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Activation

GICv4.1 vLPI Passthrough

  1. Enable the SMMU in the BIOS.

    Choose BIOS > Advanced > MISC Config > Support SMMU and set Support SMMU to Enabled.

  2. GICv4.0 is configured in the BIOS by default. You need to manually change it to GICv4.1.

    Choose BIOS > Advanced > Processor Configuration > GIC Version and set GIC Version to 4.1.

  3. To activate GICv4.1, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    kvm-arm.vgic_v4_enable=1
  4. Confirm GICv4.1 is enabled by running the following command on the host:
    1
    dmesg | grep GIC

    If the following information is displayed, GICv4.1 is enabled:

    1
    kvm [1]: GICv4.1 support enabled

    With GICv4.1 enabled, running FIO stress tests within the VM that uses a passthrough device results in a high number of I/O interrupts inside the VM. Concurrently, the VFIO interrupts for the passthrough device on the host side show no activity.

GICv4.1 vSGI passthrough

  1. Enable the SMMU in the BIOS.

    Choose BIOS > Advanced > MISC Config > Support SMMU and set Support SMMU to Enabled.

  2. GICv4.0 is configured in the BIOS by default. You need to manually change it to GICv4.1.

    Choose BIOS > Advanced > Processor Configuration > GIC Version and set GIC Version to 4.1.

  3. To activate GICv4.1, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    kvm-arm.vgic_v4_enable=1
  4. Confirm GICv4.1 is enabled by running the following command on the host:
    1
    dmesg | grep GIC

    If the following information is displayed, GICv4.1 is enabled:

    1
    kvm [1]: GICv4.1 support enabled
  5. Check the dmesg logs of the guest OS. If the following information is displayed, the vSGI passthrough function has been enabled.
    1
    Enabling SGIs without active state

    When many IPIs are triggered inside the VM, vmtop reveals that the VM interrupt exits remain largely unchanged.

GICv4.1 Virtual Timer Passthrough

  1. GICv4.0 is configured in the BIOS by default. You need to manually change it to GICv4.1.

    Choose BIOS > Advanced > Processor Configuration > GIC Version and set GIC Version to 4.1.

  2. To activate GICv4.1, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    kvm-arm.vgic_v4_enable=1
  3. Confirm GICv4.1 is enabled by running the following command on the host:
    1
    dmesg | grep GIC

    If the following information is displayed, GICv4.1 is enabled:

    1
    kvm [1]: GICv4.1 support enabled
  4. To activate vtimer_irqbypass, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    kvm-arm.vtimer_irqbypass=1

    If the following information is displayed in the host OS dmesg output, vtimer is successfully enabled:

    1
    vtimer-irqbypass enabled

    The VM generates arch_timer interrupts, but the host side shows a vtimer interrupt count of 0.

GICv4.1 Virtual Device Interrupt Passthrough

  1. GICv4.0 is configured in the BIOS by default. You need to manually change it to GICv4.1.

    Choose BIOS > Advanced > Processor Configuration > GIC Version and set GIC Version to 4.1.

  2. To activate GICv4.1, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    kvm-arm.vgic_v4_enable=1
  3. Confirm GICv4.1 is enabled by running the following command on the host:
    1
    dmesg | grep GIC

    If the following information is displayed, GICv4.1 is enabled:

    1
    kvm [1]: GICv4.1 support enabled
  4. To reserve PCI numbers for virtual devices, append the following parameter to the kernel boot parameters in the host OS configuration file (for openEuler 22.03 LTS SP3, modify the line beginning with linux /vmlinuz-5.10.0-182.0.0.95.oe2203sp3.aarch64 root= in /boot/efi/EFI/openEuler/grub.cfg). Reboot the host OS to make the modification effective.
    start indicates the start number, and count indicates the PCI number count.
    kvm-arm.virt_msi_bypass=1 irqchip.gicv3_rsv_buses_start=30 irqchip.gicv3_rsv_buses_count=10

    During VM creation, if the following information is displayed in the dmesg output on the host OS, virtual device interrupt passthrough is enabled successfully.

    1
    Create shadow device

    Stress testing the virtual drive or virtual network card within the VM shows no significant change in the VM interrupt exit count, as monitored by vmtop.

Feature Activation Patches for non-openEuler Kernels

This feature is compatible with openEuler 22.03 LTS SP3 and later versions. Non-openEuler kernels require the application of specific activation patches.

Given the significant number of patches needed for non-openEuler kernels, you are advised to use openEuler 22.03 LTS SP3 or later to use this feature.

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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

Here is an example of applying patches using the git am command:

  1. Apply a patch using git am.
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    git am -s  /path/to/patch/Reinstall_old_memslots_if_arch_preparation_fails.patch
  2. A successful application message indicates that the patch is usable. The output will appear as:
    1
    Applying: KVM: Reinstall old memslots if arch preparation fails
  3. If an error occurs, identify the conflicting section in the patch based on the error message and manually adjust it based on the documentation:
    1
2
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. After the patches are applied and conflicts are resolved, recompile and install the kernel.
Parent topic: Usage