Pass the TPM file descriptor to QEMU via command line.
Instead of passing /dev/tpm0 we now pass /dev/fdset/10 and the additional
parameters -add-fd set=10,fd=20.
This addresses the use case when QEMU is started with non-root privileges
and QEMU cannot open /dev/tpm0 for example.
Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>
---
src/qemu/qemu_command.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 117 insertions(+), 4 deletions(-)
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d6bc294..4c6b76d 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -161,6 +161,58 @@ VIR_ENUM_IMPL(qemuNumaPolicy, VIR_DOMAIN_NUMATUNE_MEM_LAST,
"interleave");
/**
+ * qemuVirCommandGetFDSet:
+ * @cmd: the command to modify
+ * @fd: fd to reassign to the child
+ *
+ * Get the parameters for the QEMU -add-fd command line option
+ * for the given file descriptor. The file descriptor must previously
+ * have been 'transferred' in a virCommandPassFD() call.
+ * This function for example returns "set=10,fd=20".
+ */
+static char *
+qemuVirCommandGetFDSet(virCommandPtr cmd, int fd)
+{
+ char *result = NULL;
+ int idx = virCommandPassFDGetFDIndex(cmd, fd);
+
+ if (idx >= 0) {
+ ignore_value(virAsprintf(&result, "set=%d,fd=%d", idx, fd));
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("file descriptor %d has not been transferred"), fd);
+ }
+
+ return result;
+}
+
+/**
+ * qemuVirCommandGetDevSet:
+ * @cmd: the command to modify
+ * @fd: fd to reassign to the child
+ *
+ * Get the parameters for the QEMU path= parameter where a file
+ * descriptor is accessed via a file descriptor set, for example
+ * /dev/fdset/10. The file descriptor must previously have been
+ * 'transferred' in a virCommandPassFD() call.
+ */
+static char *
+qemuVirCommandGetDevSet(virCommandPtr cmd, int fd)
+{
+ char *result = NULL;
+ int idx = virCommandPassFDGetFDIndex(cmd, fd);
+
+ if (idx >= 0) {
+ ignore_value(virAsprintf(&result, "/dev/fdset/%d", idx));
+ } else {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("file descriptor %d has not been transferred"), fd);
+ }
+ return result;
+}
+
+
+/**
* qemuPhysIfaceConnect:
* @def: the definition of the VM (needed by 802.1Qbh and audit)
* @driver: pointer to the driver instance
@@ -6321,15 +6373,20 @@ qemuBuildRNGDevStr(virDomainDefPtr def,
static char *qemuBuildTPMBackendStr(const virDomainDef *def,
+ virCommandPtr cmd,
virQEMUCapsPtr qemuCaps,
- const char *emulator)
+ const char *emulator,
+ int *tpmfd, int *cancelfd)
{
const virDomainTPMDef *tpm = def->tpm;
virBuffer buf = VIR_BUFFER_INITIALIZER;
const char *type = virDomainTPMBackendTypeToString(tpm->type);
- char *cancel_path;
+ char *cancel_path = NULL, *devset = NULL;
const char *tpmdev;
+ *tpmfd = -1;
+ *cancelfd = -1;
+
virBufferAsprintf(&buf, "%s,id=tpm-%s", type, tpm->info.alias);
switch (tpm->type) {
@@ -6341,11 +6398,42 @@ static char *qemuBuildTPMBackendStr(const virDomainDef *def,
if (!(cancel_path = virTPMCreateCancelPath(tpmdev)))
goto error;
+ if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_ADD_FD)) {
+ *tpmfd = open(tpmdev, O_RDWR);
+ if (*tpmfd < 0) {
+ virReportSystemError(errno, _("Could not open TPM device %s"),
+ tpmdev);
+ goto error;
+ }
+
+ virCommandPassFD(cmd, *tpmfd,
+ VIR_COMMAND_PASS_FD_CLOSE_PARENT);
+ devset = qemuVirCommandGetDevSet(cmd, *tpmfd);
+ if (devset == NULL)
+ goto error;
+
+ *cancelfd = open(cancel_path, O_WRONLY);
+ if (*cancelfd < 0) {
+ virReportSystemError(errno,
+ _("Could not open TPM device's cancel "
+ "path %s"), cancel_path);
+ goto error;
+ }
+ VIR_FREE(cancel_path);
+
+ virCommandPassFD(cmd, *cancelfd,
+ VIR_COMMAND_PASS_FD_CLOSE_PARENT);
+ cancel_path = qemuVirCommandGetDevSet(cmd, *cancelfd);
+ if (cancel_path == NULL)
+ goto error;
+ }
virBufferAddLit(&buf, ",path=");
- virBufferEscape(&buf, ',', ",", "%s", tpmdev);
+ virBufferEscape(&buf, ',', ",", "%s", devset ? devset : tpmdev);
virBufferAddLit(&buf, ",cancel-path=");
virBufferEscape(&buf, ',', ",", "%s", cancel_path);
+
+ VIR_FREE(devset);
VIR_FREE(cancel_path);
break;
@@ -6365,6 +6453,9 @@ static char *qemuBuildTPMBackendStr(const virDomainDef *def,
emulator, type);
error:
+ VIR_FREE(devset);
+ VIR_FREE(cancel_path);
+
virBufferFreeAndReset(&buf);
return NULL;
}
@@ -8198,13 +8289,35 @@ qemuBuildTPMCommandLine(virDomainDefPtr def,
const char *emulator)
{
char *optstr;
+ int tpmfd = -1;
+ int cancelfd = -1;
+ char *fdset;
- if (!(optstr = qemuBuildTPMBackendStr(def, qemuCaps, emulator)))
+ if (!(optstr = qemuBuildTPMBackendStr(def, cmd, qemuCaps, emulator,
+ &tpmfd, &cancelfd)))
return -1;
virCommandAddArgList(cmd, "-tpmdev", optstr, NULL);
VIR_FREE(optstr);
+ if (tpmfd >= 0) {
+ fdset = qemuVirCommandGetFDSet(cmd, tpmfd);
+ if (!fdset)
+ return -1;
+
+ virCommandAddArgList(cmd, "-add-fd", fdset, NULL);
+ VIR_FREE(fdset);
+ }
+
+ if (cancelfd >= 0) {
+ fdset = qemuVirCommandGetFDSet(cmd, cancelfd);
+ if (!fdset)
+ return -1;
+
+ virCommandAddArgList(cmd, "-add-fd", fdset, NULL);
+ VIR_FREE(fdset);
+ }
+
if (!(optstr = qemuBuildTPMDevStr(def, qemuCaps, emulator)))
return -1;
--
1.9.3
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