x86/vsmp: Remove dependency on pv_irq_ops

vSMP dependency on pv_irq_ops has been removed some years ago, but the code
still deals with pv_irq_ops.

In short, "cap & ctl & (1 << 4)" is always returning 0, so all
PARAVIRT/PARAVIRT_XXL code related to that can be removed.

However, the rest of the code depends on CONFIG_PCI, so fix it accordingly.

Rename set_vsmp_pv_ops to set_vsmp_ctl as the original name does not make
sense anymore.

Signed-off-by: Eial Czerwacki <eial@scalemp.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Shai Fultheim <shai@scalemp.com>
Cc: Juergen Gross <jgross@suse.com>
Link: https://lkml.kernel.org/r/1541439114-28297-1-git-send-email-eial@scalemp.com

2 files changed, 7 insertions, 78 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ba7e3464ee92..9d734f3c8234 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -525,7 +525,6 @@ config X86_VSMP
         bool "ScaleMP vSMP"
         select HYPERVISOR_GUEST
         select PARAVIRT
-        select PARAVIRT_XXL
         depends on X86_64 && PCI
         depends on X86_EXTENDED_PLATFORM
         depends on SMP
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 1eae5af491c2..891a75dbc131 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -26,65 +26,8 @@
 
 #define TOPOLOGY_REGISTER_OFFSET 0x10
 
-#if defined CONFIG_PCI && defined CONFIG_PARAVIRT_XXL
-/*
- * Interrupt control on vSMPowered systems:
- * ~AC is a shadow of IF.  If IF is 'on' AC should be 'off'
- * and vice versa.
- */
-
-asmlinkage __visible unsigned long vsmp_save_fl(void)
-{
-        unsigned long flags = native_save_fl();
-
-        if (!(flags & X86_EFLAGS_IF) || (flags & X86_EFLAGS_AC))
-                flags &= ~X86_EFLAGS_IF;
-        return flags;
-}
-PV_CALLEE_SAVE_REGS_THUNK(vsmp_save_fl);
-
-__visible void vsmp_restore_fl(unsigned long flags)
-{
-        if (flags & X86_EFLAGS_IF)
-                flags &= ~X86_EFLAGS_AC;
-        else
-                flags |= X86_EFLAGS_AC;
-        native_restore_fl(flags);
-}
-PV_CALLEE_SAVE_REGS_THUNK(vsmp_restore_fl);
-
-asmlinkage __visible void vsmp_irq_disable(void)
-{
-        unsigned long flags = native_save_fl();
-
-        native_restore_fl((flags & ~X86_EFLAGS_IF) | X86_EFLAGS_AC);
-}
-PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_disable);
-
-asmlinkage __visible void vsmp_irq_enable(void)
-{
-        unsigned long flags = native_save_fl();
-
-        native_restore_fl((flags | X86_EFLAGS_IF) & (~X86_EFLAGS_AC));
-}
-PV_CALLEE_SAVE_REGS_THUNK(vsmp_irq_enable);
-
-static unsigned __init vsmp_patch(u8 type, void *ibuf,
-                                  unsigned long addr, unsigned len)
-{
-        switch (type) {
-        case PARAVIRT_PATCH(irq.irq_enable):
-        case PARAVIRT_PATCH(irq.irq_disable):
-        case PARAVIRT_PATCH(irq.save_fl):
-        case PARAVIRT_PATCH(irq.restore_fl):
-                return paravirt_patch_default(type, ibuf, addr, len);
-        default:
-                return native_patch(type, ibuf, addr, len);
-        }
-
-}
-
-static void __init set_vsmp_pv_ops(void)
+#ifdef CONFIG_PCI
+static void __init set_vsmp_ctl(void)
 {
         void __iomem *address;
         unsigned int cap, ctl, cfg;
@@ -109,28 +52,12 @@ static void __init set_vsmp_pv_ops(void)
         }
 #endif
 
-        if (cap & ctl & (1 << 4)) {
-                /* Setup irq ops and turn on vSMP  IRQ fastpath handling */
-                pv_ops.irq.irq_disable = PV_CALLEE_SAVE(vsmp_irq_disable);
-                pv_ops.irq.irq_enable = PV_CALLEE_SAVE(vsmp_irq_enable);
-                pv_ops.irq.save_fl = PV_CALLEE_SAVE(vsmp_save_fl);
-                pv_ops.irq.restore_fl = PV_CALLEE_SAVE(vsmp_restore_fl);
-                pv_ops.init.patch = vsmp_patch;
-                ctl &= ~(1 << 4);
-        }
         writel(ctl, address + 4);
         ctl = readl(address + 4);
         pr_info("vSMP CTL: control set to:0x%08x\n", ctl);
 
         early_iounmap(address, 8);
 }
-#else
-static void __init set_vsmp_pv_ops(void)
-{
-}
-#endif
-
-#ifdef CONFIG_PCI
 static int is_vsmp = -1;
 
 static void __init detect_vsmp_box(void)
@@ -164,11 +91,14 @@ static int is_vsmp_box(void)
 {
         return 0;
 }
+static void __init set_vsmp_ctl(void)
+{
+}
 #endif
 
 static void __init vsmp_cap_cpus(void)
 {
-#if !defined(CONFIG_X86_VSMP) && defined(CONFIG_SMP)
+#if !defined(CONFIG_X86_VSMP) && defined(CONFIG_SMP) && defined(CONFIG_PCI)
         void __iomem *address;
         unsigned int cfg, topology, node_shift, maxcpus;
 
@@ -221,6 +151,6 @@ void __init vsmp_init(void)
 
         vsmp_cap_cpus();
 
-        set_vsmp_pv_ops();
+        set_vsmp_ctl();
         return;
 }