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From: Andrew Jones <drjones@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ben Gardon <bgardon@google.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-kselftest@vger.kernel.org,
	Cannon Matthews <cannonmatthews@google.com>,
	Peter Xu <peterx@redhat.com>, Peter Shier <pshier@google.com>,
	Oliver Upton <oupton@google.com>,
	Marc Zyngier <Marc.Zyngier@arm.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>
Subject: Re: [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to aarch64 and s390x
Date: Fri, 24 Jan 2020 10:35:43 +0100
Message-ID: <20200124093543.m5oqo7fnjnc2scko@kamzik.brq.redhat.com> (raw)
In-Reply-To: <4dbb6d1b-3162-d9b3-4ebb-5e4061776bb6@redhat.com>

On Fri, Jan 24, 2020 at 10:03:08AM +0100, Paolo Bonzini wrote:
> CCing Marc, Conny and Christian (plus Thomas and Drew who were already
> in the list) for review.
> 
> Thanks,
> 
> Paolo
> 
> On 23/01/20 19:04, Ben Gardon wrote:
> > Currently vcpu_args_set is only implemented for x86. This makes writing
> > tests with multiple vCPUs difficult as each guest vCPU must either a.)
> > do the same thing or b.) derive some kind of unique token from it's
> > registers or the architecture. To simplify the process of writing tests
> > with multiple vCPUs for s390 and aarch64, add set args functions for
> > those architectures.

It'd be nice to keep the separate architecture changes in separate
patches. Otherwise I can't really give an r-b.

> > 
> > Signed-off-by: Ben Gardon <bgardon@google.com>
> > ---
> >  .../selftests/kvm/lib/aarch64/processor.c     | 33 +++++++++++++++++
> >  .../selftests/kvm/lib/s390x/processor.c       | 35 +++++++++++++++++++
> >  2 files changed, 68 insertions(+)
> > 
> > diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > index 86036a59a668e..a2ff90a75f326 100644
> > --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> > @@ -333,3 +333,36 @@ void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
> >  {
> >  	aarch64_vcpu_add_default(vm, vcpuid, NULL, guest_code);
> >  }
> > +
> > +/* VM VCPU Args Set
> > + *
> > + * Input Args:
> > + *   vm - Virtual Machine
> > + *   vcpuid - VCPU ID
> > + *   num - number of arguments
> > + *   ... - arguments, each of type uint64_t
> > + *
> > + * Output Args: None
> > + *
> > + * Return: None
> > + *
> > + * Sets the first num function input arguments to the values
> > + * given as variable args.  Each of the variable args is expected to
> > + * be of type uint64_t. The registers set by this function are r0-r7.
> > + */

lib/aarch64/processor.c so far doesn't have big function headers like
this. Also, since this function is common for all architectures [now],
I feel like the documentation should be in common code - so in the header
file.

> > +void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
> > +{
> > +	va_list ap;
> > +
> > +	TEST_ASSERT(num >= 1 && num <= 8, "Unsupported number of args,\n"
> > +		    "  num: %u\n",
> > +		    num);

Weird line breaking. I see it came from the x86 implementation, but it's
weird there too... Personally I'd just put it all on one line, because
my vt100 died two decades ago.

> > +
> > +	va_start(ap, num);
> > +
> > +	for (i = 0; i < num; i++)
> > +		set_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[num]),
                                                             ^^ should be 'i'

> > +			va_arg(ap, uint64_t));

nit: I'd use {} because of the line break. Or just not break the line and
bust the 80 char "limit" (RIP vt100).

Thanks,
drew

> > +
> > +	va_end(ap);
> > +}
> > diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > index 32a02360b1eb0..680f37be9dbc9 100644
> > --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> > +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> > @@ -269,6 +269,41 @@ void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
> >  	run->psw_addr = (uintptr_t)guest_code;
> >  }
> >  
> > +/* VM VCPU Args Set
> > + *
> > + * Input Args:
> > + *   vm - Virtual Machine
> > + *   vcpuid - VCPU ID
> > + *   num - number of arguments
> > + *   ... - arguments, each of type uint64_t
> > + *
> > + * Output Args: None
> > + *
> > + * Return: None
> > + *
> > + * Sets the first num function input arguments to the values
> > + * given as variable args.  Each of the variable args is expected to
> > + * be of type uint64_t. The registers set by this function are r2-r6.
> > + */
> > +void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
> > +{
> > +	va_list ap;
> > +	struct kvm_regs regs;
> > +
> > +	TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n"
> > +		    "  num: %u\n",
> > +		    num);
> > +
> > +	va_start(ap, num);
> > +	vcpu_regs_get(vm, vcpuid, &regs);
> > +
> > +	for (i = 0; i < num; i++)
> > +		regs.gprs[i + 2] = va_arg(ap, uint64_t);
> > +
> > +	vcpu_regs_set(vm, vcpuid, &regs);
> > +	va_end(ap);
> > +}
> > +
> >  void vcpu_dump(FILE *stream, struct kvm_vm *vm, uint32_t vcpuid, uint8_t indent)
> >  {
> >  	struct vcpu *vcpu = vm->vcpu_head;
> > 
> 


  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 18:04 [PATCH v4 00/10] Create a userfaultfd demand paging test Ben Gardon
2020-01-23 18:04 ` [PATCH v4 01/10] KVM: selftests: Create a " Ben Gardon
2020-01-24  9:49   ` Andrew Jones
2020-01-27  9:18   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 02/10] KVM: selftests: Add demand paging content to the " Ben Gardon
2020-01-23 18:04 ` [PATCH v4 03/10] KVM: selftests: Add configurable demand paging delay Ben Gardon
2020-01-23 18:04 ` [PATCH v4 04/10] KVM: selftests: Add memory size parameter to the demand paging test Ben Gardon
2020-01-24 10:01   ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 05/10] KVM: selftests: Pass args to vCPU in global vCPU args struct Ben Gardon
2020-01-23 18:04 ` [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to aarch64 and s390x Ben Gardon
2020-01-24  9:03   ` Paolo Bonzini
2020-01-24  9:35     ` Andrew Jones [this message]
2020-01-24  9:44       ` Paolo Bonzini
2020-01-24 10:45       ` Andrew Jones
2020-01-24 18:33     ` Christian Borntraeger
2020-01-25  9:34   ` Paolo Bonzini
2020-01-27  8:38     ` Andrew Jones
2020-01-27  9:01   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 07/10] KVM: selftests: Support multiple vCPUs in demand paging test Ben Gardon
2020-01-24 10:16   ` Andrew Jones
2020-01-24 10:49   ` Andrew Jones
2020-01-25  9:39     ` Paolo Bonzini
2020-01-27  8:39       ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 08/10] KVM: selftests: Time guest demand paging Ben Gardon
2020-01-24 10:21   ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 09/10] KVM: selftests: Stop memslot creation in KVM internal memslot region Ben Gardon
2020-01-24  8:58   ` Paolo Bonzini
2020-01-24 18:41     ` Ben Gardon
2020-01-25  9:37       ` Paolo Bonzini
2020-01-27 17:28         ` Ben Gardon
2020-01-23 18:04 ` [PATCH v4 10/10] KVM: selftests: Move memslot 0 above KVM internal memslots Ben Gardon
2020-01-24  9:01   ` Paolo Bonzini
2020-01-24 18:53     ` Ben Gardon
2020-01-27  9:42   ` Thomas Huth
2020-01-24  9:03 ` [PATCH v4 00/10] Create a userfaultfd demand paging test Paolo Bonzini

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