[PATCH v3 8/9] tools/libxc: add support of injecting MC# to specified CPUs

[Haozhong Zhang <haozhong.zhang@intel.com>]

Though XEN_MC_inject_v2 allows injecting MC# to specified CPUs, the
current xc_mca_op() does not use this feature and not provide an
interface to callers. This commit add a new xc_mca_op_inject_v2() that
receives a cpumap providing the set of target CPUs.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>

Changes in v3:
 * Use goto error handling style.
---
 tools/libxc/include/xenctrl.h |  2 ++
 tools/libxc/xc_misc.c         | 52 ++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/tools/libxc/include/xenctrl.h b/tools/libxc/include/xenctrl.h
index 2d97d36..2399956 100644
--- a/tools/libxc/include/xenctrl.h
+++ b/tools/libxc/include/xenctrl.h
@@ -1796,6 +1796,8 @@ int xc_cpuid_apply_policy(xc_interface *xch,
 void xc_cpuid_to_str(const unsigned int *regs,
                      char **strs); /* some strs[] may be NULL if ENOMEM */
 int xc_mca_op(xc_interface *xch, struct xen_mc *mc);
+int xc_mca_op_inject_v2(xc_interface *xch, unsigned int flags,
+                        xc_cpumap_t cpumap, unsigned int nr_cpus);
 #endif
 
 struct xc_px_val {
diff --git a/tools/libxc/xc_misc.c b/tools/libxc/xc_misc.c
index 88084fd..2303293 100644
--- a/tools/libxc/xc_misc.c
+++ b/tools/libxc/xc_misc.c
@@ -341,7 +341,57 @@ int xc_mca_op(xc_interface *xch, struct xen_mc *mc)
     xc_hypercall_bounce_post(xch, mc);
     return ret;
 }
-#endif
+
+int xc_mca_op_inject_v2(xc_interface *xch, unsigned int flags,
+                        xc_cpumap_t cpumap, unsigned int nr_bits)
+{
+    int ret = -1;
+    struct xen_mc mc_buf, *mc = &mc_buf;
+    struct xen_mc_inject_v2 *inject = &mc->u.mc_inject_v2;
+
+    DECLARE_HYPERCALL_BOUNCE(cpumap, 0, XC_HYPERCALL_BUFFER_BOUNCE_IN);
+    DECLARE_HYPERCALL_BOUNCE(mc, sizeof(*mc), XC_HYPERCALL_BUFFER_BOUNCE_BOTH);
+
+    memset(mc, 0, sizeof(*mc));
+
+    if ( cpumap )
+    {
+        if ( !nr_bits )
+        {
+            errno = EINVAL;
+            goto out;
+        }
+
+        HYPERCALL_BOUNCE_SET_SIZE(cpumap, (nr_bits + 7) / 8);
+        if ( xc_hypercall_bounce_pre(xch, cpumap) )
+        {
+            PERROR("Could not bounce cpumap memory buffer");
+            goto out;
+        }
+        set_xen_guest_handle(inject->cpumap.bitmap, cpumap);
+        inject->cpumap.nr_bits = nr_bits;
+    }
+
+    inject->flags = flags;
+    mc->cmd = XEN_MC_inject_v2;
+    mc->interface_version = XEN_MCA_INTERFACE_VERSION;
+
+    if ( xc_hypercall_bounce_pre(xch, mc) )
+    {
+        PERROR("Could not bounce xen_mc memory buffer");
+        goto out_free_cpumap;
+    }
+
+    ret = xencall1(xch->xcall, __HYPERVISOR_mca, HYPERCALL_BUFFER_AS_ARG(mc));
+
+    xc_hypercall_bounce_post(xch, mc);
+out_free_cpumap:
+    if ( cpumap )
+        xc_hypercall_bounce_post(xch, cpumap);
+out:
+    return ret;
+}
+#endif /* __i386__ || __x86_64__ */
 
 int xc_perfc_reset(xc_interface *xch)
 {
-- 
2.10.1


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