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[PATCH] KVM: remove support for kernel-irqchip=off
From: |
Paolo Bonzini |
Subject: |
[PATCH] KVM: remove support for kernel-irqchip=off |
Date: |
Sun, 18 Dec 2022 01:06:46 +0100 |
-machine kernel-irqchip=off is broken for many guest OSes; kernel-irqchip=split
is the replacement that works, so remove the deprecated support for the former.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
docs/about/deprecated.rst | 7 -------
docs/about/removed-features.rst | 7 +++++++
hw/i386/amd_iommu.c | 2 +-
hw/i386/intel_iommu.c | 4 ++--
include/hw/i386/apic_internal.h | 2 +-
target/i386/cpu-sysemu.c | 15 +++++++++++----
6 files changed, 22 insertions(+), 15 deletions(-)
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
index b28f50b22fa9..f1575a52cb4d 100644
--- a/docs/about/deprecated.rst
+++ b/docs/about/deprecated.rst
@@ -58,13 +58,6 @@ and will cause a warning.
The replacement for the ``nodelay`` short-form boolean option is ``nodelay=on``
rather than ``delay=off``.
-Userspace local APIC with KVM (x86, since 6.0)
-''''''''''''''''''''''''''''''''''''''''''''''
-
-Using ``-M kernel-irqchip=off`` with x86 machine types that include a local
-APIC is deprecated. The ``split`` setting is supported, as is using
-``-M kernel-irqchip=off`` with the ISA PC machine type.
-
hexadecimal sizes with scaling multipliers (since 6.0)
''''''''''''''''''''''''''''''''''''''''''''''''''''''
diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst
index 91c9dce6d6e0..76c2178cd39e 100644
--- a/docs/about/removed-features.rst
+++ b/docs/about/removed-features.rst
@@ -625,6 +625,13 @@ MIPS "Trap-and-Emulate" KVM support (removed in 8.0)
The MIPS "Trap-and-Emulate" KVM host and guest support was removed
from Linux in 2021, and is not supported anymore by QEMU either.
+Userspace local APIC with KVM (x86, removed 8.0)
+''''''''''''''''''''''''''''''''''''''''''''''''
+
+``-M kernel-irqchip=off`` cannot be used on KVM if the CPU model includes
+a local APIC. The ``split`` setting is supported, as is using ``-M
+kernel-irqchip=off`` when the CPU does not have a local APIC.
+
System emulator machines
------------------------
diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index 725f69095b9e..bcd016f5c5a5 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -1368,7 +1368,7 @@ static MemTxResult amdvi_mem_ir_write(void *opaque,
hwaddr addr,
return MEMTX_ERROR;
}
- apic_get_class()->send_msi(&to);
+ apic_get_class(NULL)->send_msi(&to);
trace_amdvi_mem_ir_write(to.address, to.data);
return MEMTX_OK;
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index a08ee85edf2a..98a5c304a7d7 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -396,7 +396,7 @@ static void vtd_generate_interrupt(IntelIOMMUState *s,
hwaddr mesg_addr_reg,
trace_vtd_irq_generate(msi.address, msi.data);
- apic_get_class()->send_msi(&msi);
+ apic_get_class(NULL)->send_msi(&msi);
}
/* Generate a fault event to software via MSI if conditions are met.
@@ -3529,7 +3529,7 @@ static MemTxResult vtd_mem_ir_write(void *opaque, hwaddr
addr,
return MEMTX_ERROR;
}
- apic_get_class()->send_msi(&to);
+ apic_get_class(NULL)->send_msi(&to);
return MEMTX_OK;
}
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index c175e7e71816..968b6648b3a4 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -226,6 +226,6 @@ static inline int apic_get_bit(uint32_t *tab, int index)
return !!(tab[i] & mask);
}
-APICCommonClass *apic_get_class(void);
+APICCommonClass *apic_get_class(Error **errp);
#endif /* QEMU_APIC_INTERNAL_H */
diff --git a/target/i386/cpu-sysemu.c b/target/i386/cpu-sysemu.c
index fc97213a73cf..28115edf44f7 100644
--- a/target/i386/cpu-sysemu.c
+++ b/target/i386/cpu-sysemu.c
@@ -247,12 +247,16 @@ void x86_cpu_machine_reset_cb(void *opaque)
cpu_reset(CPU(cpu));
}
-APICCommonClass *apic_get_class(void)
+APICCommonClass *apic_get_class(Error **errp)
{
const char *apic_type = "apic";
/* TODO: in-kernel irqchip for hvf */
- if (kvm_apic_in_kernel()) {
+ if (kvm_enabled()) {
+ if (!kvm_apic_in_kernel()) {
+ error_setg(errp, "KVM does not support userspace APIC");
+ return NULL;
+ }
apic_type = "kvm-apic";
} else if (xen_enabled()) {
apic_type = "xen-apic";
@@ -266,10 +270,13 @@ APICCommonClass *apic_get_class(void)
void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
{
APICCommonState *apic;
- ObjectClass *apic_class = OBJECT_CLASS(apic_get_class());
+ APICCommonClass *apic_class = apic_get_class(errp);
- cpu->apic_state = DEVICE(object_new_with_class(apic_class));
+ if (!apic_class) {
+ return;
+ }
+ cpu->apic_state = DEVICE(object_new_with_class(OBJECT_CLASS(apic_class)));
object_property_add_child(OBJECT(cpu), "lapic",
OBJECT(cpu->apic_state));
object_unref(OBJECT(cpu->apic_state));
--
2.38.1
- [PATCH] KVM: remove support for kernel-irqchip=off,
Paolo Bonzini <=