Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86/apic changes from Ingo Molnar:
 "Main changes:

   - Multiple MSI support added to the APIC, PCI and AHCI code - acked
     by all relevant maintainers, by Alexander Gordeev.

     The advantage is that multiple AHCI ports can have multiple MSI
     irqs assigned, and can thus spread to multiple CPUs.

     [ Drivers can make use of this new facility via the
       pci_enable_msi_block_auto() method ]

   - x86 IOAPIC code from interrupt remapping cleanups from Joerg
     Roedel:

     These patches move all interrupt remapping specific checks out of
     the x86 core code and replaces the respective call-sites with
     function pointers.  As a result the interrupt remapping code is
     better abstraced from x86 core interrupt handling code.

   - Various smaller improvements, fixes and cleanups."

* 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits)
  x86/intel/irq_remapping: Clean up x2apic opt-out security warning mess
  x86, kvm: Fix intialization warnings in kvm.c
  x86, irq: Move irq_remapped out of x86 core code
  x86, io_apic: Introduce eoi_ioapic_pin call-back
  x86, msi: Introduce x86_msi.compose_msi_msg call-back
  x86, irq: Introduce setup_remapped_irq()
  x86, irq: Move irq_remapped() check into free_remapped_irq
  x86, io-apic: Remove !irq_remapped() check from __target_IO_APIC_irq()
  x86, io-apic: Move CONFIG_IRQ_REMAP code out of x86 core
  x86, irq: Add data structure to keep AMD specific irq remapping information
  x86, irq: Move irq_remapping_enabled declaration to iommu code
  x86, io_apic: Remove irq_remapping_enabled check in setup_timer_IRQ0_pin
  x86, io_apic: Move irq_remapping_enabled checks out of check_timer()
  x86, io_apic: Convert setup_ioapic_entry to function pointer
  x86, io_apic: Introduce set_affinity function pointer
  x86, msi: Use IRQ remapping specific setup_msi_irqs routine
  x86, hpet: Introduce x86_msi_ops.setup_hpet_msi
  x86, io_apic: Introduce x86_io_apic_ops.print_entries for debugging
  x86, io_apic: Introduce x86_io_apic_ops.disable()
  x86, apic: Mask IO-APIC and PIC unconditionally on LAPIC resume
  ...

2 files changed, 20 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index a8f8fa9769d6..1e7e84a02eba 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -79,3 +79,10 @@ void __init init_hypervisor_platform(void)
 	if (x86_hyper->init_platform)
 		x86_hyper->init_platform();
 }
+
+bool __init hypervisor_x2apic_available(void)
+{
+	return x86_hyper                   &&
+	       x86_hyper->x2apic_available &&
+	       x86_hyper->x2apic_available();
+}
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index d22d0c4edcfd..03a36321ec54 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -33,6 +33,9 @@
 
 #define VMWARE_PORT_CMD_GETVERSION	10
 #define VMWARE_PORT_CMD_GETHZ		45
+#define VMWARE_PORT_CMD_GETVCPU_INFO	68
+#define VMWARE_PORT_CMD_LEGACY_X2APIC	3
+#define VMWARE_PORT_CMD_VCPU_RESERVED	31
 
 #define VMWARE_PORT(cmd, eax, ebx, ecx, edx)				\
 	__asm__("inl (%%dx)" :						\
@@ -125,10 +128,20 @@ static void __cpuinit vmware_set_cpu_features(struct cpuinfo_x86 *c)
 	set_cpu_cap(c, X86_FEATURE_TSC_RELIABLE);
 }
 
+/* Checks if hypervisor supports x2apic without VT-D interrupt remapping. */
+static bool __init vmware_legacy_x2apic_available(void)
+{
+	uint32_t eax, ebx, ecx, edx;
+	VMWARE_PORT(GETVCPU_INFO, eax, ebx, ecx, edx);
+	return (eax & (1 << VMWARE_PORT_CMD_VCPU_RESERVED)) == 0 &&
+	       (eax & (1 << VMWARE_PORT_CMD_LEGACY_X2APIC)) != 0;
+}
+
 const __refconst struct hypervisor_x86 x86_hyper_vmware = {
 	.name			= "VMware",
 	.detect			= vmware_platform,
 	.set_cpu_features	= vmware_set_cpu_features,
 	.init_platform		= vmware_platform_setup,
+	.x2apic_available	= vmware_legacy_x2apic_available,
 };
 EXPORT_SYMBOL(x86_hyper_vmware);