[Qemu-devel] [PATCH v4 2/8] apic: add send_msi() to APICCommonClass

["Radim Krčmář" <rkrcmar@redhat.com>]

The MMIO based interface to APIC doesn't work well with MSIs that have
upper address bits set (remapped x2APIC MSIs).  A specialized interface
is a quick and dirty way to avoid the shortcoming.

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---
v4: r-b Igor
v2: change apic_send_msi() to accept MSIMessage [Igor]
---
 hw/i386/kvm/apic.c              | 19 +++++++++++++------
 hw/i386/xen/xen_apic.c          |  6 ++++++
 hw/intc/apic.c                  |  8 ++++++--
 include/hw/i386/apic_internal.h |  4 ++++
 4 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/hw/i386/kvm/apic.c b/hw/i386/kvm/apic.c
index c016e63fc2ba..be55102c00ca 100644
--- a/hw/i386/kvm/apic.c
+++ b/hw/i386/kvm/apic.c
@@ -169,6 +169,17 @@ static void kvm_apic_external_nmi(APICCommonState *s)
     run_on_cpu(CPU(s->cpu), do_inject_external_nmi, s);
 }
 
+static void kvm_send_msi(MSIMessage *msg)
+{
+    int ret;
+
+    ret = kvm_irqchip_send_msi(kvm_state, *msg);
+    if (ret < 0) {
+        fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
+                strerror(-ret));
+    }
+}
+
 static uint64_t kvm_apic_mem_read(void *opaque, hwaddr addr,
                                   unsigned size)
 {
@@ -179,13 +190,8 @@ static void kvm_apic_mem_write(void *opaque, hwaddr addr,
                                uint64_t data, unsigned size)
 {
     MSIMessage msg = { .address = addr, .data = data };
-    int ret;
 
-    ret = kvm_irqchip_send_msi(kvm_state, msg);
-    if (ret < 0) {
-        fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
-                strerror(-ret));
-    }
+    kvm_send_msi(&msg);
 }
 
 static const MemoryRegionOps kvm_apic_io_ops = {
@@ -232,6 +238,7 @@ static void kvm_apic_class_init(ObjectClass *klass, void *data)
     k->enable_tpr_reporting = kvm_apic_enable_tpr_reporting;
     k->vapic_base_update = kvm_apic_vapic_base_update;
     k->external_nmi = kvm_apic_external_nmi;
+    k->send_msi = kvm_send_msi;
 }
 
 static const TypeInfo kvm_apic_info = {
diff --git a/hw/i386/xen/xen_apic.c b/hw/i386/xen/xen_apic.c
index 21d68ee04b0a..55769eba7ede 100644
--- a/hw/i386/xen/xen_apic.c
+++ b/hw/i386/xen/xen_apic.c
@@ -68,6 +68,11 @@ static void xen_apic_external_nmi(APICCommonState *s)
 {
 }
 
+static void xen_send_msi(MSIMessage *msi)
+{
+    xen_hvm_inject_msi(msi->address, msi->data);
+}
+
 static void xen_apic_class_init(ObjectClass *klass, void *data)
 {
     APICCommonClass *k = APIC_COMMON_CLASS(klass);
@@ -78,6 +83,7 @@ static void xen_apic_class_init(ObjectClass *klass, void *data)
     k->get_tpr = xen_apic_get_tpr;
     k->vapic_base_update = xen_apic_vapic_base_update;
     k->external_nmi = xen_apic_external_nmi;
+    k->send_msi = xen_send_msi;
 }
 
 static const TypeInfo xen_apic_info = {
diff --git a/hw/intc/apic.c b/hw/intc/apic.c
index 7bd1d279c463..fe15fb602473 100644
--- a/hw/intc/apic.c
+++ b/hw/intc/apic.c
@@ -740,8 +740,10 @@ static uint32_t apic_mem_readl(void *opaque, hwaddr addr)
     return val;
 }
 
-static void apic_send_msi(hwaddr addr, uint32_t data)
+static void apic_send_msi(MSIMessage *msi)
 {
+    uint64_t addr = msi->address;
+    uint32_t data = msi->data;
     uint8_t dest = (addr & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT;
     uint8_t vector = (data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT;
     uint8_t dest_mode = (addr >> MSI_ADDR_DEST_MODE_SHIFT) & 0x1;
@@ -762,7 +764,8 @@ static void apic_mem_writel(void *opaque, hwaddr addr, uint32_t val)
          * APIC is connected directly to the CPU.
          * Mapping them on the global bus happens to work because
          * MSI registers are reserved in APIC MMIO and vice versa. */
-        apic_send_msi(addr, val);
+        MSIMessage msi = { .address = addr, .data = val };
+        apic_send_msi(&msi);
         return;
     }
 
@@ -913,6 +916,7 @@ static void apic_class_init(ObjectClass *klass, void *data)
     k->external_nmi = apic_external_nmi;
     k->pre_save = apic_pre_save;
     k->post_load = apic_post_load;
+    k->send_msi = apic_send_msi;
 }
 
 static const TypeInfo apic_info = {
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index 286684857e9f..cdd11fb0938f 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -146,6 +146,10 @@ typedef struct APICCommonClass
     void (*pre_save)(APICCommonState *s);
     void (*post_load)(APICCommonState *s);
     void (*reset)(APICCommonState *s);
+    /* send_msi emulates an APIC bus and its proper place would be in a new
+     * device, but it's convenient to have it here for now.
+     */
+    void (*send_msi)(MSIMessage *msi);
 } APICCommonClass;
 
 struct APICCommonState {
-- 
2.10.0