linux-kernel - Re: [RFC PATCH 1/4] KVM: selftests: Add support for creating non-default type VMs

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Message-ID: <YP82iIe3vM/+fRAh@google.com>
Date:   Mon, 26 Jul 2021 22:26:16 +0000
From:   David Matlack <dmatlack@...gle.com>
To:     Erdem Aktas <erdemaktas@...gle.com>
Cc:     linux-kselftest@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Peter Gonda <pgonda@...gle.com>, Marc Orr <marcorr@...gle.com>,
        Sagi Shahar <sagis@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Andrew Jones <drjones@...hat.com>,
        Ben Gardon <bgardon@...gle.com>, Peter Xu <peterx@...hat.com>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Eric Auger <eric.auger@...hat.com>,
        Yanan Wang <wangyanan55@...wei.com>,
        Aaron Lewis <aaronlewis@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Oliver Upton <oupton@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Peter Shier <pshier@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Zhenzhong Duan <zhenzhong.duan@...el.com>,
        "Maciej S. Szmigiero" <maciej.szmigiero@...cle.com>,
        Like Xu <like.xu@...ux.intel.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:KERNEL VIRTUAL MACHINE (KVM)" <kvm@...r.kernel.org>
Subject: Re: [RFC PATCH 1/4] KVM: selftests: Add support for creating
 non-default type VMs

On Mon, Jul 26, 2021 at 11:37:54AM -0700, Erdem Aktas wrote:
> Currently vm_create function only creates KVM_X86_LEGACY_VM type VMs.
> Changing the vm_create function to accept type parameter to create
> new VM types.
> 
> Signed-off-by: Erdem Aktas <erdemaktas@...gle.com>
> Reviewed-by: Sean Christopherson <seanjc@...gle.com>
> Reviewed-by: Peter Gonda <pgonda@...gle.com>
> Reviewed-by: Marc Orr <marcorr@...gle.com>
> Reviewed-by: Sagi Shahar <sagis@...gle.com>

Reviewed-by: David Matlack <dmatlack@...gle.com>

(aside from the nit below)

> ---
>  .../testing/selftests/kvm/include/kvm_util.h  |  1 +
>  tools/testing/selftests/kvm/lib/kvm_util.c    | 29 +++++++++++++++++--
>  2 files changed, 27 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
> index d53bfadd2..c63df42d6 100644
> --- a/tools/testing/selftests/kvm/include/kvm_util.h
> +++ b/tools/testing/selftests/kvm/include/kvm_util.h
> @@ -88,6 +88,7 @@ int vcpu_enable_cap(struct kvm_vm *vm, uint32_t vcpu_id,
>  void vm_enable_dirty_ring(struct kvm_vm *vm, uint32_t ring_size);
>  
>  struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm);
> +struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm, int type);

nit: Consider using a more readable function name such as
vm_create_with_type().

>  void kvm_vm_free(struct kvm_vm *vmp);
>  void kvm_vm_restart(struct kvm_vm *vmp, int perm);
>  void kvm_vm_release(struct kvm_vm *vmp);
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index e5fbf16f7..70caa3882 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -180,13 +180,36 @@ _Static_assert(sizeof(vm_guest_mode_params)/sizeof(struct vm_guest_mode_params)
>   * Return:
>   *   Pointer to opaque structure that describes the created VM.
>   *
> - * Creates a VM with the mode specified by mode (e.g. VM_MODE_P52V48_4K).
> + * Wrapper VM Create function to create a VM with default type (0).
> + */
> +struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
> +{
> +	return __vm_create(mode, phy_pages, perm, 0);
> +}
> +
> +/*
> + * VM Create with a custom type
> + *
> + * Input Args:
> + *   mode - VM Mode (e.g. VM_MODE_P52V48_4K)
> + *   phy_pages - Physical memory pages
> + *   perm - permission
> + *   type - VM type
> + *
> + * Output Args: None
> + *
> + * Return:
> + *   Pointer to opaque structure that describes the created VM.
> + *
> + * Creates a VM with the mode specified by mode (e.g. VM_MODE_P52V48_4K) and the
> + * type specified in type (e.g. KVM_X86_LEGACY_VM, KVM_X86_TDX_VM ...).
>   * When phy_pages is non-zero, a memory region of phy_pages physical pages
>   * is created and mapped starting at guest physical address 0.  The file
>   * descriptor to control the created VM is created with the permissions
>   * given by perm (e.g. O_RDWR).
>   */
> -struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
> +struct kvm_vm *__vm_create(enum vm_guest_mode mode, uint64_t phy_pages,
> +			    int perm, int type)
>  {
>  	struct kvm_vm *vm;
>  
> @@ -200,7 +223,7 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
>  	INIT_LIST_HEAD(&vm->userspace_mem_regions);
>  
>  	vm->mode = mode;
> -	vm->type = 0;
> +	vm->type = type;
>  
>  	vm->pa_bits = vm_guest_mode_params[mode].pa_bits;
>  	vm->va_bits = vm_guest_mode_params[mode].va_bits;
> -- 
> 2.32.0.432.gabb21c7263-goog
>