cachepc

commit a4739148e856454028512a8a1b8ce54d1d9dd7bf
parent c840a299c9755a171a120a70d866262e062d5af0
Author: Louis Burda <quent.burda@gmail.com>
Date:   Mon, 29 Aug 2022 21:25:24 +0200

Update

Diffstat:
M
test/.gitignore
 | 
0

M
test/access.c
 | 
0

M
test/eviction.c
 | 
0

M
test/kvm.c
 | 
86
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--

4 files changed, 84 insertions(+), 2 deletions(-)
diff --git a/test/.gitignore b/test/.gitignore
diff --git a/test/access.c b/test/access.c
diff --git a/test/eviction.c b/test/eviction.c
diff --git a/test/kvm.c b/test/kvm.c
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <stdarg.h>
 
 #define ARRLEN(x) (sizeof(x) / sizeof((x)[0]))
 #define MIN(a,b) ((a) > (b) ? (b) : (a))
@@ -244,6 +245,86 @@ kvm_init(size_t ramsize, void *code_start, void *code_stop)
 	if (ret < 0) err(1, "KVM_SET_REGS");
 }
 
+
+int kvm_vm_ioctl(int vmfd, int type, ...)
+{
+    int ret;
+    void *arg;
+    va_list ap;
+
+    va_start(ap, type);
+    arg = va_arg(ap, void *);
+    va_end(ap);
+
+    
+    ret = ioctl(vmfd, type, arg);
+    if (ret == -1) {
+        ret = -errno;
+    }
+    return ret;
+}
+
+
+//VU: Copied the below function from qemu, 
+//e.g. https://github.dev/OpenChannelSSD/qemu-nvme/blob/master/target/i386/sev.c
+//SEe also here: https://www.kernel.org/doc/Documentation/virt/kvm/amd-memory-encryption.rst
+//"The The main ioctl to access SEV is KVM_MEMORY_ENCRYPT_OP. "
+//If non-NULL, the argument to KVM_MEMORY_ENCRYPT_OP must be a struct kvm_sev_cmd::
+/*
+       struct kvm_sev_cmd {
+               __u32 id;
+               __u64 data;
+               __u32 error;
+               __u32 sev_fd;
+       };
+
+
+The ``id`` field contains the subcommand, and the ``data`` field points to
+another struct containing arguments specific to command.  The ``sev_fd``
+should point to a file descriptor that is opened on the ``/dev/sev``
+device, if needed (see individual commands).
+*/
+static int
+sev_ioctl(int fd, int cmd, void *data, int *error)
+{
+    int r;
+    struct kvm_sev_cmd input;
+
+    memset(&input, 0x0, sizeof(input));
+
+    input.id = cmd;
+    input.sev_fd = fd;
+    input.data = (__u64)(unsigned long)data;
+
+    r = kvm_vm_ioctl(kvm.fd, KVM_MEMORY_ENCRYPT_OP, &input);
+
+    if (error) {
+        *error = input.error;
+    }
+
+    return r;
+}
+
+void
+kvm_svm_init()
+{
+	int sev_fd;
+	int fw_error;
+	int status;
+
+	sev_fd = open("/dev/sev", O_RDWR | O_CLOEXEC);
+	if (sev_fd < 0) err(1, "/dev/sev");
+	kvm.fd = open("/dev/kvm", O_RDWR | O_CLOEXEC);
+	if (kvm.fd < 0) err(1, "/dev/kvm");
+	int r = ioctl(kvm.fd, KVM_MEMORY_ENCRYPT_OP, NULL); //sev_ioctl(sev_fd, NULL, NULL, &fw_error);
+	printf("SEV ioctol %d \n",r);
+	printf("fw_error %d \n", fw_error);
+	if (r < 0) err(1,"SEV ioctol");
+
+	//printf("Return code opening /dev/sev %d\n", sev_fd);
+	//printf("Return code 	%d \n", ioctl(sev_fd, KVM_SEV_ES_INIT, NULL));
+}
+
 uint16_t *
 read_counts() 
 {
@@ -330,7 +411,7 @@ main(int argc, const char **argv)
 	pin_process(0, TARGET_CORE, true);
 
 	cachepc_fd = open("/proc/cachepc", O_RDONLY);
-	if (cachepc_fd < 0) err(1, "open");
+	if (cachepc_fd < 0) err(1, "open /proc/cachepc");
 
 	/* init L1 miss counter */
 	arg = 0x000064D8;
@@ -341,7 +422,8 @@ main(int argc, const char **argv)
 	if (!baseline) err(1, "counts");
 	for (k = 0; k < 64; k++)
 		baseline[k] = UINT16_MAX;
-
+	kvm_svm_init();
+	return 0;
 	for (i = 0; i < SAMPLE_COUNT; i++) {
 		counts = collect("without", __start_guest_without, __stop_guest_without);
 		memcpy(without_access[i], counts, 64 * sizeof(uint16_t));