvm/kvm_main.c：patch does not apply
Patch failed at 0001 KVM：Reinstall old memslots if arch preparation fails
  4. 补丁合入并解决冲突后，重新编译安装内核。
父主题： 特性使用