[Xen-devel] [PATCH 6/18 V2]: PVH xen: Introduce PVH guest type

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

This patch introduces the concept of pvh guest. There also other basic
changes like creating macros to check for pvh vcpu/domain, and creating
new macros to see if it's pvh/hvm domain/vcpu. Also, modify copy macros
to test for pvh. Lastly, we introduce that PVH uses HVM style event
delivery.

Chagnes in V2:
  - make is_pvh/is_hvm enum instead of adding is_pvh as a new flag.
  - fix indentation and spacing in guest_kernel_mode macro.
  - add debug only BUG() in GUEST_KERNEL_RPL macro as it should no longer
    be called in any PVH paths.

Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
---
 xen/arch/x86/debug.c               |    2 +-
 xen/arch/x86/domain.c              |    7 +++++++
 xen/common/domain.c                |    2 +-
 xen/include/asm-x86/desc.h         |    5 +++++
 xen/include/asm-x86/domain.h       |    9 ++++-----
 xen/include/asm-x86/event.h        |    2 +-
 xen/include/asm-x86/guest_access.h |   12 ++++++------
 xen/include/asm-x86/x86_64/regs.h  |    9 +++++----
 xen/include/xen/sched.h            |   17 ++++++++++++++---
 9 files changed, 44 insertions(+), 21 deletions(-)

diff --git a/xen/arch/x86/debug.c b/xen/arch/x86/debug.c
index e67473e..502edbc 100644
--- a/xen/arch/x86/debug.c
+++ b/xen/arch/x86/debug.c
@@ -158,7 +158,7 @@ dbg_rw_guest_mem(dbgva_t addr, dbgbyte_t *buf, int len, 
struct domain *dp,
 
         pagecnt = min_t(long, PAGE_SIZE - (addr & ~PAGE_MASK), len);
 
-        mfn = (dp->is_hvm
+        mfn = (is_hvm_domain(dp)
                ? dbg_hvm_va2mfn(addr, dp, toaddr, &gfn)
                : dbg_pv_va2mfn(addr, dp, pgd3));
         if ( mfn == INVALID_MFN ) 
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index e9549e0..768c19d 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -649,6 +649,13 @@ int arch_set_info_guest(
     unsigned int i;
     int rc = 0, compat;
 
+    /* This removed when all patches are checked in */
+    if ( is_pvh_vcpu(v) )
+    {
+        printk("PVH: You don't have the correct xen version for PVH\n");
+        return -EINVAL;
+    }
+
     /* The context is a compat-mode one if the target domain is compat-mode;
      * we expect the tools to DTRT even in compat-mode callers. */
     compat = is_pv_32on64_domain(d);
diff --git a/xen/common/domain.c b/xen/common/domain.c
index 64ee29d..b6f10b7 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -231,7 +231,7 @@ struct domain *domain_create(
         goto fail;
 
     if ( domcr_flags & DOMCRF_hvm )
-        d->is_hvm = 1;
+        d->guest_type = hvm_guest;
 
     if ( domid == 0 )
     {
diff --git a/xen/include/asm-x86/desc.h b/xen/include/asm-x86/desc.h
index 354b889..4dca0a3 100644
--- a/xen/include/asm-x86/desc.h
+++ b/xen/include/asm-x86/desc.h
@@ -38,7 +38,12 @@
 
 #ifndef __ASSEMBLY__
 
+#ifndef NDEBUG
+#define GUEST_KERNEL_RPL(d) (is_pvh_domain(d) ? ({ BUG(); 0; }) :    \
+                                                is_pv_32bit_domain(d) ? 1 : 3)
+#else
 #define GUEST_KERNEL_RPL(d) (is_pv_32bit_domain(d) ? 1 : 3)
+#endif
 
 /* Fix up the RPL of a guest segment selector. */
 #define __fixup_guest_selector(d, sel)                             \
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index 97e09ca..ecb3058 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -16,7 +16,7 @@
 #define is_pv_32on64_domain(d) (is_pv_32bit_domain(d))
 #define is_pv_32on64_vcpu(v)   (is_pv_32on64_domain((v)->domain))
 
-#define is_hvm_pv_evtchn_domain(d) (is_hvm_domain(d) && \
+#define is_hvm_pv_evtchn_domain(d) (is_hvm_or_pvh_domain(d) && \
         d->arch.hvm_domain.irq.callback_via_type == HVMIRQ_callback_vector)
 #define is_hvm_pv_evtchn_vcpu(v) (is_hvm_pv_evtchn_domain(v->domain))
 
@@ -254,10 +254,9 @@ struct arch_domain
 
     struct list_head pdev_list;
 
-    union {
-        struct pv_domain pv_domain;
-        struct hvm_domain hvm_domain;
-    };
+    /* PVH : pvh uses fields from both pv and hvm, so separate the union */
+    struct pv_domain pv_domain;
+    struct hvm_domain hvm_domain;
 
     struct paging_domain paging;
     struct p2m_domain *p2m;
diff --git a/xen/include/asm-x86/event.h b/xen/include/asm-x86/event.h
index 06057c7..9187606 100644
--- a/xen/include/asm-x86/event.h
+++ b/xen/include/asm-x86/event.h
@@ -18,7 +18,7 @@ int hvm_local_events_need_delivery(struct vcpu *v);
 static inline int local_events_need_delivery(void)
 {
     struct vcpu *v = current;
-    return (is_hvm_vcpu(v) ? hvm_local_events_need_delivery(v) :
+    return (is_hvm_or_pvh_vcpu(v) ? hvm_local_events_need_delivery(v) :
             (vcpu_info(v, evtchn_upcall_pending) &&
              !vcpu_info(v, evtchn_upcall_mask)));
 }
diff --git a/xen/include/asm-x86/guest_access.h 
b/xen/include/asm-x86/guest_access.h
index ca700c9..1839fa4 100644
--- a/xen/include/asm-x86/guest_access.h
+++ b/xen/include/asm-x86/guest_access.h
@@ -14,27 +14,27 @@
 
 /* Raw access functions: no type checking. */
 #define raw_copy_to_guest(dst, src, len)        \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      copy_to_user_hvm((dst), (src), (len)) :    \
      copy_to_user((dst), (src), (len)))
 #define raw_copy_from_guest(dst, src, len)      \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      copy_from_user_hvm((dst), (src), (len)) :  \
      copy_from_user((dst), (src), (len)))
 #define raw_clear_guest(dst,  len)              \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      clear_user_hvm((dst), (len)) :             \
      clear_user((dst), (len)))
 #define __raw_copy_to_guest(dst, src, len)      \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      copy_to_user_hvm((dst), (src), (len)) :    \
      __copy_to_user((dst), (src), (len)))
 #define __raw_copy_from_guest(dst, src, len)    \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      copy_from_user_hvm((dst), (src), (len)) :  \
      __copy_from_user((dst), (src), (len)))
 #define __raw_clear_guest(dst,  len)            \
-    (is_hvm_vcpu(current) ?                     \
+    (is_hvm_or_pvh_vcpu(current) ?              \
      clear_user_hvm((dst), (len)) :             \
      clear_user((dst), (len)))
 
diff --git a/xen/include/asm-x86/x86_64/regs.h 
b/xen/include/asm-x86/x86_64/regs.h
index 3cdc702..bb475cf 100644
--- a/xen/include/asm-x86/x86_64/regs.h
+++ b/xen/include/asm-x86/x86_64/regs.h
@@ -10,10 +10,11 @@
 #define ring_2(r)    (((r)->cs & 3) == 2)
 #define ring_3(r)    (((r)->cs & 3) == 3)
 
-#define guest_kernel_mode(v, r)                                 \
-    (!is_pv_32bit_vcpu(v) ?                                     \
-     (ring_3(r) && ((v)->arch.flags & TF_kernel_mode)) :        \
-     (ring_1(r)))
+#define guest_kernel_mode(v, r)                                   \
+    (is_pvh_vcpu(v) ? ({ ASSERT(v == current); ring_0(r); }) :    \
+     (!is_pv_32bit_vcpu(v) ?                                      \
+      (ring_3(r) && ((v)->arch.flags & TF_kernel_mode)) :         \
+      (ring_1(r))))
 
 #define permit_softint(dpl, v, r) \
     ((dpl) >= (guest_kernel_mode(v, r) ? 1 : 3))
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 569e76e..079daff 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -230,6 +230,9 @@ struct mem_event_per_domain
     struct mem_event_domain access;
 };
 
+/* PVH is a PV guest running in HVM container. While is_hvm is false for it, 
+ * it uses many of the HVM data structs.
+ */
 struct domain
 {
     domid_t          domain_id;
@@ -277,8 +280,8 @@ struct domain
     struct rangeset *iomem_caps;
     struct rangeset *irq_caps;
 
-    /* Is this an HVM guest? */
-    bool_t           is_hvm;
+    /* !is_pvh && !is_hvm ==> PV, else PVH or HVM */
+    enum {hvm_guest=1, pvh_guest} guest_type;
 #ifdef HAS_PASSTHROUGH
     /* Does this guest need iommu mappings? */
     bool_t           need_iommu;
@@ -450,6 +453,10 @@ struct domain *domain_create(
  /* DOMCRF_oos_off: dont use out-of-sync optimization for shadow page tables */
 #define _DOMCRF_oos_off         4
 #define DOMCRF_oos_off          (1U<<_DOMCRF_oos_off)
+ /* DOMCRF_pvh: Create PV domain in HVM container */
+#define _DOMCRF_pvh            5
+#define DOMCRF_pvh             (1U<<_DOMCRF_pvh)
+
 
 /*
  * rcu_lock_domain_by_id() is more efficient than get_domain_by_id().
@@ -718,10 +725,14 @@ void watchdog_domain_destroy(struct domain *d);
 
 #define VM_ASSIST(_d,_t) (test_bit((_t), &(_d)->vm_assist))
 
-#define is_hvm_domain(d) ((d)->is_hvm)
+#define is_hvm_domain(d) ((d)->guest_type == hvm_guest)
 #define is_hvm_vcpu(v)   (is_hvm_domain(v->domain))
+#define is_pvh_domain(d) ((d)->guest_type == pvh_guest)
+#define is_pvh_vcpu(v)   (is_pvh_domain(v->domain))
 #define is_pinned_vcpu(v) ((v)->domain->is_pinned || \
                            cpumask_weight((v)->cpu_affinity) == 1)
+#define is_hvm_or_pvh_domain(d) (is_hvm_domain(d) || is_pvh_domain(d))
+#define is_hvm_or_pvh_vcpu(v) (is_hvm_or_pvh_domain(v->domain))
 #ifdef HAS_PASSTHROUGH
 #define need_iommu(d)    ((d)->need_iommu)
 #else
-- 
1.7.2.3


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