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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [v7 PATCH 06/10] libxc: get and set soft and hard affinity
by using the flag and the new cpumap arguments introduced in
the parameters of the DOMCTL_{get,set}_vcpuaffinity hypercalls.
Now, both xc_vcpu_setaffinity() and xc_vcpu_getaffinity() have
a new flag parameter, to specify whether the user wants to
set/get hard affinity, soft affinity or both. They also have
two cpumap parameters instead of only one. This way, it is
possible to set/get both hard and soft affinity at the same
time (and, in case of set, each one to its own value).
In xc_vcpu_setaffinity(), the cpumaps are IN/OUT parameters,
as it is for the corresponding arguments of the
DOMCTL_set_vcpuaffinity hypercall. What Xen puts there is the
hard and soft effective affinity, that is what Xen will actually
use for scheduling.
In-tree callers are also fixed to cope with the new interface.
Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Acked-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
Changes from v4:
* update toward the new hypercall interface;
* migrate to hypercall BOUNCEs instead of BUFFERs, as
suggested during (v3) review;
Changes from v2:
* better cleanup logic in _vcpu_setaffinity() (regarding
xc_hypercall_buffer_{alloc,free}()), as suggested during
review;
* make it more evident that DOMCTL_setvcpuaffinity has an out
parameter, by calling ecpumap_out, and improving the comment
wrt that;
* change the interface and have xc_vcpu_[sg]etaffinity() so
that they take the new parameters (flags and ecpumap_out) and
fix the in tree callers.
---
tools/libxc/xc_domain.c | 68 +++++++++++++++++++++++------------
tools/libxc/xenctrl.h | 55 +++++++++++++++++++++++++++-
tools/libxl/libxl.c | 6 ++-
tools/ocaml/libs/xc/xenctrl_stubs.c | 8 +++-
tools/python/xen/lowlevel/xc/xc.c | 6 ++-
5 files changed, 111 insertions(+), 32 deletions(-)
diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 861b471..20ed127 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -202,10 +202,15 @@ int xc_domain_node_getaffinity(xc_interface *xch,
int xc_vcpu_setaffinity(xc_interface *xch,
uint32_t domid,
int vcpu,
- xc_cpumap_t cpumap)
+ xc_cpumap_t cpumap_hard_inout,
+ xc_cpumap_t cpumap_soft_inout,
+ uint32_t flags)
{
DECLARE_DOMCTL;
- DECLARE_HYPERCALL_BUFFER(uint8_t, local);
+ DECLARE_HYPERCALL_BOUNCE(cpumap_hard_inout, 0,
+ XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+ DECLARE_HYPERCALL_BOUNCE(cpumap_soft_inout, 0,
+ XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
int ret = -1;
int cpusize;
@@ -213,32 +218,37 @@ int xc_vcpu_setaffinity(xc_interface *xch,
if (cpusize <= 0)
{
PERROR("Could not get number of cpus");
- goto out;
+ return -1;
}
- local = xc_hypercall_buffer_alloc(xch, local, cpusize);
- if ( local == NULL )
+ HYPERCALL_BOUNCE_SET_SIZE(cpumap_hard_inout, cpusize);
+ HYPERCALL_BOUNCE_SET_SIZE(cpumap_soft_inout, cpusize);
+
+ if ( xc_hypercall_bounce_pre(xch, cpumap_hard_inout) ||
+ xc_hypercall_bounce_pre(xch, cpumap_soft_inout) )
{
- PERROR("Could not allocate memory for setvcpuaffinity domctl
hypercall");
+ PERROR("Could not allocate hcall buffers for DOMCTL_setvcpuaffinity");
goto out;
}
domctl.cmd = XEN_DOMCTL_setvcpuaffinity;
domctl.domain = (domid_t)domid;
domctl.u.vcpuaffinity.vcpu = vcpu;
- domctl.u.vcpuaffinity.flags = XEN_VCPUAFFINITY_HARD;
-
- memcpy(local, cpumap, cpusize);
-
- set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_hard.bitmap, local);
+ domctl.u.vcpuaffinity.flags = flags;
+ set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_hard.bitmap,
+ cpumap_hard_inout);
domctl.u.vcpuaffinity.cpumap_hard.nr_bits = cpusize * 8;
+ set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_soft.bitmap,
+ cpumap_soft_inout);
+ domctl.u.vcpuaffinity.cpumap_soft.nr_bits = cpusize * 8;
ret = do_domctl(xch, &domctl);
- xc_hypercall_buffer_free(xch, local);
-
out:
+ xc_hypercall_bounce_post(xch, cpumap_hard_inout);
+ xc_hypercall_bounce_post(xch, cpumap_soft_inout);
+
return ret;
}
@@ -246,10 +256,13 @@ int xc_vcpu_setaffinity(xc_interface *xch,
int xc_vcpu_getaffinity(xc_interface *xch,
uint32_t domid,
int vcpu,
- xc_cpumap_t cpumap)
+ xc_cpumap_t cpumap_hard,
+ xc_cpumap_t cpumap_soft,
+ uint32_t flags)
{
DECLARE_DOMCTL;
- DECLARE_HYPERCALL_BUFFER(uint8_t, local);
+ DECLARE_HYPERCALL_BOUNCE(cpumap_hard, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
+ DECLARE_HYPERCALL_BOUNCE(cpumap_soft, 0, XC_HYPERCALL_BUFFER_BOUNCE_OUT);
int ret = -1;
int cpusize;
@@ -257,30 +270,37 @@ int xc_vcpu_getaffinity(xc_interface *xch,
if (cpusize <= 0)
{
PERROR("Could not get number of cpus");
- goto out;
+ return -1;
}
- local = xc_hypercall_buffer_alloc(xch, local, cpusize);
- if (local == NULL)
+ HYPERCALL_BOUNCE_SET_SIZE(cpumap_hard, cpusize);
+ HYPERCALL_BOUNCE_SET_SIZE(cpumap_soft, cpusize);
+
+ if ( xc_hypercall_bounce_pre(xch, cpumap_hard) ||
+ xc_hypercall_bounce_pre(xch, cpumap_soft) )
{
- PERROR("Could not allocate memory for getvcpuaffinity domctl
hypercall");
+ PERROR("Could not allocate hcall buffers for DOMCTL_getvcpuaffinity");
goto out;
}
domctl.cmd = XEN_DOMCTL_getvcpuaffinity;
domctl.domain = (domid_t)domid;
domctl.u.vcpuaffinity.vcpu = vcpu;
- domctl.u.vcpuaffinity.flags = XEN_VCPUAFFINITY_HARD;
+ domctl.u.vcpuaffinity.flags = flags;
- set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_hard.bitmap, local);
+ set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_hard.bitmap,
+ cpumap_hard);
domctl.u.vcpuaffinity.cpumap_hard.nr_bits = cpusize * 8;
+ set_xen_guest_handle(domctl.u.vcpuaffinity.cpumap_soft.bitmap,
+ cpumap_soft);
+ domctl.u.vcpuaffinity.cpumap_soft.nr_bits = cpusize * 8;
ret = do_domctl(xch, &domctl);
- memcpy(cpumap, local, cpusize);
+ out:
+ xc_hypercall_bounce_post(xch, cpumap_hard);
+ xc_hypercall_bounce_post(xch, cpumap_soft);
- xc_hypercall_buffer_free(xch, local);
-out:
return ret;
}
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 400f0df..fd2388e 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -582,14 +582,65 @@ int xc_domain_node_getaffinity(xc_interface *xch,
uint32_t domind,
xc_nodemap_t nodemap);
+/**
+ * This function specifies the CPU affinity for a vcpu.
+ *
+ * There are two kinds of affinity. Soft affinity is on what CPUs a vcpu
+ * prefers to run. Hard affinity is on what CPUs a vcpu is allowed to run.
+ * If flags contains XEN_VCPUAFFINITY_SOFT, the soft affinity it is set to
+ * what cpumap_soft_inout contains. If flags contains XEN_VCPUAFFINITY_HARD,
+ * the hard affinity is set to what cpumap_hard_inout contains. Both flags
+ * can be set at the same time, in which case both soft and hard affinity are
+ * set to what the respective parameter contains.
+ *
+ * The function also returns the effective hard or/and soft affinity, still
+ * via the cpumap_soft_inout and cpumap_hard_inout parameters. Effective
+ * affinity is, in case of soft affinity, the intersection of soft affinity,
+ * hard affinity and the cpupool's online CPUs for the domain, and is returned
+ * in cpumap_soft_inout, if XEN_VCPUAFFINITY_SOFT is set in flags. In case of
+ * hard affinity, it is the intersection between hard affinity and the
+ * cpupool's online CPUs, and is returned in cpumap_hard_inout, if
+ * XEN_VCPUAFFINITY_HARD is set in flags. If both flags are set, both soft
+ * and hard affinity are returned in the respective parameter.
+ *
+ * We do report it back as effective affinity is what the Xen scheduler will
+ * actually use, and we thus allow checking whether or not that matches with,
+ * or at least is good enough for, the caller's purposes.
+ *
+ * @param xch a handle to an open hypervisor interface.
+ * @param domid the id of the domain to which the vcpu belongs
+ * @param vcpu the vcpu id wihin the domain
+ * @param cpumap_hard_inout specifies(/returns) the (effective) hard affinity
+ * @param cpumap_soft_inout specifies(/returns) the (effective) soft affinity
+ * @param flags what we want to set
+ */
int xc_vcpu_setaffinity(xc_interface *xch,
uint32_t domid,
int vcpu,
- xc_cpumap_t cpumap);
+ xc_cpumap_t cpumap_hard_inout,
+ xc_cpumap_t cpumap_soft_inout,
+ uint32_t flags);
+
+/**
+ * This function retrieves hard and soft CPU affinity of a vcpu,
+ * depending on what flags are set.
+ *
+ * Soft affinity is returned in cpumap_soft if XEN_VCPUAFFINITY_SOFT is set.
+ * Hard affinity is returned in cpumap_hard if XEN_VCPUAFFINITY_HARD is set.
+ *
+ * @param xch a handle to an open hypervisor interface.
+ * @param domid the id of the domain to which the vcpu belongs
+ * @param vcpu the vcpu id wihin the domain
+ * @param cpumap_hard is where hard affinity is returned
+ * @param cpumap_soft is where soft affinity is returned
+ * @param flags what we want get
+ */
int xc_vcpu_getaffinity(xc_interface *xch,
uint32_t domid,
int vcpu,
- xc_cpumap_t cpumap);
+ xc_cpumap_t cpumap_hard,
+ xc_cpumap_t cpumap_soft,
+ uint32_t flags);
/**
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index 900b8d4..ec79645 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -4582,7 +4582,8 @@ libxl_vcpuinfo *libxl_list_vcpu(libxl_ctx *ctx, uint32_t
domid,
goto err;
}
if (xc_vcpu_getaffinity(ctx->xch, domid, *nr_vcpus_out,
- ptr->cpumap.map) == -1) {
+ ptr->cpumap.map, NULL,
+ XEN_VCPUAFFINITY_HARD) == -1) {
LOGE(ERROR, "getting vcpu affinity");
goto err;
}
@@ -4606,7 +4607,8 @@ err:
int libxl_set_vcpuaffinity(libxl_ctx *ctx, uint32_t domid, uint32_t vcpuid,
libxl_bitmap *cpumap)
{
- if (xc_vcpu_setaffinity(ctx->xch, domid, vcpuid, cpumap->map)) {
+ if (xc_vcpu_setaffinity(ctx->xch, domid, vcpuid, cpumap->map, NULL,
+ XEN_VCPUAFFINITY_HARD)) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "setting vcpu affinity");
return ERROR_FAIL;
}
diff --git a/tools/ocaml/libs/xc/xenctrl_stubs.c
b/tools/ocaml/libs/xc/xenctrl_stubs.c
index ff29b47..f0810eb 100644
--- a/tools/ocaml/libs/xc/xenctrl_stubs.c
+++ b/tools/ocaml/libs/xc/xenctrl_stubs.c
@@ -438,7 +438,9 @@ CAMLprim value stub_xc_vcpu_setaffinity(value xch, value
domid,
c_cpumap[i/8] |= 1 << (i&7);
}
retval = xc_vcpu_setaffinity(_H(xch), _D(domid),
- Int_val(vcpu), c_cpumap);
+ Int_val(vcpu),
+ c_cpumap, NULL,
+ XEN_VCPUAFFINITY_HARD);
free(c_cpumap);
if (retval < 0)
@@ -460,7 +462,9 @@ CAMLprim value stub_xc_vcpu_getaffinity(value xch, value
domid,
failwith_xc(_H(xch));
retval = xc_vcpu_getaffinity(_H(xch), _D(domid),
- Int_val(vcpu), c_cpumap);
+ Int_val(vcpu),
+ c_cpumap, NULL,
+ XEN_VCPUAFFINITY_HARD);
if (retval < 0) {
free(c_cpumap);
failwith_xc(_H(xch));
diff --git a/tools/python/xen/lowlevel/xc/xc.c
b/tools/python/xen/lowlevel/xc/xc.c
index cb34446..54e8799 100644
--- a/tools/python/xen/lowlevel/xc/xc.c
+++ b/tools/python/xen/lowlevel/xc/xc.c
@@ -256,7 +256,8 @@ static PyObject *pyxc_vcpu_setaffinity(XcObject *self,
}
}
- if ( xc_vcpu_setaffinity(self->xc_handle, dom, vcpu, cpumap) != 0 )
+ if ( xc_vcpu_setaffinity(self->xc_handle, dom, vcpu, cpumap,
+ NULL, XEN_VCPUAFFINITY_HARD) != 0 )
{
free(cpumap);
return pyxc_error_to_exception(self->xc_handle);
@@ -403,7 +404,8 @@ static PyObject *pyxc_vcpu_getinfo(XcObject *self,
if(cpumap == NULL)
return pyxc_error_to_exception(self->xc_handle);
- rc = xc_vcpu_getaffinity(self->xc_handle, dom, vcpu, cpumap);
+ rc = xc_vcpu_getaffinity(self->xc_handle, dom, vcpu, cpumap,
+ NULL, XEN_VCPUAFFINITY_HARD);
if ( rc < 0 )
{
free(cpumap);
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