Re: [PATCH 10/12] conf: Add support for choosing emulation of a TPM 2

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On Tue, May 22, 2018 at 04:44:51PM -0400, Stefan Berger wrote:
This patch extends the TPM's device XML with TPM 2 support. This only works
for the emulator type backend and looks as follows:

   <tpm model='tpm-tis'>
     <backend type='emulator' version='2'/>
   </tpm>

The swtpm process now has --tpm2 as an additional parameter:

system_u:system_r:svirt_t:s0:c597,c632 tss 18477 11.8  0.0 28364  3868 ?        Rs   11:13  13:50 /usr/bin/swtpm socket --daemon --ctrl type=unixio,path=/var/run/libvirt/qemu/swtpm/testvm-swtpm.sock,mode=0660 --tpmstate dir=/var/lib/libvirt/swtpm/testvm/tpm2,mode=0640 --log file=/var/log/swtpm/libvirt/qemu/testvm-swtpm.log --tpm2 --pid file=/var/run/libvirt/qemu/swtpm/testvm-swtpm.pid

The version of the TPM can be changed and the state of the TPM is preserved.

Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>
Reviewed-by: John Ferlan <jferlan@xxxxxxxxxx>
---
docs/formatdomain.html.in                          | 15 ++++-
docs/schemas/domaincommon.rng                      | 12 ++++
src/conf/domain_conf.c                             | 27 ++++++++-
src/conf/domain_conf.h                             |  6 ++
src/qemu/qemu_tpm.c                                | 64 +++++++++++++++++++++-
.../tpm-emulator-tpm2.x86_64-latest.args           | 33 +++++++++++
tests/qemuxml2argvdata/tpm-emulator-tpm2.xml       | 30 ++++++++++
tests/qemuxml2argvtest.c                           |  1 +
tests/qemuxml2xmloutdata/tpm-emulator-tpm2.xml     | 34 ++++++++++++
9 files changed, 217 insertions(+), 5 deletions(-)
create mode 100644 tests/qemuxml2argvdata/tpm-emulator-tpm2.x86_64-latest.args
create mode 100644 tests/qemuxml2argvdata/tpm-emulator-tpm2.xml
create mode 100644 tests/qemuxml2xmloutdata/tpm-emulator-tpm2.xml


@@ -24941,6 +24963,9 @@ virDomainTPMDefFormat(virBufferPtr buf,
    virBufferAsprintf(buf, "<backend type='%s'",
                      virDomainTPMBackendTypeToString(def->type));

+    if (def->version == VIR_DOMAIN_TPM_VERSION_2)
+        virBufferAddLit(buf, " version='2'");
+

Any reason for not formatting version 1.2?
We should format implicit defaults in the XML if possible.

    switch (def->type) {
    case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
        virBufferAddLit(buf, ">\n");
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 92466278ab..e2409899bc 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1291,12 +1291,18 @@ typedef enum {
    VIR_DOMAIN_TPM_TYPE_LAST
} virDomainTPMBackendType;

+typedef enum {
+    VIR_DOMAIN_TPM_VERSION_1_2,
+    VIR_DOMAIN_TPM_VERSION_2,
+} virDomainTPMVersion;

With a corresponding VIR_ENUM_IMPL and VIR_ENUM_DECL,
you can use the *{To,From}String functions for parsing/formatting
the version.

+
# define VIR_DOMAIN_TPM_DEFAULT_DEVICE "/dev/tpm0"

struct _virDomainTPMDef {
    virDomainTPMBackendType type;
    virDomainDeviceInfo info;
    virDomainTPMModel model;
+    virDomainTPMVersion version;
    union {
        struct {
            virDomainChrSourceDef source;
diff --git a/src/qemu/qemu_tpm.c b/src/qemu/qemu_tpm.c
index 11b91aa915..508685c455 100644
--- a/src/qemu/qemu_tpm.c
+++ b/src/qemu/qemu_tpm.c
@@ -54,6 +54,41 @@ static char *swtpm_path;
static char *swtpm_setup;
static char *swtpm_ioctl;

+bool swtpm_supports_tpm2;
+
+/*
+ * qemuTPMCheckForTPM2Support
+ *
+ * Check whether swtpm_setup supports TPM 2
+ */
+static void
+qemuTPMCheckForTPM2Support(void)
+{
+    virCommandPtr cmd;
+    char *help = NULL;
+
+    if (!swtpm_setup)
+        return;
+
+    cmd = virCommandNew(swtpm_setup);
+    if (!cmd)
+        return;
+
+    virCommandAddArg(cmd, "--help");
+    virCommandSetOutputBuffer(cmd, &help);
+
+    if (virCommandRun(cmd, NULL) < 0)
+        goto cleanup;
+
+    if (strstr(help, "--tpm2"))
+        swtpm_supports_tpm2 = true;

This bool is never read.

Given that version 2 has to be requested in the XML and we don't try to
use it automatically, I'd suggest just dropping this function. We don't
need to parse another tool's --help output to make up for the removal
of parsing --help of qemu and qemu-img.

Jano

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