diff mbox series

[v1,3/4] selftests: kvm: Add ucall tests for LoongArch KVM

Message ID 20230801020206.1957986-4-zhaotianrui@loongson.cn
State New
Headers
Series selftests: kvm: Add LoongArch support |

Commit Message

zhaotianrui Aug. 1, 2023, 2:02 a.m. UTC 
  Add ucall tests for LoongArch KVM, it means that VM use hypercall
to return to userspace and handle the mmio exception.

Based-on: <20230720062813.4126751-1-zhaotianrui@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 .../selftests/kvm/lib/loongarch/ucall.c       | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/lib/loongarch/ucall.c

Comments

Sean Christopherson Aug. 2, 2023, 6:08 p.m. UTC | #1 
On Tue, Aug 01, 2023, Tianrui Zhao wrote:
> Add ucall tests for LoongArch KVM, it means that VM use hypercall

s/tests/support

> to return to userspace and handle the mmio exception.
> 
> Based-on: <20230720062813.4126751-1-zhaotianrui@loongson.cn>
> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
> ---
>  .../selftests/kvm/lib/loongarch/ucall.c       | 44 +++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 tools/testing/selftests/kvm/lib/loongarch/ucall.c
> 
> diff --git a/tools/testing/selftests/kvm/lib/loongarch/ucall.c b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
> new file mode 100644
> index 000000000000..b32f7c7f6548
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
> @@ -0,0 +1,44 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * ucall support. A ucall is a "hypercall to userspace".
> + *
> + */
> +#include "kvm_util.h"
> +
> +/*
> + * ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
> + * VM), it must not be accessed from host code.
> + */
> +static vm_vaddr_t *ucall_exit_mmio_addr;
> +
> +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
> +{
> +	vm_vaddr_t mmio_gva = vm_vaddr_unused_gap(vm, vm->page_size, KVM_UTIL_MIN_VADDR);
> +
> +	virt_map(vm, mmio_gva, mmio_gpa, 1);
> +
> +	vm->ucall_mmio_addr = mmio_gpa;
> +
> +	write_guest_global(vm, ucall_exit_mmio_addr, (vm_vaddr_t *)mmio_gva);
> +}
> +
> +void ucall_arch_do_ucall(vm_vaddr_t uc)
> +{
> +

Extra newline.

> +	WRITE_ONCE(*ucall_exit_mmio_addr, uc);
> +}
> +
> +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
> +{
> +	struct kvm_run *run = vcpu->run;
> +
> +	if (run->exit_reason == KVM_EXIT_MMIO &&
> +	    run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) {
> +		TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(uint64_t),
> +			    "Unexpected ucall exit mmio address access");
> +
> +		return (void *)(*((uint64_t *)run->mmio.data));
> +	}
> +
> +	return NULL;
> +}
> -- 
> 2.39.1
>
zhaotianrui Aug. 3, 2023, 6:42 a.m. UTC | #2 
在 2023/8/3 上午2:08, Sean Christopherson 写道:
> On Tue, Aug 01, 2023, Tianrui Zhao wrote:
>> Add ucall tests for LoongArch KVM, it means that VM use hypercall
> s/tests/support
Thanks, I will fix this comment.
>
>> to return to userspace and handle the mmio exception.
>>
>> Based-on: <20230720062813.4126751-1-zhaotianrui@loongson.cn>
>> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
>> ---
>>   .../selftests/kvm/lib/loongarch/ucall.c       | 44 +++++++++++++++++++
>>   1 file changed, 44 insertions(+)
>>   create mode 100644 tools/testing/selftests/kvm/lib/loongarch/ucall.c
>>
>> diff --git a/tools/testing/selftests/kvm/lib/loongarch/ucall.c b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
>> new file mode 100644
>> index 000000000000..b32f7c7f6548
>> --- /dev/null
>> +++ b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
>> @@ -0,0 +1,44 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * ucall support. A ucall is a "hypercall to userspace".
>> + *
>> + */
>> +#include "kvm_util.h"
>> +
>> +/*
>> + * ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
>> + * VM), it must not be accessed from host code.
>> + */
>> +static vm_vaddr_t *ucall_exit_mmio_addr;
>> +
>> +void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
>> +{
>> +	vm_vaddr_t mmio_gva = vm_vaddr_unused_gap(vm, vm->page_size, KVM_UTIL_MIN_VADDR);
>> +
>> +	virt_map(vm, mmio_gva, mmio_gpa, 1);
>> +
>> +	vm->ucall_mmio_addr = mmio_gpa;
>> +
>> +	write_guest_global(vm, ucall_exit_mmio_addr, (vm_vaddr_t *)mmio_gva);
>> +}
>> +
>> +void ucall_arch_do_ucall(vm_vaddr_t uc)
>> +{
>> +
> Extra newline.
Thanks, I will remove this line.

Thanks
Tianrui Zhao
>
>> +	WRITE_ONCE(*ucall_exit_mmio_addr, uc);
>> +}
>> +
>> +void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
>> +{
>> +	struct kvm_run *run = vcpu->run;
>> +
>> +	if (run->exit_reason == KVM_EXIT_MMIO &&
>> +	    run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) {
>> +		TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(uint64_t),
>> +			    "Unexpected ucall exit mmio address access");
>> +
>> +		return (void *)(*((uint64_t *)run->mmio.data));
>> +	}
>> +
>> +	return NULL;
>> +}
>> -- 
>> 2.39.1
>>
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/lib/loongarch/ucall.c b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
new file mode 100644
index 000000000000..b32f7c7f6548
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
@@ -0,0 +1,44 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ucall support. A ucall is a "hypercall to userspace".
+ *
+ */
+#include "kvm_util.h"
+
+/*
+ * ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
+ * VM), it must not be accessed from host code.
+ */
+static vm_vaddr_t *ucall_exit_mmio_addr;
+
+void ucall_arch_init(struct kvm_vm *vm, vm_paddr_t mmio_gpa)
+{
+	vm_vaddr_t mmio_gva = vm_vaddr_unused_gap(vm, vm->page_size, KVM_UTIL_MIN_VADDR);
+
+	virt_map(vm, mmio_gva, mmio_gpa, 1);
+
+	vm->ucall_mmio_addr = mmio_gpa;
+
+	write_guest_global(vm, ucall_exit_mmio_addr, (vm_vaddr_t *)mmio_gva);
+}
+
+void ucall_arch_do_ucall(vm_vaddr_t uc)
+{
+
+	WRITE_ONCE(*ucall_exit_mmio_addr, uc);
+}
+
+void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu)
+{
+	struct kvm_run *run = vcpu->run;
+
+	if (run->exit_reason == KVM_EXIT_MMIO &&
+	    run->mmio.phys_addr == vcpu->vm->ucall_mmio_addr) {
+		TEST_ASSERT(run->mmio.is_write && run->mmio.len == sizeof(uint64_t),
+			    "Unexpected ucall exit mmio address access");
+
+		return (void *)(*((uint64_t *)run->mmio.data));
+	}
+
+	return NULL;
+}