On 9/30/18 8:15 PM, Marek Marczykowski-Górecki wrote:
Since this is something between PV and HVM, it makes sense to put the
setting in place where domain type is specified.
To enable it, use <os><type machine="xenpvh">...</type></os>. It is
also included in capabilities.xml, for every supported HVM guest type - it
doesn't seems to be any other requirement (besides new enough Xen).
Signed-off-by: Marek Marczykowski-Górecki <marma...@invisiblethingslab.com>
---
Changes in v2 proposed by Jim:
- use new_arch_added var instead of i == nr_guest_archs for clarity
- improve comment
- adjust for now required Xen >= 4.6 (remove part for Xen < 4.5)
Changes in v3:
- limit VIR_DOMAIN_OSTYPE_XEN -> VIR_DOMAIN_OSTYPE_LINUX conversion to
Xen PV only
- do not accept VIR_DOMAIN_OSTYPE_LINUX for PVH
- fix reported capabilities for PVH - remove hostdev passthrough and
video/graphics
No video, graphics or hostdev passthrough - bummer. Begs the question: what to
do with PVH XML config containing these devices? Reject it? Silently ignore?
I'll also need to remember to enable these as PVH gains support for the devices.
- use #ifdef LIBXL_DOMAIN_TYPE_PVH instead of hypervisor version to
check for PVH support
This is a much better approach than the version check. I should have thought of
that earlier, sorry.
- compile fix for Xen < 4.9
---
docs/formatcaps.html.in | 4 +--
docs/schemas/domaincommon.rng | 1 +-
src/conf/domain_conf.c | 6 ++--
src/libxl/libxl_capabilities.c | 47 ++++++++++++++++++++++++++++-----
src/libxl/libxl_conf.c | 50 ++++++++++++++++++++++++++++++-----
src/libxl/libxl_driver.c | 6 ++--
6 files changed, 95 insertions(+), 19 deletions(-)
diff --git a/docs/formatcaps.html.in b/docs/formatcaps.html.in
index 0d9c53d..b8102fd 100644
--- a/docs/formatcaps.html.in
+++ b/docs/formatcaps.html.in
@@ -104,8 +104,8 @@
<dt><code>machine</code></dt><dd>Machine type, for use in
<a href="formatdomain.html#attributeOSTypeMachine">machine</a>
attribute of os/type element in domain XML. For example Xen
- supports <code>xenfv</code> for HVM or <code>xenpv</code> for
- PV.</dd>
+ supports <code>xenfv</code> for HVM, <code>xenpv</code> for
+ PV, or <code>xenpvh</code> for PVHv2.</dd>
s/PVHv2/PVH/
<dt><code>domain</code></dt><dd>The <code>type</code> attribute of
this element specifies the type of hypervisor required to run
the
domain. Use in <a
href="formatdomain.html#attributeDomainType">type</a>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 099a949..820a7c6 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -341,6 +341,7 @@
<choice>
<value>xenpv</value>
<value>xenfv</value>
+ <value>xenpvh</value>
</choice>
</attribute>
</optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9911d56..a945ad4 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -19094,7 +19094,8 @@ virDomainDefParseCaps(virDomainDefPtr def,
* be 'xen'. So we accept the former and convert
*/
if (def->os.type == VIR_DOMAIN_OSTYPE_LINUX &&
- def->virtType == VIR_DOMAIN_VIRT_XEN) {
+ def->virtType == VIR_DOMAIN_VIRT_XEN &&
+ (!def->os.machine || STREQ(def->os.machine, "xenpv"))) {
def->os.type = VIR_DOMAIN_OSTYPE_XEN;
}
@@ -27705,7 +27706,8 @@ virDomainDefFormatInternal(virDomainDefPtr def,
* be 'xen'. So we convert to the former for backcompat
*/
if (def->virtType == VIR_DOMAIN_VIRT_XEN &&
- def->os.type == VIR_DOMAIN_OSTYPE_XEN)
+ def->os.type == VIR_DOMAIN_OSTYPE_XEN &&
+ (!def->os.machine || STREQ(def->os.machine, "xenpv")))
virBufferAsprintf(buf, ">%s</type>\n",
virDomainOSTypeToString(VIR_DOMAIN_OSTYPE_LINUX));
else
diff --git a/src/libxl/libxl_capabilities.c b/src/libxl/libxl_capabilities.c
index 18596c7..be51a4d 100644
--- a/src/libxl/libxl_capabilities.c
+++ b/src/libxl/libxl_capabilities.c
@@ -57,6 +57,7 @@ struct guest_arch {
virArch arch;
int bits;
int hvm;
+ int pvh;
int pae;
int nonpae;
int ia64_be;
@@ -439,6 +440,9 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
int hvm = STRPREFIX(&token[subs[1].rm_so], "hvm");
virArch arch;
int pae = 0, nonpae = 0, ia64_be = 0;
+#ifdef LIBXL_DOMAIN_TYPE_PVH
+ bool new_arch_added = false;
+#endif
if (STRPREFIX(&token[subs[2].rm_so], "x86_32")) {
arch = VIR_ARCH_I686;
@@ -475,8 +479,12 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
if (i >= ARRAY_CARDINALITY(guest_archs))
continue;
/* Didn't find a match, so create a new one */
- if (i == nr_guest_archs)
+ if (i == nr_guest_archs) {
nr_guest_archs++;
+#ifdef LIBXL_DOMAIN_TYPE_PVH
+ new_arch_added = true;
+#endif
+ }
My idea to add this variable for clarity now seems diluted by the need for the
extra ifdef's :-/. Your original approach would avoid them.
The rest of the patch looks good, but before going further let's get a
resolution to the VIR_DOMAIN_OSTYPE_XENPVH vs os.machine approach to modeling
PVH. I can do some poking on IRC if there are no responses to this thread.
Regards,
Jim
guest_archs[i].arch = arch;
guest_archs[i].hvm = hvm;
@@ -491,13 +499,33 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
guest_archs[i].nonpae = nonpae;
if (ia64_be)
guest_archs[i].ia64_be = ia64_be;
+
+ /*
+ * Xen 4.9 introduced support for the PVH guest type, which
+ * requires hardware virtualization support similar to the
+ * HVM guest type. Add a PVH guest type for each new HVM
+ * guest type.
+ */
+#ifdef LIBXL_DOMAIN_TYPE_PVH
+ if (hvm && new_arch_added) {
+ i = nr_guest_archs;
+ /* Ensure we have not exhausted the guest_archs array */
+ if (nr_guest_archs >= ARRAY_CARDINALITY(guest_archs))
+ continue;
+ guest_archs[nr_guest_archs].arch = arch;
+ guest_archs[nr_guest_archs].pvh = 1;
+ nr_guest_archs++;
+ }
+#endif
}
}
regfree(®ex);
for (i = 0; i < nr_guest_archs; ++i) {
virCapsGuestPtr guest;
- char const *const xen_machines[] = {guest_archs[i].hvm ? "xenfv" :
"xenpv"};
+ char const *const xen_machines[] = {
+ guest_archs[i].hvm ? "xenfv" :
+ (guest_archs[i].pvh ? "xenpvh" : "xenpv")};
virCapsGuestMachinePtr *machines;
if ((machines = virCapabilitiesAllocMachines(xen_machines, 1)) == NULL)
@@ -557,7 +585,9 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
1,
0) == NULL)
return -1;
+ }
+ if (guest_archs[i].hvm || guest_archs[i].pvh) {
if (virCapabilitiesAddGuestFeature(guest,
"hap",
1,
@@ -580,7 +610,7 @@ libxlMakeDomainOSCaps(const char *machine,
os->supported = true;
- if (STREQ(machine, "xenpv"))
+ if (STREQ(machine, "xenpv") || STREQ(machine, "xenpvh"))
return 0;
capsLoader->supported = true;
@@ -732,11 +762,14 @@ libxlMakeDomainCapabilities(virDomainCapsPtr domCaps,
domCaps->maxvcpus = PV_MAX_VCPUS;
if (libxlMakeDomainOSCaps(domCaps->machine, os, firmwares, nfirmwares) < 0 ||
- libxlMakeDomainDeviceDiskCaps(disk) < 0 ||
- libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
- libxlMakeDomainDeviceVideoCaps(video) < 0 ||
- libxlMakeDomainDeviceHostdevCaps(hostdev) < 0)
+ libxlMakeDomainDeviceDiskCaps(disk) < 0)
return -1;
+ if (STRNEQ(domCaps->machine, "xenpvh") &&
+ (libxlMakeDomainDeviceGraphicsCaps(graphics) < 0 ||
+ libxlMakeDomainDeviceVideoCaps(video) < 0 ||
+ libxlMakeDomainDeviceHostdevCaps(hostdev) < 0))
+ return -1;
+
return 0;
}
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index f3da0ed..0007906 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -133,8 +133,20 @@ libxlMakeDomCreateInfo(libxl_ctx *ctx,
libxl_domain_create_info_init(c_info);
- if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
+ if (def->os.type == VIR_DOMAIN_OSTYPE_HVM ||
+ (def->os.type == VIR_DOMAIN_OSTYPE_XEN &&
+ STREQ(def->os.machine, "xenpvh"))) {
+#ifdef LIBXL_DOMAIN_TYPE_PVH
+ c_info->type = def->os.type == VIR_DOMAIN_OSTYPE_HVM ?
+ LIBXL_DOMAIN_TYPE_HVM : LIBXL_DOMAIN_TYPE_PVH;
+#else
+ if (STREQ(def->os.machine, "xenpvh")) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("PVH guest type not supported"));
+ return -1;
+ }
c_info->type = LIBXL_DOMAIN_TYPE_HVM;
+#endif
switch ((virTristateSwitch) def->features[VIR_DOMAIN_FEATURE_HAP]) {
case VIR_TRISTATE_SWITCH_OFF:
libxl_defbool_set(&c_info->hap, false);
@@ -276,16 +288,26 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
virDomainClockDef clock = def->clock;
libxl_ctx *ctx = cfg->ctx;
libxl_domain_build_info *b_info = &d_config->b_info;
- int hvm = def->os.type == VIR_DOMAIN_OSTYPE_HVM;
+ bool hvm = def->os.type == VIR_DOMAIN_OSTYPE_HVM;
+ bool pvh = STREQ(def->os.machine, "xenpvh");
size_t i;
size_t nusbdevice = 0;
libxl_domain_build_info_init(b_info);
- if (hvm)
+ if (hvm) {
libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_HVM);
- else
+ } else if (pvh) {
+#ifdef LIBXL_DOMAIN_TYPE_PVH
+ libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PVH);
+#else
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+ _("PVH guest type not supported"));
+ return -1;
+#endif
+ } else {
libxl_domain_build_info_init_type(b_info, LIBXL_DOMAIN_TYPE_PV);
+ }
b_info->max_vcpus = virDomainDefGetVcpusMax(def);
if (libxl_cpu_bitmap_alloc(ctx, &b_info->avail_vcpus, b_info->max_vcpus))
@@ -375,7 +397,7 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
def->mem.cur_balloon = VIR_ROUND_UP(def->mem.cur_balloon, 1024);
b_info->max_memkb = virDomainDefGetMemoryInitial(def);
b_info->target_memkb = def->mem.cur_balloon;
- if (hvm) {
+ if (hvm || pvh) {
if (caps &&
def->cpu && def->cpu->mode == (VIR_CPU_MODE_HOST_PASSTHROUGH)) {
bool hasHwVirt = false;
@@ -647,6 +669,22 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
return -1;
}
#endif
+ } else if (pvh) {
+ if (VIR_STRDUP(b_info->cmdline, def->os.cmdline) < 0)
+ return -1;
+ if (VIR_STRDUP(b_info->kernel, def->os.kernel) < 0)
+ return -1;
+ if (VIR_STRDUP(b_info->ramdisk, def->os.initrd) < 0)
+ return -1;
+#ifdef LIBXL_HAVE_BUILDINFO_BOOTLOADER
+ if (VIR_STRDUP(b_info->bootloader, def->os.bootloader) < 0)
+ return -1;
+ if (def->os.bootloaderArgs) {
+ if (!(b_info->bootloader_args =
+ virStringSplit(def->os.bootloaderArgs, " \t\n", 0)))
+ return -1;
+ }
+#endif
} else {
/*
* For compatibility with the legacy xen toolstack, default to pygrub
@@ -1230,7 +1268,7 @@ libxlMakeNic(virDomainDefPtr def,
STRNEQ(l_nic->model, "netfront")) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("only model 'netfront' is supported for "
- "Xen PV domains"));
+ "Xen PV(H) domains"));
return -1;
}
if (VIR_STRDUP(x_nic->model, l_nic->model) < 0)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index efd47a3..6287cef 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -6398,9 +6398,11 @@ libxlConnectGetDomainCapabilities(virConnectPtr conn,
emulatorbin = "/usr/bin/qemu-system-x86_64";
if (machine) {
- if (STRNEQ(machine, "xenpv") && STRNEQ(machine, "xenfv")) {
+ if (STRNEQ(machine, "xenpv") &&
+ STRNEQ(machine, "xenpvh") &&
+ STRNEQ(machine, "xenfv")) {
virReportError(VIR_ERR_INVALID_ARG, "%s",
- _("Xen only supports 'xenpv' and 'xenfv'
machines"));
+ _("Xen only supports 'xenpv', 'xenpvh' and 'xenfv'
machines"));
goto cleanup;
}
} else {
--
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