From: Christoffer Dall <cdall@xxxxxxxxxxxxxxx>
Add basic support for KVM on ARM architecture.
Signed-off-by: Christoffer Dall <cdall@xxxxxxxxxxxxxxx>
[Rusty: updates to use KVM_ARM_VCPU_INIT, KVM_GET/SET_MSRS]
Signed-off-by: Rusty Russell <rusty.russell@xxxxxxxxxx>
[PMM: Minor tweaks and code cleanup]
Signed-off-by: Peter Maydell <peter.maydell@xxxxxxxxxx>
---
hw/arm_pic.c | 28 +++++
target-arm/Makefile.objs | 1 +
target-arm/cpu.h | 1 +
target-arm/helper.c | 2 +-
target-arm/kvm.c | 274 ++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 305 insertions(+), 1 deletion(-)
create mode 100644 target-arm/kvm.c
diff --git a/hw/arm_pic.c b/hw/arm_pic.c
index ffb4d41..950e6c4 100644
--- a/hw/arm_pic.c
+++ b/hw/arm_pic.c
@@ -9,6 +9,7 @@
#include "hw.h"
#include "arm-misc.h"
+#include "kvm.h"
/* Input 0 is IRQ and input 1 is FIQ. */
static void arm_pic_cpu_handler(void *opaque, int irq, int level)
@@ -34,7 +35,34 @@ static void arm_pic_cpu_handler(void *opaque, int irq, int level)
}
}
+#ifdef CONFIG_KVM
+static void kvm_arm_pic_cpu_handler(void *opaque, int irq, int level)
+{
+ ARMCPU *cpu = opaque;
+ CPUARMState *env = &cpu->env;
+ int kvm_irq;
+
+ switch (irq) {
+ case ARM_PIC_CPU_IRQ:
+ kvm_irq = KVM_ARM_IRQ_LINE;
+ break;
+ case ARM_PIC_CPU_FIQ:
+ kvm_irq = KVM_ARM_FIQ_LINE;
+ break;
+ default:
+ hw_error("kvm_arm_pic_cpu_handler: Bad interrupt line %d\n", irq);
+ }
+ kvm_irq |= (env->cpu_index << 1);
+ kvm_set_irq(kvm_state, kvm_irq, level ? 1 : 0);
+}
+#endif
+
qemu_irq *arm_pic_init_cpu(ARMCPU *cpu)
{
+#ifdef CONFIG_KVM
+ if (kvm_enabled()) {
+ return qemu_allocate_irqs(kvm_arm_pic_cpu_handler, cpu, 2);
+ }
+#endif
return qemu_allocate_irqs(arm_pic_cpu_handler, cpu, 2);
}
diff --git a/target-arm/Makefile.objs b/target-arm/Makefile.objs
index f447c4f..f906d20 100644
--- a/target-arm/Makefile.objs
+++ b/target-arm/Makefile.objs
@@ -1,5 +1,6 @@
obj-y += arm-semi.o
obj-$(CONFIG_SOFTMMU) += machine.o
+obj-$(CONFIG_KVM) += kvm.o
obj-y += translate.o op_helper.o helper.o cpu.o
obj-y += neon_helper.o iwmmxt_helper.o
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 191895c..5194bad 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -236,6 +236,7 @@ ARMCPU *cpu_arm_init(const char *cpu_model);
void arm_translate_init(void);
int cpu_arm_exec(CPUARMState *s);
void do_interrupt(CPUARMState *);
+int bank_number(CPUARMState *env, int mode);
void switch_mode(CPUARMState *, int);
uint32_t do_arm_semihosting(CPUARMState *env);
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 5727da2..632a366 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1619,7 +1619,7 @@ uint32_t HELPER(get_r13_banked)(CPUARMState *env, uint32_t mode)
#else
/* Map CPU modes onto saved register banks. */
-static inline int bank_number(CPUARMState *env, int mode)
+int bank_number(CPUARMState *env, int mode)
{
switch (mode) {
case ARM_CPU_MODE_USR:
diff --git a/target-arm/kvm.c b/target-arm/kvm.c
new file mode 100644
index 0000000..b9abee0
--- /dev/null
+++ b/target-arm/kvm.c
@@ -0,0 +1,274 @@
+/*
+ * ARM implementation of KVM hooks
+ *
+ * Copyright Christoffer Dall 2009-2010
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <linux/kvm.h>
+
+#include "qemu-common.h"
+#include "qemu-timer.h"
+#include "sysemu.h"
+#include "kvm.h"
+#include "cpu.h"
+#include "device_tree.h"
+#include "hw/arm-misc.h"
+
+const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
+ KVM_CAP_LAST_INFO
+};
+
+int kvm_arch_init(KVMState *s)
+{
+ /* For ARM interrupt delivery is always asynchronous,
+ * whether we are using an in-kernel VGIC or not.
+ */
+ kvm_async_interrupts_allowed = true;
+ return 0;
+}
+
+int kvm_arch_init_vcpu(CPUARMState *env)
+{
+ struct kvm_vcpu_init init;
+
+ init.target = KVM_ARM_TARGET_CORTEX_A15;
+ memset(init.features, 0, sizeof(init.features));
+ return kvm_vcpu_ioctl(env, KVM_ARM_VCPU_INIT, &init);
+}
+
+#define MSR32_INDEX_OF(coproc, crn, opc1, crm, opc2) \
+ (((coproc)<<16) | ((opc1)<<11) | ((crn)<<7) | ((opc2)<<4) | (crm))
+
+int kvm_arch_put_registers(CPUARMState *env, int level)
+{
+ struct kvm_regs regs;
+ int mode, bn;
+ struct cp15 {
+ struct kvm_msrs hdr;
+ struct kvm_msr_entry e[2];
+ } cp15;
+ int ret;
+
+ ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* We make sure the banked regs are properly set */
+ mode = env->uncached_cpsr & CPSR_M;
+ bn = bank_number(env, mode);
+ if (mode == ARM_CPU_MODE_FIQ) {
+ memcpy(env->fiq_regs, env->regs + 8, 5 * sizeof(uint32_t));
+ } else {
+ memcpy(env->usr_regs, env->regs + 8, 5 * sizeof(uint32_t));
+ }
+ env->banked_r13[bn] = env->regs[13];
+ env->banked_r14[bn] = env->regs[14];
+ env->banked_spsr[bn] = env->spsr;
+
+ /* Now we can safely copy stuff down to the kernel */
+ memcpy(regs.regs0_7, env->regs, sizeof(uint32_t) * 8);
+ memcpy(regs.usr_regs8_12, env->usr_regs, sizeof(uint32_t) * 5);
+ memcpy(regs.fiq_regs8_12, env->fiq_regs, sizeof(uint32_t) * 5);
+ regs.reg13[MODE_FIQ] = env->banked_r13[5];
+ regs.reg13[MODE_IRQ] = env->banked_r13[4];
+ regs.reg13[MODE_SVC] = env->banked_r13[1];
+ regs.reg13[MODE_ABT] = env->banked_r13[2];
+ regs.reg13[MODE_UND] = env->banked_r13[3];
+ regs.reg13[MODE_USR] = env->banked_r13[0];
+ regs.reg14[MODE_FIQ] = env->banked_r14[5];
+ regs.reg14[MODE_IRQ] = env->banked_r14[4];
+ regs.reg14[MODE_SVC] = env->banked_r14[1];
+ regs.reg14[MODE_ABT] = env->banked_r14[2];
+ regs.reg14[MODE_UND] = env->banked_r14[3];
+ regs.reg14[MODE_USR] = env->banked_r14[0];
+ regs.reg15 = env->regs[15];
+ regs.cpsr = cpsr_read(env);
+ regs.spsr[MODE_FIQ] = env->banked_spsr[5];
+ regs.spsr[MODE_IRQ] = env->banked_spsr[4];
+ regs.spsr[MODE_SVC] = env->banked_spsr[1];
+ regs.spsr[MODE_ABT] = env->banked_spsr[2];
+ regs.spsr[MODE_UND] = env->banked_spsr[3];
+
+ cp15.hdr.nmsrs = ARRAY_SIZE(cp15.e);
+ cp15.e[0].index = MSR32_INDEX_OF(15, 0, 0, 0, 0); /* MIDR */
+ cp15.e[0].data = env->cp15.c0_cpuid;
+ cp15.e[1].index = MSR32_INDEX_OF(15, 1, 0, 0, 0); /* SCTLR */
+ cp15.e[1].data = env->cp15.c1_sys;
+
+ ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, ®s);
+ if (ret == 0) {
+ ret = kvm_vcpu_ioctl(env, KVM_SET_MSRS, &cp15);
+ }
+ return ret;
+}
+
+int kvm_arch_get_registers(CPUARMState *env)
+{
+ struct kvm_regs regs;
+ int mode, bn;
+ int32_t ret;
+ struct cp15 {
+ struct kvm_msrs hdr;
+ struct kvm_msr_entry e[6];
+ } cp15;
+
+
+ ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, ®s);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /* First, let's transfer the banked state */
+ cpsr_write(env, regs.cpsr, 0xFFFFFFFF);
+ memcpy(env->regs, regs.regs0_7, sizeof(uint32_t) * 8);
+ memcpy(env->usr_regs, regs.usr_regs8_12, sizeof(uint32_t) * 5);
+ memcpy(env->fiq_regs, regs.fiq_regs8_12, sizeof(uint32_t) * 5);
+
+ env->banked_r13[5] = regs.reg13[MODE_FIQ];
+ env->banked_r13[4] = regs.reg13[MODE_IRQ];
+ env->banked_r13[1] = regs.reg13[MODE_SVC];
+ env->banked_r13[2] = regs.reg13[MODE_ABT];
+ env->banked_r13[3] = regs.reg13[MODE_UND];
+ env->banked_r13[0] = regs.reg13[MODE_USR];
+ env->banked_r14[5] = regs.reg14[MODE_FIQ];
+ env->banked_r14[4] = regs.reg14[MODE_IRQ];
+ env->banked_r14[1] = regs.reg14[MODE_SVC];
+ env->banked_r14[2] = regs.reg14[MODE_ABT];
+ env->banked_r14[3] = regs.reg14[MODE_UND];
+ env->banked_r14[0] = regs.reg14[MODE_USR];
+ env->regs[15] = regs.reg15;
+ env->banked_spsr[5] = regs.spsr[MODE_FIQ];
+ env->banked_spsr[4] = regs.spsr[MODE_IRQ];
+ env->banked_spsr[1] = regs.spsr[MODE_SVC];
+ env->banked_spsr[2] = regs.spsr[MODE_ABT];
+ env->banked_spsr[3] = regs.spsr[MODE_UND];
+
+ /* We make sure the current mode regs are properly set */
+ mode = env->uncached_cpsr & CPSR_M;
+ bn = bank_number(env, mode);
+ if (mode == ARM_CPU_MODE_FIQ) {
+ memcpy(env->regs + 8, env->fiq_regs, 5 * sizeof(uint32_t));
+ } else {
+ memcpy(env->regs + 8, env->usr_regs, 5 * sizeof(uint32_t));
+ }
+ env->regs[13] = env->banked_r13[bn];
+ env->regs[14] = env->banked_r14[bn];
+ env->spsr = env->banked_spsr[bn];
+
+ /* TODO: investigate automatically getting all registers
+ * we know about via the ARMCPU cp_regs hashtable.
+ */
+ cp15.hdr.nmsrs = ARRAY_SIZE(cp15.e);
+ cp15.e[0].index = MSR32_INDEX_OF(15, 0, 0, 0, 0); /* MIDR */
+ cp15.e[1].index = MSR32_INDEX_OF(15, 1, 0, 0, 0); /* SCTLR */
+ cp15.e[2].index = MSR32_INDEX_OF(15, 2, 0, 0, 0); /* TTBR0 */
+ cp15.e[3].index = MSR32_INDEX_OF(15, 2, 0, 0, 1); /* TTBR1 */
+ cp15.e[4].index = MSR32_INDEX_OF(15, 2, 0, 0, 2); /* TTBCR */
+ cp15.e[5].index = MSR32_INDEX_OF(15, 3, 0, 0, 0); /* DACR */
+
+ ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &cp15);
+ if (ret < 0) {
+ return ret;
+ }
+
+ env->cp15.c1_sys = cp15.e[1].data;
+ env->cp15.c2_base0 = cp15.e[2].data;
+ env->cp15.c2_base1 = cp15.e[3].data;
+
+ /* This is ugly, but necessary for GDB compatibility
+ * TODO: do this via an access function.
+ */
+ env->cp15.c2_control = cp15.e[4].data;
+ env->cp15.c2_mask = ~(((uint32_t)0xffffffffu) >> cp15.e[4].data);
+ env->cp15.c2_base_mask = ~((uint32_t)0x3fffu >> cp15.e[4].data);
+
+ env->cp15.c3 = cp15.e[5].data;
+ return 0;
+}
+
+void kvm_arch_pre_run(CPUARMState *env, struct kvm_run *run)
+{
+}
+
+void kvm_arch_post_run(CPUARMState *env, struct kvm_run *run)
+{
+}
+
+int kvm_arch_handle_exit(CPUARMState *env, struct kvm_run *run)
+{
+ int ret = 0;
+
+ return ret;
+}
+
+void kvm_arch_reset_vcpu(CPUARMState *env)
+{
+}
+
+bool kvm_arch_stop_on_emulation_error(CPUARMState *env)
+{
+ return true;
+}
+
+int kvm_arch_process_async_events(CPUARMState *env)
+{
+ return 0;
+}
+
+int kvm_arch_on_sigbus_vcpu(CPUARMState *env, int code, void *addr)
+{
+ return 1;
+}
+
+int kvm_arch_on_sigbus(int code, void *addr)
+{
+ return 1;
+}
+
+void kvm_arch_update_guest_debug(CPUARMState *env, struct kvm_guest_debug *dbg)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+}
+
+int kvm_arch_insert_sw_breakpoint(CPUARMState *env,
+ struct kvm_sw_breakpoint *bp)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+ return -EINVAL;
+}
+
+int kvm_arch_insert_hw_breakpoint(target_ulong addr,
+ target_ulong len, int type)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+ return -EINVAL;
+}
+
+int kvm_arch_remove_hw_breakpoint(target_ulong addr,
+ target_ulong len, int type)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+ return -EINVAL;
+}
+
+int kvm_arch_remove_sw_breakpoint(CPUARMState *env,
+ struct kvm_sw_breakpoint *bp)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+ return -EINVAL;
+}
+
+void kvm_arch_remove_all_hw_breakpoints(void)
+{
+ fprintf(stderr, "%s: not implemented\n", __func__);
+}
--
1.7.9.5
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