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Message-Id: <20210608233816.423958-4-zhenzhong.duan@intel.com>
Date: Wed, 9 Jun 2021 07:38:16 +0800
From: Zhenzhong Duan <zhenzhong.duan@...el.com>
To: linux-kernel@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org, kvm@...r.kernel.org,
maciej.szmigiero@...cle.com, drjones@...hat.com,
pbonzini@...hat.com, shuah@...nel.org,
Zhenzhong Duan <zhenzhong.duan@...el.com>
Subject: [PATCH 3/3] selftests: kvm: Add support for customized slot0 memory size
Current implementatiion only create VM with slot0 memory size
of fixed 512 pages plus page tables and per-cpu memory.
Add a new parameter slot0_mem_pages to vm_create_with_vcpus() and
some comments to clarify the meaning of slot0_mem_pages and
extra_mem_pages.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...el.com>
---
.../testing/selftests/kvm/include/kvm_util.h | 7 +--
.../selftests/kvm/kvm_page_table_test.c | 2 +-
tools/testing/selftests/kvm/lib/kvm_util.c | 47 +++++++++++++++----
.../selftests/kvm/lib/perf_test_util.c | 2 +-
4 files changed, 44 insertions(+), 14 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index fcd8e3855111..8bcadfa8cea5 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -285,10 +285,11 @@ struct kvm_vm *vm_create_default_with_vcpus(uint32_t nr_vcpus, uint64_t extra_me
uint32_t num_percpu_pages, void *guest_code,
uint32_t vcpuids[]);
-/* Like vm_create_default_with_vcpus, but accepts mode as a parameter */
+/* Like vm_create_default_with_vcpus, but accepts mode and slot0 memory as a parameter */
struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
- uint64_t extra_mem_pages, uint32_t num_percpu_pages,
- void *guest_code, uint32_t vcpuids[]);
+ uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
+ uint32_t num_percpu_pages, void *guest_code,
+ uint32_t vcpuids[]);
/*
* Adds a vCPU with reasonable defaults (e.g. a stack)
diff --git a/tools/testing/selftests/kvm/kvm_page_table_test.c b/tools/testing/selftests/kvm/kvm_page_table_test.c
index 1c4753fff19e..82171f17c1d7 100644
--- a/tools/testing/selftests/kvm/kvm_page_table_test.c
+++ b/tools/testing/selftests/kvm/kvm_page_table_test.c
@@ -268,7 +268,7 @@ static struct kvm_vm *pre_init_before_test(enum vm_guest_mode mode, void *arg)
/* Create a VM with enough guest pages */
guest_num_pages = test_mem_size / guest_page_size;
- vm = vm_create_with_vcpus(mode, nr_vcpus,
+ vm = vm_create_with_vcpus(mode, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
guest_num_pages, 0, guest_code, NULL);
/* Align down GPA of the testing memslot */
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 63418df921f0..d86422a119fd 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -308,21 +308,50 @@ struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm)
return vm;
}
+/*
+ * VM Create with customized parameters
+ *
+ * Input Args:
+ * mode - VM Mode (e.g. VM_MODE_P52V48_4K)
+ * nr_vcpus - VCPU count
+ * slot0_mem_pages - Slot0 physical memory size
+ * extra_mem_pages - Non-slot0 physical memory total size
+ * num_percpu_pages - Per-cpu physical memory pages
+ * guest_code - Guest entry point
+ * vcpuids - VCPU IDs
+ *
+ * Output Args: None
+ *
+ * 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),
+ * with customized slot0 memory size, at least 512 pages currently.
+ * extra_mem_pages is only used to calculate the maximum page table size,
+ * no real memory allocation for non-slot0 memory in this function.
+ */
struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
- uint64_t extra_mem_pages, uint32_t num_percpu_pages,
- void *guest_code, uint32_t vcpuids[])
+ uint64_t slot0_mem_pages, uint64_t extra_mem_pages,
+ uint32_t num_percpu_pages, void *guest_code,
+ uint32_t vcpuids[])
{
+ uint64_t vcpu_pages, extra_pg_pages, pages;
+ struct kvm_vm *vm;
+ int i;
+
+ /* Force slot0 memory size not small than DEFAULT_GUEST_PHY_PAGES */
+ if (slot0_mem_pages < DEFAULT_GUEST_PHY_PAGES)
+ slot0_mem_pages = DEFAULT_GUEST_PHY_PAGES;
+
/* The maximum page table size for a memory region will be when the
* smallest pages are used. Considering each page contains x page
* table descriptors, the total extra size for page tables (for extra
* N pages) will be: N/x+N/x^2+N/x^3+... which is definitely smaller
* than N/x*2.
*/
- uint64_t vcpu_pages = (DEFAULT_STACK_PGS + num_percpu_pages) * nr_vcpus;
- uint64_t extra_pg_pages = (extra_mem_pages + vcpu_pages) / PTES_PER_MIN_PAGE * 2;
- uint64_t pages = DEFAULT_GUEST_PHY_PAGES + vcpu_pages + extra_pg_pages;
- struct kvm_vm *vm;
- int i;
+ vcpu_pages = (DEFAULT_STACK_PGS + num_percpu_pages) * nr_vcpus;
+ extra_pg_pages = (slot0_mem_pages + extra_mem_pages + vcpu_pages) / PTES_PER_MIN_PAGE * 2;
+ pages = slot0_mem_pages + vcpu_pages + extra_pg_pages;
TEST_ASSERT(nr_vcpus <= kvm_check_cap(KVM_CAP_MAX_VCPUS),
"nr_vcpus = %d too large for host, max-vcpus = %d",
@@ -354,8 +383,8 @@ struct kvm_vm *vm_create_default_with_vcpus(uint32_t nr_vcpus, uint64_t extra_me
uint32_t num_percpu_pages, void *guest_code,
uint32_t vcpuids[])
{
- return vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus, extra_mem_pages,
- num_percpu_pages, guest_code, vcpuids);
+ return vm_create_with_vcpus(VM_MODE_DEFAULT, nr_vcpus, DEFAULT_GUEST_PHY_PAGES,
+ extra_mem_pages, num_percpu_pages, guest_code, vcpuids);
}
struct kvm_vm *vm_create_default(uint32_t vcpuid, uint64_t extra_mem_pages,
diff --git a/tools/testing/selftests/kvm/lib/perf_test_util.c b/tools/testing/selftests/kvm/lib/perf_test_util.c
index abf381800a59..7397ca299835 100644
--- a/tools/testing/selftests/kvm/lib/perf_test_util.c
+++ b/tools/testing/selftests/kvm/lib/perf_test_util.c
@@ -69,7 +69,7 @@ struct kvm_vm *perf_test_create_vm(enum vm_guest_mode mode, int vcpus,
TEST_ASSERT(vcpu_memory_bytes % perf_test_args.guest_page_size == 0,
"Guest memory size is not guest page size aligned.");
- vm = vm_create_with_vcpus(mode, vcpus,
+ vm = vm_create_with_vcpus(mode, vcpus, DEFAULT_GUEST_PHY_PAGES,
(vcpus * vcpu_memory_bytes) / perf_test_args.guest_page_size,
0, guest_code, NULL);
--
2.25.1
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