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From: Ben Gardon <bgardon@google.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Cannon Matthews <cannonmatthews@google.com>,
	Peter Xu <peterx@redhat.com>, Andrew Jones <drjones@redhat.com>,
	Peter Shier <pshier@google.com>, Oliver Upton <oupton@google.com>,
	Ben Gardon <bgardon@google.com>
Subject: [PATCH v4 05/10] KVM: selftests: Pass args to vCPU in global vCPU args struct
Date: Thu, 23 Jan 2020 10:04:31 -0800
Message-ID: <20200123180436.99487-6-bgardon@google.com> (raw)
In-Reply-To: <20200123180436.99487-1-bgardon@google.com>

In preparation for supporting multiple vCPUs in the demand paging test,
pass arguments to the vCPU in a consolidated global struct instead of
syncing multiple globals.

Signed-off-by: Ben Gardon <bgardon@google.com>
---
 .../selftests/kvm/demand_paging_test.c        | 38 +++++++++++++------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index 9d7514e96a639..9e2a5f7dfa140 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;
 
@@ -59,18 +58,30 @@ static uint64_t guest_test_phys_mem;
  */
 static uint64_t guest_test_virt_mem = DEFAULT_GUEST_TEST_MEM;
 
+struct vcpu_args {
+	uint64_t gva;
+	uint64_t pages;
+
+	/* Only used by the host userspace part of the vCPU thread */
+	int vcpu_id;
+	struct kvm_vm *vm;
+};
+
+static struct vcpu_args vcpu_args;
+
 /*
  * Continuously write to the first 8 bytes of each page in the demand paging
  * memory region.
  */
 static void guest_code(void)
 {
+	uint64_t gva = vcpu_args.gva;
+	uint64_t pages = vcpu_args.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;
 	}
@@ -85,15 +96,16 @@ static uint64_t host_num_pages;
 static void *vcpu_worker(void *data)
 {
 	int ret;
-	struct kvm_vm *vm = data;
+	struct kvm_vm *vm = vcpu_args.vm;
+	int vcpu_id = vcpu_args.vcpu_id;
 	struct kvm_run *run;
 
-	run = vcpu_state(vm, VCPU_ID);
+	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));
@@ -285,6 +297,7 @@ static void run_test(enum vm_guest_mode mode, bool use_uffd,
 	pthread_t uffd_handler_thread;
 	int pipefd[2];
 	struct kvm_vm *vm;
+	uint64_t guest_num_pages;
 	int r;
 
 	/*
@@ -370,10 +383,13 @@ 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;
+	sync_global_to_guest(vm, vcpu_args);
+	pthread_create(&vcpu_thread, NULL, vcpu_worker, &vcpu_args);
 
 	/* Wait for the vcpu thread to quit */
 	pthread_join(vcpu_thread, NULL);
-- 
2.25.0.341.g760bfbb309-goog


  parent reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-23 18:04 [PATCH v4 00/10] Create a userfaultfd demand paging test Ben Gardon
2020-01-23 18:04 ` [PATCH v4 01/10] KVM: selftests: Create a " Ben Gardon
2020-01-24  9:49   ` Andrew Jones
2020-01-27  9:18   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 02/10] KVM: selftests: Add demand paging content to the " Ben Gardon
2020-01-23 18:04 ` [PATCH v4 03/10] KVM: selftests: Add configurable demand paging delay Ben Gardon
2020-01-23 18:04 ` [PATCH v4 04/10] KVM: selftests: Add memory size parameter to the demand paging test Ben Gardon
2020-01-24 10:01   ` Andrew Jones
2020-01-23 18:04 ` Ben Gardon [this message]
2020-01-23 18:04 ` [PATCH v4 06/10] KVM: selftests: Add support for vcpu_args_set to aarch64 and s390x Ben Gardon
2020-01-24  9:03   ` Paolo Bonzini
2020-01-24  9:35     ` Andrew Jones
2020-01-24  9:44       ` Paolo Bonzini
2020-01-24 10:45       ` Andrew Jones
2020-01-24 18:33     ` Christian Borntraeger
2020-01-25  9:34   ` Paolo Bonzini
2020-01-27  8:38     ` Andrew Jones
2020-01-27  9:01   ` Thomas Huth
2020-01-23 18:04 ` [PATCH v4 07/10] KVM: selftests: Support multiple vCPUs in demand paging test Ben Gardon
2020-01-24 10:16   ` Andrew Jones
2020-01-24 10:49   ` Andrew Jones
2020-01-25  9:39     ` Paolo Bonzini
2020-01-27  8:39       ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 08/10] KVM: selftests: Time guest demand paging Ben Gardon
2020-01-24 10:21   ` Andrew Jones
2020-01-23 18:04 ` [PATCH v4 09/10] KVM: selftests: Stop memslot creation in KVM internal memslot region Ben Gardon
2020-01-24  8:58   ` Paolo Bonzini
2020-01-24 18:41     ` Ben Gardon
2020-01-25  9:37       ` Paolo Bonzini
2020-01-27 17:28         ` Ben Gardon
2020-01-23 18:04 ` [PATCH v4 10/10] KVM: selftests: Move memslot 0 above KVM internal memslots Ben Gardon
2020-01-24  9:01   ` Paolo Bonzini
2020-01-24 18:53     ` Ben Gardon
2020-01-27  9:42   ` Thomas Huth
2020-01-24  9:03 ` [PATCH v4 00/10] Create a userfaultfd demand paging test Paolo Bonzini

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