lguest: move changed bitmap to lg_cpu

events represented in the 'changed' bitmap are per-cpu, not per-guest.
move it to the lg_cpu structure
Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

drivers/lguest/interrupts_and_traps.c

@@ -395,7 +395,7 @@ void load_guest_idt_entry(struct lg_cpu *cpu, unsigned int num, u32 lo, u32 hi)
 
 	/* Mark the IDT as changed: next time the Guest runs we'll know we have
 	 * to copy this again. */
-	cpu->lg->changed |= CHANGED_IDT;
+	cpu->changed |= CHANGED_IDT;
 
 	/* Check that the Guest doesn't try to step outside the bounds. */
 	if (num >= ARRAY_SIZE(cpu->arch.idt))

drivers/lguest/lg.h

@@ -51,6 +51,9 @@ struct lg_cpu {
 	u32 esp1;
 	u8 ss1;
 
+	/* Bitmap of what has changed: see CHANGED_* above. */
+	int changed;
+
 	unsigned long pending_notify; /* pfn from LHCALL_NOTIFY */
 
 	/* At end of a page shared mapped over lguest_pages in guest.  */
@@ -92,9 +95,6 @@ struct lguest
 	void __user *mem_base;
 	unsigned long kernel_address;
 
-	/* Bitmap of what has changed: see CHANGED_* above. */
-	int changed;
-
 	struct pgdir pgdirs[4];
 
 	unsigned long noirq_start, noirq_end;

drivers/lguest/segments.c

@@ -159,7 +159,7 @@ void load_guest_gdt(struct lg_cpu *cpu, unsigned long table, u32 num)
 	fixup_gdt_table(cpu, 0, ARRAY_SIZE(cpu->arch.gdt));
 	/* Mark that the GDT changed so the core knows it has to copy it again,
 	 * even if the Guest is run on the same CPU. */
-	lg->changed |= CHANGED_GDT;
+	cpu->changed |= CHANGED_GDT;
 }
 
 /* This is the fast-track version for just changing the three TLS entries.
@@ -174,7 +174,7 @@ void guest_load_tls(struct lg_cpu *cpu, unsigned long gtls)
 	__lgread(lg, tls, gtls, sizeof(*tls)*GDT_ENTRY_TLS_ENTRIES);
 	fixup_gdt_table(cpu, GDT_ENTRY_TLS_MIN, GDT_ENTRY_TLS_MAX+1);
 	/* Note that just the TLS entries have changed. */
-	lg->changed |= CHANGED_GDT_TLS;
+	cpu->changed |= CHANGED_GDT_TLS;
 }
 /*:*/
 

drivers/lguest/x86/core.c

@@ -75,7 +75,6 @@ static DEFINE_PER_CPU(struct lg_cpu *, last_cpu);
  */
 static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)
 {
-	struct lguest *lg = cpu->lg;
 	/* Copying all this data can be quite expensive.  We usually run the
 	 * same Guest we ran last time (and that Guest hasn't run anywhere else
 	 * meanwhile).  If that's not the case, we pretend everything in the
@@ -83,7 +82,7 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)
 	if (__get_cpu_var(last_cpu) != cpu || cpu->last_pages != pages) {
 		__get_cpu_var(last_cpu) = cpu;
 		cpu->last_pages = pages;
-		lg->changed = CHANGED_ALL;
+		cpu->changed = CHANGED_ALL;
 	}
 
 	/* These copies are pretty cheap, so we do them unconditionally: */
@@ -99,18 +98,18 @@ static void copy_in_guest_info(struct lg_cpu *cpu, struct lguest_pages *pages)
 	pages->state.guest_tss.ss1 = cpu->ss1;
 
 	/* Copy direct-to-Guest trap entries. */
-	if (lg->changed & CHANGED_IDT)
+	if (cpu->changed & CHANGED_IDT)
 		copy_traps(cpu, pages->state.guest_idt, default_idt_entries);
 
 	/* Copy all GDT entries which the Guest can change. */
-	if (lg->changed & CHANGED_GDT)
+	if (cpu->changed & CHANGED_GDT)
 		copy_gdt(cpu, pages->state.guest_gdt);
 	/* If only the TLS entries have changed, copy them. */
-	else if (lg->changed & CHANGED_GDT_TLS)
+	else if (cpu->changed & CHANGED_GDT_TLS)
 		copy_gdt_tls(cpu, pages->state.guest_gdt);
 
 	/* Mark the Guest as unchanged for next time. */
-	lg->changed = 0;
+	cpu->changed = 0;
 }
 
 /* Finally: the code to actually call into the Switcher to run the Guest. */