From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This command returns the TSC frequency (in HZ) for the specified
vCPU if available (otherwise it returns zero).
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Co-developed-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
Documentation/virt/kvm/kvmi.rst | 29 ++++
arch/x86/include/asm/kvmi_host.h | 2 +
arch/x86/include/uapi/asm/kvmi.h | 13 ++
arch/x86/kvm/kvmi_msg.c | 14 ++
include/uapi/linux/kvmi.h | 2 +
.../testing/selftests/kvm/x86_64/kvmi_test.c | 144 +++++++++++++++++-
virt/kvm/introspection/kvmi_int.h | 3 +
virt/kvm/introspection/kvmi_msg.c | 9 ++
8 files changed, 215 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/include/uapi/asm/kvmi.h
diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst
index 4d340528d2f4..902ced4dd0c4 100644
--- a/Documentation/virt/kvm/kvmi.rst
+++ b/Documentation/virt/kvm/kvmi.rst
@@ -441,6 +441,35 @@ one page (offset + size <= PAGE_SIZE).
* -KVM_EINVAL - the specified gpa/size pair is invalid
* -KVM_EINVAL - the padding is not zero
+8. KVMI_VCPU_GET_INFO
+---------------------
+
+:Architectures: x86
+:Versions: >= 1
+:Parameters:
+
+::
+
+ struct kvmi_vcpu_hdr;
+
+:Returns:
+
+::
+
+ struct kvmi_error_code;
+ struct kvmi_vcpu_get_info_reply {
+ __u64 tsc_speed;
+ };
+
+Returns the TSC frequency (in HZ) for the specified vCPU if available
+(otherwise it returns zero).
+
+:Errors:
+
+* -KVM_EINVAL - the padding is not zero
+* -KVM_EINVAL - the selected vCPU is invalid
+* -KVM_EAGAIN - the selected vCPU can't be introspected yet
+
Events
======
diff --git a/arch/x86/include/asm/kvmi_host.h b/arch/x86/include/asm/kvmi_host.h
index 360a57dd9019..05ade3a16b24 100644
--- a/arch/x86/include/asm/kvmi_host.h
+++ b/arch/x86/include/asm/kvmi_host.h
@@ -2,6 +2,8 @@
#ifndef _ASM_X86_KVMI_HOST_H
#define _ASM_X86_KVMI_HOST_H
+#include <asm/kvmi.h>
+
struct kvm_vcpu_arch_introspection {
};
diff --git a/arch/x86/include/uapi/asm/kvmi.h b/arch/x86/include/uapi/asm/kvmi.h
new file mode 100644
index 000000000000..2b6192e1a9a4
--- /dev/null
+++ b/arch/x86/include/uapi/asm/kvmi.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _UAPI_ASM_X86_KVMI_H
+#define _UAPI_ASM_X86_KVMI_H
+
+/*
+ * KVM introspection - x86 specific structures and definitions
+ */
+
+struct kvmi_vcpu_get_info_reply {
+ __u64 tsc_speed;
+};
+
+#endif /* _UAPI_ASM_X86_KVMI_H */
diff --git a/arch/x86/kvm/kvmi_msg.c b/arch/x86/kvm/kvmi_msg.c
index 0f4717ca5fa8..77552bf50984 100644
--- a/arch/x86/kvm/kvmi_msg.c
+++ b/arch/x86/kvm/kvmi_msg.c
@@ -8,7 +8,21 @@
#include "../../../virt/kvm/introspection/kvmi_int.h"
+static int handle_vcpu_get_info(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg,
+ const void *req)
+{
+ struct kvmi_vcpu_get_info_reply rpl;
+
+ memset(&rpl, 0, sizeof(rpl));
+ if (kvm_has_tsc_control)
+ rpl.tsc_speed = 1000ul * job->vcpu->arch.virtual_tsc_khz;
+
+ return kvmi_msg_vcpu_reply(job, msg, 0, &rpl, sizeof(rpl));
+}
+
static kvmi_vcpu_msg_job_fct const msg_vcpu[] = {
+ [KVMI_VCPU_GET_INFO] = handle_vcpu_get_info,
};
kvmi_vcpu_msg_job_fct kvmi_arch_vcpu_msg_handler(u16 id)
diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h
index 7ba1c8758aba..da766427231e 100644
--- a/include/uapi/linux/kvmi.h
+++ b/include/uapi/linux/kvmi.h
@@ -31,6 +31,8 @@ enum {
};
enum {
+ KVMI_VCPU_GET_INFO = KVMI_VCPU_MESSAGE_ID(1),
+
KVMI_NEXT_VCPU_MESSAGE
};
diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
index b493edb534b0..9350ba8b7f9b 100644
--- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c
+++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c
@@ -9,6 +9,7 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
+#include <pthread.h>
#include "test_util.h"
@@ -18,6 +19,7 @@
#include "linux/kvm_para.h"
#include "linux/kvmi.h"
+#include "asm/kvmi.h"
#define VCPU_ID 1
@@ -25,12 +27,46 @@ static int socket_pair[2];
#define Kvm_socket socket_pair[0]
#define Userspace_socket socket_pair[1]
+static int test_id;
static vm_vaddr_t test_gva;
static void *test_hva;
static vm_paddr_t test_gpa;
static int page_size;
+struct vcpu_worker_data {
+ struct kvm_vm *vm;
+ int vcpu_id;
+ int test_id;
+};
+
+enum {
+ GUEST_TEST_NOOP = 0,
+};
+
+#define GUEST_REQUEST_TEST() GUEST_SYNC(0)
+#define GUEST_SIGNAL_TEST_DONE() GUEST_SYNC(1)
+
+#define HOST_SEND_TEST(uc) (uc.cmd == UCALL_SYNC && uc.args[1] == 0)
+#define HOST_TEST_DONE(uc) (uc.cmd == UCALL_SYNC && uc.args[1] == 1)
+
+static int guest_test_id(void)
+{
+ GUEST_REQUEST_TEST();
+ return READ_ONCE(test_id);
+}
+
+static void guest_code(void)
+{
+ while (true) {
+ switch (guest_test_id()) {
+ case GUEST_TEST_NOOP:
+ break;
+ }
+ GUEST_SIGNAL_TEST_DONE();
+ }
+}
+
void setup_socket(void)
{
int r;
@@ -530,6 +566,111 @@ static void test_memory_access(struct kvm_vm *vm)
read_invalid_guest_page(vm);
}
+static void *vcpu_worker(void *data)
+{
+ struct vcpu_worker_data *ctx = data;
+ struct kvm_run *run;
+
+ run = vcpu_state(ctx->vm, ctx->vcpu_id);
+
+ while (true) {
+ struct ucall uc;
+
+ vcpu_run(ctx->vm, ctx->vcpu_id);
+
+ TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
+ "vcpu_run() failed, test_id %d, exit reason %u (%s)\n",
+ ctx->test_id, run->exit_reason,
+ exit_reason_str(run->exit_reason));
+
+ TEST_ASSERT(get_ucall(ctx->vm, ctx->vcpu_id, &uc),
+ "No guest request\n");
+
+ if (HOST_SEND_TEST(uc)) {
+ test_id = READ_ONCE(ctx->test_id);
+ sync_global_to_guest(ctx->vm, test_id);
+ } else if (HOST_TEST_DONE(uc)) {
+ break;
+ }
+ }
+
+ return NULL;
+}
+
+static pthread_t start_vcpu_worker(struct vcpu_worker_data *data)
+{
+ pthread_t thread_id;
+
+ pthread_create(&thread_id, NULL, vcpu_worker, data);
+
+ return thread_id;
+}
+
+static void wait_vcpu_worker(pthread_t vcpu_thread)
+{
+ pthread_join(vcpu_thread, NULL);
+}
+
+static int do_vcpu_command(struct kvm_vm *vm, int cmd_id,
+ struct kvmi_msg_hdr *req, size_t req_size,
+ void *rpl, size_t rpl_size)
+{
+ struct vcpu_worker_data data = {.vm = vm, .vcpu_id = VCPU_ID };
+ pthread_t vcpu_thread;
+ int r;
+
+ vcpu_thread = start_vcpu_worker(&data);
+
+ r = do_command(cmd_id, req, req_size, rpl, rpl_size);
+
+ wait_vcpu_worker(vcpu_thread);
+ return r;
+}
+
+static int do_vcpu0_command(struct kvm_vm *vm, int cmd_id,
+ struct kvmi_msg_hdr *req, size_t req_size,
+ void *rpl, size_t rpl_size)
+{
+ struct kvmi_vcpu_hdr *vcpu_hdr = (struct kvmi_vcpu_hdr *)(req + 1);
+
+ vcpu_hdr->vcpu = 0;
+
+ return do_vcpu_command(vm, cmd_id, req, req_size, rpl, rpl_size);
+}
+
+static void test_vcpu0_command(struct kvm_vm *vm, int cmd_id,
+ struct kvmi_msg_hdr *req, size_t req_size,
+ void *rpl, size_t rpl_size,
+ int expected_err)
+{
+ int r;
+
+ r = do_vcpu0_command(vm, cmd_id, req, req_size, rpl, rpl_size);
+ TEST_ASSERT(r == expected_err,
+ "Command %d failed, error %d (%s) instead of %d (%s)\n",
+ cmd_id, -r, kvm_strerror(-r),
+ expected_err, kvm_strerror(expected_err));
+}
+
+static void test_cmd_vcpu_get_info(struct kvm_vm *vm)
+{
+ struct {
+ struct kvmi_msg_hdr hdr;
+ struct kvmi_vcpu_hdr vcpu_hdr;
+ } req = {};
+ struct kvmi_vcpu_get_info_reply rpl;
+ int cmd_id = KVMI_VCPU_GET_INFO;
+
+ test_vcpu0_command(vm, cmd_id, &req.hdr, sizeof(req),
+ &rpl, sizeof(rpl), 0);
+
+ pr_debug("tsc_speed: %llu HZ\n", rpl.tsc_speed);
+
+ req.vcpu_hdr.vcpu = 99;
+ test_vm_command(cmd_id, &req.hdr, sizeof(req),
+ &rpl, sizeof(rpl), -KVM_EINVAL);
+}
+
static void test_introspection(struct kvm_vm *vm)
{
srandom(time(0));
@@ -544,6 +685,7 @@ static void test_introspection(struct kvm_vm *vm)
test_event_unhook(vm);
test_cmd_vm_control_events(vm);
test_memory_access(vm);
+ test_cmd_vcpu_get_info(vm);
unhook_introspection(vm);
}
@@ -566,7 +708,7 @@ int main(int argc, char *argv[])
exit(KSFT_SKIP);
}
- vm = vm_create_default(VCPU_ID, 0, NULL);
+ vm = vm_create_default(VCPU_ID, 0, guest_code);
vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
page_size = getpagesize();
diff --git a/virt/kvm/introspection/kvmi_int.h b/virt/kvm/introspection/kvmi_int.h
index c3e4da7e7f20..126e72201518 100644
--- a/virt/kvm/introspection/kvmi_int.h
+++ b/virt/kvm/introspection/kvmi_int.h
@@ -32,6 +32,9 @@ void kvmi_sock_shutdown(struct kvm_introspection *kvmi);
void kvmi_sock_put(struct kvm_introspection *kvmi);
bool kvmi_msg_process(struct kvm_introspection *kvmi);
int kvmi_msg_send_unhook(struct kvm_introspection *kvmi);
+int kvmi_msg_vcpu_reply(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg, int err,
+ const void *rpl, size_t rpl_size);
/* kvmi.c */
void *kvmi_msg_alloc(void);
diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c
index 6f2fe245a8b1..efd04b4aa4ff 100644
--- a/virt/kvm/introspection/kvmi_msg.c
+++ b/virt/kvm/introspection/kvmi_msg.c
@@ -105,6 +105,15 @@ static int kvmi_msg_vm_reply(struct kvm_introspection *kvmi,
return kvmi_msg_reply(kvmi, msg, err, rpl, rpl_size);
}
+int kvmi_msg_vcpu_reply(const struct kvmi_vcpu_msg_job *job,
+ const struct kvmi_msg_hdr *msg, int err,
+ const void *rpl, size_t rpl_size)
+{
+ struct kvm_introspection *kvmi = KVMI(job->vcpu->kvm);
+
+ return kvmi_msg_reply(kvmi, msg, err, rpl, rpl_size);
+}
+
static struct kvm_vcpu *kvmi_get_vcpu(struct kvm_introspection *kvmi,
unsigned int vcpu_idx)
{
