[V10 PATCH 06/23] PVH xen: vmx related preparatory changes for PVH

[Mukesh Rathor <mukesh.rathor@oracle.com>]

This is another preparatory patch for PVH. In this patch, following
functions are made available for general/public use:
    vmx_fpu_enter(), get_instruction_length(), update_guest_eip(),
    and vmx_dr_access().

There is no functionality change.

Changes in V2:
  - prepend vmx_ to get_instruction_length and update_guest_eip.
  - Do not export/use vmr().

Changes in V3:
  - Do not change emulate_forced_invalid_op() in this patch.

Changes in V7:
  - Drop pv_cpuid going public here.

Changes in V8:
  - Move vmx_fpu_enter prototype from vmcs.h to vmx.h

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
---
 xen/arch/x86/hvm/vmx/vmx.c        |   72 +++++++++++++++---------------------
 xen/arch/x86/hvm/vmx/vvmx.c       |    2 +-
 xen/include/asm-x86/hvm/vmx/vmx.h |   17 ++++++++-
 3 files changed, 47 insertions(+), 44 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 8ed7026..7292357 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -577,7 +577,7 @@ static int vmx_load_vmcs_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
     return 0;
 }
 
-static void vmx_fpu_enter(struct vcpu *v)
+void vmx_fpu_enter(struct vcpu *v)
 {
     vcpu_restore_fpu_lazy(v);
     v->arch.hvm_vmx.exception_bitmap &= ~(1u << TRAP_no_device);
@@ -1608,24 +1608,12 @@ const struct hvm_function_table * __init start_vmx(void)
     return &vmx_function_table;
 }
 
-/*
- * Not all cases receive valid value in the VM-exit instruction length field.
- * Callers must know what they're doing!
- */
-static int get_instruction_length(void)
-{
-    int len;
-    len = __vmread(VM_EXIT_INSTRUCTION_LEN); /* Safe: callers audited */
-    BUG_ON((len < 1) || (len > 15));
-    return len;
-}
-
-void update_guest_eip(void)
+void vmx_update_guest_eip(void)
 {
     struct cpu_user_regs *regs = guest_cpu_user_regs();
     unsigned long x;
 
-    regs->eip += get_instruction_length(); /* Safe: callers audited */
+    regs->eip += vmx_get_instruction_length(); /* Safe: callers audited */
     regs->eflags &= ~X86_EFLAGS_RF;
 
     x = __vmread(GUEST_INTERRUPTIBILITY_INFO);
@@ -1698,8 +1686,8 @@ static void vmx_do_cpuid(struct cpu_user_regs *regs)
     regs->edx = edx;
 }
 
-static void vmx_dr_access(unsigned long exit_qualification,
-                          struct cpu_user_regs *regs)
+void vmx_dr_access(unsigned long exit_qualification,
+                   struct cpu_user_regs *regs)
 {
     struct vcpu *v = current;
 
@@ -2312,7 +2300,7 @@ static int vmx_handle_eoi_write(void)
     if ( (((exit_qualification >> 12) & 0xf) == 1) &&
          ((exit_qualification & 0xfff) == APIC_EOI) )
     {
-        update_guest_eip(); /* Safe: APIC data write */
+        vmx_update_guest_eip(); /* Safe: APIC data write */
         vlapic_EOI_set(vcpu_vlapic(current));
         HVMTRACE_0D(VLAPIC);
         return 1;
@@ -2525,7 +2513,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
             HVMTRACE_1D(TRAP, vector);
             if ( v->domain->debugger_attached )
             {
-                update_guest_eip(); /* Safe: INT3 */            
+                vmx_update_guest_eip(); /* Safe: INT3 */
                 current->arch.gdbsx_vcpu_event = TRAP_int3;
                 domain_pause_for_debugger();
                 break;
@@ -2633,7 +2621,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
          */
         inst_len = ((source != 3) ||        /* CALL, IRET, or JMP? */
                     (idtv_info & (1u<<10))) /* IntrType > 3? */
-            ? get_instruction_length() /* Safe: SDM 3B 23.2.4 */ : 0;
+            ? vmx_get_instruction_length() /* Safe: SDM 3B 23.2.4 */ : 0;
         if ( (source == 3) && (idtv_info & INTR_INFO_DELIVER_CODE_MASK) )
             ecode = __vmread(IDT_VECTORING_ERROR_CODE);
         regs->eip += inst_len;
@@ -2641,15 +2629,15 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
         break;
     }
     case EXIT_REASON_CPUID:
-        update_guest_eip(); /* Safe: CPUID */
+        vmx_update_guest_eip(); /* Safe: CPUID */
         vmx_do_cpuid(regs);
         break;
     case EXIT_REASON_HLT:
-        update_guest_eip(); /* Safe: HLT */
+        vmx_update_guest_eip(); /* Safe: HLT */
         hvm_hlt(regs->eflags);
         break;
     case EXIT_REASON_INVLPG:
-        update_guest_eip(); /* Safe: INVLPG */
+        vmx_update_guest_eip(); /* Safe: INVLPG */
         exit_qualification = __vmread(EXIT_QUALIFICATION);
         vmx_invlpg_intercept(exit_qualification);
         break;
@@ -2657,7 +2645,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
         regs->ecx = hvm_msr_tsc_aux(v);
         /* fall through */
     case EXIT_REASON_RDTSC:
-        update_guest_eip(); /* Safe: RDTSC, RDTSCP */
+        vmx_update_guest_eip(); /* Safe: RDTSC, RDTSCP */
         hvm_rdtsc_intercept(regs);
         break;
     case EXIT_REASON_VMCALL:
@@ -2667,7 +2655,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
         rc = hvm_do_hypercall(regs);
         if ( rc != HVM_HCALL_preempted )
         {
-            update_guest_eip(); /* Safe: VMCALL */
+            vmx_update_guest_eip(); /* Safe: VMCALL */
             if ( rc == HVM_HCALL_invalidate )
                 send_invalidate_req();
         }
@@ -2677,7 +2665,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
     {
         exit_qualification = __vmread(EXIT_QUALIFICATION);
         if ( vmx_cr_access(exit_qualification) == X86EMUL_OKAY )
-            update_guest_eip(); /* Safe: MOV Cn, LMSW, CLTS */
+            vmx_update_guest_eip(); /* Safe: MOV Cn, LMSW, CLTS */
         break;
     }
     case EXIT_REASON_DR_ACCESS:
@@ -2691,7 +2679,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
         {
             regs->eax = (uint32_t)msr_content;
             regs->edx = (uint32_t)(msr_content >> 32);
-            update_guest_eip(); /* Safe: RDMSR */
+            vmx_update_guest_eip(); /* Safe: RDMSR */
         }
         break;
     }
@@ -2700,63 +2688,63 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
         uint64_t msr_content;
         msr_content = ((uint64_t)regs->edx << 32) | (uint32_t)regs->eax;
         if ( hvm_msr_write_intercept(regs->ecx, msr_content) == X86EMUL_OKAY )
-            update_guest_eip(); /* Safe: WRMSR */
+            vmx_update_guest_eip(); /* Safe: WRMSR */
         break;
     }
 
     case EXIT_REASON_VMXOFF:
         if ( nvmx_handle_vmxoff(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMXON:
         if ( nvmx_handle_vmxon(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMCLEAR:
         if ( nvmx_handle_vmclear(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
  
     case EXIT_REASON_VMPTRLD:
         if ( nvmx_handle_vmptrld(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMPTRST:
         if ( nvmx_handle_vmptrst(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMREAD:
         if ( nvmx_handle_vmread(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
  
     case EXIT_REASON_VMWRITE:
         if ( nvmx_handle_vmwrite(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMLAUNCH:
         if ( nvmx_handle_vmlaunch(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_VMRESUME:
         if ( nvmx_handle_vmresume(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_INVEPT:
         if ( nvmx_handle_invept(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_INVVPID:
         if ( nvmx_handle_invvpid(regs) == X86EMUL_OKAY )
-            update_guest_eip();
+            vmx_update_guest_eip();
         break;
 
     case EXIT_REASON_MWAIT_INSTRUCTION:
@@ -2804,14 +2792,14 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
             int bytes = (exit_qualification & 0x07) + 1;
             int dir = (exit_qualification & 0x08) ? IOREQ_READ : IOREQ_WRITE;
             if ( handle_pio(port, bytes, dir) )
-                update_guest_eip(); /* Safe: IN, OUT */
+                vmx_update_guest_eip(); /* Safe: IN, OUT */
         }
         break;
 
     case EXIT_REASON_INVD:
     case EXIT_REASON_WBINVD:
     {
-        update_guest_eip(); /* Safe: INVD, WBINVD */
+        vmx_update_guest_eip(); /* Safe: INVD, WBINVD */
         vmx_wbinvd_intercept();
         break;
     }
@@ -2843,7 +2831,7 @@ void vmx_vmexit_handler(struct cpu_user_regs *regs)
     case EXIT_REASON_XSETBV:
         if ( hvm_handle_xsetbv(regs->ecx,
                                (regs->rdx << 32) | regs->_eax) == 0 )
-            update_guest_eip(); /* Safe: XSETBV */
+            vmx_update_guest_eip(); /* Safe: XSETBV */
         break;
 
     case EXIT_REASON_APIC_WRITE:
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 5dfbc54..82be4cc 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -2139,7 +2139,7 @@ int nvmx_n2_vmexit_handler(struct cpu_user_regs *regs,
             tsc += __get_vvmcs(nvcpu->nv_vvmcx, TSC_OFFSET);
             regs->eax = (uint32_t)tsc;
             regs->edx = (uint32_t)(tsc >> 32);
-            update_guest_eip();
+            vmx_update_guest_eip();
 
             return 1;
         }
diff --git a/xen/include/asm-x86/hvm/vmx/vmx.h b/xen/include/asm-x86/hvm/vmx/vmx.h
index c33b9f9..c21a303 100644
--- a/xen/include/asm-x86/hvm/vmx/vmx.h
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h
@@ -446,6 +446,18 @@ static inline int __vmxon(u64 addr)
     return rc;
 }
 
+/*
+ * Not all cases receive valid value in the VM-exit instruction length field.
+ * Callers must know what they're doing!
+ */
+static inline int vmx_get_instruction_length(void)
+{
+    int len;
+    len = __vmread(VM_EXIT_INSTRUCTION_LEN); /* Safe: callers audited */
+    BUG_ON((len < 1) || (len > 15));
+    return len;
+}
+
 void vmx_get_segment_register(struct vcpu *, enum x86_segment,
                               struct segment_register *);
 void vmx_inject_extint(int trap);
@@ -457,7 +469,10 @@ void ept_p2m_uninit(struct p2m_domain *p2m);
 void ept_walk_table(struct domain *d, unsigned long gfn);
 void setup_ept_dump(void);
 
-void update_guest_eip(void);
+void vmx_update_guest_eip(void);
+void vmx_dr_access(unsigned long exit_qualification,
+                   struct cpu_user_regs *regs);
+void vmx_fpu_enter(struct vcpu *v);
 
 int alloc_p2m_hap_data(struct p2m_domain *p2m);
 void free_p2m_hap_data(struct p2m_domain *p2m);
-- 
1.7.2.3