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-rw-r--r--arch/arm64/include/asm/kvm_host.h2
-rw-r--r--arch/arm64/include/uapi/asm/kvm.h1
-rw-r--r--arch/arm64/kvm/guest.c6
-rw-r--r--arch/arm64/kvm/reset.c26
-rw-r--r--include/uapi/linux/kvm.h1
5 files changed, 34 insertions, 2 deletions
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 3f5830b..644d739 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -34,7 +34,7 @@
#include <kvm/arm_vgic.h>
#include <kvm/arm_arch_timer.h>
-#define KVM_VCPU_MAX_FEATURES 1
+#define KVM_VCPU_MAX_FEATURES 2
/* We don't currently support large pages. */
#define KVM_HPAGE_GFN_SHIFT(x) 0
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 5b1110c..5031f42 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -75,6 +75,7 @@ struct kvm_regs {
#define KVM_VGIC_V2_CPU_SIZE 0x2000
#define KVM_ARM_VCPU_POWER_OFF 0 /* CPU is started in OFF state */
+#define KVM_ARM_VCPU_EL1_32BIT 1 /* CPU running a 32bit VM */
struct kvm_vcpu_init {
__u32 target;
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 3d7518a..2c3ff67 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -99,6 +99,12 @@ static int set_core_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
if (off == KVM_REG_ARM_CORE_REG(regs.pstate)) {
u32 mode = (*(u32 *)valp) & COMPAT_PSR_MODE_MASK;
switch (mode) {
+ case COMPAT_PSR_MODE_USR:
+ case COMPAT_PSR_MODE_FIQ:
+ case COMPAT_PSR_MODE_IRQ:
+ case COMPAT_PSR_MODE_SVC:
+ case COMPAT_PSR_MODE_ABT:
+ case COMPAT_PSR_MODE_UND:
case PSR_MODE_EL0t:
case PSR_MODE_EL1t:
case PSR_MODE_EL1h:
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 766150a..70a7816 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -38,16 +38,32 @@ static const struct kvm_regs default_regs_reset = {
PSR_F_BIT | PSR_D_BIT),
};
+static const struct kvm_regs default_regs_reset32 = {
+ .regs.pstate = (COMPAT_PSR_MODE_SVC | COMPAT_PSR_A_BIT |
+ COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT),
+};
+
static const struct kvm_irq_level default_vtimer_irq = {
.irq = 27,
.level = 1,
};
+static bool cpu_has_32bit_el1(void)
+{
+ u64 pfr0;
+
+ pfr0 = read_cpuid(ID_AA64PFR0_EL1);
+ return !!(pfr0 & 0x20);
+}
+
int kvm_arch_dev_ioctl_check_extension(long ext)
{
int r;
switch (ext) {
+ case KVM_CAP_ARM_EL1_32BIT:
+ r = cpu_has_32bit_el1();
+ break;
default:
r = 0;
}
@@ -70,7 +86,15 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu)
switch (vcpu->arch.target) {
default:
- cpu_reset = &default_regs_reset;
+ if (test_bit(KVM_ARM_VCPU_EL1_32BIT, vcpu->arch.features)) {
+ if (!cpu_has_32bit_el1())
+ return -EINVAL;
+ cpu_reset = &default_regs_reset32;
+ vcpu->arch.hcr_el2 &= ~HCR_RW;
+ } else {
+ cpu_reset = &default_regs_reset;
+ }
+
cpu_vtimer_irq = &default_vtimer_irq;
break;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 2d1bcb8..aac2764 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -666,6 +666,7 @@ struct kvm_ppc_smmu_info {
#define KVM_CAP_IRQ_MPIC 90
#define KVM_CAP_PPC_RTAS 91
#define KVM_CAP_IRQ_XICS 92
+#define KVM_CAP_ARM_EL1_32BIT 93
#ifdef KVM_CAP_IRQ_ROUTING