[Xen-devel] [PATCH v4 10/16] Add VMware tool's triggers

[Don Slutz <dslutz@xxxxxxxxxxx>]

These are not the same as the PV control interface; they
are more like the ACPI power event.

For anything to happen when they are used, the domU must
be running a VMware tools daemon that is polling for triggers.

If the domU is running VMware tools, then the "build version" of
the tools is also available via xc_get_HVM_param().  This also
enables the use of new triggers that will use the VMware hyper-call
to do some limited control of the domU.  The most useful are
poweroff and reboot.  Since a guest process needs to be running
for these to work, a tool stack should check that the build version
is non zero before assuming these will work.

The 2 hvm param's HVM_PARAM_VMPORT_BUILD_NUMBER_TIME and
HVM_PARAM_VMPORT_BUILD_NUMBER_VALUE are how "build version" is
accessed.  These 2 params are only allowed to be set to zero.  The
HVM_PARAM_VMPORT_BUILD_NUMBER_TIME can be used to track the last
time the VMware tools in the guest responded.  One such use would
be the health of the tools in the guest.  The hvm param
HVM_PARAM_VMPORT_RESET_TIME controls how often to request them in
seconds minus 1.  The minus 1 is to handle to 0 case.  I.E. the
fastest that can be selected is every second.  The default is 4
times a minute.

XEN_DOMCTL_SENDTRIGGER_VTPING is the same as what is done using
HVM_PARAM_VMPORT_RESET_TIME.  This trigger allows the tool
stack to request a sooner update of HVM_PARAM_VMPORT_BUILD_NUMBER_TIME
and HVM_PARAM_VMPORT_BUILD_NUMBER_VALUE.

Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
---
 xen/arch/x86/domctl.c            | 34 ++++++++++++++++++++++++++++++++++
 xen/include/asm-x86/hvm/vmport.h |  1 +
 xen/include/public/domctl.h      |  3 +++
 3 files changed, 38 insertions(+)

diff --git a/xen/arch/x86/domctl.c b/xen/arch/x86/domctl.c
index 7a5de43..50596a6 100644
--- a/xen/arch/x86/domctl.c
+++ b/xen/arch/x86/domctl.c
@@ -23,6 +23,7 @@
 #include <xen/paging.h>
 #include <asm/irq.h>
 #include <asm/hvm/hvm.h>
+#include <asm/hvm/vmport.h>
 #include <asm/hvm/support.h>
 #include <asm/hvm/cacheattr.h>
 #include <asm/processor.h>
@@ -579,6 +580,39 @@ long arch_do_domctl(
         }
         break;
 
+        case XEN_DOMCTL_SENDTRIGGER_VTPOWER:
+        {
+            ret = -EINVAL;
+            if ( is_hvm_domain(d) )
+            {
+                ret = 0;
+                vmport_ctrl_send(&d->arch.hvm_domain, "OS_Halt");
+            }
+        }
+        break;
+
+        case XEN_DOMCTL_SENDTRIGGER_VTREBOOT:
+        {
+            ret = -EINVAL;
+            if ( is_hvm_domain(d) )
+            {
+                ret = 0;
+                vmport_ctrl_send(&d->arch.hvm_domain, "OS_Reboot");
+            }
+        }
+        break;
+
+        case XEN_DOMCTL_SENDTRIGGER_VTPING:
+        {
+            ret = -EINVAL;
+            if ( is_hvm_domain(d) )
+            {
+                ret = 0;
+                vmport_ctrl_send(&d->arch.hvm_domain, "ping");
+            }
+        }
+        break;
+
         default:
             ret = -ENOSYS;
         }
diff --git a/xen/include/asm-x86/hvm/vmport.h b/xen/include/asm-x86/hvm/vmport.h
index a5c70bb..981e43a 100644
--- a/xen/include/asm-x86/hvm/vmport.h
+++ b/xen/include/asm-x86/hvm/vmport.h
@@ -58,6 +58,7 @@ int vmport_rpc_hvmop_precheck(unsigned long op,
                               struct xen_hvm_vmport_guest_info *a);
 int vmport_rpc_hvmop_do(struct domain *d, unsigned long op,
                         struct xen_hvm_vmport_guest_info *a);
+void vmport_ctrl_send(struct hvm_domain *hd, char *msg);
 
 #endif /* ASM_X86_HVM_VMPORT_H__ */
 
diff --git a/xen/include/public/domctl.h b/xen/include/public/domctl.h
index 7a0f691..2d9a534 100644
--- a/xen/include/public/domctl.h
+++ b/xen/include/public/domctl.h
@@ -462,6 +462,9 @@ DEFINE_XEN_GUEST_HANDLE(xen_domctl_address_size_t);
 #define XEN_DOMCTL_SENDTRIGGER_INIT   2
 #define XEN_DOMCTL_SENDTRIGGER_POWER  3
 #define XEN_DOMCTL_SENDTRIGGER_SLEEP  4
+#define XEN_DOMCTL_SENDTRIGGER_VTPOWER  5
+#define XEN_DOMCTL_SENDTRIGGER_VTREBOOT 6
+#define XEN_DOMCTL_SENDTRIGGER_VTPING   7
 struct xen_domctl_sendtrigger {
     uint32_t  trigger;  /* IN */
     uint32_t  vcpu;     /* IN */
-- 
1.8.4


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