Add the basic infrastructure to describe injection of exceptions
into a guest. So far, nothing uses this code path.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arch/arm64/include/asm/kvm_host.h | 28 ++++++++++++++++++++--
arch/arm64/kvm/hyp/exception.c | 17 +++++++++++++
arch/arm64/kvm/hyp/include/hyp/adjust_pc.h | 10 ++++++--
arch/arm64/kvm/hyp/nvhe/Makefile | 2 +-
arch/arm64/kvm/hyp/vhe/Makefile | 2 +-
5 files changed, 53 insertions(+), 6 deletions(-)
create mode 100644 arch/arm64/kvm/hyp/exception.c
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 0672b3db6121..7a1faf917f3c 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -407,9 +407,33 @@ struct kvm_vcpu_arch {
#define KVM_ARM64_GUEST_HAS_SVE (1 << 5) /* SVE exposed to guest */
#define KVM_ARM64_VCPU_SVE_FINALIZED (1 << 6) /* SVE config completed */
#define KVM_ARM64_GUEST_HAS_PTRAUTH (1 << 7) /* PTRAUTH exposed to guest */
-#define KVM_ARM64_INCREMENT_PC (1 << 8) /* Increment PC */
+#define KVM_ARM64_PENDING_EXCEPTION (1 << 8) /* Exception pending */
+#define KVM_ARM64_EXCEPT_MASK (7 << 9) /* Target EL/MODE */
-#define vcpu_has_sve(vcpu) (system_supports_sve() && \
+/*
+ * When KVM_ARM64_PENDING_EXCEPTION is set, KVM_ARM64_EXCEPT_MASK can
+ * take the following values:
+ *
+ * For AArch32 EL1:
+ */
+#define KVM_ARM64_EXCEPT_AA32_UND (0 << 9)
+#define KVM_ARM64_EXCEPT_AA32_IABT (1 << 9)
+#define KVM_ARM64_EXCEPT_AA32_DABT (2 << 9)
+/* For AArch64: */
+#define KVM_ARM64_EXCEPT_AA64_ELx_SYNC (0 << 9)
+#define KVM_ARM64_EXCEPT_AA64_ELx_IRQ (1 << 9)
+#define KVM_ARM64_EXCEPT_AA64_ELx_FIQ (2 << 9)
+#define KVM_ARM64_EXCEPT_AA64_ELx_SERR (3 << 9)
+#define KVM_ARM64_EXCEPT_AA64_EL1 (0 << 11)
+#define KVM_ARM64_EXCEPT_AA64_EL2 (1 << 11)
+
+/*
+ * Overlaps with KVM_ARM64_EXCEPT_MASK on purpose so that it can't be
+ * set together with an exception...
+ */
+#define KVM_ARM64_INCREMENT_PC (1 << 9) /* Increment PC */
+
+#define vcpu_has_sve(vcpu) (system_supports_sve() && \
((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE))
#ifdef CONFIG_ARM64_PTR_AUTH
diff --git a/arch/arm64/kvm/hyp/exception.c b/arch/arm64/kvm/hyp/exception.c
new file mode 100644
index 000000000000..6533a9270850
--- /dev/null
+++ b/arch/arm64/kvm/hyp/exception.c
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Fault injection for both 32 and 64bit guests.
+ *
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@xxxxxxx>
+ *
+ * Based on arch/arm/kvm/emulate.c
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Author: Christoffer Dall <c.dall@xxxxxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <hyp/adjust_pc.h>
+
+void kvm_inject_exception(struct kvm_vcpu *vcpu)
+{
+}
diff --git a/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h b/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
index d3043b07e78e..b1f60923a8fe 100644
--- a/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
+++ b/arch/arm64/kvm/hyp/include/hyp/adjust_pc.h
@@ -13,6 +13,8 @@
#include <asm/kvm_emulate.h>
#include <asm/kvm_host.h>
+void kvm_inject_exception(struct kvm_vcpu *vcpu);
+
static inline void kvm_skip_instr(struct kvm_vcpu *vcpu)
{
if (vcpu_mode_is_32bit(vcpu)) {
@@ -43,11 +45,15 @@ static inline void __kvm_skip_instr(struct kvm_vcpu *vcpu)
/*
* Adjust the guest PC on entry, depending on flags provided by EL1
- * for the purpose of emulation (MMIO, sysreg).
+ * for the purpose of emulation (MMIO, sysreg) or exception injection.
*/
static inline void __adjust_pc(struct kvm_vcpu *vcpu)
{
- if (vcpu->arch.flags & KVM_ARM64_INCREMENT_PC) {
+ if (vcpu->arch.flags & KVM_ARM64_PENDING_EXCEPTION) {
+ kvm_inject_exception(vcpu);
+ vcpu->arch.flags &= ~(KVM_ARM64_PENDING_EXCEPTION |
+ KVM_ARM64_EXCEPT_MASK);
+ } else if (vcpu->arch.flags & KVM_ARM64_INCREMENT_PC) {
kvm_skip_instr(vcpu);
vcpu->arch.flags &= ~KVM_ARM64_INCREMENT_PC;
}
diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index ddde15fe85f2..77b8c4e06f2f 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -8,7 +8,7 @@ ccflags-y := -D__KVM_NVHE_HYPERVISOR__
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o hyp-init.o host.o hyp-main.o
obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
- ../fpsimd.o ../hyp-entry.o
+ ../fpsimd.o ../hyp-entry.o ../exception.o
##
## Build rules for compiling nVHE hyp code
diff --git a/arch/arm64/kvm/hyp/vhe/Makefile b/arch/arm64/kvm/hyp/vhe/Makefile
index 461e97c375cc..96bec0ecf9dd 100644
--- a/arch/arm64/kvm/hyp/vhe/Makefile
+++ b/arch/arm64/kvm/hyp/vhe/Makefile
@@ -8,4 +8,4 @@ ccflags-y := -D__KVM_VHE_HYPERVISOR__
obj-y := timer-sr.o sysreg-sr.o debug-sr.o switch.o tlb.o
obj-y += ../vgic-v3-sr.o ../aarch32.o ../vgic-v2-cpuif-proxy.o ../entry.o \
- ../fpsimd.o ../hyp-entry.o
+ ../fpsimd.o ../hyp-entry.o ../exception.o
--
2.28.0
