[PATCH] i386: Allow a kernel not to be in ring 0

We allow for the fact that the guest kernel may not run in ring 0.  This
requires some abstraction in a few places when setting %cs or checking
privilege level (user vs kernel).

This is Chris' [RFC PATCH 15/33] move segment checks to subarch, except rather
than using #define USER_MODE_MASK which depends on a config option, we use
Zach's more flexible approach of assuming ring 3 == userspace.  I also used
"get_kernel_rpl()" over "get_kernel_cs()" because I think it reads better in
the code...

1) Remove the hardcoded 3 and introduce #define SEGMENT_RPL_MASK 3 2) Add a
get_kernel_rpl() macro, and don't assume it's zero.

And:

Clean up of patch for letting kernel run other than ring 0:

a. Add some comments about the SEGMENT_IS_*_CODE() macros.
b. Add a USER_RPL macro.  (Code was comparing a value to a mask
   in some places and to the magic number 3 in other places.)
c. Add macros for table indicator field and use them.
d. Change the entry.S tests for LDT stack segment to use the macros

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Zachary Amsden <zach@vmware.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Andi Kleen <ak@suse.de>

4 files changed, 11 insertions, 13 deletions

diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index 3872fca5c74a..284f2e908ad0 100644
--- a/arch/i386/kernel/entry.S
+++ b/arch/i386/kernel/entry.S
@@ -240,8 +240,9 @@ ret_from_intr:
 check_userspace:
         movl EFLAGS(%esp), %eax         # mix EFLAGS and CS
         movb CS(%esp), %al
-        testl $(VM_MASK | 3), %eax
-        jz resume_kernel
+        andl $(VM_MASK | SEGMENT_RPL_MASK), %eax
+        cmpl $USER_RPL, %eax
+        jb resume_kernel                # not returning to v8086 or userspace
 ENTRY(resume_userspace)
         DISABLE_INTERRUPTS              # make sure we don't miss an interrupt
                                         # setting need_resched or sigpending
@@ -377,8 +378,8 @@ restore_all:
         # See comments in process.c:copy_thread() for details.
         movb OLDSS(%esp), %ah
         movb CS(%esp), %al
-        andl $(VM_MASK | (4 << 8) | 3), %eax
-        cmpl $((4 << 8) | 3), %eax
+        andl $(VM_MASK | (SEGMENT_TI_MASK << 8) | SEGMENT_RPL_MASK), %eax
+        cmpl $((SEGMENT_LDT << 8) | USER_RPL), %eax
         CFI_REMEMBER_STATE
         je ldt_ss                       # returning to user-space with LDT SS
 restore_nocheck:
diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 220aeca59c3a..8c190ca7ae44 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -338,7 +338,7 @@ int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
         regs.xes = __USER_DS;
         regs.orig_eax = -1;
         regs.eip = (unsigned long) kernel_thread_helper;
-        regs.xcs = __KERNEL_CS;
+        regs.xcs = __KERNEL_CS | get_kernel_rpl();
         regs.eflags = X86_EFLAGS_IF | X86_EFLAGS_SF | X86_EFLAGS_PF | 0x2;
 
         /* Ok, create the new process.. */
diff --git a/arch/i386/mm/extable.c b/arch/i386/mm/extable.c
index de03c5430abc..0ce4f22a2635 100644
--- a/arch/i386/mm/extable.c
+++ b/arch/i386/mm/extable.c
@@ -11,7 +11,7 @@ int fixup_exception(struct pt_regs *regs)
         const struct exception_table_entry *fixup;
 
 #ifdef CONFIG_PNPBIOS
-        if (unlikely((regs->xcs & ~15) == (GDT_ENTRY_PNPBIOS_BASE << 3)))
+        if (unlikely(SEGMENT_IS_PNP_CODE(regs->xcs)))
         {
                 extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
                 extern u32 pnp_bios_is_utter_crap;
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c
index 0ce86168a0b1..5e17a3f43b41 100644
--- a/arch/i386/mm/fault.c
+++ b/arch/i386/mm/fault.c
@@ -27,6 +27,7 @@
 #include <asm/uaccess.h>
 #include <asm/desc.h>
 #include <asm/kdebug.h>
+#include <asm/segment.h>
 
 extern void die(const char *,struct pt_regs *,long);
 
@@ -113,10 +114,10 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs,
         }
 
         /* The standard kernel/user address space limit. */
-        *eip_limit = (seg & 3) ? USER_DS.seg : KERNEL_DS.seg;
+        *eip_limit = user_mode(regs) ? USER_DS.seg : KERNEL_DS.seg;
         
         /* By far the most common cases. */
-        if (likely(seg == __USER_CS || seg == __KERNEL_CS))
+        if (likely(SEGMENT_IS_FLAT_CODE(seg)))
                 return eip;
 
         /* Check the segment exists, is within the current LDT/GDT size,
@@ -430,11 +431,7 @@ good_area:
         write = 0;
         switch (error_code & 3) {
                 default:        /* 3: write, present */
-#ifdef TEST_VERIFY_AREA
-                        if (regs->cs == KERNEL_CS)
-                                printk("WP fault at %08lx\n", regs->eip);
-#endif
-                        /* fall through */
+                                /* fall through */
                 case 2:         /* write, not present */
                         if (!(vma->vm_flags & VM_WRITE))
                                 goto bad_area;