* [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes
@ 2022-10-18 4:04 Gavin Shan
2022-10-18 4:04 ` [PATCH v2 1/6] KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm() Gavin Shan
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw)
To: kvmarm
Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah,
oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol,
zhenyzha, shan.gavin
kvm/selftests/memslots_perf_test doesn't work with 64KB-page-size-host
and 4KB-page-size-guest on aarch64. In the implementation, the host and
guest page size have been hardcoded to 4KB. It's ovbiously not working
on aarch64 which supports 4KB, 16KB, 64KB individually on host and guest.
This series tries to fix it. After the series is applied, the test runs
successfully with 64KB-page-size-host and 4KB-page-size-guest.
# ./memslots_perf_tests -v -s 512
Since we're here, the code is cleaned up a bit as PATCH[1-3] do. The
other patches are fixes to handle the mismatched host/guest page
sized.
v1: https://lore.kernel.org/kvmarm/20221014071914.227134-1-gshan@redhat.com/T/#t
Changelog
=========
v2:
* Pick the smaller value between the ones specified by
user or probed from KVM_CAP_NR_MEMSLOTS in PATCH[v2 3/6] (Maciej)
* Improved comments about MEM_TEST_MOVE_SIZE in
PATCH[v2 4/6] (Maciej)
* Avoid mismatched guest page size after VM is started in
prepare_vm() in PATCH[v2 4/6] (Maciej)
* Fix condition to check MEM_TEST_{UNMAP, UNMAP_CHUNK}_SIZE
in check_memory_size() in PATCH[v2 4/6] (Maciej)
* Define base and huge page size in kvm_util_base.h in
PATCH[v2 5/6] (Sean)
* Add checks on host/guest page size in check_memory_size()
and fail early if any of them exceeds 64KB in PATCH[v2 5/6] (Maciej)
Gavin Shan (6):
KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm()
KVM: selftests: memslot_perf_test: Consolidate loop conditions in
prepare_vm()
KVM: selftests: memslot_perf_test: Probe memory slots for once
KVM: selftests: memslot_perf_test: Support variable guest page size
KVM: selftests: memslot_perf_test: Consolidate memory sizes
KVM: selftests: memslot_perf_test: Report optimal memory slots
.../selftests/kvm/include/kvm_util_base.h | 15 +
.../testing/selftests/kvm/memslot_perf_test.c | 307 +++++++++++-------
2 files changed, 213 insertions(+), 109 deletions(-)
--
2.23.0
^ permalink raw reply [flat|nested] 7+ messages in thread* [PATCH v2 1/6] KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm() 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 2022-10-18 4:04 ` [PATCH v2 2/6] KVM: selftests: memslot_perf_test: Consolidate loop conditions " Gavin Shan ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin In prepare_vm(), 'data->nslots' is assigned with 'max_mem_slots - 1' at the beginning, meaning they are interchangeable. Use 'data->nslots' isntead of 'max_mem_slots - 1'. With this, it becomes easier to move the logic of probing number of slots into upper layer in subsequent patches. No functional change intended. Signed-off-by: Gavin Shan <gshan@redhat.com> --- tools/testing/selftests/kvm/memslot_perf_test.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index 44995446d942..231cc8449c2e 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -280,14 +280,14 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, ucall_init(data->vm, NULL); pr_info_v("Adding slots 1..%i, each slot with %"PRIu64" pages + %"PRIu64" extra pages last\n", - max_mem_slots - 1, data->pages_per_slot, rempages); + data->nslots, data->pages_per_slot, rempages); clock_gettime(CLOCK_MONOTONIC, &tstart); - for (slot = 1, guest_addr = MEM_GPA; slot < max_mem_slots; slot++) { + for (slot = 1, guest_addr = MEM_GPA; slot <= data->nslots; slot++) { uint64_t npages; npages = data->pages_per_slot; - if (slot == max_mem_slots - 1) + if (slot == data->nslots) npages += rempages; vm_userspace_mem_region_add(data->vm, VM_MEM_SRC_ANONYMOUS, @@ -297,12 +297,12 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, } *slot_runtime = timespec_elapsed(tstart); - for (slot = 0, guest_addr = MEM_GPA; slot < max_mem_slots - 1; slot++) { + for (slot = 0, guest_addr = MEM_GPA; slot < data->nslots; slot++) { uint64_t npages; uint64_t gpa; npages = data->pages_per_slot; - if (slot == max_mem_slots - 2) + if (slot == data->nslots - 1) npages += rempages; gpa = vm_phy_pages_alloc(data->vm, npages, guest_addr, -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 2/6] KVM: selftests: memslot_perf_test: Consolidate loop conditions in prepare_vm() 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan 2022-10-18 4:04 ` [PATCH v2 1/6] KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm() Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 2022-10-18 4:04 ` [PATCH v2 3/6] KVM: selftests: memslot_perf_test: Probe memory slots for once Gavin Shan ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin There are two loops in prepare_vm(), which have different conditions. 'slot' is treated as meory slot index in the first loop, but index of the host virtual address array in the second loop. It makes it a bit hard to understand the code. Change the usage of 'slot' in the second loop, to treat it as the memory slot index either. No functional change intended. Signed-off-by: Gavin Shan <gshan@redhat.com> --- tools/testing/selftests/kvm/memslot_perf_test.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index 231cc8449c2e..dcb492b3f27b 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -297,21 +297,20 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, } *slot_runtime = timespec_elapsed(tstart); - for (slot = 0, guest_addr = MEM_GPA; slot < data->nslots; slot++) { + for (slot = 1, guest_addr = MEM_GPA; slot <= data->nslots; slot++) { uint64_t npages; uint64_t gpa; npages = data->pages_per_slot; - if (slot == data->nslots - 1) + if (slot == data->nslots) npages += rempages; - gpa = vm_phy_pages_alloc(data->vm, npages, guest_addr, - slot + 1); + gpa = vm_phy_pages_alloc(data->vm, npages, guest_addr, slot); TEST_ASSERT(gpa == guest_addr, "vm_phy_pages_alloc() failed\n"); - data->hva_slots[slot] = addr_gpa2hva(data->vm, guest_addr); - memset(data->hva_slots[slot], 0, npages * 4096); + data->hva_slots[slot - 1] = addr_gpa2hva(data->vm, guest_addr); + memset(data->hva_slots[slot - 1], 0, npages * 4096); guest_addr += npages * 4096; } -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 3/6] KVM: selftests: memslot_perf_test: Probe memory slots for once 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan 2022-10-18 4:04 ` [PATCH v2 1/6] KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm() Gavin Shan 2022-10-18 4:04 ` [PATCH v2 2/6] KVM: selftests: memslot_perf_test: Consolidate loop conditions " Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 2022-10-18 4:04 ` [PATCH v2 4/6] KVM: selftests: memslot_perf_test: Support variable guest page size Gavin Shan ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin prepare_vm() is called in every iteration and run. The allowed memory slots (KVM_CAP_NR_MEMSLOTS) are probed for multiple times. It's not free and unnecessary. Move the probing logic for the allowed memory slots to parse_args() for once, which is upper layer of prepare_vm(). No functional change intended. Signed-off-by: Gavin Shan <gshan@redhat.com> --- .../testing/selftests/kvm/memslot_perf_test.c | 32 +++++++++++-------- 1 file changed, 19 insertions(+), 13 deletions(-) diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index dcb492b3f27b..f0ea3f75b6e1 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -245,27 +245,17 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, void *guest_code, uint64_t mempages, struct timespec *slot_runtime) { - uint32_t max_mem_slots; uint64_t rempages; uint64_t guest_addr; uint32_t slot; struct timespec tstart; struct sync_area *sync; - max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS); - TEST_ASSERT(max_mem_slots > 1, - "KVM_CAP_NR_MEMSLOTS should be greater than 1"); - TEST_ASSERT(nslots > 1 || nslots == -1, - "Slot count cap should be greater than 1"); - if (nslots != -1) - max_mem_slots = min(max_mem_slots, (uint32_t)nslots); - pr_info_v("Allowed number of memory slots: %"PRIu32"\n", max_mem_slots); - TEST_ASSERT(mempages > 1, "Can't test without any memory"); data->npages = mempages; - data->nslots = max_mem_slots - 1; + data->nslots = nslots; data->pages_per_slot = mempages / data->nslots; if (!data->pages_per_slot) { *maxslots = mempages + 1; @@ -869,6 +859,7 @@ static void help(char *name, struct test_args *targs) static bool parse_args(int argc, char *argv[], struct test_args *targs) { + uint32_t max_mem_slots; int opt; while ((opt = getopt(argc, argv, "hvds:f:e:l:r:")) != -1) { @@ -885,8 +876,8 @@ static bool parse_args(int argc, char *argv[], break; case 's': targs->nslots = atoi(optarg); - if (targs->nslots <= 0 && targs->nslots != -1) { - pr_info("Slot count cap has to be positive or -1 for no cap\n"); + if (targs->nslots <= 1 && targs->nslots != -1) { + pr_info("Slot count cap must be larger than 1 or -1 for no cap\n"); return false; } break; @@ -932,6 +923,21 @@ static bool parse_args(int argc, char *argv[], return false; } + max_mem_slots = kvm_check_cap(KVM_CAP_NR_MEMSLOTS); + if (max_mem_slots <= 1) { + pr_info("KVM_CAP_NR_MEMSLOTS should be greater than 1\n"); + return false; + } + + /* Memory slot 0 is reserved */ + if (targs->nslots == -1) + targs->nslots = max_mem_slots - 1; + else + targs->nslots = min_t(int, targs->nslots, max_mem_slots) - 1; + + pr_info_v("Allowed Number of memory slots: %"PRIu32"\n", + targs->nslots + 1); + return true; } -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 4/6] KVM: selftests: memslot_perf_test: Support variable guest page size 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan ` (2 preceding siblings ...) 2022-10-18 4:04 ` [PATCH v2 3/6] KVM: selftests: memslot_perf_test: Probe memory slots for once Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 2022-10-18 4:04 ` [PATCH v2 5/6] KVM: selftests: memslot_perf_test: Consolidate memory sizes Gavin Shan 2022-10-18 4:04 ` [PATCH v2 6/6] KVM: selftests: memslot_perf_test: Report optimal memory slots Gavin Shan 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin The test case is obviously broken on aarch64 because non-4KB guest page size is supported. The guest page size on aarch64 could be 4KB, 16KB or 64KB. This supports variable guest page size, mostly for aarch64. - The host determines the guest page size when virtual machine is created. The value is also passed to guest through the synchronization area. - The number of guest pages are unknown until the virtual machine is to be created. So all the related macros are dropped. Instead, their values are dynamically calculated based on the guest page size. - The static checks on memory sizes and pages becomes dependent on guest page size, which is unknown until the virtual machine is about to be created. So all the static checks are converted to dynamic checks, done in check_memory_sizes(). - As the address passed to madvise() should be aligned to host page, the size of page chunk is automatically selected, other than one page. - All other changes included in this patch are almost mechanical replacing '4096' with 'guest_page_size'. Signed-off-by: Gavin Shan <gshan@redhat.com> --- .../testing/selftests/kvm/memslot_perf_test.c | 201 +++++++++++------- 1 file changed, 120 insertions(+), 81 deletions(-) diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index f0ea3f75b6e1..78a481501ec4 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -26,14 +26,11 @@ #include <processor.h> #define MEM_SIZE ((512U << 20) + 4096) -#define MEM_SIZE_PAGES (MEM_SIZE / 4096) #define MEM_GPA 0x10000000UL #define MEM_AUX_GPA MEM_GPA #define MEM_SYNC_GPA MEM_AUX_GPA #define MEM_TEST_GPA (MEM_AUX_GPA + 4096) #define MEM_TEST_SIZE (MEM_SIZE - 4096) -static_assert(MEM_SIZE % 4096 == 0, "invalid mem size"); -static_assert(MEM_TEST_SIZE % 4096 == 0, "invalid mem test size"); /* * 32 MiB is max size that gets well over 100 iterations on 509 slots. @@ -42,43 +39,28 @@ static_assert(MEM_TEST_SIZE % 4096 == 0, "invalid mem test size"); * limited resolution). */ #define MEM_SIZE_MAP ((32U << 20) + 4096) -#define MEM_SIZE_MAP_PAGES (MEM_SIZE_MAP / 4096) #define MEM_TEST_MAP_SIZE (MEM_SIZE_MAP - 4096) -#define MEM_TEST_MAP_SIZE_PAGES (MEM_TEST_MAP_SIZE / 4096) -static_assert(MEM_SIZE_MAP % 4096 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE % 4096 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE_PAGES % 2 == 0, "invalid map test region size"); -static_assert(MEM_TEST_MAP_SIZE_PAGES > 2, "invalid map test region size"); /* * 128 MiB is min size that fills 32k slots with at least one page in each * while at the same time gets 100+ iterations in such test + * + * 2 MiB chunk size like a typical huge page */ #define MEM_TEST_UNMAP_SIZE (128U << 20) -#define MEM_TEST_UNMAP_SIZE_PAGES (MEM_TEST_UNMAP_SIZE / 4096) -/* 2 MiB chunk size like a typical huge page */ -#define MEM_TEST_UNMAP_CHUNK_PAGES (2U << (20 - 12)) -static_assert(MEM_TEST_UNMAP_SIZE <= MEM_TEST_SIZE, - "invalid unmap test region size"); -static_assert(MEM_TEST_UNMAP_SIZE % 4096 == 0, - "invalid unmap test region size"); -static_assert(MEM_TEST_UNMAP_SIZE_PAGES % - (2 * MEM_TEST_UNMAP_CHUNK_PAGES) == 0, - "invalid unmap test region size"); +#define MEM_TEST_UNMAP_CHUNK_SIZE (2U << 20) /* * For the move active test the middle of the test area is placed on * a memslot boundary: half lies in the memslot being moved, half in * other memslot(s). * - * When running this test with 32k memslots (32764, really) each memslot - * contains 4 pages. - * The last one additionally contains the remaining 21 pages of memory, - * for the total size of 25 pages. - * Hence, the maximum size here is 50 pages. + * When running this test with 32k memslots, actually 32763 excluding + * the reserved memory slot 0, the memory for each slot is 16KB. The + * last slot contains 100KB memory with the remaining 84KB. Hence, + * the maximum size is double of that (200KB) */ -#define MEM_TEST_MOVE_SIZE_PAGES (50) -#define MEM_TEST_MOVE_SIZE (MEM_TEST_MOVE_SIZE_PAGES * 4096) +#define MEM_TEST_MOVE_SIZE 0x32000 #define MEM_TEST_MOVE_GPA_DEST (MEM_GPA + MEM_SIZE) static_assert(MEM_TEST_MOVE_SIZE <= MEM_TEST_SIZE, "invalid move test region size"); @@ -100,6 +82,7 @@ struct vm_data { }; struct sync_area { + uint32_t guest_page_size; atomic_bool start_flag; atomic_bool exit_flag; atomic_bool sync_flag; @@ -192,14 +175,15 @@ static void *vm_gpa2hva(struct vm_data *data, uint64_t gpa, uint64_t *rempages) uint64_t gpage, pgoffs; uint32_t slot, slotoffs; void *base; + uint32_t guest_page_size = data->vm->page_size; TEST_ASSERT(gpa >= MEM_GPA, "Too low gpa to translate"); - TEST_ASSERT(gpa < MEM_GPA + data->npages * 4096, + TEST_ASSERT(gpa < MEM_GPA + data->npages * guest_page_size, "Too high gpa to translate"); gpa -= MEM_GPA; - gpage = gpa / 4096; - pgoffs = gpa % 4096; + gpage = gpa / guest_page_size; + pgoffs = gpa % guest_page_size; slot = min(gpage / data->pages_per_slot, (uint64_t)data->nslots - 1); slotoffs = gpage - (slot * data->pages_per_slot); @@ -217,14 +201,16 @@ static void *vm_gpa2hva(struct vm_data *data, uint64_t gpa, uint64_t *rempages) } base = data->hva_slots[slot]; - return (uint8_t *)base + slotoffs * 4096 + pgoffs; + return (uint8_t *)base + slotoffs * guest_page_size + pgoffs; } static uint64_t vm_slot2gpa(struct vm_data *data, uint32_t slot) { + uint32_t guest_page_size = data->vm->page_size; + TEST_ASSERT(slot < data->nslots, "Too high slot number"); - return MEM_GPA + slot * data->pages_per_slot * 4096; + return MEM_GPA + slot * data->pages_per_slot * guest_page_size; } static struct vm_data *alloc_vm(void) @@ -242,33 +228,35 @@ static struct vm_data *alloc_vm(void) } static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, - void *guest_code, uint64_t mempages, + void *guest_code, uint64_t mem_size, struct timespec *slot_runtime) { - uint64_t rempages; + uint64_t mempages, rempages; uint64_t guest_addr; - uint32_t slot; + uint32_t slot, guest_page_size; struct timespec tstart; struct sync_area *sync; - TEST_ASSERT(mempages > 1, - "Can't test without any memory"); + guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; + mempages = mem_size / guest_page_size; + + data->vm = __vm_create_with_one_vcpu(&data->vcpu, mempages, guest_code); + ucall_init(data->vm, NULL); + TEST_ASSERT(data->vm->page_size == guest_page_size, "Invalid VM page size"); data->npages = mempages; + TEST_ASSERT(data->npages > 1, "Can't test without any memory"); data->nslots = nslots; - data->pages_per_slot = mempages / data->nslots; + data->pages_per_slot = data->npages / data->nslots; if (!data->pages_per_slot) { - *maxslots = mempages + 1; + *maxslots = data->npages + 1; return false; } - rempages = mempages % data->nslots; + rempages = data->npages % data->nslots; data->hva_slots = malloc(sizeof(*data->hva_slots) * data->nslots); TEST_ASSERT(data->hva_slots, "malloc() fail"); - data->vm = __vm_create_with_one_vcpu(&data->vcpu, mempages, guest_code); - ucall_init(data->vm, NULL); - pr_info_v("Adding slots 1..%i, each slot with %"PRIu64" pages + %"PRIu64" extra pages last\n", data->nslots, data->pages_per_slot, rempages); @@ -283,7 +271,7 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, vm_userspace_mem_region_add(data->vm, VM_MEM_SRC_ANONYMOUS, guest_addr, slot, npages, 0); - guest_addr += npages * 4096; + guest_addr += npages * guest_page_size; } *slot_runtime = timespec_elapsed(tstart); @@ -300,12 +288,12 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, "vm_phy_pages_alloc() failed\n"); data->hva_slots[slot - 1] = addr_gpa2hva(data->vm, guest_addr); - memset(data->hva_slots[slot - 1], 0, npages * 4096); + memset(data->hva_slots[slot - 1], 0, npages * guest_page_size); - guest_addr += npages * 4096; + guest_addr += npages * guest_page_size; } - virt_map(data->vm, MEM_GPA, MEM_GPA, mempages); + virt_map(data->vm, MEM_GPA, MEM_GPA, data->npages); sync = (typeof(sync))vm_gpa2hva(data, MEM_SYNC_GPA, NULL); atomic_init(&sync->start_flag, false); @@ -404,6 +392,7 @@ static bool guest_perform_sync(void) static void guest_code_test_memslot_move(void) { struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); uintptr_t base = (typeof(base))READ_ONCE(sync->move_area_ptr); GUEST_SYNC(0); @@ -414,7 +403,7 @@ static void guest_code_test_memslot_move(void) uintptr_t ptr; for (ptr = base; ptr < base + MEM_TEST_MOVE_SIZE; - ptr += 4096) + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; /* @@ -432,6 +421,7 @@ static void guest_code_test_memslot_move(void) static void guest_code_test_memslot_map(void) { struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); GUEST_SYNC(0); @@ -441,14 +431,16 @@ static void guest_code_test_memslot_map(void) uintptr_t ptr; for (ptr = MEM_TEST_GPA; - ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; if (!guest_perform_sync()) break; for (ptr = MEM_TEST_GPA + MEM_TEST_MAP_SIZE / 2; - ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_MAP_SIZE; + ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_2; if (!guest_perform_sync()) @@ -495,6 +487,9 @@ static void guest_code_test_memslot_unmap(void) static void guest_code_test_memslot_rw(void) { + struct sync_area *sync = (typeof(sync))MEM_SYNC_GPA; + uint32_t page_size = (typeof(page_size))READ_ONCE(sync->guest_page_size); + GUEST_SYNC(0); guest_spin_until_start(); @@ -503,14 +498,14 @@ static void guest_code_test_memslot_rw(void) uintptr_t ptr; for (ptr = MEM_TEST_GPA; - ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += 4096) + ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += page_size) *(uint64_t *)ptr = MEM_TEST_VAL_1; if (!guest_perform_sync()) break; - for (ptr = MEM_TEST_GPA + 4096 / 2; - ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += 4096) { + for (ptr = MEM_TEST_GPA + page_size / 2; + ptr < MEM_TEST_GPA + MEM_TEST_SIZE; ptr += page_size) { uint64_t val = *(uint64_t *)ptr; GUEST_ASSERT_1(val == MEM_TEST_VAL_2, val); @@ -528,6 +523,8 @@ static bool test_memslot_move_prepare(struct vm_data *data, struct sync_area *sync, uint64_t *maxslots, bool isactive) { + uint32_t guest_page_size = data->vm->page_size; + uint64_t move_pages = MEM_TEST_MOVE_SIZE / guest_page_size; uint64_t movesrcgpa, movetestgpa; movesrcgpa = vm_slot2gpa(data, data->nslots - 1); @@ -536,7 +533,7 @@ static bool test_memslot_move_prepare(struct vm_data *data, uint64_t lastpages; vm_gpa2hva(data, movesrcgpa, &lastpages); - if (lastpages < MEM_TEST_MOVE_SIZE_PAGES / 2) { + if (lastpages < move_pages / 2) { *maxslots = 0; return false; } @@ -582,8 +579,9 @@ static void test_memslot_do_unmap(struct vm_data *data, uint64_t offsp, uint64_t count) { uint64_t gpa, ctr; + uint32_t guest_page_size = data->vm->page_size; - for (gpa = MEM_TEST_GPA + offsp * 4096, ctr = 0; ctr < count; ) { + for (gpa = MEM_TEST_GPA + offsp * guest_page_size, ctr = 0; ctr < count; ) { uint64_t npages; void *hva; int ret; @@ -591,12 +589,12 @@ static void test_memslot_do_unmap(struct vm_data *data, hva = vm_gpa2hva(data, gpa, &npages); TEST_ASSERT(npages, "Empty memory slot at gptr 0x%"PRIx64, gpa); npages = min(npages, count - ctr); - ret = madvise(hva, npages * 4096, MADV_DONTNEED); + ret = madvise(hva, npages * guest_page_size, MADV_DONTNEED); TEST_ASSERT(!ret, "madvise(%p, MADV_DONTNEED) on VM memory should not fail for gptr 0x%"PRIx64, hva, gpa); ctr += npages; - gpa += npages * 4096; + gpa += npages * guest_page_size; } TEST_ASSERT(ctr == count, "madvise(MADV_DONTNEED) should exactly cover all of the requested area"); @@ -607,11 +605,12 @@ static void test_memslot_map_unmap_check(struct vm_data *data, { uint64_t gpa; uint64_t *val; + uint32_t guest_page_size = data->vm->page_size; if (!map_unmap_verify) return; - gpa = MEM_TEST_GPA + offsp * 4096; + gpa = MEM_TEST_GPA + offsp * guest_page_size; val = (typeof(val))vm_gpa2hva(data, gpa, NULL); TEST_ASSERT(*val == valexp, "Guest written values should read back correctly before unmap (%"PRIu64" vs %"PRIu64" @ %"PRIx64")", @@ -621,12 +620,14 @@ static void test_memslot_map_unmap_check(struct vm_data *data, static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) { + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_pages = MEM_TEST_MAP_SIZE / guest_page_size; + /* * Unmap the second half of the test area while guest writes to (maps) * the first half. */ - test_memslot_do_unmap(data, MEM_TEST_MAP_SIZE_PAGES / 2, - MEM_TEST_MAP_SIZE_PAGES / 2); + test_memslot_do_unmap(data, guest_pages / 2, guest_pages / 2); /* * Wait for the guest to finish writing the first half of the test @@ -637,10 +638,8 @@ static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) */ host_perform_sync(sync); test_memslot_map_unmap_check(data, 0, MEM_TEST_VAL_1); - test_memslot_map_unmap_check(data, - MEM_TEST_MAP_SIZE_PAGES / 2 - 1, - MEM_TEST_VAL_1); - test_memslot_do_unmap(data, 0, MEM_TEST_MAP_SIZE_PAGES / 2); + test_memslot_map_unmap_check(data, guest_pages / 2 - 1, MEM_TEST_VAL_1); + test_memslot_do_unmap(data, 0, guest_pages / 2); /* @@ -653,16 +652,16 @@ static void test_memslot_map_loop(struct vm_data *data, struct sync_area *sync) * the test area. */ host_perform_sync(sync); - test_memslot_map_unmap_check(data, MEM_TEST_MAP_SIZE_PAGES / 2, - MEM_TEST_VAL_2); - test_memslot_map_unmap_check(data, MEM_TEST_MAP_SIZE_PAGES - 1, - MEM_TEST_VAL_2); + test_memslot_map_unmap_check(data, guest_pages / 2, MEM_TEST_VAL_2); + test_memslot_map_unmap_check(data, guest_pages - 1, MEM_TEST_VAL_2); } static void test_memslot_unmap_loop_common(struct vm_data *data, struct sync_area *sync, uint64_t chunk) { + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_pages = MEM_TEST_UNMAP_SIZE / guest_page_size; uint64_t ctr; /* @@ -674,42 +673,49 @@ static void test_memslot_unmap_loop_common(struct vm_data *data, */ host_perform_sync(sync); test_memslot_map_unmap_check(data, 0, MEM_TEST_VAL_1); - for (ctr = 0; ctr < MEM_TEST_UNMAP_SIZE_PAGES / 2; ctr += chunk) + for (ctr = 0; ctr < guest_pages / 2; ctr += chunk) test_memslot_do_unmap(data, ctr, chunk); /* Likewise, but for the opposite host / guest areas */ host_perform_sync(sync); - test_memslot_map_unmap_check(data, MEM_TEST_UNMAP_SIZE_PAGES / 2, - MEM_TEST_VAL_2); - for (ctr = MEM_TEST_UNMAP_SIZE_PAGES / 2; - ctr < MEM_TEST_UNMAP_SIZE_PAGES; ctr += chunk) + test_memslot_map_unmap_check(data, guest_pages / 2, MEM_TEST_VAL_2); + for (ctr = guest_pages / 2; ctr < guest_pages; ctr += chunk) test_memslot_do_unmap(data, ctr, chunk); } static void test_memslot_unmap_loop(struct vm_data *data, struct sync_area *sync) { - test_memslot_unmap_loop_common(data, sync, 1); + uint32_t host_page_size = getpagesize(); + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_chunk_pages = guest_page_size >= host_page_size ? + 1 : host_page_size / guest_page_size; + + test_memslot_unmap_loop_common(data, sync, guest_chunk_pages); } static void test_memslot_unmap_loop_chunked(struct vm_data *data, struct sync_area *sync) { - test_memslot_unmap_loop_common(data, sync, MEM_TEST_UNMAP_CHUNK_PAGES); + uint32_t guest_page_size = data->vm->page_size; + uint64_t guest_chunk_pages = MEM_TEST_UNMAP_CHUNK_SIZE / guest_page_size; + + test_memslot_unmap_loop_common(data, sync, guest_chunk_pages); } static void test_memslot_rw_loop(struct vm_data *data, struct sync_area *sync) { uint64_t gptr; + uint32_t guest_page_size = data->vm->page_size; - for (gptr = MEM_TEST_GPA + 4096 / 2; - gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += 4096) + for (gptr = MEM_TEST_GPA + guest_page_size / 2; + gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += guest_page_size) *(uint64_t *)vm_gpa2hva(data, gptr, NULL) = MEM_TEST_VAL_2; host_perform_sync(sync); for (gptr = MEM_TEST_GPA; - gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += 4096) { + gptr < MEM_TEST_GPA + MEM_TEST_SIZE; gptr += guest_page_size) { uint64_t *vptr = (typeof(vptr))vm_gpa2hva(data, gptr, NULL); uint64_t val = *vptr; @@ -738,7 +744,7 @@ static bool test_execute(int nslots, uint64_t *maxslots, struct timespec *slot_runtime, struct timespec *guest_runtime) { - uint64_t mem_size = tdata->mem_size ? : MEM_SIZE_PAGES; + uint64_t mem_size = tdata->mem_size ? : MEM_SIZE; struct vm_data *data; struct sync_area *sync; struct timespec tstart; @@ -753,6 +759,7 @@ static bool test_execute(int nslots, uint64_t *maxslots, sync = (typeof(sync))vm_gpa2hva(data, MEM_SYNC_GPA, NULL); + sync->guest_page_size = data->vm->page_size; if (tdata->prepare && !tdata->prepare(data, sync, maxslots)) { ret = false; @@ -786,19 +793,19 @@ static bool test_execute(int nslots, uint64_t *maxslots, static const struct test_data tests[] = { { .name = "map", - .mem_size = MEM_SIZE_MAP_PAGES, + .mem_size = MEM_SIZE_MAP, .guest_code = guest_code_test_memslot_map, .loop = test_memslot_map_loop, }, { .name = "unmap", - .mem_size = MEM_TEST_UNMAP_SIZE_PAGES + 1, + .mem_size = MEM_TEST_UNMAP_SIZE + 4096, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop, }, { .name = "unmap chunked", - .mem_size = MEM_TEST_UNMAP_SIZE_PAGES + 1, + .mem_size = MEM_TEST_UNMAP_SIZE + 4096, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop_chunked, }, @@ -856,6 +863,35 @@ static void help(char *name, struct test_args *targs) pr_info("%d: %s\n", ctr, tests[ctr].name); } +static bool check_memory_sizes(void) +{ + uint32_t guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; + + if (MEM_SIZE % guest_page_size || + MEM_TEST_SIZE % guest_page_size) { + pr_info("invalid MEM_SIZE or MEM_TEST_SIZE\n"); + return false; + } + + if (MEM_SIZE_MAP % guest_page_size || + MEM_TEST_MAP_SIZE % guest_page_size || + (MEM_TEST_MAP_SIZE / guest_page_size) <= 2 || + (MEM_TEST_MAP_SIZE / guest_page_size) % 2) { + pr_info("invalid MEM_SIZE_MAP or MEM_TEST_MAP_SIZE\n"); + return false; + } + + if (MEM_TEST_UNMAP_SIZE > MEM_TEST_SIZE || + MEM_TEST_UNMAP_SIZE % guest_page_size || + (MEM_TEST_UNMAP_SIZE / guest_page_size) % + (2 * MEM_TEST_UNMAP_CHUNK_SIZE / guest_page_size)) { + pr_info("invalid MEM_TEST_UNMAP_SIZE or MEM_TEST_UNMAP_CHUNK_SIZE\n"); + return false; + } + + return true; +} + static bool parse_args(int argc, char *argv[], struct test_args *targs) { @@ -1015,6 +1051,9 @@ int main(int argc, char *argv[]) /* Tell stdout not to buffer its content */ setbuf(stdout, NULL); + if (!check_memory_sizes()) + return -1; + if (!parse_args(argc, argv, &targs)) return -1; -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 5/6] KVM: selftests: memslot_perf_test: Consolidate memory sizes 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan ` (3 preceding siblings ...) 2022-10-18 4:04 ` [PATCH v2 4/6] KVM: selftests: memslot_perf_test: Support variable guest page size Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 2022-10-18 4:04 ` [PATCH v2 6/6] KVM: selftests: memslot_perf_test: Report optimal memory slots Gavin Shan 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin The addresses and sizes passed to vm_userspace_mem_region_add() and madvise() should be aligned to host page size, which can be 64KB on aarch64. So it's wrong by passing additional fixed 4KB memory area to various tests. Fix it by passing additional fixed 64KB memory area to various tests. We also add checks to ensure that none of host/guest page size exceeds 64KB. After it's applied, the following command works fine on 64KB-page-size-host and 4KB-page-size-guest. # ./memslot_perf_test -v -s 512 Signed-off-by: Gavin Shan <gshan@redhat.com> --- .../selftests/kvm/include/kvm_util_base.h | 15 ++++++++++ .../testing/selftests/kvm/memslot_perf_test.c | 30 ++++++++++++------- 2 files changed, 34 insertions(+), 11 deletions(-) diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h index e42a09cd24a0..bd9a19b9054b 100644 --- a/tools/testing/selftests/kvm/include/kvm_util_base.h +++ b/tools/testing/selftests/kvm/include/kvm_util_base.h @@ -26,6 +26,21 @@ #define NSEC_PER_SEC 1000000000L +#define SIZE_KiB (1UL << 10) +#define SIZE_MiB (1UL << 20) +#define SIZE_GiB (1UL << 30) +#define SIZE_TiB (1UL << 40) + +/* Base and huge page size */ +#define SIZE_4KiB (4 * SIZE_KiB) +#define SIZE_16KiB (16 * SIZE_KiB) +#define SIZE_64KiB (64 * SIZE_KiB) +#define SIZE_2MiB (2 * SIZE_MiB) +#define SIZE_32MiB (32 * SIZE_MiB) +#define SIZE_512MiB (512 * SIZE_MiB) +#define SIZE_1GiB (1 * SIZE_GiB) +#define SIZE_16GiB (16 * SIZE_GiB) + typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */ typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */ diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index 78a481501ec4..3ab385e40bc0 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -25,12 +25,14 @@ #include <kvm_util.h> #include <processor.h> -#define MEM_SIZE ((512U << 20) + 4096) -#define MEM_GPA 0x10000000UL +#define MEM_EXTRA_SIZE SIZE_64KiB + +#define MEM_SIZE (SIZE_512MiB + MEM_EXTRA_SIZE) +#define MEM_GPA (256 * SIZE_MiB) #define MEM_AUX_GPA MEM_GPA #define MEM_SYNC_GPA MEM_AUX_GPA -#define MEM_TEST_GPA (MEM_AUX_GPA + 4096) -#define MEM_TEST_SIZE (MEM_SIZE - 4096) +#define MEM_TEST_GPA (MEM_AUX_GPA + MEM_EXTRA_SIZE) +#define MEM_TEST_SIZE (MEM_SIZE - MEM_EXTRA_SIZE) /* * 32 MiB is max size that gets well over 100 iterations on 509 slots. @@ -38,8 +40,8 @@ * 8194 slots in use can then be tested (although with slightly * limited resolution). */ -#define MEM_SIZE_MAP ((32U << 20) + 4096) -#define MEM_TEST_MAP_SIZE (MEM_SIZE_MAP - 4096) +#define MEM_SIZE_MAP (SIZE_32MiB + MEM_EXTRA_SIZE) +#define MEM_TEST_MAP_SIZE (MEM_SIZE_MAP - MEM_EXTRA_SIZE) /* * 128 MiB is min size that fills 32k slots with at least one page in each @@ -47,8 +49,8 @@ * * 2 MiB chunk size like a typical huge page */ -#define MEM_TEST_UNMAP_SIZE (128U << 20) -#define MEM_TEST_UNMAP_CHUNK_SIZE (2U << 20) +#define MEM_TEST_UNMAP_SIZE (128 * SIZE_MiB) +#define MEM_TEST_UNMAP_CHUNK_SIZE SIZE_2MiB /* * For the move active test the middle of the test area is placed on @@ -60,7 +62,7 @@ * last slot contains 100KB memory with the remaining 84KB. Hence, * the maximum size is double of that (200KB) */ -#define MEM_TEST_MOVE_SIZE 0x32000 +#define MEM_TEST_MOVE_SIZE (200 * SIZE_KiB) #define MEM_TEST_MOVE_GPA_DEST (MEM_GPA + MEM_SIZE) static_assert(MEM_TEST_MOVE_SIZE <= MEM_TEST_SIZE, "invalid move test region size"); @@ -799,13 +801,13 @@ static const struct test_data tests[] = { }, { .name = "unmap", - .mem_size = MEM_TEST_UNMAP_SIZE + 4096, + .mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop, }, { .name = "unmap chunked", - .mem_size = MEM_TEST_UNMAP_SIZE + 4096, + .mem_size = MEM_TEST_UNMAP_SIZE + MEM_EXTRA_SIZE, .guest_code = guest_code_test_memslot_unmap, .loop = test_memslot_unmap_loop_chunked, }, @@ -865,8 +867,14 @@ static void help(char *name, struct test_args *targs) static bool check_memory_sizes(void) { + uint32_t host_page_size = getpagesize(); uint32_t guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; + if (host_page_size > SIZE_64KiB || guest_page_size > SIZE_64KiB) { + pr_info("Unsupported page size on host (0x%x) or guest (0x%x)\n", + host_page_size, guest_page_size); + } + if (MEM_SIZE % guest_page_size || MEM_TEST_SIZE % guest_page_size) { pr_info("invalid MEM_SIZE or MEM_TEST_SIZE\n"); -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
* [PATCH v2 6/6] KVM: selftests: memslot_perf_test: Report optimal memory slots 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan ` (4 preceding siblings ...) 2022-10-18 4:04 ` [PATCH v2 5/6] KVM: selftests: memslot_perf_test: Consolidate memory sizes Gavin Shan @ 2022-10-18 4:04 ` Gavin Shan 5 siblings, 0 replies; 7+ messages in thread From: Gavin Shan @ 2022-10-18 4:04 UTC (permalink / raw) To: kvmarm Cc: kvmarm, kvm, linux-kernel, ajones, pbonzini, maz, shuah, oliver.upton, mail, maciej.szmigiero, seanjc, peterx, ricarkol, zhenyzha, shan.gavin The memory area in each slot should be aligned to host page size. Otherwise, the test will fail. For example, the following command fails with the following messages with 64KB-page-size-host and 4KB-pae-size-guest. It's not user friendly to abort the test. Lets do something to report the optimal memory slots, instead of failing the test. # ./memslot_perf_test -v -s 1000 Number of memory slots: 999 Testing map performance with 1 runs, 5 seconds each Adding slots 1..999, each slot with 8 pages + 216 extra pages last ==== Test Assertion Failure ==== lib/kvm_util.c:824: vm_adjust_num_guest_pages(vm->mode, npages) == npages pid=19872 tid=19872 errno=0 - Success 1 0x00000000004065b3: vm_userspace_mem_region_add at kvm_util.c:822 2 0x0000000000401d6b: prepare_vm at memslot_perf_test.c:273 3 (inlined by) test_execute at memslot_perf_test.c:756 4 (inlined by) test_loop at memslot_perf_test.c:994 5 (inlined by) main at memslot_perf_test.c:1073 6 0x0000ffff7ebb4383: ?? ??:0 7 0x00000000004021ff: _start at :? Number of guest pages is not compatible with the host. Try npages=16 Report the optimal memory slots instead of failing the test when the memory area in each slot isn't aligned to host page size. With this applied, the optimal memory slots is reported. # ./memslot_perf_test -v -s 1000 Number of memory slots: 999 Testing map performance with 1 runs, 5 seconds each Memslot count too high for this test, decrease the cap (max is 514) Signed-off-by: Gavin Shan <gshan@redhat.com> --- .../testing/selftests/kvm/memslot_perf_test.c | 45 +++++++++++++++++-- 1 file changed, 41 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c index 3ab385e40bc0..e0f3d9bd5297 100644 --- a/tools/testing/selftests/kvm/memslot_perf_test.c +++ b/tools/testing/selftests/kvm/memslot_perf_test.c @@ -229,16 +229,52 @@ static struct vm_data *alloc_vm(void) return data; } +static bool check_slot_pages(uint32_t host_page_size, uint32_t guest_page_size, + uint64_t pages_per_slot, uint64_t rempages) +{ + if (!pages_per_slot) + return false; + + if ((pages_per_slot * guest_page_size) % host_page_size) + return false; + + if ((rempages * guest_page_size) % host_page_size) + return false; + + return true; +} + + +static uint64_t get_max_slots(struct vm_data *data, uint32_t host_page_size) +{ + uint32_t guest_page_size = data->vm->page_size; + uint64_t mempages, pages_per_slot, rempages; + uint64_t slots; + + mempages = data->npages; + slots = data->nslots; + while (--slots > 1) { + pages_per_slot = mempages / slots; + rempages = mempages % pages_per_slot; + if (check_slot_pages(host_page_size, guest_page_size, + pages_per_slot, rempages)) + return slots + 1; /* slot 0 is reserved */ + } + + return 0; +} + static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, void *guest_code, uint64_t mem_size, struct timespec *slot_runtime) { uint64_t mempages, rempages; uint64_t guest_addr; - uint32_t slot, guest_page_size; + uint32_t slot, host_page_size, guest_page_size; struct timespec tstart; struct sync_area *sync; + host_page_size = getpagesize(); guest_page_size = vm_guest_mode_params[VM_MODE_DEFAULT].page_size; mempages = mem_size / guest_page_size; @@ -250,12 +286,13 @@ static bool prepare_vm(struct vm_data *data, int nslots, uint64_t *maxslots, TEST_ASSERT(data->npages > 1, "Can't test without any memory"); data->nslots = nslots; data->pages_per_slot = data->npages / data->nslots; - if (!data->pages_per_slot) { - *maxslots = data->npages + 1; + rempages = data->npages % data->nslots; + if (!check_slot_pages(host_page_size, guest_page_size, + data->pages_per_slot, rempages)) { + *maxslots = get_max_slots(data, host_page_size); return false; } - rempages = data->npages % data->nslots; data->hva_slots = malloc(sizeof(*data->hva_slots) * data->nslots); TEST_ASSERT(data->hva_slots, "malloc() fail"); -- 2.23.0 ^ permalink raw reply related [flat|nested] 7+ messages in thread
end of thread, other threads:[~2022-10-18 4:06 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2022-10-18 4:04 [PATCH v2 0/6] KVM: selftests: memslot_perf_test: aarch64 cleanup/fixes Gavin Shan 2022-10-18 4:04 ` [PATCH v2 1/6] KVM: selftests: memslot_perf_test: Use data->nslots in prepare_vm() Gavin Shan 2022-10-18 4:04 ` [PATCH v2 2/6] KVM: selftests: memslot_perf_test: Consolidate loop conditions " Gavin Shan 2022-10-18 4:04 ` [PATCH v2 3/6] KVM: selftests: memslot_perf_test: Probe memory slots for once Gavin Shan 2022-10-18 4:04 ` [PATCH v2 4/6] KVM: selftests: memslot_perf_test: Support variable guest page size Gavin Shan 2022-10-18 4:04 ` [PATCH v2 5/6] KVM: selftests: memslot_perf_test: Consolidate memory sizes Gavin Shan 2022-10-18 4:04 ` [PATCH v2 6/6] KVM: selftests: memslot_perf_test: Report optimal memory slots Gavin Shan
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