From: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
The current logic to determine if we don't need an emulated APLIC
controller, i.e. KVM will provide for us, is to determine if we're
running KVM, with in-kernel irqchip support, and running
aia=aplic-imsic. This is modelled by riscv_is_kvm_aia_aplic_imsic() and
virt_use_kvm_aia_aplic_imsic().
This won't suffice to support irqchip_split() mode: it will match
exactly the same conditions as the one above, but setting the irqchip to
'split' mode will now require us to emulate an APLIC s-mode controller,
like we're doing with 'aia=aplic'.
Create a new riscv_use_emulated_aplic() helper that will encapsulate
this logic. Replace the uses of "riscv_is_kvm_aia_aplic_imsic()" with
this helper every time we're taking a decision on emulate an APLIC
controller or not. Do the same in virt.c with virt_use_emulated_aplic().
Signed-off-by: Daniel Henrique Barboza <dbarb...@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.fran...@wdc.com>
Message-ID: <20241119191706.718860-6-dbarb...@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.fran...@wdc.com>
---
include/hw/intc/riscv_aplic.h | 1 +
hw/intc/riscv_aplic.c | 24 +++++++++++++++++++++---
hw/riscv/virt.c | 14 ++++++++++++--
3 files changed, 34 insertions(+), 5 deletions(-)
diff --git a/include/hw/intc/riscv_aplic.h b/include/hw/intc/riscv_aplic.h
index fd0e6427d9..74ae5d87b5 100644
--- a/include/hw/intc/riscv_aplic.h
+++ b/include/hw/intc/riscv_aplic.h
@@ -72,6 +72,7 @@ struct RISCVAPLICState {
void riscv_aplic_add_child(DeviceState *parent, DeviceState *child);
bool riscv_is_kvm_aia_aplic_imsic(bool msimode);
+bool riscv_use_emulated_aplic(bool msimode);
DeviceState *riscv_aplic_create(hwaddr addr, hwaddr size,
uint32_t hartid_base, uint32_t num_harts, uint32_t num_sources,
diff --git a/hw/intc/riscv_aplic.c b/hw/intc/riscv_aplic.c
index 9f9814a40b..ba4e802888 100644
--- a/hw/intc/riscv_aplic.c
+++ b/hw/intc/riscv_aplic.c
@@ -32,6 +32,7 @@
#include "target/riscv/cpu.h"
#include "sysemu/sysemu.h"
#include "sysemu/kvm.h"
+#include "sysemu/tcg.h"
#include "kvm/kvm_riscv.h"
#include "migration/vmstate.h"
@@ -159,6 +160,23 @@ bool riscv_is_kvm_aia_aplic_imsic(bool msimode)
return kvm_irqchip_in_kernel() && msimode;
}
+bool riscv_use_emulated_aplic(bool msimode)
+{
+#ifdef CONFIG_KVM
+ if (tcg_enabled()) {
+ return true;
+ }
+
+ if (!riscv_is_kvm_aia_aplic_imsic(msimode)) {
+ return true;
+ }
+
+ return kvm_kernel_irqchip_split();
+#else
+ return true;
+#endif
+}
+
static bool riscv_aplic_irq_rectified_val(RISCVAPLICState *aplic,
uint32_t irq)
{
@@ -857,7 +875,7 @@ static void riscv_aplic_realize(DeviceState *dev, Error
**errp)
uint32_t i;
RISCVAPLICState *aplic = RISCV_APLIC(dev);
- if (!riscv_is_kvm_aia_aplic_imsic(aplic->msimode)) {
+ if (riscv_use_emulated_aplic(aplic->msimode)) {
aplic->bitfield_words = (aplic->num_irqs + 31) >> 5;
aplic->sourcecfg = g_new0(uint32_t, aplic->num_irqs);
aplic->state = g_new0(uint32_t, aplic->num_irqs);
@@ -881,7 +899,7 @@ static void riscv_aplic_realize(DeviceState *dev, Error
**errp)
* have IRQ lines delegated by their parent APLIC.
*/
if (!aplic->parent) {
- if (kvm_enabled() && riscv_is_kvm_aia_aplic_imsic(aplic->msimode)) {
+ if (kvm_enabled() && !riscv_use_emulated_aplic(aplic->msimode)) {
qdev_init_gpio_in(dev, riscv_kvm_aplic_request, aplic->num_irqs);
} else {
qdev_init_gpio_in(dev, riscv_aplic_request, aplic->num_irqs);
@@ -1025,7 +1043,7 @@ DeviceState *riscv_aplic_create(hwaddr addr, hwaddr size,
sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
- if (!riscv_is_kvm_aia_aplic_imsic(msimode)) {
+ if (riscv_use_emulated_aplic(msimode)) {
sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, addr);
}
diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index a67ab80b16..937dfd1ef2 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -66,6 +66,13 @@ static bool virt_use_kvm_aia_aplic_imsic(RISCVVirtAIAType
aia_type)
return riscv_is_kvm_aia_aplic_imsic(msimode);
}
+static bool virt_use_emulated_aplic(RISCVVirtAIAType aia_type)
+{
+ bool msimode = aia_type == VIRT_AIA_TYPE_APLIC_IMSIC;
+
+ return riscv_use_emulated_aplic(msimode);
+}
+
static bool virt_aclint_allowed(void)
{
return tcg_enabled() || qtest_enabled();
@@ -779,8 +786,11 @@ static void create_fdt_sockets(RISCVVirtState *s, const
MemMapEntry *memmap,
*msi_pcie_phandle = msi_s_phandle;
}
- /* KVM AIA aplic-imsic only has one APLIC instance */
- if (kvm_enabled() && virt_use_kvm_aia_aplic_imsic(s->aia_type)) {
+ /*
+ * With KVM AIA aplic-imsic, using an irqchip without split
+ * mode, we'll use only one APLIC instance.
+ */
+ if (!virt_use_emulated_aplic(s->aia_type)) {
create_fdt_socket_aplic(s, memmap, 0,
msi_m_phandle, msi_s_phandle, phandle,
&intc_phandles[0], xplic_phandles,
--
2.47.1
