bitkeeper revision 1.498.1.1 (3f8707eaKlkrjYr25jktT_f0NAFf1A)

New dom0 op to read/write msr's from privileged domains, mainly so you can use perfomance counters.

.rootkeys

@@ -616,6 +616,7 @@
 3e5a4e673p7PEOyHFm3nHkYX6HQYBg xenolinux-2.4.22-sparse/include/asm-xeno/irq.h
 3ead095db_LRUXnxaqs0dA1DWhPoQQ xenolinux-2.4.22-sparse/include/asm-xeno/keyboard.h
 3e5a4e678ddsQOpbSiRdy1GRcDc9WA xenolinux-2.4.22-sparse/include/asm-xeno/mmu_context.h
+3f8707e7ZmZ6TxyX0ZUEfvhA2Pb_xQ xenolinux-2.4.22-sparse/include/asm-xeno/msr.h
 3e7270deQqtGPSnFxcW4AvJZuTUWfg xenolinux-2.4.22-sparse/include/asm-xeno/multicall.h
 3e5a4e67mnQfh-R8KcQCaVo2Oho6yg xenolinux-2.4.22-sparse/include/asm-xeno/page.h
 3e5a4e67uTYU5oEnIDjxuaez8njjqg xenolinux-2.4.22-sparse/include/asm-xeno/pgalloc.h

xen/common/dom0_ops.c

@@ -14,6 +14,7 @@
 #include <xeno/sched.h>
 #include <xeno/event.h>
 #include <asm/domain_page.h>
+#include <asm/msr.h>
 
 extern unsigned int alloc_new_dom_mem(struct task_struct *, unsigned int);
 
@@ -61,6 +62,24 @@ static void build_page_list(struct task_struct *p)
 
     unmap_domain_mem(list);
 }
+
+static int msr_cpu_mask;
+static unsigned long msr_addr;
+static unsigned long msr_lo;
+static unsigned long msr_hi;
+
+static void write_msr_for(void *unused)
+{
+    if (((1 << current->processor) & msr_cpu_mask))
+        wrmsr(msr_addr, msr_lo, msr_hi);
+}
+
+static void read_msr_for(void *unused)
+{
+    if (((1 << current->processor) & msr_cpu_mask))
+	rdmsr(msr_addr, msr_lo, msr_hi);
+}
+
     
 long do_dom0_op(dom0_op_t *u_dom0_op)
 {
@@ -262,6 +281,33 @@ long do_dom0_op(dom0_op_t *u_dom0_op)
     }
     break;
 
+    case DOM0_MSR:
+    {
+      if (op.u.msr.write)
+	{
+	  msr_cpu_mask = op.u.msr.cpu_mask;
+	  msr_addr = op.u.msr.msr;
+	  msr_lo = op.u.msr.in1;
+	  msr_hi = op.u.msr.in2;
+	  smp_call_function(write_msr_for, NULL, 1, 1);
+	  write_msr_for(NULL);
+	}
+      else
+	{
+          msr_cpu_mask = op.u.msr.cpu_mask;
+          msr_addr = op.u.msr.msr;
+	  smp_call_function(read_msr_for, NULL, 1, 1);
+	  read_msr_for(NULL);
+
+          op.u.msr.out1 = msr_lo;
+          op.u.msr.out2 = msr_hi;
+	  copy_to_user(u_dom0_op, &op, sizeof(op));
+	}
+      ret = 0;
+    }
+    break;
+
+
     default:
         ret = -ENOSYS;
 

xen/common/keyhandler.c

@@ -128,6 +128,26 @@ void do_task_queues(u_char key, void *dev_id, struct pt_regs *regs)
     read_unlock_irqrestore(&tasklist_lock, flags); 
 }
 
+void cpu_counters(u_char key, void *dev_id, struct pt_regs *regs)
+{
+    printk("CPU performance counters for CPU %d (current):\n",
+        smp_processor_id());
+    {
+        unsigned int one1,one2,zero1,zero2;
+        rdmsr(MSR_P6_PERFCTR0, zero1, zero2);
+        rdmsr(MSR_P6_PERFCTR1, one1, one2);
+        printk("CPU%02d counter0=0x%02x:%08x  counter1=0x%02x:%08x\n",
+           smp_processor_id(), zero2,zero1,one2,one1 );
+    }
+}
+
+void cpu_counters_reset(u_char key, void *dev_id, struct pt_regs *regs)
+{
+    printk("Reset CPU performance counters for CPU %d (current):\n",
+	smp_processor_id());
+    wrmsr(MSR_P6_PERFCTR0,0,0);
+    wrmsr(MSR_P6_PERFCTR1,0,0);
+}
 
 extern void perfc_printall (u_char key, void *dev_id, struct pt_regs *regs);
 extern void perfc_reset (u_char key, void *dev_id, struct pt_regs *regs);
@@ -155,6 +175,7 @@ void initialize_keytable()
     add_key_handler('r', dump_runq,      "dump run queues");
     add_key_handler('B', kill_dom0,      "reboot machine gracefully"); 
     add_key_handler('R', halt_machine,   "reboot machine ungracefully"); 
-    
+    add_key_handler('c', cpu_counters,   "CPU performance counters");
+    add_key_handler('C', cpu_counters_reset,"reset CPU perfomance counters");    
     return; 
 }

xen/include/hypervisor-ifs/dom0_ops.h

@@ -20,6 +20,7 @@
 #define DOM0_GETDOMAININFO 12
 #define DOM0_BUILDDOMAIN   13
 #define DOM0_IOPL          14
+#define DOM0_MSR           15
 
 #define MAX_CMD_LEN       256
 #define MAX_DOMAIN_NAME    16
@@ -97,6 +98,16 @@ typedef struct dom0_iopl_st
     unsigned int iopl;
 } dom0_iopl_t;
 
+typedef struct dom0_msr_st
+{
+    /* IN variables. */
+    int write, cpu_mask, msr;
+    unsigned int in1, in2;
+    /* OUT variables. */
+    unsigned int out1, out2;
+
+} dom0_msr_t;
+
 typedef struct dom0_op_st
 {
     unsigned long cmd;
@@ -110,6 +121,7 @@ typedef struct dom0_op_st
         dom_meminfo_t meminfo;
         dom0_getdominfo_t getdominfo;
         dom0_iopl_t iopl;
+	dom0_msr_t msr;
     }
     u;
 } dom0_op_t;

xenolinux-2.4.22-sparse/include/asm-xeno/msr.h

@@ -0,0 +1,138 @@
+#ifndef __ASM_MSR_H
+#define __ASM_MSR_H
+
+/*
+ * Access to machine-specific registers (available on 586 and better only)
+ * Note: the rd* operations modify the parameters directly (without using
+ * pointer indirection), this allows gcc to optimize better
+ */
+
+#define rdmsr(msr,val1,val2) \
+{ \
+  dom0_op_t op; \
+  op.cmd = DOM0_MSR; \
+  op.u.msr.write = 0; \
+  op.u.msr.msr = msr; \
+  op.u.msr.cpu_mask = (1 << current->processor); \
+  HYPERVISOR_dom0_op(&op); \
+  val1 = op.u.msr.out1; \
+  val2 = op.u.msr.out2; \
+}     
+
+#define wrmsr(msr,val1,val2) \
+{ \
+  dom0_op_t op; \
+  op.cmd = DOM0_MSR; \
+  op.u.msr.write = 1; \
+  op.u.msr.cpu_mask = (1 << current->processor); \
+  op.u.msr.msr = msr; \
+  op.u.msr.in1 = val1; \
+  op.u.msr.in2 = val2; \
+  HYPERVISOR_dom0_op(&op); \
+}     
+
+#define rdtsc(low,high) \
+     __asm__ __volatile__("rdtsc" : "=a" (low), "=d" (high))
+
+#define rdtscl(low) \
+     __asm__ __volatile__("rdtsc" : "=a" (low) : : "edx")
+
+#define rdtscll(val) \
+     __asm__ __volatile__("rdtsc" : "=A" (val))
+
+#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)
+
+#define rdpmc(counter,low,high) \
+     __asm__ __volatile__("rdpmc" \
+			  : "=a" (low), "=d" (high) \
+			  : "c" (counter))
+
+/* symbolic names for some interesting MSRs */
+/* Intel defined MSRs. */
+#define MSR_IA32_P5_MC_ADDR		0
+#define MSR_IA32_P5_MC_TYPE		1
+#define MSR_IA32_PLATFORM_ID		0x17
+#define MSR_IA32_EBL_CR_POWERON		0x2a
+
+#define MSR_IA32_APICBASE		0x1b
+#define MSR_IA32_APICBASE_BSP		(1<<8)
+#define MSR_IA32_APICBASE_ENABLE	(1<<11)
+#define MSR_IA32_APICBASE_BASE		(0xfffff<<12)
+
+#define MSR_IA32_UCODE_WRITE		0x79
+#define MSR_IA32_UCODE_REV		0x8b
+
+#define MSR_IA32_BBL_CR_CTL		0x119
+
+#define MSR_IA32_MCG_CAP		0x179
+#define MSR_IA32_MCG_STATUS		0x17a
+#define MSR_IA32_MCG_CTL		0x17b
+
+#define MSR_IA32_THERM_CONTROL		0x19a
+#define MSR_IA32_THERM_INTERRUPT	0x19b
+#define MSR_IA32_THERM_STATUS		0x19c
+#define MSR_IA32_MISC_ENABLE		0x1a0
+
+#define MSR_IA32_DEBUGCTLMSR		0x1d9
+#define MSR_IA32_LASTBRANCHFROMIP	0x1db
+#define MSR_IA32_LASTBRANCHTOIP		0x1dc
+#define MSR_IA32_LASTINTFROMIP		0x1dd
+#define MSR_IA32_LASTINTTOIP		0x1de
+
+#define MSR_IA32_MC0_CTL		0x400
+#define MSR_IA32_MC0_STATUS		0x401
+#define MSR_IA32_MC0_ADDR		0x402
+#define MSR_IA32_MC0_MISC		0x403
+
+#define MSR_P6_PERFCTR0			0xc1
+#define MSR_P6_PERFCTR1			0xc2
+#define MSR_P6_EVNTSEL0			0x186
+#define MSR_P6_EVNTSEL1			0x187
+
+#define MSR_IA32_PERF_STATUS		0x198
+#define MSR_IA32_PERF_CTL		0x199
+
+/* AMD Defined MSRs */
+#define MSR_K6_EFER			0xC0000080
+#define MSR_K6_STAR			0xC0000081
+#define MSR_K6_WHCR			0xC0000082
+#define MSR_K6_UWCCR			0xC0000085
+#define MSR_K6_EPMR			0xC0000086
+#define MSR_K6_PSOR			0xC0000087
+#define MSR_K6_PFIR			0xC0000088
+
+#define MSR_K7_EVNTSEL0			0xC0010000
+#define MSR_K7_PERFCTR0			0xC0010004
+#define MSR_K7_HWCR			0xC0010015
+#define MSR_K7_CLK_CTL			0xC001001b
+#define MSR_K7_FID_VID_CTL		0xC0010041
+#define MSR_K7_VID_STATUS		0xC0010042
+
+/* Centaur-Hauls/IDT defined MSRs. */
+#define MSR_IDT_FCR1			0x107
+#define MSR_IDT_FCR2			0x108
+#define MSR_IDT_FCR3			0x109
+#define MSR_IDT_FCR4			0x10a
+
+#define MSR_IDT_MCR0			0x110
+#define MSR_IDT_MCR1			0x111
+#define MSR_IDT_MCR2			0x112
+#define MSR_IDT_MCR3			0x113
+#define MSR_IDT_MCR4			0x114
+#define MSR_IDT_MCR5			0x115
+#define MSR_IDT_MCR6			0x116
+#define MSR_IDT_MCR7			0x117
+#define MSR_IDT_MCR_CTRL		0x120
+
+/* VIA Cyrix defined MSRs*/
+#define MSR_VIA_FCR			0x1107
+#define MSR_VIA_LONGHAUL		0x110a
+#define MSR_VIA_BCR2			0x1147
+
+/* Transmeta defined MSRs */
+#define MSR_TMTA_LONGRUN_CTRL		0x80868010
+#define MSR_TMTA_LONGRUN_FLAGS		0x80868011
+#define MSR_TMTA_LRTI_READOUT		0x80868018
+#define MSR_TMTA_LRTI_VOLT_MHZ		0x8086801a
+
+#endif /* __ASM_MSR_H */

xenolinux-2.4.22-sparse/mkbuildtree

@@ -130,7 +130,6 @@ ln -sf ../asm-i386/mmx.h
 ln -sf ../asm-i386/module.h 
 ln -sf ../asm-i386/mpspec.h 
 ln -sf ../asm-i386/msgbuf.h 
-ln -sf ../asm-i386/msr.h 
 ln -sf ../asm-i386/mtrr.h 
 ln -sf ../asm-i386/namei.h 
 ln -sf ../asm-i386/param.h