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>

4 files changed, 11 insertions, 12 deletions

diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c
index 6bbfce4e5987..9ac7455ec7fb 100644
--- a/drivers/lguest/interrupts_and_traps.c
+++ b/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))
diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h
index f1c4c33e4153..0d6f6435d72c 100644
--- a/drivers/lguest/lg.h
+++ b/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;
diff --git a/drivers/lguest/segments.c b/drivers/lguest/segments.c
index 02138450ecf5..635f54c719ae 100644
--- a/drivers/lguest/segments.c
+++ b/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;
 }
 /*:*/
 
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index f8dfdc9a3e5b..fd6a8512443c 100644
--- a/drivers/lguest/x86/core.c
+++ b/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. */