[PATCH v2 6/8] x86: rename copy_{from,to}_user() to copy_{from,to}_guest_pv()

[Jan Beulich <jbeulich@xxxxxxxx>]

Bring them (back) in line with __copy_{from,to}_guest_pv(). Since it
falls in the same group, also convert clear_user(). Instead of adjusting
__raw_clear_guest(), drop it - it's unused and would require a non-
checking __clear_guest_pv() which we don't have.

Add previously missing __user at some call sites and in the function
declarations.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/pv/emul-inv-op.c
+++ b/xen/arch/x86/pv/emul-inv-op.c
@@ -33,7 +33,7 @@ static int emulate_forced_invalid_op(str
     eip = regs->rip;
 
     /* Check for forced emulation signature: ud2 ; .ascii "xen". */
-    if ( (rc = copy_from_user(sig, (char *)eip, sizeof(sig))) != 0 )
+    if ( (rc = copy_from_guest_pv(sig, (char __user *)eip, sizeof(sig))) != 0 )
     {
         pv_inject_page_fault(0, eip + sizeof(sig) - rc);
         return EXCRET_fault_fixed;
@@ -43,7 +43,8 @@ static int emulate_forced_invalid_op(str
     eip += sizeof(sig);
 
     /* We only emulate CPUID. */
-    if ( ( rc = copy_from_user(instr, (char *)eip, sizeof(instr))) != 0 )
+    if ( (rc = copy_from_guest_pv(instr, (char __user *)eip,
+                                  sizeof(instr))) != 0 )
     {
         pv_inject_page_fault(0, eip + sizeof(instr) - rc);
         return EXCRET_fault_fixed;
--- a/xen/arch/x86/pv/iret.c
+++ b/xen/arch/x86/pv/iret.c
@@ -54,8 +54,8 @@ unsigned long do_iret(void)
     struct iret_context iret_saved;
     struct vcpu *v = current;
 
-    if ( unlikely(copy_from_user(&iret_saved, (void *)regs->rsp,
-                                 sizeof(iret_saved))) )
+    if ( unlikely(copy_from_guest_pv(&iret_saved, (void __user *)regs->rsp,
+                                     sizeof(iret_saved))) )
     {
         gprintk(XENLOG_ERR,
                 "Fault while reading IRET context from guest stack\n");
--- a/xen/arch/x86/pv/ro-page-fault.c
+++ b/xen/arch/x86/pv/ro-page-fault.c
@@ -90,7 +90,8 @@ static int ptwr_emulated_update(unsigned
 
         /* Align address; read full word. */
         addr &= ~(sizeof(full) - 1);
-        if ( (rc = copy_from_user(&full, (void *)addr, sizeof(full))) != 0 )
+        if ( (rc = copy_from_guest_pv(&full, (void __user *)addr,
+                                      sizeof(full))) != 0 )
         {
             x86_emul_pagefault(0, /* Read fault. */
                                addr + sizeof(full) - rc,
--- a/xen/arch/x86/usercopy.c
+++ b/xen/arch/x86/usercopy.c
@@ -109,19 +109,17 @@ unsigned int copy_from_guest_ll(void *to
 #if GUARD(1) + 0
 
 /**
- * copy_to_user: - Copy a block of data into user space.
- * @to:   Destination address, in user space.
- * @from: Source address, in kernel space.
+ * copy_to_guest_pv: - Copy a block of data into guest space.
+ * @to:   Destination address, in guest space.
+ * @from: Source address, in hypervisor space.
  * @n:    Number of bytes to copy.
  *
- * Context: User context only.  This function may sleep.
- *
- * Copy data from kernel space to user space.
+ * Copy data from hypervisor space to guest space.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
  */
-unsigned copy_to_user(void __user *to, const void *from, unsigned n)
+unsigned int copy_to_guest_pv(void __user *to, const void *from, unsigned int 
n)
 {
     if ( access_ok(to, n) )
         n = __copy_to_guest_pv(to, from, n);
@@ -129,16 +127,16 @@ unsigned copy_to_user(void __user *to, c
 }
 
 /**
- * clear_user: - Zero a block of memory in user space.
- * @to:   Destination address, in user space.
+ * clear_guest_pv: - Zero a block of memory in guest space.
+ * @to:   Destination address, in guest space.
  * @n:    Number of bytes to zero.
  *
- * Zero a block of memory in user space.
+ * Zero a block of memory in guest space.
  *
  * Returns number of bytes that could not be cleared.
  * On success, this will be zero.
  */
-unsigned clear_user(void __user *to, unsigned n)
+unsigned int clear_guest_pv(void __user *to, unsigned int n)
 {
     if ( access_ok(to, n) )
     {
@@ -168,14 +166,12 @@ unsigned clear_user(void __user *to, uns
 }
 
 /**
- * copy_from_user: - Copy a block of data from user space.
- * @to:   Destination address, in kernel space.
- * @from: Source address, in user space.
+ * copy_from_guest_pv: - Copy a block of data from guest space.
+ * @to:   Destination address, in hypervisor space.
+ * @from: Source address, in guest space.
  * @n:    Number of bytes to copy.
  *
- * Context: User context only.  This function may sleep.
- *
- * Copy data from user space to kernel space.
+ * Copy data from guest space to hypervisor space.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
@@ -183,7 +179,8 @@ unsigned clear_user(void __user *to, uns
  * If some data could not be copied, this function will pad the copied
  * data to the requested size using zero bytes.
  */
-unsigned copy_from_user(void *to, const void __user *from, unsigned n)
+unsigned int copy_from_guest_pv(void *to, const void __user *from,
+                                unsigned int n)
 {
     if ( access_ok(from, n) )
         n = __copy_from_guest_pv(to, from, n);
--- a/xen/include/asm-x86/guest_access.h
+++ b/xen/include/asm-x86/guest_access.h
@@ -16,15 +16,15 @@
 #define raw_copy_to_guest(dst, src, len)        \
     (is_hvm_vcpu(current) ?                     \
      copy_to_user_hvm((dst), (src), (len)) :    \
-     copy_to_user((dst), (src), (len)))
+     copy_to_guest_pv(dst, src, len))
 #define raw_copy_from_guest(dst, src, len)      \
     (is_hvm_vcpu(current) ?                     \
      copy_from_user_hvm((dst), (src), (len)) :  \
-     copy_from_user((dst), (src), (len)))
+     copy_from_guest_pv(dst, src, len))
 #define raw_clear_guest(dst,  len)              \
     (is_hvm_vcpu(current) ?                     \
      clear_user_hvm((dst), (len)) :             \
-     clear_user((dst), (len)))
+     clear_guest_pv(dst, len))
 #define __raw_copy_to_guest(dst, src, len)      \
     (is_hvm_vcpu(current) ?                     \
      copy_to_user_hvm((dst), (src), (len)) :    \
@@ -33,10 +33,6 @@
     (is_hvm_vcpu(current) ?                     \
      copy_from_user_hvm((dst), (src), (len)) :  \
      __copy_from_guest_pv(dst, src, len))
-#define __raw_clear_guest(dst,  len)            \
-    (is_hvm_vcpu(current) ?                     \
-     clear_user_hvm((dst), (len)) :             \
-     clear_user((dst), (len)))
 
 /*
  * Pre-validate a guest handle.
--- a/xen/include/asm-x86/uaccess.h
+++ b/xen/include/asm-x86/uaccess.h
@@ -9,9 +9,11 @@
 
 #include <asm/x86_64/uaccess.h>
 
-unsigned copy_to_user(void *to, const void *from, unsigned len);
-unsigned clear_user(void *to, unsigned len);
-unsigned copy_from_user(void *to, const void *from, unsigned len);
+unsigned int copy_to_guest_pv(void __user *to, const void *from,
+                              unsigned int len);
+unsigned int clear_guest_pv(void __user *to, unsigned int len);
+unsigned int copy_from_guest_pv(void *to, const void __user *from,
+                                unsigned int len);
 
 /* Handles exceptions in both to and from, but doesn't do access_ok */
 unsigned int copy_to_guest_ll(void __user*to, const void *from, unsigned int 
n);