[Xen-devel] [PATCH v8 3/8] xen/arm: introduce kinfo->phandle_gic

[Stefano Stabellini <sstabellini@kernel.org>]

Instead of always hard-coding the GIC phandle (GUEST_PHANDLE_GIC), store
it in a variable under kinfo. This way it can be dynamically chosen per
domain. Remove the fdt pointer argument to the make_*_domU_node
functions and oass a struct kernel_info * instead. The fdt pointer can
be accessed from kinfo->fdt. Remove the struct domain *d parameter to
the make_*_domU_node functions because it becomes unused.

Initialize phandle_gic to GUEST_PHANDLE_GIC at the beginning of
prepare_dtb_domU for DomUs. Later patches will change the value of
phandle_gic depending on user provided information.

For Dom0, initialize phandle_gic to dt_interrupt_controller->phandle
(current value) at the beginning of prepare_dtb.

Signed-off-by: Stefano Stabellini <stefanos@xilinx.com>
Acked-by: Julien Grall <julien.grall@arm.com>

---
Changes in v6:
- rename guest_phandle_gic to phandle_gic
- use phandle_gic for dom0 too

Changes in v5:
- improve commit message

Changes in v4:
- new patch
---
 xen/arch/arm/domain_build.c  | 39 ++++++++++++++++++++----------------
 xen/include/asm-arm/kernel.h |  3 +++
 2 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index fb356603e2..d23c0a9b87 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -626,15 +626,14 @@ static int __init fdt_property_interrupts(const struct kernel_info *kinfo,
                                           unsigned num_irq)
 {
     int res;
-    uint32_t phandle = is_hardware_domain(kinfo->d) ?
-                       dt_interrupt_controller->phandle : GUEST_PHANDLE_GIC;
 
     res = fdt_property(kinfo->fdt, "interrupts",
                        intr, sizeof(intr[0]) * num_irq);
     if ( res )
         return res;
 
-    res = fdt_property_cell(kinfo->fdt, "interrupt-parent", phandle);
+    res = fdt_property_cell(kinfo->fdt, "interrupt-parent",
+                            kinfo->phandle_gic);
 
     return res;
 }
@@ -1552,8 +1551,9 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
     return res;
 }
 
-static int __init make_gicv2_domU_node(const struct domain *d, void *fdt)
+static int __init make_gicv2_domU_node(struct kernel_info *kinfo)
 {
+    void *fdt = kinfo->fdt;
     int res = 0;
     __be32 reg[(GUEST_ROOT_ADDRESS_CELLS + GUEST_ROOT_SIZE_CELLS) * 2];
     __be32 *cells;
@@ -1588,11 +1588,11 @@ static int __init make_gicv2_domU_node(const struct domain *d, void *fdt)
     if (res)
         return res;
 
-    res = fdt_property_cell(fdt, "linux,phandle", GUEST_PHANDLE_GIC);
+    res = fdt_property_cell(fdt, "linux,phandle", kinfo->phandle_gic);
     if (res)
         return res;
 
-    res = fdt_property_cell(fdt, "phandle", GUEST_PHANDLE_GIC);
+    res = fdt_property_cell(fdt, "phandle", kinfo->phandle_gic);
     if (res)
         return res;
 
@@ -1601,8 +1601,9 @@ static int __init make_gicv2_domU_node(const struct domain *d, void *fdt)
     return res;
 }
 
-static int __init make_gicv3_domU_node(const struct domain *d, void *fdt)
+static int __init make_gicv3_domU_node(struct kernel_info *kinfo)
 {
+    void *fdt = kinfo->fdt;
     int res = 0;
     __be32 reg[(GUEST_ROOT_ADDRESS_CELLS + GUEST_ROOT_SIZE_CELLS) * 2];
     __be32 *cells;
@@ -1637,11 +1638,11 @@ static int __init make_gicv3_domU_node(const struct domain *d, void *fdt)
     if (res)
         return res;
 
-    res = fdt_property_cell(fdt, "linux,phandle", GUEST_PHANDLE_GIC);
+    res = fdt_property_cell(fdt, "linux,phandle", kinfo->phandle_gic);
     if (res)
         return res;
 
-    res = fdt_property_cell(fdt, "phandle", GUEST_PHANDLE_GIC);
+    res = fdt_property_cell(fdt, "phandle", kinfo->phandle_gic);
     if (res)
         return res;
 
@@ -1650,22 +1651,23 @@ static int __init make_gicv3_domU_node(const struct domain *d, void *fdt)
     return res;
 }
 
-static int __init make_gic_domU_node(const struct domain *d, void *fdt)
+static int __init make_gic_domU_node(struct kernel_info *kinfo)
 {
-    switch ( d->arch.vgic.version )
+    switch ( kinfo->d->arch.vgic.version )
     {
     case GIC_V3:
-        return make_gicv3_domU_node(d, fdt);
+        return make_gicv3_domU_node(kinfo);
     case GIC_V2:
-        return make_gicv2_domU_node(d, fdt);
+        return make_gicv2_domU_node(kinfo);
     default:
         panic("Unsupported GIC version\n");
     }
 }
 
 #ifdef CONFIG_SBSA_VUART_CONSOLE
-static int __init make_vpl011_uart_node(const struct domain *d, void *fdt)
+static int __init make_vpl011_uart_node(struct kernel_info *kinfo)
 {
+    void *fdt = kinfo->fdt;
     int res;
     gic_interrupt_t intr;
     __be32 reg[GUEST_ROOT_ADDRESS_CELLS + GUEST_ROOT_SIZE_CELLS];
@@ -1696,7 +1698,7 @@ static int __init make_vpl011_uart_node(const struct domain *d, void *fdt)
         return res;
 
     res = fdt_property_cell(fdt, "interrupt-parent",
-                            GUEST_PHANDLE_GIC);
+                            kinfo->phandle_gic);
     if ( res )
         return res;
 
@@ -1721,6 +1723,8 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
     int addrcells, sizecells;
     int ret;
 
+    kinfo->phandle_gic = GUEST_PHANDLE_GIC;
+
     addrcells = GUEST_ROOT_ADDRESS_CELLS;
     sizecells = GUEST_ROOT_SIZE_CELLS;
 
@@ -1764,7 +1768,7 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
     if ( ret )
         goto err;
 
-    ret = make_gic_domU_node(d, kinfo->fdt);
+    ret = make_gic_domU_node(kinfo);
     if ( ret )
         goto err;
 
@@ -1776,7 +1780,7 @@ static int __init prepare_dtb_domU(struct domain *d, struct kernel_info *kinfo)
     {
         ret = -EINVAL;
 #ifdef CONFIG_SBSA_VUART_CONSOLE
-        ret = make_vpl011_uart_node(d, kinfo->fdt);
+        ret = make_vpl011_uart_node(kinfo);
 #endif
         if ( ret )
             goto err;
@@ -1808,6 +1812,7 @@ static int __init prepare_dtb_hwdom(struct domain *d, struct kernel_info *kinfo)
 
     ASSERT(dt_host && (dt_host->sibling == NULL));
 
+    kinfo->phandle_gic = dt_interrupt_controller->phandle;
     fdt = device_tree_flattened;
 
     new_size = fdt_totalsize(fdt) + DOM0_FDT_EXTRA_SIZE;
diff --git a/xen/include/asm-arm/kernel.h b/xen/include/asm-arm/kernel.h
index 33f3e72b11..43fa87545e 100644
--- a/xen/include/asm-arm/kernel.h
+++ b/xen/include/asm-arm/kernel.h
@@ -36,6 +36,9 @@ struct kernel_info {
     /* Enable pl011 emulation */
     bool vpl011;
 
+    /* GIC phandle */
+    uint32_t phandle_gic;
+
     /* loader to use for this kernel */
     void (*load)(struct kernel_info *info);
     /* loader specific state */
-- 
2.17.1


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