Re: [libvirt] [PATCH 3/4] libvirt: qemu: enable/disable protected key management ops

From: Tony Krowiak <aekrowia(a)us.ibm.com&gt; 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(a)linux.vnet.ibm.com&gt; Signed-off-by: Daniel Hansel <daniel.hansel(a)linux.vnet.ibm.com&gt; Signed-off-by: Boris Fiuczynski <fiuczy(a)linux.vnet.ibm.com&gt; Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.vnet.ibm.com&gt; --- 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; +} + +