[PATCH v4 04/11] xen: extend domctl interface for cache coloring

[Carlo Nonato <carlo.nonato@minervasys.tech>]

This commit updates the domctl interface to allow the user to set cache
coloring configurations from the toolstack.
It also implements the functionality for arm64.

Based on original work from: Luca Miccio <lucmiccio@gmail.com>

Signed-off-by: Carlo Nonato <carlo.nonato@minervasys.tech>
Signed-off-by: Marco Solieri <marco.solieri@minervasys.tech>
---
v4:
- updated XEN_DOMCTL_INTERFACE_VERSION
---
 xen/arch/arm/llc_coloring.c    | 14 ++++++++++++++
 xen/common/domctl.c            | 12 +++++++++++-
 xen/include/public/domctl.h    |  6 +++++-
 xen/include/xen/llc_coloring.h |  4 ++++
 4 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/llc_coloring.c b/xen/arch/arm/llc_coloring.c
index 51f057d7c9..2d0457cdbc 100644
--- a/xen/arch/arm/llc_coloring.c
+++ b/xen/arch/arm/llc_coloring.c
@@ -10,6 +10,7 @@
  */
 #include <xen/bitops.h>
 #include <xen/errno.h>
+#include <xen/guest_access.h>
 #include <xen/keyhandler.h>
 #include <xen/llc_coloring.h>
 #include <xen/param.h>
@@ -275,6 +276,19 @@ unsigned int *dom0_llc_colors(unsigned int *num_colors)
     return colors;
 }
 
+unsigned int *llc_colors_from_guest(struct xen_domctl_createdomain *config)
+{
+    unsigned int *colors;
+
+    if ( !config->num_llc_colors )
+        return NULL;
+
+    colors = alloc_colors(config->num_llc_colors);
+    copy_from_guest(colors, config->llc_colors, config->num_llc_colors);
+
+    return colors;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/xen/common/domctl.c b/xen/common/domctl.c
index ad71ad8a4c..505626ec46 100644
--- a/xen/common/domctl.c
+++ b/xen/common/domctl.c
@@ -8,6 +8,7 @@
 
 #include <xen/types.h>
 #include <xen/lib.h>
+#include <xen/llc_coloring.h>
 #include <xen/err.h>
 #include <xen/mm.h>
 #include <xen/sched.h>
@@ -409,6 +410,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
     {
         domid_t        dom;
         static domid_t rover = 0;
+        unsigned int *llc_colors = NULL, num_llc_colors = 0;
 
         dom = op->domain;
         if ( (dom > 0) && (dom < DOMID_FIRST_RESERVED) )
@@ -434,7 +436,15 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl)
             rover = dom;
         }
 
-        d = domain_create(dom, &op->u.createdomain, false);
+        if ( llc_coloring_enabled )
+        {
+            llc_colors = llc_colors_from_guest(&op->u.createdomain);
+            num_llc_colors = op->u.createdomain.num_llc_colors;
+        }
+
+        d = domain_create_llc_colored(dom, &op->u.createdomain, false,
+                                      llc_colors, num_llc_colors);
+
         if ( IS_ERR(d) )
         {
             ret = PTR_ERR(d);
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 51be28c3de..49cccc8503 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -21,7 +21,7 @@
 #include "hvm/save.h"
 #include "memory.h"
 
-#define XEN_DOMCTL_INTERFACE_VERSION 0x00000015
+#define XEN_DOMCTL_INTERFACE_VERSION 0x00000016
 
 /*
  * NB. xen_domctl.domain is an IN/OUT parameter for this operation.
@@ -92,6 +92,10 @@ struct xen_domctl_createdomain {
     /* CPU pool to use; specify 0 or a specific existing pool */
     uint32_t cpupool_id;
 
+    /* IN LLC coloring parameters */
+    uint32_t num_llc_colors;
+    XEN_GUEST_HANDLE(uint32) llc_colors;
+
     struct xen_arch_domainconfig arch;
 };
 
diff --git a/xen/include/xen/llc_coloring.h b/xen/include/xen/llc_coloring.h
index 625930d378..2855f38296 100644
--- a/xen/include/xen/llc_coloring.h
+++ b/xen/include/xen/llc_coloring.h
@@ -24,6 +24,8 @@ int domain_llc_coloring_init(struct domain *d, unsigned int *colors,
 void domain_llc_coloring_free(struct domain *d);
 void domain_dump_llc_colors(struct domain *d);
 
+unsigned int *llc_colors_from_guest(struct xen_domctl_createdomain *config);
+
 #else
 
 #define llc_coloring_enabled (false)
@@ -36,6 +38,8 @@ static inline int domain_llc_coloring_init(struct domain *d,
 }
 static inline void domain_llc_coloring_free(struct domain *d) {}
 static inline void domain_dump_llc_colors(struct domain *d) {}
+static inline unsigned int *llc_colors_from_guest(
+    struct xen_domctl_createdomain *config) { return NULL; }
 
 #endif /* CONFIG_HAS_LLC_COLORING */
 
-- 
2.34.1