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Message-Id: <20191216213532.91237-6-bgardon@google.com>
Date: Mon, 16 Dec 2019 13:35:28 -0800
From: Ben Gardon <bgardon@...gle.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-kselftest@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Cannon Matthews <cannonmatthews@...gle.com>,
Peter Xu <peterx@...hat.com>,
Andrew Jones <drjones@...hat.com>,
Ben Gardon <bgardon@...gle.com>
Subject: [PATCH v2 5/8] KVM: selftests: Pass args to vCPU instead of using globals
In preparation for supporting multiple vCPUs in the demand paging test,
pass arguments to the vCPU instead of syncing globals to it.
Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
.../selftests/kvm/demand_paging_test.c | 61 +++++++++++--------
1 file changed, 37 insertions(+), 24 deletions(-)
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index 4aa90a3fce99c..8ede26e088ab6 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -42,7 +42,6 @@
*/
static uint64_t host_page_size;
static uint64_t guest_page_size;
-static uint64_t guest_num_pages;
static char *guest_data_prototype;
@@ -63,14 +62,13 @@ static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
* Continuously write to the first 8 bytes of each page in the demand paging
* memory region.
*/
-static void guest_code(void)
+static void guest_code(uint64_t gva, uint64_t pages)
{
int i;
- for (i = 0; i < guest_num_pages; i++) {
- uint64_t addr = guest_test_virt_mem;
+ for (i = 0; i < pages; i++) {
+ uint64_t addr = gva + (i * guest_page_size);
- addr += i * guest_page_size;
addr &= ~(host_page_size - 1);
*(uint64_t *)addr = 0x0123456789ABCDEF;
}
@@ -82,18 +80,31 @@ static void guest_code(void)
static void *host_test_mem;
static uint64_t host_num_pages;
+struct vcpu_thread_args {
+ uint64_t gva;
+ uint64_t pages;
+ struct kvm_vm *vm;
+ int vcpu_id;
+};
+
static void *vcpu_worker(void *data)
{
int ret;
- struct kvm_vm *vm = data;
+ struct vcpu_thread_args *args = (struct vcpu_thread_args *)data;
+ struct kvm_vm *vm = args->vm;
+ int vcpu_id = args->vcpu_id;
+ uint64_t gva = args->gva;
+ uint64_t pages = args->pages;
struct kvm_run *run;
- run = vcpu_state(vm, VCPU_ID);
+ vcpu_args_set(vm, vcpu_id, 2, gva, pages);
+
+ run = vcpu_state(vm, vcpu_id);
/* Let the guest access its memory */
- ret = _vcpu_run(vm, VCPU_ID);
+ ret = _vcpu_run(vm, vcpu_id);
TEST_ASSERT(ret == 0, "vcpu_run failed: %d\n", ret);
- if (get_ucall(vm, VCPU_ID, NULL) != UCALL_SYNC) {
+ if (get_ucall(vm, vcpu_id, NULL) != UCALL_SYNC) {
TEST_ASSERT(false,
"Invalid guest sync status: exit_reason=%s\n",
exit_reason_str(run->exit_reason));
@@ -269,11 +280,13 @@ static int setup_demand_paging(struct kvm_vm *vm,
#define PAGE_SHIFT_4K 12
static void run_test(enum vm_guest_mode mode, bool use_uffd,
- useconds_t uffd_delay, uint64_t guest_memory_bytes)
+ useconds_t uffd_delay, uint64_t vcpu_wss)
{
pthread_t vcpu_thread;
pthread_t uffd_handler_thread;
struct kvm_vm *vm;
+ struct vcpu_thread_args vcpu_args;
+ uint64_t guest_num_pages;
int r;
/*
@@ -283,16 +296,15 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd,
* number will be enough for all archs. (e.g., 64K page size guest
* will need even less memory for page tables).
*/
- vm = create_vm(mode, VCPU_ID,
- (2 * guest_memory_bytes) >> PAGE_SHIFT_4K,
+ vm = create_vm(mode, VCPU_ID, (2 * vcpu_wss) >> PAGE_SHIFT_4K,
guest_code);
guest_page_size = vm_get_page_size(vm);
- TEST_ASSERT(guest_memory_bytes % guest_page_size == 0,
+ TEST_ASSERT(vcpu_wss % guest_page_size == 0,
"Guest memory size is not guest page size aligned.");
- guest_num_pages = guest_memory_bytes / guest_page_size;
+ guest_num_pages = vcpu_wss / guest_page_size;
#ifdef __s390x__
/* Round up to multiple of 1M (segment size) */
@@ -308,9 +320,9 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd,
guest_num_pages, vm_get_max_gfn(vm));
host_page_size = getpagesize();
- TEST_ASSERT(guest_memory_bytes % host_page_size == 0,
+ TEST_ASSERT(vcpu_wss % host_page_size == 0,
"Guest memory size is not host page size aligned.");
- host_num_pages = guest_memory_bytes / host_page_size;
+ host_num_pages = vcpu_wss / host_page_size;
guest_test_phys_mem = (vm_get_max_gfn(vm) - guest_num_pages) *
guest_page_size;
@@ -354,10 +366,12 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd,
/* Export the shared variables to the guest */
sync_global_to_guest(vm, host_page_size);
sync_global_to_guest(vm, guest_page_size);
- sync_global_to_guest(vm, guest_test_virt_mem);
- sync_global_to_guest(vm, guest_num_pages);
- pthread_create(&vcpu_thread, NULL, vcpu_worker, vm);
+ vcpu_args.vm = vm;
+ vcpu_args.vcpu_id = VCPU_ID;
+ vcpu_args.gva = guest_test_virt_mem;
+ vcpu_args.pages = guest_num_pages;
+ pthread_create(&vcpu_thread, NULL, vcpu_worker, &vcpu_args);
/* Wait for the vcpu thread to quit */
pthread_join(vcpu_thread, NULL);
@@ -404,8 +418,7 @@ static void help(char *name)
printf(" -d: add a delay in usec to the User Fault\n"
" FD handler to simulate demand paging\n"
" overheads. Ignored without -u.\n");
- printf(" -b: specify the number of bytes of memory which should be\n"
- " allocated to the guest.\n");
+ printf(" -b: specify the working set size, in bytes for each vCPU.\n");
puts("");
exit(0);
}
@@ -413,7 +426,7 @@ static void help(char *name)
int main(int argc, char *argv[])
{
bool mode_selected = false;
- uint64_t guest_memory_bytes = DEFAULT_GUEST_TEST_MEM_SIZE;
+ uint64_t vcpu_wss = DEFAULT_GUEST_TEST_MEM_SIZE;
unsigned int mode;
int opt, i;
bool use_uffd = false;
@@ -448,7 +461,7 @@ int main(int argc, char *argv[])
"A negative UFFD delay is not supported.");
break;
case 'b':
- guest_memory_bytes = strtoull(optarg, NULL, 0);
+ vcpu_wss = strtoull(optarg, NULL, 0);
case 'h':
default:
help(argv[0]);
@@ -462,7 +475,7 @@ int main(int argc, char *argv[])
TEST_ASSERT(vm_guest_mode_params[i].supported,
"Guest mode ID %d (%s) not supported.",
i, vm_guest_mode_string(i));
- run_test(i, use_uffd, uffd_delay, guest_memory_bytes);
+ run_test(i, use_uffd, uffd_delay, vcpu_wss);
}
return 0;
--
2.24.1.735.g03f4e72817-goog
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