base-nova: allow MSI for non-PCI devices

DMA remapping hardware units use MSI for fault events. However, MSI
were bound to the presence of a PCI configuration space.

genodelabs/genode#5002

repos/base-nova/patches/syscall_msi.patch

@@ -0,0 +1,13 @@
+diff --git a/src/syscall.cpp b/src/syscall.cpp
+index 838bfee..5619293 100644
+--- a/src/syscall.cpp
++++ b/src/syscall.cpp
+@@ -1205,7 +1205,7 @@ void Ec::sys_assign_gsi()
+         sys_finish<Sys_regs::BAD_DEV>();
+     }
+ 
+-    if (EXPECT_FALSE (!Gsi::gsi_table[gsi].ioapic && (!Pd::current->Space_mem::lookup (r->dev(), phys) || ((rid = Pci::phys_to_rid (phys)) == ~0U && (rid = Hpet::phys_to_rid (phys)) == ~0U)))) {
++    if (EXPECT_FALSE (!Gsi::gsi_table[gsi].ioapic && r->dev() && (!Pd::current->Space_mem::lookup (r->dev(), phys) || ((rid = Pci::phys_to_rid (phys)) == ~0U && (rid = Hpet::phys_to_rid (phys)) == ~0U)))) {
+         trace (TRACE_ERROR, "%s: Non-DEV CAP (%#lx)", __func__, r->dev());
+         sys_finish<Sys_regs::BAD_DEV>();
+     }

repos/base-nova/ports/nova.hash

@@ -1 +1 @@
-e104241c249b88b6e0a4ff74bda67996dfa200c4
+851c274f32d9ba3706a20407755ce6d17139afc6

repos/base-nova/ports/nova.port

@@ -8,3 +8,4 @@ REV(nova) := 3e34fa6c35c55566ae57a1fd654262964ffcf544
 DIR(nova) := src/kernel/nova
 
 PATCHES   := $(sort $(wildcard $(REP_DIR)/patches/*.patch))
+PATCH_OPT := -p1 -d ${DIR(nova)}

repos/base-nova/src/core/irq_session_component.cc

@@ -64,6 +64,9 @@ static void deassociate(addr_t irq_sel)
 static bool associate_msi(addr_t irq_sel, addr_t phys_mem, addr_t &msi_addr,
                           addr_t &msi_data, Signal_context_capability sig_cap)
 {
+	if (!phys_mem)
+		return irq_ctrl(irq_sel, msi_addr, msi_data, sig_cap.local_name(), Nova::Gsi_flags(), 0);
+
 	return platform().region_alloc().alloc_aligned(4096, 12).convert<bool>(
 
 		[&] (void *virt_ptr) {