[Xen-devel] [PATCH v10 06/20] vmx: Merge MSR management routines

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

vmx_add_host_load_msr() and vmx_add_guest_msr() share fair amount of code. Merge
them to simplify code maintenance.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        | 84 +++++++++++++++++++-------------------
 xen/arch/x86/hvm/vmx/vmx.c         |  4 +-
 xen/arch/x86/hvm/vmx/vpmu_core2.c  |  4 +-
 xen/include/asm-x86/hvm/vmx/vmcs.h |  7 +++-
 4 files changed, 50 insertions(+), 49 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 4a4f4e1..cf00493 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1176,64 +1176,62 @@ int vmx_write_guest_msr(u32 msr, u64 val)
     return -ESRCH;
 }
 
-int vmx_add_guest_msr(u32 msr)
+int vmx_add_msr(u32 msr, u8 type)
 {
     struct vcpu *curr = current;
-    unsigned int i, msr_count = curr->arch.hvm_vmx.msr_count;
-    struct vmx_msr_entry *msr_area = curr->arch.hvm_vmx.msr_area;
+    unsigned int idx, *msr_count;
+    struct vmx_msr_entry **msr_area, *msr_area_elem;
+
+    if ( type == VMX_GUEST_MSR )
+    {
+        msr_count = &curr->arch.hvm_vmx.msr_count;
+        msr_area = &curr->arch.hvm_vmx.msr_area;
+    }
+    else
+    {
+        ASSERT(type == VMX_HOST_MSR);
+        msr_count = &curr->arch.hvm_vmx.host_msr_count;
+        msr_area = &curr->arch.hvm_vmx.host_msr_area;
+    }
 
-    if ( msr_area == NULL )
+    if ( *msr_area == NULL )
     {
-        if ( (msr_area = alloc_xenheap_page()) == NULL )
+        if ( (*msr_area = alloc_xenheap_page()) == NULL )
             return -ENOMEM;
-        curr->arch.hvm_vmx.msr_area = msr_area;
-        __vmwrite(VM_EXIT_MSR_STORE_ADDR, virt_to_maddr(msr_area));
-        __vmwrite(VM_ENTRY_MSR_LOAD_ADDR, virt_to_maddr(msr_area));
+
+        if ( type == VMX_GUEST_MSR )
+        {
+            __vmwrite(VM_EXIT_MSR_STORE_ADDR, virt_to_maddr(*msr_area));
+            __vmwrite(VM_ENTRY_MSR_LOAD_ADDR, virt_to_maddr(*msr_area));
+        }
+        else
+            __vmwrite(VM_EXIT_MSR_LOAD_ADDR, virt_to_maddr(*msr_area));
     }
 
-    for ( i = 0; i < msr_count; i++ )
-        if ( msr_area[i].index == msr )
+    for ( idx = 0; idx < *msr_count; idx++ )
+        if ( (*msr_area)[idx].index == msr )
             return 0;
 
-    if ( msr_count == (PAGE_SIZE / sizeof(struct vmx_msr_entry)) )
+    if ( *msr_count == (PAGE_SIZE / sizeof(struct vmx_msr_entry)) )
         return -ENOSPC;
 
-    msr_area[msr_count].index = msr;
-    msr_area[msr_count].mbz   = 0;
-    msr_area[msr_count].data  = 0;
-    curr->arch.hvm_vmx.msr_count = ++msr_count;
-    __vmwrite(VM_EXIT_MSR_STORE_COUNT, msr_count);
-    __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, msr_count);
+    msr_area_elem = *msr_area + *msr_count;
+    msr_area_elem->index = msr;
+    msr_area_elem->mbz = 0;
 
-    return 0;
-}
+    ++*msr_count;
 
-int vmx_add_host_load_msr(u32 msr)
-{
-    struct vcpu *curr = current;
-    unsigned int i, msr_count = curr->arch.hvm_vmx.host_msr_count;
-    struct vmx_msr_entry *msr_area = curr->arch.hvm_vmx.host_msr_area;
-
-    if ( msr_area == NULL )
+    if ( type == VMX_GUEST_MSR )
     {
-        if ( (msr_area = alloc_xenheap_page()) == NULL )
-            return -ENOMEM;
-        curr->arch.hvm_vmx.host_msr_area = msr_area;
-        __vmwrite(VM_EXIT_MSR_LOAD_ADDR, virt_to_maddr(msr_area));
+        msr_area_elem->data = 0;
+        __vmwrite(VM_EXIT_MSR_STORE_COUNT, *msr_count);
+        __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, *msr_count);
+    }
+    else
+    {
+        rdmsrl(msr, msr_area_elem->data);
+        __vmwrite(VM_EXIT_MSR_LOAD_COUNT, *msr_count);
     }
-
-    for ( i = 0; i < msr_count; i++ )
-        if ( msr_area[i].index == msr )
-            return 0;
-
-    if ( msr_count == (PAGE_SIZE / sizeof(struct vmx_msr_entry)) )
-        return -ENOSPC;
-
-    msr_area[msr_count].index = msr;
-    msr_area[msr_count].mbz   = 0;
-    rdmsrl(msr, msr_area[msr_count].data);
-    curr->arch.hvm_vmx.host_msr_count = ++msr_count;
-    __vmwrite(VM_EXIT_MSR_LOAD_COUNT, msr_count);
 
     return 0;
 }
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 26b1ad5..aaff87b 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -2263,12 +2263,12 @@ static int vmx_msr_write_intercept(unsigned int msr, 
uint64_t msr_content)
 
             for ( ; (rc == 0) && lbr->count; lbr++ )
                 for ( i = 0; (rc == 0) && (i < lbr->count); i++ )
-                    if ( (rc = vmx_add_guest_msr(lbr->base + i)) == 0 )
+                    if ( (rc = vmx_add_msr(lbr->base + i, VMX_GUEST_MSR)) == 0 
)
                         vmx_disable_intercept_for_msr(v, lbr->base + i, 
MSR_TYPE_R | MSR_TYPE_W);
         }
 
         if ( (rc < 0) ||
-             (msr_content && (vmx_add_host_load_msr(msr) < 0)) )
+             (msr_content && (vmx_add_msr(msr, VMX_HOST_MSR) < 0)) )
             hvm_inject_hw_exception(TRAP_machine_check, 0);
         else
             __vmwrite(GUEST_IA32_DEBUGCTL, msr_content);
diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c 
b/xen/arch/x86/hvm/vmx/vpmu_core2.c
index db7bd20..4aa4669 100644
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
@@ -368,10 +368,10 @@ static int core2_vpmu_alloc_resource(struct vcpu *v)
         return 0;
 
     wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
-    if ( vmx_add_host_load_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
+    if ( vmx_add_msr(MSR_CORE_PERF_GLOBAL_CTRL, VMX_HOST_MSR) )
         goto out_err;
 
-    if ( vmx_add_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
+    if ( vmx_add_msr(MSR_CORE_PERF_GLOBAL_CTRL, VMX_GUEST_MSR) )
         goto out_err;
     vmx_write_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL,
                  core2_calc_intial_glb_ctrl_msr());
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 215d93c..6035f16 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -475,12 +475,15 @@ enum vmcs_field {
 
 #define MSR_TYPE_R 1
 #define MSR_TYPE_W 2
+
+#define VMX_GUEST_MSR 0
+#define VMX_HOST_MSR  1
+
 void vmx_disable_intercept_for_msr(struct vcpu *v, u32 msr, int type);
 void vmx_enable_intercept_for_msr(struct vcpu *v, u32 msr, int type);
 int vmx_read_guest_msr(u32 msr, u64 *val);
 int vmx_write_guest_msr(u32 msr, u64 val);
-int vmx_add_guest_msr(u32 msr);
-int vmx_add_host_load_msr(u32 msr);
+int vmx_add_msr(u32 msr, u8 type);
 void vmx_vmcs_switch(struct vmcs_struct *from, struct vmcs_struct *to);
 void vmx_set_eoi_exit_bitmap(struct vcpu *v, u8 vector);
 void vmx_clear_eoi_exit_bitmap(struct vcpu *v, u8 vector);
-- 
1.8.1.4


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