[v8,01/16] misc/xen-ucode: Upload a microcode blob to the hypervisor

Commit Message

Chao Gao Aug. 1, 2019, 10:22 a.m. UTC

This patch provides a tool for late microcode update.

Signed-off-by: Konrad Rzeszutek Wilk <[e-mail]>
Signed-off-by: Chao Gao <[e-mail]>
Acked-by: Andrew Cooper <[e-mail]>
---
Changes in v8:
 - Correct two coding style issues. No functional changes.

Changes in v7:
 - introduce xc_microcode_update() rather than xc_platform_op()
 - avoid creating bounce buffer twice
 - rename xenmicrocode to xen-ucode, following naming tradition
 of other tools there.
---
 tools/libxc/include/xenctrl.h |  1 +
 tools/libxc/xc_misc.c         | 23 ++++++++++++++
 tools/misc/Makefile           |  4 +++
 tools/misc/xen-ucode.c        | 73 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 101 insertions(+)
 create mode 100644 tools/misc/xen-ucode.c

Patch

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 0a7d894..0ff6ed9 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1244,6 +1244,7 @@  typedef uint32_t xc_node_to_node_dist_t;
 int xc_physinfo(xc_interface *xch, xc_physinfo_t *info);
 int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
                    xc_cputopo_t *cputopo);
+int xc_microcode_update(xc_interface *xch, const void *buf, size_t len);
 int xc_numainfo(xc_interface *xch, unsigned *max_nodes,
                 xc_meminfo_t *meminfo, uint32_t *distance);
 int xc_pcitopoinfo(xc_interface *xch, unsigned num_devs,
diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 5e6714a..8e60b6e 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -226,6 +226,29 @@  int xc_physinfo(xc_interface *xch,
     return 0;
 }
 
+int xc_microcode_update(xc_interface *xch, const void *buf, size_t len)
+{
+    int ret;
+    DECLARE_PLATFORM_OP;
+    DECLARE_HYPERCALL_BUFFER(struct xenpf_microcode_update, uc);
+
+    uc = xc_hypercall_buffer_alloc(xch, uc, len);
+    if ( uc == NULL )
+        return -1;
+
+    memcpy(uc, buf, len);
+
+    platform_op.cmd = XENPF_microcode_update;
+    platform_op.u.microcode.length = len;
+    set_xen_guest_handle(platform_op.u.microcode.data, uc);
+
+    ret = do_platform_op(xch, &platform_op);
+
+    xc_hypercall_buffer_free(xch, uc);
+
+    return ret;
+}
+
 int xc_cputopoinfo(xc_interface *xch, unsigned *max_cpus,
                    xc_cputopo_t *cputopo)
 {
diff --git a/tools/misc/Makefile b/tools/misc/Makefile
index d4320dc..63947bf 100644
--- a/tools/misc/Makefile
+++ b/tools/misc/Makefile
@@ -22,6 +22,7 @@  INSTALL_SBIN-$(CONFIG_X86)     += xen-hvmcrash
 INSTALL_SBIN-$(CONFIG_X86)     += xen-hvmctx
 INSTALL_SBIN-$(CONFIG_X86)     += xen-lowmemd
 INSTALL_SBIN-$(CONFIG_X86)     += xen-mfndump
+INSTALL_SBIN-$(CONFIG_X86)     += xen-ucode
 INSTALL_SBIN                   += xencov
 INSTALL_SBIN                   += xenlockprof
 INSTALL_SBIN                   += xenperf
@@ -113,4 +114,7 @@  xen-lowmemd: xen-lowmemd.o
 xencov: xencov.o
 	$(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
 
+xen-ucode: xen-ucode.o
+	$(CC) $(LDFLAGS) -o $@ $< $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
+
 -include $(DEPS_INCLUDE)
diff --git a/tools/misc/xen-ucode.c b/tools/misc/xen-ucode.c
new file mode 100644
index 0000000..2b14194
--- /dev/null
+++ b/tools/misc/xen-ucode.c
@@ -0,0 +1,73 @@ 
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <errno.h>
+#include <string.h>
+#include <inttypes.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <xenctrl.h>
+
+int main(int argc, char *argv[])
+{
+    int fd, len, ret;
+    char *filename, *buf;
+    struct stat st;
+    xc_interface *xch;
+
+    if (argc < 2)
+    {
+        fprintf(stderr,
+                "xen-ucode: Xen microcode updating tool\n"
+                "Usage: %s <microcode blob>\n", argv[0]);
+        return 0;
+    }
+
+    filename = argv[1];
+    fd = open(filename, O_RDONLY);
+    if (fd < 0) {
+        fprintf(stderr, "Could not open %s. (err: %s)\n",
+                filename, strerror(errno));
+        return errno;
+    }
+
+    if (stat(filename, &st) != 0) {
+        fprintf(stderr, "Could not get the size of %s. (err: %s)\n",
+                filename, strerror(errno));
+        return errno;
+    }
+
+    len = st.st_size;
+    buf = mmap(0, len, PROT_READ, MAP_PRIVATE, fd, 0);
+    if (buf == MAP_FAILED) {
+        fprintf(stderr, "mmap failed. (error: %s)\n", strerror(errno));
+        return errno;
+    }
+
+    xch = xc_interface_open(0,0,0);
+    if (xch == NULL)
+    {
+        fprintf(stderr, "Error opening xc interface. (err: %s)\n",
+                strerror(errno));
+        return errno;
+    }
+
+    ret = xc_microcode_update(xch, buf, len);
+    if (ret)
+        fprintf(stderr, "Failed to update microcode. (err: %s)\n",
+                strerror(errno));
+
+    xc_interface_close(xch);
+
+    if (munmap(buf, len)) {
+        printf("Could not unmap: %d(%s)\n", errno, strerror(errno));
+        return errno;
+    }
+    close(fd);
+
+    return 0;
+}