linux-kernel - Re: [PATCH 1/2] KVMM: export needed symbols

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Date:   Mon, 18 May 2020 08:41:47 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Anastassios Nanos <ananos@...ificus.co.uk>
Cc:     kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org, James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 1/2] KVMM: export needed symbols

On 2020-05-18 07:58, Anastassios Nanos wrote:
> Expose a set of KVM functions to the kernel, in order to be
> able to spawn a VM instance without assistance from user-space.
> To handle a guest instance, the system needs access to the following
> functions:
> 
>     kvm_arch_vcpu_run_map_fp
>     kvm_arch_vcpu_ioctl_get_regs
>     kvm_arch_vcpu_ioctl_set_regs
>     kvm_arm_get_reg
>     kvm_arm_set_reg
>     kvm_arch_vcpu_ioctl_get_sregs
>     kvm_arch_vcpu_ioctl_set_sregs
>     kvm_vcpu_preferred_target
>     kvm_vcpu_ioctl_set_cpuid2
>     kvm_vcpu_ioctl_get_cpuid2
>     kvm_dev_ioctl_get_cpuid
>     kvm_arch_vcpu_ioctl_run
>     kvm_arch_vcpu_ioctl_get_regs
>     kvm_arch_vcpu_ioctl_set_regs
>     kvm_arch_vcpu_ioctl_get_sregs
>     kvm_arch_vcpu_ioctl_set_sregs
>     kvm_vcpu_initialized
>     kvm_arch_vcpu_ioctl_run
>     kvm_arch_vcpu_ioctl_vcpu_init
>     kvm_coalesced_mmio_init
>     kvm_create_vm
>     kvm_destroy_vm
>     kvm_vm_ioctl_set_memory_region
>     kvm_vm_ioctl_create_vcpu
> 
> Signed-off-by: Anastassios Nanos <ananos@...ificus.co.uk>
> Signed-off-by: Charalampos Mainas <cmainas@...ificus.co.uk>
> Signed-off-by: Konstantinos Papazafeiropoulos <kostis@...ificus.co.uk>
> Signed-off-by: Stratos Psomadakis <psomas@...ificus.co.uk>
> ---
>  arch/arm64/include/asm/kvm_host.h |  6 ++++
>  arch/arm64/kvm/fpsimd.c           |  6 ++++
>  arch/arm64/kvm/guest.c            | 48 +++++++++++++++++++++++++++++++
>  arch/x86/kvm/cpuid.c              | 25 ++++++++++++++++
>  arch/x86/kvm/x86.c                | 31 ++++++++++++++++++++
>  include/linux/kvm_host.h          | 24 ++++++++++++++++
>  virt/kvm/arm/arm.c                | 18 ++++++++++++
>  virt/kvm/coalesced_mmio.c         |  6 ++++
>  virt/kvm/kvm_main.c               | 23 +++++++++++++++
>  9 files changed, 187 insertions(+)

In general, we don't export synbols without a user in the tree.
And if/when we do, the sensible thing to do would be to export
them as GPL only.

         M.
-- 
Jazz is not dead. It just smells funny...