From: Patrick G. Bridges <bridges@cs.unm.edu>
Date: Tue, 22 May 2012 19:52:40 +0000 (-0600)
Subject: Added hypercall to read host TSC
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=22d574d818e8cdcf63a054915e4cbaec07a2b533;p=palacios.releases.git

Added hypercall to read host TSC
---

diff --git a/palacios/include/palacios/vmm_hypercall.h b/palacios/include/palacios/vmm_hypercall.h
index 4304790..575a9bb 100644
--- a/palacios/include/palacios/vmm_hypercall.h
+++ b/palacios/include/palacios/vmm_hypercall.h
@@ -51,7 +51,8 @@ typedef enum {
     BALLOON_START_HCALL =  0xba00,         // RAX: size
     BALLOON_QUERY_HCALL =  0xba01,         // RCX: req_pgs(out), RDX: alloc_pgs(out)
     OS_DEBUG_HCALL =       0xc0c0,          // RBX: msg_gpa, RCX: msg_len, RDX: buf_is_va (flag)
-    TIME_CPUFREQ_HCALL   =  0xd000       //RCX: cpu freq (out)
+    TIME_CPUFREQ_HCALL  =  0xd000,       //RBX: cpu freq (out)
+    TIME_RDHTSC_HCALL   =  0xd001,       //RBX: cpu freq (out)
 } hcall_id_t;
 
 
diff --git a/palacios/src/palacios/vmm_time.c b/palacios/src/palacios/vmm_time.c
index 5b3bfe7..7cf7853 100644
--- a/palacios/src/palacios/vmm_time.c
+++ b/palacios/src/palacios/vmm_time.c
@@ -84,6 +84,16 @@ static int handle_cpufreq_hcall(struct guest_info * info, uint_t hcall_id, void
     return 0;
 }
 
+static int handle_rdhtsc_hcall(struct guest_info * info, uint_t hcall_id, void * priv_data) {
+    struct vm_core_time * time_state = &(info->time_state);
+
+    info->vm_regs.rbx = v3_get_host_time(time_state);
+
+    // PrintDebug("Guest request host TSC: return %ld\n", (long)info->vm_regs.rbx);
+    
+    return 0;
+}
+
 
 
 int v3_start_time(struct guest_info * info) {
@@ -393,6 +403,9 @@ int v3_init_time_vm(struct v3_vm_info * vm) {
     PrintDebug("Registering TIME_CPUFREQ hypercall.\n");
     ret = v3_register_hypercall(vm, TIME_CPUFREQ_HCALL, 
 				handle_cpufreq_hcall, NULL);
+    PrintDebug("Registering TIME_RDHTSC hypercall.\n");
+    ret = v3_register_hypercall(vm, TIME_RDHTSC_HCALL, 
+				handle_rdhtsc_hcall, NULL);
 
     handle_time_configuration(vm, v3_cfg_subtree(cfg_tree, "time"));