[Xen-devel] [PATCH 02/11] xen/arm: vpl011: Add new hvm params in Xen for ring buffer/event setup

[Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>]

Three new HVM param handlers added for:
    - allocating a new VIRQ and return to the toolstack
    - allocating a new event channel for sending/receiving events from Xen and 
return
      to the toolstack
    - mapping the PFN allocted by the toolstack to be used as IN/OUT ring 
buffers

Signed-off-by: Bhupinder Thakur <bhupinder.thakur@xxxxxxxxxx>
---
 xen/arch/arm/hvm.c              | 39 +++++++++++++++++++++++++++++++++++++++
 xen/include/public/hvm/params.h | 10 +++++++++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/hvm.c b/xen/arch/arm/hvm.c
index d999bde..f3b9eb1 100644
--- a/xen/arch/arm/hvm.c
+++ b/xen/arch/arm/hvm.c
@@ -23,6 +23,8 @@
 #include <xen/guest_access.h>
 #include <xen/sched.h>
 #include <xen/monitor.h>
+#include <xen/event.h>
+#include <xen/vmap.h>
 
 #include <xsm/xsm.h>
 
@@ -31,6 +33,7 @@
 #include <public/hvm/hvm_op.h>
 
 #include <asm/hypercall.h>
+#include "vpl011.h"
 
 long do_hvm_op(unsigned long op, XEN_GUEST_HANDLE_PARAM(void) arg)
 {
@@ -61,9 +64,45 @@ long do_hvm_op(unsigned long op, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         if ( op == HVMOP_set_param )
         {
             d->arch.hvm_domain.params[a.index] = a.value;
+
+#ifdef CONFIG_VPL011_CONSOLE
+            /*
+             * if it is a vpl011 console pfn then map it to its
+             * own address space
+             */
+            if ( a.index == HVM_PARAM_VPL011_CONSOLE_PFN )
+            {
+                vpl011_map_guest_page(d);
+            }
+#else
+            /* 
+             * if VPL011 is not compiled in then disallow setting of any 
+             * related HVM params
+             */
+            if ( a.index == HVM_PARAM_VPL011_CONSOLE_PFN ||
+                 a.index == HVM_PARAM_VPL011_CONSOLE_EVTCHN ||
+                 a.index == HVM_PARAM_VPL011_VIRQ )
+            {
+                rc = -1;
+                goto param_fail;
+            }
+#endif
         }
         else
         {
+#ifndef CONFIG_VPL011_CONSOLE
+            /* 
+             * if VPL011 is not compiled in then disallow setting of any 
+             * related HVM params
+             */
+            if ( a.index == HVM_PARAM_VPL011_CONSOLE_PFN ||
+                 a.index == HVM_PARAM_VPL011_CONSOLE_EVTCHN ||
+                 a.index == HVM_PARAM_VPL011_VIRQ )
+            {
+                rc = -1;
+                goto param_fail;
+            }
+#endif
             a.value = d->arch.hvm_domain.params[a.index];
             rc = copy_to_guest(arg, &a, 1) ? -EFAULT : 0;
         }
diff --git a/xen/include/public/hvm/params.h b/xen/include/public/hvm/params.h
index 3f54a49..13bf719 100644
--- a/xen/include/public/hvm/params.h
+++ b/xen/include/public/hvm/params.h
@@ -203,10 +203,17 @@
  */
 #define HVM_PARAM_ACPI_IOPORTS_LOCATION 19
 
-/* Deprecated */
+#if defined(__arm__) || defined(__aarch64__)
+#define HVM_PARAM_VPL011_CONSOLE_PFN    20
+#define HVM_PARAM_VPL011_CONSOLE_EVTCHN 21
+#define HVM_PARAM_VPL011_VIRQ           22
+#else
 #define HVM_PARAM_MEMORY_EVENT_CR0          20
 #define HVM_PARAM_MEMORY_EVENT_CR3          21
 #define HVM_PARAM_MEMORY_EVENT_CR4          22
+#endif
+
+/* Deprecated */
 #define HVM_PARAM_MEMORY_EVENT_INT3         23
 #define HVM_PARAM_MEMORY_EVENT_SINGLE_STEP  25
 #define HVM_PARAM_MEMORY_EVENT_MSR          30
@@ -253,6 +260,7 @@
  */
 #define HVM_PARAM_X87_FIP_WIDTH 36
 
+
 #define HVM_NR_PARAMS 37
 
 #endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */
-- 
2.7.4


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