From: Bibo Mao <maobibo@loongson.cn>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>
Cc: Tianrui Zhao <zhaotianrui@loongson.cn>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org
Subject: [PATCH v7 3/4] KVM: selftests: Add ucall test support for LoongArch
Date: Fri, 2 Feb 2024 12:10:45 +0800 [thread overview]
Message-ID: <20240202041046.3405779-4-maobibo@loongson.cn> (raw)
In-Reply-To: <20240202041046.3405779-1-maobibo@loongson.cn>
From: Tianrui Zhao <zhaotianrui@loongson.cn>
Add ucall test support for LoongArch, ucall method on LoongArch uses
undefined mmio area. It will cause causes vcpu exits to hypervisor so
that hypervisor can communicate with vcpu.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
.../selftests/kvm/include/loongarch/ucall.h | 20 ++++++++++
.../selftests/kvm/lib/loongarch/ucall.c | 38 +++++++++++++++++++
2 files changed, 58 insertions(+)
create mode 100644 tools/testing/selftests/kvm/include/loongarch/ucall.h
create mode 100644 tools/testing/selftests/kvm/lib/loongarch/ucall.c
diff --git a/tools/testing/selftests/kvm/include/loongarch/ucall.h b/tools/testing/selftests/kvm/include/loongarch/ucall.h
new file mode 100644
index 000000000000..4b68f37efd36
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/loongarch/ucall.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef SELFTEST_KVM_UCALL_H
+#define SELFTEST_KVM_UCALL_H
+
+#include "kvm_util_base.h"
+
+#define UCALL_EXIT_REASON KVM_EXIT_MMIO
+
+/*
+ * ucall_exit_mmio_addr holds per-VM values (global data is duplicated by each
+ * VM), it must not be accessed from host code.
+ */
+extern vm_vaddr_t *ucall_exit_mmio_addr;
+
+static inline void ucall_arch_do_ucall(vm_vaddr_t uc)
+{
+ WRITE_ONCE(*ucall_exit_mmio_addr, uc);
+}
+
+#endif
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..fc6cbb50573f
--- /dev/null
+++ b/tools/testing/selftests/kvm/lib/loongarch/ucall.c
@@ -0,0 +1,38 @@
+// 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.
+ */
+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_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;
+}
--
2.39.3
next prev parent reply other threads:[~2024-02-02 4:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-02 4:10 [PATCH v7 0/4] KVM: selftests: Add LoongArch support Bibo Mao
2024-02-02 4:10 ` [PATCH v7 1/4] KVM: selftests: Add KVM selftests header files for LoongArch Bibo Mao
2024-02-02 4:10 ` [PATCH v7 2/4] KVM: selftests: Add core KVM selftests support " Bibo Mao
2024-02-02 4:10 ` Bibo Mao [this message]
2024-02-02 4:10 ` [PATCH v7 4/4] KVM: selftests: Add test cases " Bibo Mao
2024-02-28 8:51 ` [PATCH v7 0/4] KVM: selftests: Add LoongArch support maobibo
2024-03-14 3:03 ` maobibo
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