[Xen-changelog] [xen master] x86/hvm/viridian: stop open coding updates to APIC registers

[patchbot@xxxxxxx]

commit 1fea389864bd278305a07a139f5f362db70df495
Author:     Paul Durrant <paul.durrant@xxxxxxxxxx>
AuthorDate: Fri Dec 7 17:50:08 2018 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Dec 10 11:32:33 2018 +0000

    x86/hvm/viridian: stop open coding updates to APIC registers
    
    The code in viridian_synic_wrmsr() duplicates logic in vlapic_reg_write()
    to update the ICR, ICR2 and TASKPRI registers. Instead of doing this,
    make vlapic_reg_write() non-static and call it.
    
    Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    
    Rename "offset" to "reg" for consistency with the rest of the vlapic API.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/viridian/synic.c | 15 +++++----------
 xen/arch/x86/hvm/vlapic.c         | 15 +++++++--------
 xen/include/asm-x86/hvm/vlapic.h  |  2 ++
 3 files changed, 14 insertions(+), 18 deletions(-)

diff --git a/xen/arch/x86/hvm/viridian/synic.c 
b/xen/arch/x86/hvm/viridian/synic.c
index 845029b568..a6ebbbc9f5 100644
--- a/xen/arch/x86/hvm/viridian/synic.c
+++ b/xen/arch/x86/hvm/viridian/synic.c
@@ -84,18 +84,13 @@ int viridian_synic_wrmsr(struct vcpu *v, uint32_t idx, 
uint64_t val)
         vlapic_EOI_set(vcpu_vlapic(v));
         break;
 
-    case HV_X64_MSR_ICR: {
-        u32 eax = (u32)val, edx = (u32)(val >> 32);
-        struct vlapic *vlapic = vcpu_vlapic(v);
-        eax &= ~(1 << 12);
-        edx &= 0xff000000;
-        vlapic_set_reg(vlapic, APIC_ICR2, edx);
-        vlapic_ipi(vlapic, eax, edx);
-        vlapic_set_reg(vlapic, APIC_ICR, eax);
+    case HV_X64_MSR_ICR:
+        vlapic_reg_write(v, APIC_ICR2, val >> 32);
+        vlapic_reg_write(v, APIC_ICR, val);
         break;
-    }
+
     case HV_X64_MSR_TPR:
-        vlapic_set_reg(vcpu_vlapic(v), APIC_TASKPRI, (uint8_t)val);
+        vlapic_reg_write(v, APIC_TASKPRI, val);
         break;
 
     case HV_X64_MSR_VP_ASSIST_PAGE:
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index d318f3441a..d3a5fb5d3f 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -775,14 +775,13 @@ static void vlapic_update_timer(struct vlapic *vlapic, 
uint32_t lvtt,
     }
 }
 
-static void vlapic_reg_write(struct vcpu *v,
-                             unsigned int offset, uint32_t val)
+void vlapic_reg_write(struct vcpu *v, unsigned int reg, uint32_t val)
 {
     struct vlapic *vlapic = vcpu_vlapic(v);
 
     memset(&vlapic->loaded, 0, sizeof(vlapic->loaded));
 
-    switch ( offset )
+    switch ( reg )
     {
     case APIC_ID:
         vlapic_set_reg(vlapic, APIC_ID, val);
@@ -857,16 +856,16 @@ static void vlapic_reg_write(struct vcpu *v,
     case APIC_LVTERR:       /* LVT Error Reg */
         if ( vlapic_sw_disabled(vlapic) )
             val |= APIC_LVT_MASKED;
-        val &= vlapic_lvt_mask[(offset - APIC_LVTT) >> 4];
-        vlapic_set_reg(vlapic, offset, val);
-        if ( offset == APIC_LVT0 )
+        val &= vlapic_lvt_mask[(reg - APIC_LVTT) >> 4];
+        vlapic_set_reg(vlapic, reg, val);
+        if ( reg == APIC_LVT0 )
         {
             vlapic_adjust_i8259_target(v->domain);
             pt_may_unmask_irq(v->domain, NULL);
         }
-        if ( (offset == APIC_LVTT) && !(val & APIC_LVT_MASKED) )
+        if ( (reg == APIC_LVTT) && !(val & APIC_LVT_MASKED) )
             pt_may_unmask_irq(NULL, &vlapic->pt);
-        if ( offset == APIC_LVTPC )
+        if ( reg == APIC_LVTPC )
             vpmu_lvtpc_update(val);
         break;
 
diff --git a/xen/include/asm-x86/hvm/vlapic.h b/xen/include/asm-x86/hvm/vlapic.h
index 4eb40750bc..5938be2523 100644
--- a/xen/include/asm-x86/hvm/vlapic.h
+++ b/xen/include/asm-x86/hvm/vlapic.h
@@ -108,6 +108,8 @@ static inline void vlapic_set_reg(
     *((uint32_t *)(&vlapic->regs->data[reg])) = val;
 }
 
+void vlapic_reg_write(struct vcpu *v, unsigned int reg, uint32_t val);
+
 bool_t is_vlapic_lvtpc_enabled(struct vlapic *vlapic);
 
 bool vlapic_test_irq(const struct vlapic *vlapic, uint8_t vec);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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