[PATCH v1 1/8]: PVH basic and hader file changes

[Mukesh Rathor <mukesh.rathor@oracle.com>]

---
 arch/x86/include/asm/xen/interface.h |    8 +++++++-
 arch/x86/include/asm/xen/page.h      |    3 +++
 arch/x86/xen/irq.c                   |    5 ++++-
 arch/x86/xen/p2m.c                   |    2 +-
 drivers/xen/cpu_hotplug.c            |    4 +++-
 drivers/xen/events.c                 |   12 ++++++++----
 drivers/xen/xenbus/xenbus_client.c   |    2 +-
 drivers/xen/xenbus/xenbus_probe.c    |    6 +++++-
 include/xen/interface/memory.h       |   27 +++++++++++++++++++++++++++
 include/xen/interface/physdev.h      |   10 ++++++++++
 10 files changed, 69 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h
index cbf0c9d..1d22131 100644
--- a/arch/x86/include/asm/xen/interface.h
+++ b/arch/x86/include/asm/xen/interface.h
@@ -136,7 +136,13 @@ struct vcpu_guest_context {
     struct cpu_user_regs user_regs;         /* User-level CPU registers     */
     struct trap_info trap_ctxt[256];        /* Virtual IDT                  */
     unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) */
-    unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
+    union {
+	struct {
+		/* PV: GDT (machine frames, # ents).*/
+		unsigned long gdt_frames[16], gdt_ents;
+	};
+	unsigned long gdtaddr, gdtsz;	    /* PVH: GDTR addr and size */
+    };
     unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   */
     /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
     unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  */
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 93971e8..d1cfb96 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -158,6 +158,9 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine)
 static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
 {
 	unsigned long pfn = mfn_to_pfn(mfn);
+
+	if (xen_feature(XENFEAT_auto_translated_physmap))
+		return mfn;
 	if (get_phys_to_machine(pfn) != mfn)
 		return -1; /* force !pfn_valid() */
 	return pfn;
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 1573376..31959a7 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -5,6 +5,7 @@
 #include <xen/interface/xen.h>
 #include <xen/interface/sched.h>
 #include <xen/interface/vcpu.h>
+#include <xen/features.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -128,6 +129,8 @@ static const struct pv_irq_ops xen_irq_ops __initconst = {
 
 void __init xen_init_irq_ops(void)
 {
-	pv_irq_ops = xen_irq_ops;
+	/* For PVH we use default pv_irq_ops settings */
+	if (!xen_feature(XENFEAT_hvm_callback_vector))
+		pv_irq_ops = xen_irq_ops;
 	x86_init.irqs.intr_init = xen_init_IRQ;
 }
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 64effdc..a954f83 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -626,7 +626,7 @@ bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
 {
 	unsigned topidx, mididx, idx;
 
-	if (unlikely(xen_feature(XENFEAT_auto_translated_physmap))) {
+	if (xen_feature(XENFEAT_auto_translated_physmap)) {
 		BUG_ON(pfn != mfn && mfn != INVALID_P2M_ENTRY);
 		return true;
 	}
diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
index 4dcfced..de6bcf9 100644
--- a/drivers/xen/cpu_hotplug.c
+++ b/drivers/xen/cpu_hotplug.c
@@ -2,6 +2,7 @@
 
 #include <xen/xen.h>
 #include <xen/xenbus.h>
+#include <xen/features.h>
 
 #include <asm/xen/hypervisor.h>
 #include <asm/cpu.h>
@@ -100,7 +101,8 @@ static int __init setup_vcpu_hotplug_event(void)
 	static struct notifier_block xsn_cpu = {
 		.notifier_call = setup_cpu_watcher };
 
-	if (!xen_pv_domain())
+	/* PVH TBD/FIXME: future work */
+	if (!xen_pv_domain() || xen_feature(XENFEAT_auto_translated_physmap))
 		return -ENODEV;
 
 	register_xenstore_notifier(&xsn_cpu);
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 7595581..f656791 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1755,7 +1755,7 @@ int xen_set_callback_via(uint64_t via)
 }
 EXPORT_SYMBOL_GPL(xen_set_callback_via);
 
-#ifdef CONFIG_XEN_PVHVM
+
 /* Vector callbacks are better than PCI interrupts to receive event
  * channel notifications because we can receive vector callbacks on any
  * vcpu and we don't need PCI support or APIC interactions. */
@@ -1779,9 +1779,6 @@ void xen_callback_vector(void)
 			alloc_intr_gate(XEN_HVM_EVTCHN_CALLBACK, xen_hvm_callback_vector);
 	}
 }
-#else
-void xen_callback_vector(void) {}
-#endif
 
 void __init xen_init_IRQ(void)
 {
@@ -1814,6 +1811,13 @@ void __init xen_init_IRQ(void)
 		if (xen_initial_domain())
 			pci_xen_initial_domain();
 
+		if (xen_feature(XENFEAT_hvm_callback_vector)) {
+			xen_callback_vector();
+			return;
+		}
+
+		/* PVH: TBD/FIXME: debug and fix eio map to work with pvh */
+
 		pirq_eoi_map = (void *)__get_free_page(GFP_KERNEL|__GFP_ZERO);
 		eoi_gmfn.gmfn = virt_to_mfn(pirq_eoi_map);
 		rc = HYPERVISOR_physdev_op(PHYSDEVOP_pirq_eoi_gmfn_v2, &eoi_gmfn);
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index b3e146e..a81e66b 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -743,7 +743,7 @@ static const struct xenbus_ring_ops ring_ops_hvm = {
 
 void __init xenbus_ring_ops_init(void)
 {
-	if (xen_pv_domain())
+	if (xen_pv_domain() && !xen_feature(XENFEAT_auto_translated_physmap))
 		ring_ops = &ring_ops_pv;
 	else
 		ring_ops = &ring_ops_hvm;
diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index b793723..481dc72 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -749,7 +749,11 @@ static int __init xenbus_init(void)
 			if (err)
 				goto out_error;
 		}
-		xen_store_interface = mfn_to_virt(xen_store_mfn);
+                if (xen_feature(XENFEAT_auto_translated_physmap))
+			/* mfn is actually a pfn */
+			xen_store_interface = __va(xen_store_mfn<<PAGE_SHIFT);
+		else
+			xen_store_interface = mfn_to_virt(xen_store_mfn);
 	}
 
 	/* Initialize the interface to xenstore. */
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index eac3ce1..f150fa1c 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -163,11 +163,22 @@ struct xen_add_to_physmap {
     /* Which domain to change the mapping for. */
     domid_t domid;
 
+    union {
+        /* Number of pages to go through for gmfn_range */
+        uint16_t    size;
+	/* IFF XENMAPSPACE_gmfn_foreign */
+        domid_t foreign_domid;
+    } u;
     /* Source mapping space. */
 #define XENMAPSPACE_shared_info 0 /* shared info page */
 #define XENMAPSPACE_grant_table 1 /* grant table page */
+#define XENMAPSPACE_gmfn        2 /* GMFN */
+#define XENMAPSPACE_gmfn_range  3 /* GMFN range */
+#define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another guest */
     unsigned int space;
 
+#define XENMAPIDX_grant_table_status 0x80000000
+
     /* Index into source mapping space. */
     unsigned long idx;
 
@@ -234,4 +245,20 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_memory_map);
  * during a driver critical region.
  */
 extern spinlock_t xen_reservation_lock;
+
+/*
+ * Unmaps the page appearing at a particular GPFN from the specified guest's
+ * pseudophysical address space.
+ * arg == addr of xen_remove_from_physmap_t.
+ */
+#define XENMEM_remove_from_physmap      15
+struct xen_remove_from_physmap {
+    /* Which domain to change the mapping for. */
+    domid_t domid;
+
+    /* GPFN of the current mapping of the page. */
+    unsigned long     gpfn;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xen_remove_from_physmap);
+
 #endif /* __XEN_PUBLIC_MEMORY_H__ */
diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
index 9ce788d..80f792e 100644
--- a/include/xen/interface/physdev.h
+++ b/include/xen/interface/physdev.h
@@ -258,6 +258,16 @@ struct physdev_pci_device {
     uint8_t devfn;
 };
 
+#define PHYSDEVOP_pvh_map_iomem        29
+struct physdev_map_iomem {
+    /* IN */
+    uint64_t first_gfn;
+    uint64_t first_mfn;
+    uint32_t nr_mfns;
+    uint32_t add_mapping;        /* 1 == add mapping;  0 == unmap */
+
+};
+
 /*
  * Notify that some PIRQ-bound event channels have been unmasked.
  * ** This command is obsolete since interface version 0x00030202 and is **
-- 
1.7.2.3