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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>
Subject: Re: [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to aarch64 and s390x
Date: Mon, 27 Jan 2020 09:38:38 +0100
Message-ID: <20200127083838.u32bylca2n4om6zx@kamzik.brq.redhat.com> (raw)
In-Reply-To: <6061cd22-59bb-c191-bd98-f14d7cd274ae@redhat.com>

On Sat, Jan 25, 2020 at 10:34:16AM +0100, Paolo Bonzini wrote:
> 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.
> > 
> > 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.
> > + */
> > +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);
> > +
> > +	va_start(ap, num);
> > +
> > +	for (i = 0; i < num; i++)
> > +		set_reg(vm, vcpuid, ARM64_CORE_REG(regs.regs[num]),

For AArch64 you also need to squash s/num/i/ for this line.

(Plus I'm still not that pleased with adding this big header to this
file for this function, or the weird line breaks in the assert.)

> > +			va_arg(ap, uint64_t));
> > +
> > +	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;
> > 
> 
> Squashing this:
> 
> diff --git a/tools/testing/selftests/kvm/lib/aarch64/processor.c b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> index a2ff90a75f32..839a76c96f01 100644
> --- a/tools/testing/selftests/kvm/lib/aarch64/processor.c
> +++ b/tools/testing/selftests/kvm/lib/aarch64/processor.c
> @@ -353,6 +353,7 @@ void vm_vcpu_add_default(struct kvm_vm *vm, uint32_t vcpuid, void *guest_code)
>  void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
>  {
>  	va_list ap;
> +	int i;
>  
>  	TEST_ASSERT(num >= 1 && num <= 8, "Unsupported number of args,\n"
>  		    "  num: %u\n",
> diff --git a/tools/testing/selftests/kvm/lib/s390x/processor.c b/tools/testing/selftests/kvm/lib/s390x/processor.c
> index 680f37be9dbc..a0b84235c848 100644
> --- a/tools/testing/selftests/kvm/lib/s390x/processor.c
> +++ b/tools/testing/selftests/kvm/lib/s390x/processor.c
> @@ -289,6 +289,7 @@ void vcpu_args_set(struct kvm_vm *vm, uint32_t vcpuid, unsigned int num, ...)
>  {
>  	va_list ap;
>  	struct kvm_regs regs;
> +	int i;
>  
>  	TEST_ASSERT(num >= 1 && num <= 5, "Unsupported number of args,\n"
>  		    "  num: %u\n",
> 
> Paolo
> 


  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
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 [this message]
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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