[PATCH v3 07/11] pvh/ioreq: Install handlers for ACPI-related PVH IO accesses

[Boris Ostrovsky <boris.ostrovsky@oracle.com>]

PVH guests will have ACPI accesses emulated by the hypervisor
as opposed to QEMU (as is the case for HVM guests)

Support for IOREQ server emulation of CPU hotplug is indicated
by XEN_X86_EMU_IOREQ_CPUHP flag.

Logic for the handler will be provided by a later patch.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
CC: Paul Durrant <paul.durrant@citrix.com>
---
Changes in v3:
* acpi_ioaccess() returns X86EMUL_UNHANDLEABLE
* Renamed XEN_X86_EMU_IOREQ_CPUHP to XEN_X86_EMU_ACPI_FF (together
  with corresponding has_*())

 xen/arch/x86/hvm/ioreq.c          | 18 ++++++++++++++++++
 xen/include/asm-x86/domain.h      |  1 +
 xen/include/public/arch-x86/xen.h |  4 +++-
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/ioreq.c b/xen/arch/x86/hvm/ioreq.c
index d2245e2..51bb399 100644
--- a/xen/arch/x86/hvm/ioreq.c
+++ b/xen/arch/x86/hvm/ioreq.c
@@ -1380,6 +1380,12 @@ static int hvm_access_cf8(
     return X86EMUL_UNHANDLEABLE;
 }
 
+static int acpi_ioaccess(
+    int dir, unsigned int port, unsigned int bytes, uint32_t *val)
+{
+    return X86EMUL_UNHANDLEABLE;
+}
+
 void hvm_ioreq_init(struct domain *d)
 {
     spin_lock_init(&d->arch.hvm_domain.ioreq_server.lock);
@@ -1387,6 +1393,18 @@ void hvm_ioreq_init(struct domain *d)
 
     if ( !is_pvh_domain(d) )
         register_portio_handler(d, 0xcf8, 4, hvm_access_cf8);
+
+    if ( !has_acpi_ff(d) )
+    {
+        /* Online CPU map, see DSDT's PRST region. */
+        register_portio_handler(d, XEN_ACPI_CPU_MAP,
+                                XEN_ACPI_CPU_MAP_LEN, acpi_ioaccess);
+
+        register_portio_handler(d, ACPI_GPE0_BLK_ADDRESS_V1,
+                                ACPI_GPE0_BLK_LEN_V1, acpi_ioaccess);
+        register_portio_handler(d, ACPI_PM1A_EVT_BLK_ADDRESS_V1,
+                                ACPI_PM1A_EVT_BLK_LEN, acpi_ioaccess);
+    }
 }
 
 /*
diff --git a/xen/include/asm-x86/domain.h b/xen/include/asm-x86/domain.h
index f6a40eb..33f862f 100644
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -425,6 +425,7 @@ struct arch_domain
 #define has_vvga(d)        (!!((d)->arch.emulation_flags & XEN_X86_EMU_VGA))
 #define has_viommu(d)      (!!((d)->arch.emulation_flags & XEN_X86_EMU_IOMMU))
 #define has_vpit(d)        (!!((d)->arch.emulation_flags & XEN_X86_EMU_PIT))
+#define has_acpi_ff(d)     (!!((d)->arch.emulation_flags & XEN_X86_EMU_ACPI_FF))
 
 #define has_arch_pdevs(d)    (!list_empty(&(d)->arch.pdev_list))
 
diff --git a/xen/include/public/arch-x86/xen.h b/xen/include/public/arch-x86/xen.h
index cdd93c1..04c78ec 100644
--- a/xen/include/public/arch-x86/xen.h
+++ b/xen/include/public/arch-x86/xen.h
@@ -283,12 +283,14 @@ struct xen_arch_domainconfig {
 #define XEN_X86_EMU_IOMMU           (1U<<_XEN_X86_EMU_IOMMU)
 #define _XEN_X86_EMU_PIT            8
 #define XEN_X86_EMU_PIT             (1U<<_XEN_X86_EMU_PIT)
+#define _XEN_X86_EMU_ACPI_FF        9
+#define XEN_X86_EMU_ACPI_FF         (1U<<_XEN_X86_EMU_ACPI_FF)
 
 #define XEN_X86_EMU_ALL             (XEN_X86_EMU_LAPIC | XEN_X86_EMU_HPET |  \
                                      XEN_X86_EMU_PM | XEN_X86_EMU_RTC |      \
                                      XEN_X86_EMU_IOAPIC | XEN_X86_EMU_PIC |  \
                                      XEN_X86_EMU_VGA | XEN_X86_EMU_IOMMU |   \
-                                     XEN_X86_EMU_PIT)
+                                     XEN_X86_EMU_PIT | XEN_X86_EMU_ACPI_FF)
     uint32_t emulation_flags;
 };
 #endif
-- 
2.7.4


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