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

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Date:   Wed, 04 Aug 2021 17:45:43 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Erdem Aktas <erdemaktas@...gle.com>,
        linux-kselftest@...r.kernel.org
Cc:     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>,
        David Matlack <dmatlack@...gle.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 Wed, 2021-08-04 at 22:42 +0800, Xiaoyao Li wrote:
> On 8/4/2021 10:24 PM, Maxim Levitsky wrote:
> > On Wed, 2021-08-04 at 14:09 +0800, Xiaoyao Li wrote:
> > > On 7/27/2021 2:37 AM, 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>
> > > > ---
> > > >    .../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);
> > > >    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).
> > > 
> > > Can we pass KVM_X86_LEGACY_VM (whatever name when it's upstreamed)
> > > instead of 0?
> > 
> > To be honest I would prefer this to be called something like KVM_X86_STANDARD_VM,
> > or something.
> > 
> > I don't think that normal unencrypted virtualization is already legacy, even if TDX
> > docs claim that.
> 
> I'm not proposing to use this specific name introduced in TDX RFC 
> series, but proposing to use the name defined in KVM in the future 
> instead of hard-coded 0.
> 
> Yes, KVM_X86_STANDARD_VM or KVM_X86_NORMAL_VM (proposed by Paolo) is 
> better than KVM_X86_LEGACY_VM.

KVM_X86_NORMAL_VM is a very good name IMHO as well.
Thanks!

Best regards,
	Maxim Levitsky

> 
> > Just my personal opinion.
> > 
> > Best regards,
> > 	Maxim Levitsky
> > 
> > > > + */
> > > > +struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
> > > > +{
> > > > +	return __vm_create(mode, phy_pages, perm, 0);
> > > > +}
> > > > +