[RFC PATCH V2 22/26] x86/vmsi: Hook delivering remapping format msi to guest

[Lan Tianyu <tianyu.lan@intel.com>]

From: Chao Gao <chao.gao@intel.com>

In two situations, hypervisor delivers a msi to a hvm guest. One is
when qemu sends a request to hypervisor through XEN_DMOP_inject_msi.
The other is when a physical interrupt arrives and it has been bound
to a guest msi.

For the former, the msi is routed to common vIOMMU layer if it is in
remapping format. For the latter, if the pt irq is bound to a guest
remapping msi, a new remapping msi is constructed based on the binding
information and routed to common vIOMMU layer.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
 xen/arch/x86/hvm/irq.c       | 11 ++++++++++
 xen/arch/x86/hvm/vmsi.c      | 14 ++++++++++--
 xen/drivers/passthrough/io.c | 52 +++++++++++++++++++++++++++++++++-----------
 xen/include/asm-x86/msi.h    |  3 +++
 4 files changed, 65 insertions(+), 15 deletions(-)

diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
index 8625584..abe2f77 100644
--- a/xen/arch/x86/hvm/irq.c
+++ b/xen/arch/x86/hvm/irq.c
@@ -26,6 +26,7 @@
 #include <asm/hvm/domain.h>
 #include <asm/hvm/support.h>
 #include <asm/msi.h>
+#include <asm/viommu.h>
 
 /* Must be called with hvm_domain->irq_lock hold */
 static void assert_gsi(struct domain *d, unsigned ioapic_gsi)
@@ -298,6 +299,16 @@ int hvm_inject_msi(struct domain *d, uint64_t addr, uint32_t data)
         >> MSI_DATA_TRIGGER_SHIFT;
     uint8_t vector = data & MSI_DATA_VECTOR_MASK;
 
+    if ( addr & MSI_ADDR_INTEFORMAT_MASK )
+    {
+        struct irq_remapping_request request;
+
+        irq_request_msi_fill(&request, 0, addr, data);
+        /* Currently, only viommu 0 is supported */
+        viommu_handle_irq_request(d, 0, &request);
+        return 0;
+    }
+
     if ( !vector )
     {
         int pirq = ((addr >> 32) & 0xffffff00) | dest;
diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index c4ec0ad..75ceb19 100644
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -114,9 +114,19 @@ void vmsi_deliver_pirq(struct domain *d, const struct hvm_pirq_dpci *pirq_dpci)
                 "vector=%x trig_mode=%x\n",
                 dest, dest_mode, delivery_mode, vector, trig_mode);
 
-    ASSERT(pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI);
+    ASSERT(pirq_dpci->flags & (HVM_IRQ_DPCI_GUEST_MSI | HVM_IRQ_DPCI_GUEST_MSI_IR));
+    if ( pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI_IR )
+    {
+        struct irq_remapping_request request;
 
-    vmsi_deliver(d, vector, dest, dest_mode, delivery_mode, trig_mode);
+        irq_request_msi_fill(&request, pirq_dpci->gmsi.intremap.source_id,
+                             pirq_dpci->gmsi.intremap.addr,
+                             pirq_dpci->gmsi.intremap.data);
+        /* Currently, only viommu 0 is supported */
+        viommu_handle_irq_request(d, 0, &request);
+    }
+    else
+        vmsi_deliver(d, vector, dest, dest_mode, delivery_mode, trig_mode);
 }
 
 /* Return value, -1 : multi-dests, non-negative value: dest_vcpu_id */
diff --git a/xen/drivers/passthrough/io.c b/xen/drivers/passthrough/io.c
index b4b6e9c..572e60d 100644
--- a/xen/drivers/passthrough/io.c
+++ b/xen/drivers/passthrough/io.c
@@ -139,7 +139,9 @@ static void pt_pirq_softirq_reset(struct hvm_pirq_dpci *pirq_dpci)
 
 bool_t pt_irq_need_timer(uint32_t flags)
 {
-    return !(flags & (HVM_IRQ_DPCI_GUEST_MSI | HVM_IRQ_DPCI_TRANSLATE));
+    return !(flags & (HVM_IRQ_DPCI_GUEST_MSI_IR |
+                      HVM_IRQ_DPCI_GUEST_MSI |
+                      HVM_IRQ_DPCI_TRANSLATE));
 }
 
 static int pt_irq_guest_eoi(struct domain *d, struct hvm_pirq_dpci *pirq_dpci,
@@ -659,7 +661,8 @@ int pt_irq_destroy_bind(
     pirq = pirq_info(d, machine_gsi);
     pirq_dpci = pirq_dpci(pirq);
 
-    if ( pt_irq_bind->irq_type != PT_IRQ_TYPE_MSI )
+    if ( (pt_irq_bind->irq_type != PT_IRQ_TYPE_MSI_IR) &&
+         (pt_irq_bind->irq_type != PT_IRQ_TYPE_MSI) )
     {
         unsigned int bus = pt_irq_bind->u.pci.bus;
         unsigned int device = pt_irq_bind->u.pci.device;
@@ -824,20 +827,41 @@ static int _hvm_dpci_msi_eoi(struct domain *d,
 {
     int vector = (long)arg;
 
-    if ( (pirq_dpci->flags & HVM_IRQ_DPCI_MACH_MSI) &&
-         (pirq_dpci->gmsi.legacy.gvec == vector) )
+    if ( pirq_dpci->flags & HVM_IRQ_DPCI_MACH_MSI )
     {
-        int dest = pirq_dpci->gmsi.legacy.gflags & VMSI_DEST_ID_MASK;
-        int dest_mode = !!(pirq_dpci->gmsi.legacy.gflags & VMSI_DM_MASK);
+        if ( (pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI) &&
+             (pirq_dpci->gmsi.legacy.gvec == vector) )
+        {
+            int dest = pirq_dpci->gmsi.legacy.gflags & VMSI_DEST_ID_MASK;
+            int dest_mode = !!(pirq_dpci->gmsi.legacy.gflags & VMSI_DM_MASK);
 
-        if ( vlapic_match_dest(vcpu_vlapic(current), NULL, 0, dest,
-                               dest_mode) )
+            if ( vlapic_match_dest(vcpu_vlapic(current), NULL, 0, dest,
+                                   dest_mode) )
+            {
+                __msi_pirq_eoi(pirq_dpci);
+                return 1;
+            }
+        }
+        else if ( pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI_IR )
         {
-            __msi_pirq_eoi(pirq_dpci);
-            return 1;
+            int ret;
+            struct irq_remapping_request request;
+            struct irq_remapping_info irq_info;
+
+            irq_request_msi_fill(&request, pirq_dpci->gmsi.intremap.source_id,
+                                 pirq_dpci->gmsi.intremap.addr,
+                                 pirq_dpci->gmsi.intremap.data);
+            /* Currently, only viommu 0 is supported */
+            ret = viommu_get_irq_info(d, 0, &request, &irq_info);
+            if ( (!ret) && (irq_info.vector == vector) &&
+                 vlapic_match_dest(vcpu_vlapic(current), NULL, 0,
+                                   irq_info.dest, irq_info.dest_mode) )
+            {
+                __msi_pirq_eoi(pirq_dpci);
+                return 1;
+            }
         }
     }
-
     return 0;
 }
 
@@ -869,14 +893,16 @@ static void hvm_dirq_assist(struct domain *d, struct hvm_pirq_dpci *pirq_dpci)
         {
             send_guest_pirq(d, pirq);
 
-            if ( pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI )
+            if ( pirq_dpci->flags
+                 & (HVM_IRQ_DPCI_GUEST_MSI | HVM_IRQ_DPCI_GUEST_MSI_IR) )
             {
                 spin_unlock(&d->event_lock);
                 return;
             }
         }
 
-        if ( pirq_dpci->flags & HVM_IRQ_DPCI_GUEST_MSI )
+        if ( pirq_dpci->flags
+             & (HVM_IRQ_DPCI_GUEST_MSI | HVM_IRQ_DPCI_GUEST_MSI_IR) )
         {
             vmsi_deliver_pirq(d, pirq_dpci);
             spin_unlock(&d->event_lock);
diff --git a/xen/include/asm-x86/msi.h b/xen/include/asm-x86/msi.h
index a5de6a1..c41e2a7 100644
--- a/xen/include/asm-x86/msi.h
+++ b/xen/include/asm-x86/msi.h
@@ -49,6 +49,9 @@
 #define MSI_ADDR_REDIRECTION_CPU    (0 << MSI_ADDR_REDIRECTION_SHIFT)
 #define MSI_ADDR_REDIRECTION_LOWPRI (1 << MSI_ADDR_REDIRECTION_SHIFT)
 
+#define MSI_ADDR_INTEFORMAT_SHIFT   4
+#define MSI_ADDR_INTEFORMAT_MASK    (1 << MSI_ADDR_INTEFORMAT_SHIFT)
+
 #define MSI_ADDR_DEST_ID_SHIFT		12
 #define	 MSI_ADDR_DEST_ID_MASK		0x00ff000
 #define  MSI_ADDR_DEST_ID(dest)		(((dest) << MSI_ADDR_DEST_ID_SHIFT) & MSI_ADDR_DEST_ID_MASK)
-- 
1.8.3.1


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