[PATCH 5/6] xen/x86/pvh: Add 32-bit PVH initialization code

[Boris Ostrovsky]

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |  4 ----
 arch/x86/xen/smp.c       | 17 ++++++++++-------
 arch/x86/xen/xen-head.S  | 17 +++++++++++++++--
 3 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 7953e68..807337e 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1464,10 +1464,6 @@ static void __init xen_pvh_early_guest_init(void)
 
 	xen_pvh_early_cpu_init(0, false);
 	xen_pvh_set_cr_flags(0);
-
-#ifdef CONFIG_X86_32
-	BUG(); /* PVH: Implement proper support. */
-#endif
 }
 #endif    /* CONFIG_XEN_PVH */
 
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7cf0765..99be53b 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -372,11 +372,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 
 	gdt = get_cpu_gdt_table(cpu);
 
-#ifdef CONFIG_X86_32
-	/* Note: PVH is not yet supported on x86_32. */
-	ctxt->user_regs.fs = __KERNEL_PERCPU;
-	ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
-#endif
+	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
+	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
 
 	if (!xen_feature(XENFEAT_auto_translated_physmap)) {
 		ctxt->user_regs.eip = (unsigned long)cpu_bringup_and_idle;
@@ -403,6 +400,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 		ctxt->kernel_sp = idle->thread.sp0;
 
 #ifdef CONFIG_X86_32
+		ctxt->user_regs.fs = __KERNEL_PERCPU;
+		ctxt->user_regs.gs = __KERNEL_STACK_CANARY;
 		ctxt->event_callback_cs     = __KERNEL_CS;
 		ctxt->failsafe_callback_cs  = __KERNEL_CS;
 #else
@@ -424,12 +423,16 @@ cpu_initialize_context(unsigned int cpu, struct task_struct *idle)
 		 */
 		ctxt->user_regs.eip =
 			(unsigned long)xen_pvh_early_cpu_init_secondary;
+#ifdef CONFIG_X86_64
 		ctxt->user_regs.rdi = cpu;
 		ctxt->user_regs.rsi = true;  /* entry == true */
+#else
+		*((uint32_t *)ctxt->user_regs.esp + 1) = cpu;
+		*((uint32_t *)ctxt->user_regs.esp + 2) = true;
+#endif
 	}
 #endif
-	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
-	ctxt->ctrlreg[3] = xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
+
 	if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt))
 		BUG();
 
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index b1508a8..12c4e2a 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -51,14 +51,18 @@ ENTRY(startup_xen)
 
 #ifdef CONFIG_XEN_PVH
 /*
- * xen_pvh_early_cpu_init() - early PVH VCPU initialization
+ * xen_pvh_early_cpu_init(cpu, entry) - early PVH VCPU initialization
  * @cpu:   this cpu number (%rdi)
  * @entry: true if this is a secondary vcpu coming up on this entry
  *         point, false if this is the boot CPU being initialized for
  *         the first time (%rsi)
  */
 ENTRY(xen_pvh_early_cpu_init)
+#ifdef CONFIG_X86_64
 	mov	%rbx, -8(%rsp)
+#else
+	mov	%ebx, -4(%esp)
+#endif
 
 /* Entry point for secondary CPUs */
 ENTRY(xen_pvh_early_cpu_init_secondary)
@@ -69,15 +73,24 @@ ENTRY(xen_pvh_early_cpu_init_secondary)
 
 	mov     $MSR_EFER, %ecx
 	rdmsr
+#ifdef CONFIG_X86_64
 	bts     $_EFER_SCE, %eax
+#endif
 
 	bt      $20, %ebx
 	jnc     1f      	/* No NX, skip setting it */
 	bts     $_EFER_NX, %eax
 1:	wrmsr
+
+#ifdef CONFIG_X86_64
 	mov	-8(%rsp), %rbx
-#ifdef CONFIG_SMP
 	cmp     $0, %esi
+#else
+	mov	-4(%esp), %ebx
+	cmp	$0, 8(%esp)	/* second argument */
+#endif
+
+#ifdef CONFIG_SMP
 	jne     cpu_bringup_and_idle
 #endif
 	ret
-- 
1.8.1.4

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