[Xen-devel] [PATCH v4 08/14] xen/x86: allow the emulated APICs to be enabled for the hardware domain

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

Allow the use of both the emulated local APIC and IO APIC for the hardware
domain.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
Changes since v3:
 - Don't enable the emulated PIT for PVHv2 Dom0.

Changes since v2:
 - Allow all PV guests to use the emulated PIT.

Changes since RFC:
 - Move the emulation flags check to a separate helper.
---
 xen/arch/x86/domain.c | 29 +++++++++++++++++++++++------
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index eae643f..2c7a528 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -509,6 +509,27 @@ void vcpu_destroy(struct vcpu *v)
         xfree(v->arch.pv_vcpu.trap_ctxt);
 }
 
+static bool emulation_flags_ok(const struct domain *d, uint32_t emflags)
+{
+
+    if ( is_hvm_domain(d) )
+    {
+        if ( is_hardware_domain(d) &&
+             emflags != (XEN_X86_EMU_LAPIC|XEN_X86_EMU_IOAPIC) )
+            return false;
+        if ( !is_hardware_domain(d) && emflags &&
+             emflags != XEN_X86_EMU_ALL && emflags != XEN_X86_EMU_LAPIC )
+            return false;
+    }
+    else if ( emflags != 0 && emflags != XEN_X86_EMU_PIT )
+    {
+        /* PV or classic PVH. */
+        return false;
+    }
+
+    return true;
+}
+
 int arch_domain_create(struct domain *d, unsigned int domcr_flags,
                        struct xen_arch_domainconfig *config)
 {
@@ -547,7 +568,7 @@ int arch_domain_create(struct domain *d, unsigned int 
domcr_flags,
     {
         uint32_t emflags;
 
-        if ( is_hardware_domain(d) )
+        if ( is_hardware_domain(d) && is_pv_domain(d) )
             config->emulation_flags |= XEN_X86_EMU_PIT;
 
         emflags = config->emulation_flags;
@@ -558,11 +579,7 @@ int arch_domain_create(struct domain *d, unsigned int 
domcr_flags,
             return -EINVAL;
         }
 
-        /* PVHv2 guests can request emulated APIC. */
-        if ( emflags &&
-            (is_hvm_domain(d) ? ((emflags != XEN_X86_EMU_ALL) &&
-                                 (emflags != XEN_X86_EMU_LAPIC)) :
-                                (emflags != XEN_X86_EMU_PIT)) )
+        if ( !emulation_flags_ok(d, emflags) )
         {
             printk(XENLOG_G_ERR "d%d: Xen does not allow %s domain creation "
                    "with the current selection of emulators: %#x\n",
-- 
2.9.3 (Apple Git-75)


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