[Xen-changelog] [xen master] x86/AMD: Allow more fine-grained control of VMCB MSR Permission Map

[patchbot@xxxxxxx]

commit 6f3c6d1ed8d2c8b6cd5d9689159e3647bf428dcd
Author:     Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
AuthorDate: Mon Apr 15 11:23:25 2013 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Apr 15 11:23:25 2013 +0200

    x86/AMD: Allow more fine-grained control of VMCB MSR Permission Map
    
    Currently VMCB's MSRPM can be updated to either intercept both reads and
    writes to an MSR or not intercept neither. In some cases we may want to
    be more selective and intercept one but not the other.
    
    Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
    Reviewed-by: Dietmar Hahn <dietmar.hahn@xxxxxxxxxxxxxx>
---
 xen/arch/x86/hvm/svm/svm.c         |   15 +++++++--------
 xen/include/asm-x86/hvm/svm/vmcb.h |    8 ++++++--
 2 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index f170ffb..8ce37c9 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -137,7 +137,7 @@ svm_msrbit(unsigned long *msr_bitmap, uint32_t msr)
     return msr_bit;
 }
 
-void svm_intercept_msr(struct vcpu *v, uint32_t msr, int enable)
+void svm_intercept_msr(struct vcpu *v, uint32_t msr, int flags)
 {
     unsigned long *msr_bit;
 
@@ -145,16 +145,15 @@ void svm_intercept_msr(struct vcpu *v, uint32_t msr, int 
enable)
     BUG_ON(msr_bit == NULL);
     msr &= 0x1fff;
 
-    if ( enable )
-    {
-        __set_bit(msr * 2, msr_bit);
+    if ( flags & MSR_INTERCEPT_READ )
+         __set_bit(msr * 2, msr_bit);
+    else
+         __clear_bit(msr * 2, msr_bit);
+
+    if ( flags & MSR_INTERCEPT_WRITE )
         __set_bit(msr * 2 + 1, msr_bit);
-    }
     else
-    {
-        __clear_bit(msr * 2, msr_bit);
         __clear_bit(msr * 2 + 1, msr_bit);
-    }
 }
 
 static void svm_save_dr(struct vcpu *v)
diff --git a/xen/include/asm-x86/hvm/svm/vmcb.h 
b/xen/include/asm-x86/hvm/svm/vmcb.h
index b7c0404..ade4bb2 100644
--- a/xen/include/asm-x86/hvm/svm/vmcb.h
+++ b/xen/include/asm-x86/hvm/svm/vmcb.h
@@ -531,9 +531,13 @@ void svm_destroy_vmcb(struct vcpu *v);
 
 void setup_vmcb_dump(void);
 
+#define MSR_INTERCEPT_NONE    0
+#define MSR_INTERCEPT_READ    1
+#define MSR_INTERCEPT_WRITE   2
+#define MSR_INTERCEPT_RW      (MSR_INTERCEPT_WRITE | MSR_INTERCEPT_READ)
 void svm_intercept_msr(struct vcpu *v, uint32_t msr, int enable);
-#define svm_disable_intercept_for_msr(v, msr) svm_intercept_msr((v), (msr), 0)
-#define svm_enable_intercept_for_msr(v, msr) svm_intercept_msr((v), (msr), 1)
+#define svm_disable_intercept_for_msr(v, msr) svm_intercept_msr((v), (msr), 
MSR_INTERCEPT_NONE)
+#define svm_enable_intercept_for_msr(v, msr) svm_intercept_msr((v), (msr), 
MSR_INTERCEPT_RW)
 
 /*
  * VMCB accessor functions.
--
generated by git-patchbot for /home/xen/git/xen.git#master

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