Added RandomX option "wrmsr" with command line equivalent --randomx-wrmsr=N.

src/crypto/rx/Rx_linux.cpp

@@ -0,0 +1,114 @@
+/* XMRig
+ * Copyright 2010      Jeff Garzik              <jgarzik@pobox.com>
+ * Copyright 2012-2014 pooler                   <pooler@litecoinpool.org>
+ * Copyright 2014      Lucas Jones              <https://github.com/lucasjones>
+ * Copyright 2014-2016 Wolf9466                 <https://github.com/OhGodAPet>
+ * Copyright 2016      Jay D Dee                <jayddee246@gmail.com>
+ * Copyright 2017-2019 XMR-Stak                 <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
+ * Copyright 2018      Lee Clagett              <https://github.com/vtnerd>
+ * Copyright 2018-2019 tevador                  <tevador@gmail.com>
+ * Copyright 2018-2019 SChernykh                <https://github.com/SChernykh>
+ * Copyright 2000      Transmeta Corporation    <https://github.com/intel/msr-tools>
+ * Copyright 2004-2008 H. Peter Anvin           <https://github.com/intel/msr-tools>
+ * Copyright 2016-2019 XMRig                    <https://github.com/xmrig>, <support@xmrig.com>
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "crypto/rx/Rx.h"
+#include "backend/common/Tags.h"
+#include "backend/cpu/Cpu.h"
+#include "base/io/log/Log.h"
+#include "crypto/rx/RxConfig.h"
+
+
+#include <cctype>
+#include <cinttypes>
+#include <cstdio>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+
+namespace xmrig {
+
+
+static inline int dir_filter(const struct dirent *dirp)
+{
+    return isdigit(dirp->d_name[0]) ? 1 : 0;
+}
+
+
+static bool wrmsr_on_cpu(uint32_t reg, uint32_t cpu, uint64_t value)
+{
+    char msr_file_name[64]{};
+
+    sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu);
+    int fd = open(msr_file_name, O_WRONLY);
+    if (fd < 0) {
+        return false;
+    }
+
+    const bool success = pwrite(fd, &value, sizeof value, reg) == sizeof value;
+
+    close(fd);
+
+    return success;
+}
+
+
+static bool wrmsr_on_all_cpus(uint32_t reg, uint64_t value)
+{
+    struct dirent **namelist;
+    int dir_entries = scandir("/dev/cpu", &namelist, dir_filter, 0);
+    int errors      = 0;
+
+    while (dir_entries--) {
+        if (!wrmsr_on_cpu(reg, strtoul(namelist[dir_entries]->d_name, nullptr, 10), value)) {
+            ++errors;
+        }
+
+        free(namelist[dir_entries]);
+    }
+
+    free(namelist);
+
+    if (errors) {
+        LOG_WARN(CLEAR "%s" YELLOW_BOLD_S "cannot set MSR 0x%04" PRIx32 " to 0x%04" PRIx64, rx_tag(), reg, value);
+    }
+
+    return errors == 0;
+}
+
+
+} // namespace xmrig
+
+
+void xmrig::Rx::osInit(const RxConfig &config)
+{
+    if (config.wrmsr() < 0 || Cpu::info()->vendor() != ICpuInfo::VENDOR_INTEL) {
+        return;
+    }
+
+    if (system("/sbin/modprobe msr > /dev/null 2>&1") != 0) {
+        LOG_WARN(CLEAR "%s" YELLOW_BOLD_S "msr kernel module is not available", rx_tag());
+
+        return;
+    }
+
+    wrmsr_on_all_cpus(0x1a4, config.wrmsr());
+}