[Xen-devel] [PATCH] vmx: set DR7 via DOMCTL_setvcpucontext

[Kouya Shimura <kouya@xxxxxxxxxxxxxx>]

This patch is needed for a guest domain debugger 
to support hardware watchpoint.

Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx>

diff -r 22c89412fc8c xen/arch/x86/domain.c
--- a/xen/arch/x86/domain.c     Wed Oct 15 15:58:09 2008 +0100
+++ b/xen/arch/x86/domain.c     Thu Oct 16 16:50:45 2008 +0900
@@ -575,7 +575,10 @@ int arch_set_info_guest(
     v->arch.guest_context.user_regs.eflags |= 2;
 
     if ( is_hvm_vcpu(v) )
+    {
+        hvm_set_info_guest(v);
         goto out;
+    }
 
     /* Only CR0.TS is modifiable by guest or admin. */
     v->arch.guest_context.ctrlreg[0] &= X86_CR0_TS;
diff -r 22c89412fc8c xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c        Wed Oct 15 15:58:09 2008 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c        Thu Oct 16 16:50:45 2008 +0900
@@ -1184,6 +1184,13 @@ static void vmx_set_uc_mode(struct vcpu 
     vpid_sync_all();
 }
 
+static void vmx_set_info_guest(struct vcpu *v)
+{
+    vmx_vmcs_enter(v);
+    __vmwrite(GUEST_DR7, v->arch.guest_context.debugreg[7]);
+    vmx_vmcs_exit(v);
+}
+
 static struct hvm_function_table vmx_function_table = {
     .name                 = "VMX",
     .domain_initialise    = vmx_domain_initialise,
@@ -1214,7 +1221,8 @@ static struct hvm_function_table vmx_fun
     .msr_read_intercept   = vmx_msr_read_intercept,
     .msr_write_intercept  = vmx_msr_write_intercept,
     .invlpg_intercept     = vmx_invlpg_intercept,
-    .set_uc_mode          = vmx_set_uc_mode
+    .set_uc_mode          = vmx_set_uc_mode,
+    .set_info_guest       = vmx_set_info_guest
 };
 
 static unsigned long *vpid_bitmap;
diff -r 22c89412fc8c xen/include/asm-x86/hvm/hvm.h
--- a/xen/include/asm-x86/hvm/hvm.h     Wed Oct 15 15:58:09 2008 +0100
+++ b/xen/include/asm-x86/hvm/hvm.h     Thu Oct 16 16:50:45 2008 +0900
@@ -128,6 +128,7 @@ struct hvm_function_table {
     int (*msr_write_intercept)(struct cpu_user_regs *regs);
     void (*invlpg_intercept)(unsigned long vaddr);
     void (*set_uc_mode)(struct vcpu *v);
+    void (*set_info_guest)(struct vcpu *v);
 };
 
 extern struct hvm_function_table hvm_funcs;
@@ -314,4 +315,10 @@ int hvm_virtual_to_linear_addr(
     unsigned int addr_size,
     unsigned long *linear_addr);
 
+static inline void hvm_set_info_guest(struct vcpu *v)
+{
+    if ( hvm_funcs.set_info_guest )
+        return hvm_funcs.set_info_guest(v);
+}
+
 #endif /* __ASM_X86_HVM_HVM_H__ */

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