[libvirt] [PATCH 3/4] libvirt: qemu: enable/disable protected key management ops
akrowiak at linux.vnet.ibm.com
akrowiak at linux.vnet.ibm.com
Thu May 7 15:52:57 UTC 2015
From: Tony Krowiak <aekrowia at us.ibm.com>
Introduces two new -machine option parameters to the QEMU command to
enable/disable the CPACF protected key management operations for a guest:
aes-key-wrap='on|off'
dea-key-wrap='on|off'
The QEMU code maps the corresponding domain configuration elements to the
QEMU -machine option parameters to create the QEMU command:
<cipher name='aes' state='on'> --> aes-key-wrap=on
<cipher name='aes' state='off'> --> aes-key-wrap=off
<cipher name='dea' state='on'> --> dea-key-wrap=on
<cipher name='dea' state='off'> --> dea-key-wrap=off
Signed-off-by: Tony Krowiak <akrowiak at linux.vnet.ibm.com>
Signed-off-by: Daniel Hansel <daniel.hansel at linux.vnet.ibm.com>
Signed-off-by: Boris Fiuczynski <fiuczy at linux.vnet.ibm.com>
Reviewed-by: Boris Fiuczynski <fiuczy at linux.vnet.ibm.com>
---
src/qemu/qemu_capabilities.c | 5 +++
src/qemu/qemu_capabilities.h | 2 +
src/qemu/qemu_command.c | 72 ++++++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_domain.c | 39 ++++++++++++++++++++++-
4 files changed, 117 insertions(+), 1 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index a458611..d1b9f6f 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -279,6 +279,9 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
"qxl.vgamem_mb",
"qxl-vga.vgamem_mb",
"pc-dimm",
+
+ "aes-key-wrap", /* 185 */
+ "dea-key-wrap",
);
@@ -2518,6 +2521,8 @@ static struct virQEMUCapsCommandLineProps virQEMUCapsCommandLine[] = {
{ "msg", "timestamp", QEMU_CAPS_MSG_TIMESTAMP },
{ "numa", NULL, QEMU_CAPS_NUMA },
{ "drive", "throttling.bps-total-max", QEMU_CAPS_DRIVE_IOTUNE_MAX},
+ { "machine", "aes-key-wrap", QEMU_CAPS_AES_KEY_WRAP },
+ { "machine", "dea-key-wrap", QEMU_CAPS_DEA_KEY_WRAP },
};
static int
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index c7b1ac7..31e0494 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -224,6 +224,8 @@ typedef enum {
QEMU_CAPS_QXL_VGAMEM = 182, /* -device qxl.vgamem_mb */
QEMU_CAPS_QXL_VGA_VGAMEM = 183, /* -device qxl-vga.vgamem_mb */
QEMU_CAPS_DEVICE_PC_DIMM = 184, /* pc-dimm device */
+ QEMU_CAPS_AES_KEY_WRAP = 185, /* -machine aes_key_wrap */
+ QEMU_CAPS_DEA_KEY_WRAP = 186, /* -machine dea_key_wrap */
QEMU_CAPS_LAST, /* this must always be the last item */
} virQEMUCapsFlags;
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 247954f..8ff1d88 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -38,6 +38,7 @@
#include "virnetdevbridge.h"
#include "virstring.h"
#include "virtime.h"
+#include "virutil.h"
#include "viruuid.h"
#include "c-ctype.h"
#include "domain_nwfilter.h"
@@ -7295,6 +7296,39 @@ qemuBuildObsoleteAccelArg(virCommandPtr cmd,
return 0;
}
+static bool
+qemuAppendKeyWrapMachineParm(virBuffer *buf, virQEMUCapsPtr qemuCaps,
+ int flag, const char *pname, int pstate)
+{
+ if (pstate != VIR_TRISTATE_SWITCH_ABSENT) {
+ if (!virQEMUCapsGet(qemuCaps, flag)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ _("%s is not available with this QEMU binary"), pname);
+ return false;
+ }
+
+ virBufferAsprintf(buf, ",%s=%s", pname,
+ virTristateSwitchTypeToString(pstate));
+ }
+
+ return true;
+}
+
+static bool
+qemuAppendKeyWrapMachineParms(virBuffer *buf, virQEMUCapsPtr qemuCaps,
+ const virDomainDef *def)
+{
+ if (!qemuAppendKeyWrapMachineParm(buf, qemuCaps, QEMU_CAPS_AES_KEY_WRAP,
+ "aes-key-wrap", def->keywrap.aes))
+ return false;
+
+ if (!qemuAppendKeyWrapMachineParm(buf, qemuCaps, QEMU_CAPS_DEA_KEY_WRAP,
+ "dea-key-wrap", def->keywrap.dea))
+ return false;
+
+ return true;
+}
+
static int
qemuBuildMachineArgStr(virCommandPtr cmd,
const virDomainDef *def,
@@ -7329,6 +7363,14 @@ qemuBuildMachineArgStr(virCommandPtr cmd,
}
obsoleteAccel = true;
+
+ if ((def->keywrap.aes != VIR_TRISTATE_SWITCH_ABSENT) ||
+ (def->keywrap.dea != VIR_TRISTATE_SWITCH_ABSENT)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("key wrap support is not available "
+ "with this QEMU binary"));
+ return -1;
+ }
} else {
virBuffer buf = VIR_BUFFER_INITIALIZER;
@@ -7373,6 +7415,11 @@ qemuBuildMachineArgStr(virCommandPtr cmd,
}
}
+ if (!qemuAppendKeyWrapMachineParms(&buf, qemuCaps, def)) {
+ virBufferFreeAndReset(&buf);
+ return -1;
+ }
+
virCommandAddArgBuffer(cmd, &buf);
}
@@ -12772,6 +12819,9 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
}
/* handle all remaining "-machine" parameters */
+ def->keywrap.aes = VIR_TRISTATE_SWITCH_ABSENT;
+ def->keywrap.dea = VIR_TRISTATE_SWITCH_ABSENT;
+
while ((param = list[j++])) {
if (STRPREFIX(param, "dump-guest-core=")) {
param += strlen("dump-guest-core=");
@@ -12783,6 +12833,28 @@ qemuParseCommandLine(virCapsPtr qemuCaps,
} else if (STRPREFIX(param, "accel=kvm")) {
def->virtType = VIR_DOMAIN_VIRT_KVM;
def->features[VIR_DOMAIN_FEATURE_PAE] = VIR_TRISTATE_SWITCH_ON;
+ } else if (STRPREFIX(param, "aes-key-wrap=")) {
+ if (STREQ(arg, "-M")) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("aes-key-wrap is not supported with "
+ "this QEMU binary"));
+ goto error;
+ }
+ param += strlen("aes-key-wrap=");
+ def->keywrap.aes = virTristateSwitchTypeFromString(param);
+ if (def->keywrap.aes < 0)
+ def->keywrap.aes = VIR_TRISTATE_SWITCH_ABSENT;
+ } else if (STRPREFIX(param, "dea-key-wrap=")) {
+ if (STREQ(arg, "-M")) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("dea-key-wrap is not supported with "
+ "this QEMU binary"));
+ goto error;
+ }
+ param += strlen("dea-key-wrap=");
+ def->keywrap.dea = virTristateSwitchTypeFromString(param);
+ if (def->keywrap.dea < 0)
+ def->keywrap.dea = VIR_TRISTATE_SWITCH_ABSENT;
}
}
virStringFreeList(list);
diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 2478ad7..7d2f977 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -899,11 +899,41 @@ virDomainXMLNamespace virQEMUDriverDomainXMLNamespace = {
};
+static bool
+qemuDomainKeyWrapCapsGet(virQEMUDriverPtr driver, virDomainDefPtr def,
+ virQEMUCapsFlags flag)
+{
+ virQEMUCapsPtr qemuCaps = NULL;
+
+ if (driver->qemuCapsCache && def->emulator)
+ qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache, def->emulator);
+
+ return virQEMUCapsGet(qemuCaps, flag);
+}
+
+static int
+qemuDomainKeyWrapSetDefaults(virQEMUDriverPtr driver, virDomainDefPtr def)
+{
+ if (def->keywrap.aes == VIR_TRISTATE_SWITCH_ABSENT) {
+ if (qemuDomainKeyWrapCapsGet(driver, def, QEMU_CAPS_AES_KEY_WRAP))
+ def->keywrap.aes = VIR_DOMAIN_AES_KEY_WRAP_DEFAULT;
+ }
+
+ if (def->keywrap.dea == VIR_TRISTATE_SWITCH_ABSENT) {
+ if (qemuDomainKeyWrapCapsGet(driver, def, QEMU_CAPS_DEA_KEY_WRAP))
+ def->keywrap.dea = VIR_DOMAIN_DEA_KEY_WRAP_DEFAULT;
+ }
+
+ return 0;
+}
+
+
static int
qemuDomainDefPostParse(virDomainDefPtr def,
virCapsPtr caps,
- void *opaque ATTRIBUTE_UNUSED)
+ void *opaque)
{
+ virQEMUDriverPtr driver = opaque;
bool addDefaultUSB = true;
bool addImplicitSATA = false;
bool addPCIRoot = false;
@@ -911,6 +941,7 @@ qemuDomainDefPostParse(virDomainDefPtr def,
bool addDefaultMemballoon = true;
bool addDefaultUSBKBD = false;
bool addDefaultUSBMouse = false;
+ bool setDefaultKeyWrap = false;
if (def->os.bootloader || def->os.bootloaderArgs) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
@@ -974,9 +1005,11 @@ qemuDomainDefPostParse(virDomainDefPtr def,
break;
case VIR_ARCH_S390:
addDefaultUSB = false;
+ setDefaultKeyWrap = true;
break;
case VIR_ARCH_S390X:
addDefaultUSB = false;
+ setDefaultKeyWrap = true;
break;
case VIR_ARCH_SPARC:
@@ -1045,6 +1078,10 @@ qemuDomainDefPostParse(virDomainDefPtr def,
VIR_DOMAIN_INPUT_BUS_USB) < 0)
return -1;
+ if (setDefaultKeyWrap)
+ if (qemuDomainKeyWrapSetDefaults(driver, def) < 0)
+ return -1;
+
return 0;
}
--
1.7.1
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