[libvirt] [PATCH 1/2] libxl: add support for PVH
Jim Fehlig
jfehlig at suse.com
Fri Sep 16 22:39:23 UTC 2016
On 08/05/2016 12:05 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 <marmarek at invisiblethingslab.com>
> ---
> src/libxl/libxl_capabilities.c | 40 +++++++++++++++++++++++++++++++---------
> src/libxl/libxl_conf.c | 2 ++
> src/libxl/libxl_driver.c | 6 ++++--
> 3 files changed, 37 insertions(+), 11 deletions(-)
I didn't investigate, but this patch did not apply cleanly.
Does 'xenpvh' need to be added to docs/schema/domaincommon.rng? The schema looks
dated anyhow since it currently contains 'xenpv' and 'xenner'. And perhaps this
value should be added to docs/formatdomain.html.in, along with a sentence about
the possible values for Xen machines.
>
> diff --git a/src/libxl/libxl_capabilities.c b/src/libxl/libxl_capabilities.c
> index 0145116..c443353 100644
> --- a/src/libxl/libxl_capabilities.c
> +++ b/src/libxl/libxl_capabilities.c
> @@ -45,11 +45,16 @@ VIR_LOG_INIT("libxl.libxl_capabilities");
> /* see xen-unstable.hg/xen/include/asm-x86/cpufeature.h */
> #define LIBXL_X86_FEATURE_PAE_MASK 0x40
>
> +enum machine_type {
> + machine_hvm,
> + machine_pvh,
> + machine_pv,
> +};
>
> struct guest_arch {
> virArch arch;
> int bits;
> - int hvm;
> + enum machine_type machine;
> int pae;
> int nonpae;
> int ia64_be;
> @@ -296,7 +301,7 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
> /* Search for existing matching (model,hvm) tuple */
> for (i = 0; i < nr_guest_archs; i++) {
> if ((guest_archs[i].arch == arch) &&
> - guest_archs[i].hvm == hvm)
> + guest_archs[i].machine == (hvm ? machine_hvm : machine_pv))
> break;
> }
>
> @@ -308,7 +313,7 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
> nr_guest_archs++;
>
> guest_archs[i].arch = arch;
> - guest_archs[i].hvm = hvm;
> + guest_archs[i].machine = hvm ? machine_hvm : machine_pv;
>
> /* Careful not to overwrite a previous positive
> setting with a negative one here - some archs
> @@ -320,23 +325,40 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
> guest_archs[i].nonpae = nonpae;
> if (ia64_be)
> guest_archs[i].ia64_be = ia64_be;
> +
> + /* On Xen >= 4.4 add PVH for each HVM guest, and do it only once */
> + if ((ver_info->xen_version_major > 4 ||
> + (ver_info->xen_version_major == 4 &&
> + ver_info->xen_version_minor >= 4)) &&
> + hvm && i == nr_guest_archs-1) {
> + i = nr_guest_archs;
> + /* Too many arch flavours - highly unlikely ! */
> + if (i >= ARRAY_CARDINALITY(guest_archs))
> + continue;
> + nr_guest_archs++;
> + guest_archs[i].arch = arch;
> + guest_archs[i].machine = machine_pvh;
> + }
> }
> }
> 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].machine == machine_hvm ? "xenfv" :
> + (guest_archs[i].machine == machine_pvh ? "xenpvh" : "xenpv")};
> virCapsGuestMachinePtr *machines;
>
> if ((machines = virCapabilitiesAllocMachines(xen_machines, 1)) == NULL)
> return -1;
>
> if ((guest = virCapabilitiesAddGuest(caps,
> - guest_archs[i].hvm ? VIR_DOMAIN_OSTYPE_HVM : VIR_DOMAIN_OSTYPE_XEN,
> + guest_archs[i].machine == machine_hvm ?
> + VIR_DOMAIN_OSTYPE_HVM : VIR_DOMAIN_OSTYPE_XEN,
Is a new VIR_DOMAIN_OSTYPE_XENPVH needed?
> guest_archs[i].arch,
> LIBXL_EXECBIN_DIR "/qemu-system-i386",
> - (guest_archs[i].hvm ?
> + (guest_archs[i].machine == machine_hvm ?
> LIBXL_FIRMWARE_DIR "/hvmloader" :
> NULL),
> 1,
> @@ -375,7 +397,7 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
> 0) == NULL)
> return -1;
>
> - if (guest_archs[i].hvm) {
> + if (guest_archs[i].machine != machine_pv) {
> if (virCapabilitiesAddGuestFeature(guest,
> "acpi",
> 1,
> @@ -390,7 +412,7 @@ libxlCapsInitGuests(libxl_ctx *ctx, virCapsPtr caps)
> if (virCapabilitiesAddGuestFeature(guest,
> "hap",
> 1,
> - 1) == NULL)
> + guest_archs[i].machine == machine_hvm) == NULL)
> return -1;
> }
> }
> @@ -409,7 +431,7 @@ libxlMakeDomainOSCaps(const char *machine,
>
> os->supported = true;
>
> - if (STREQ(machine, "xenpv"))
> + if (STREQ(machine, "xenpv") || STREQ(machine, "xenpvh"))
> return 0;
>
> capsLoader->supported = true;
> diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
> index 5202ca1..aa06586 100644
> --- a/src/libxl/libxl_conf.c
> +++ b/src/libxl/libxl_conf.c
> @@ -173,6 +173,8 @@ libxlMakeDomCreateInfo(libxl_ctx *ctx,
> }
> } else {
> c_info->type = LIBXL_DOMAIN_TYPE_PV;
> + if (STREQ(def->os.machine, "xenpvh"))
> + libxl_defbool_set(&c_info->pvh, true);
I assume this won't change with HVMlite, aka pvh2?
> }
>
> if (VIR_STRDUP(c_info->name, def->name) < 0)
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 4957072..fa58346 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -6321,9 +6321,11 @@ 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 {
WRT domain capabilities, should pvh be treated like pv? I.e. do they both have
the same max vcpus, etc?
Also, supporting a new knob in the XML usually means supporting conversion of
that knob to xl.cfg. Can you add domXML <-> xl.cfg conversion for pvh? And a
test case for the conversion too please?
Thanks for your patience.
Regards,
Jim
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