[Xen-devel] [PATCH V2 2/7]: PVH: use native irq, enable callback, use HVM ring ops, ...

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

PVH: make gdt_frames[]/gdt_ents into a union with {gdtaddr, gdtsz}, PVH
only needs to send down gdtaddr and gdtsz. irq.c: PVH uses
native_irq_ops. vcpu hotplug is currently not available for PVH.
events.c: setup callback vector for PVH. Finally, PVH ring ops uses HVM
paths for xenbus.

Signed-off-by: Mukesh R <mukesh.rathor@xxxxxxxxxx>
---
 arch/x86/include/asm/xen/interface.h |    8 +++++++-
 arch/x86/xen/irq.c                   |    5 ++++-
 arch/x86/xen/p2m.c                   |    2 +-
 arch/x86/xen/smp.c                   |    4 ++--
 drivers/xen/cpu_hotplug.c            |    4 +++-
 drivers/xen/events.c                 |    9 ++++++++-
 drivers/xen/xenbus/xenbus_client.c   |    3 ++-
 7 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/xen/interface.h 
b/arch/x86/include/asm/xen/interface.h
index 555f94d..f11edb0 100644
--- a/arch/x86/include/asm/xen/interface.h
+++ b/arch/x86/include/asm/xen/interface.h
@@ -143,7 +143,13 @@ 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;
+       } s;
+       unsigned long gdtaddr, gdtsz;       /* PVH: GDTR addr and size */
+    } u;
     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/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 95fb2aa..ea553c8 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -798,7 +798,7 @@ 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/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index f58dca7..bd92698 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -324,8 +324,8 @@ cpu_initialize_context(unsigned int cpu, struct task_struct 
*idle)
        make_lowmem_page_readonly(gdt);
        make_lowmem_page_readonly(mfn_to_virt(gdt_mfn));
 
-       ctxt->gdt_frames[0] = gdt_mfn;
-       ctxt->gdt_ents      = GDT_ENTRIES;
+       ctxt->u.s.gdt_frames[0] = gdt_mfn;
+       ctxt->u.s.gdt_ents      = GDT_ENTRIES;
 
        ctxt->user_regs.cs = __KERNEL_CS;
        ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
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 c60d162..a977612 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -1767,7 +1767,7 @@ int xen_set_callback_via(uint64_t via)
 }
 EXPORT_SYMBOL_GPL(xen_set_callback_via);
 
-#ifdef CONFIG_XEN_PVHVM
+#ifdef CONFIG_X86
 /* 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. */
@@ -1826,6 +1826,13 @@ 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..1bac743 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -44,6 +44,7 @@
 #include <xen/grant_table.h>
 #include <xen/xenbus.h>
 #include <xen/xen.h>
+#include <xen/features.h>
 
 #include "xenbus_probe.h"
 
@@ -743,7 +744,7 @@ 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;
-- 
1.7.2.3


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel