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Revert "Revert "ANDROID: KVM: arm64: Add initial support for KVM_CAP_EXIT_HYPERCALL""

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This reverts commit 94bf7ff642.

Bug: 233587962
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: Ie60089221f571a98e5a8cb8f0ba87ac81bb1b6d3
This commit is contained in:
Will Deacon
2022-07-07 15:48:58 +01:00
parent ab71832edb
commit 49625f6cd7
3 changed files with 43 additions and 0 deletions
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2
arch/arm64/include/asm/kvm_host.h
View File

@@ -211,6 +211,8 @@ struct kvm_arch {
u8 pfr0_csv3;
struct kvm_protected_vm pkvm;
u64 hypercall_exit_enabled;
};
struct kvm_protected_vcpu {

23
arch/arm64/kvm/arm.c
View File

@@ -64,6 +64,9 @@ static bool vgic_present;
static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled);
DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
/* KVM "vendor" hypercalls which may be forwarded to userspace on request. */
#define KVM_EXIT_HYPERCALL_VALID_MASK (0)
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
@@ -114,6 +117,16 @@ int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
}
mutex_unlock(&kvm->lock);
break;
case KVM_CAP_EXIT_HYPERCALL:
if (cap->args[0] & ~KVM_EXIT_HYPERCALL_VALID_MASK)
return -EINVAL;
if (cap->args[1] || cap->args[2] || cap->args[3])
return -EINVAL;
WRITE_ONCE(kvm->arch.hypercall_exit_enabled, cap->args[0]);
r = 0;
break;
default:
r = -EINVAL;
break;
@@ -303,6 +316,9 @@ static int kvm_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_ARM_PTRAUTH_GENERIC:
r = system_has_full_ptr_auth();
break;
case KVM_CAP_EXIT_HYPERCALL:
r = KVM_EXIT_HYPERCALL_VALID_MASK;
break;
default:
r = 0;
}
@@ -327,6 +343,7 @@ static int pkvm_check_extension(struct kvm *kvm, long ext, int kvm_cap)
case KVM_CAP_MAX_VCPU_ID:
case KVM_CAP_MSI_DEVID:
case KVM_CAP_ARM_VM_IPA_SIZE:
case KVM_CAP_EXIT_HYPERCALL:
r = kvm_cap;
break;
case KVM_CAP_GUEST_DEBUG_HW_BPS:
@@ -934,6 +951,12 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
ret = kvm_handle_mmio_return(vcpu);
if (ret)
return ret;
} else if (run->exit_reason == KVM_EXIT_HYPERCALL) {
smccc_set_retval(vcpu,
vcpu->run->hypercall.ret,
vcpu->run->hypercall.args[0],
vcpu->run->hypercall.args[1],
vcpu->run->hypercall.args[2]);
}
vcpu_load(vcpu);

18
arch/arm64/kvm/hypercalls.c
View File

@@ -58,6 +58,24 @@ static void kvm_ptp_get_time(struct kvm_vcpu *vcpu, u64 *val)
val[3] = lower_32_bits(cycles);
}
static int kvm_vcpu_exit_hcall(struct kvm_vcpu *vcpu, u32 nr, u32 nr_args)
{
u64 mask = vcpu->kvm->arch.hypercall_exit_enabled;
u32 i;
if (nr_args > 6 || !(mask & BIT(nr)))
return -EINVAL;
vcpu->run->exit_reason = KVM_EXIT_HYPERCALL;
vcpu->run->hypercall.nr = nr;
for (i = 0; i < nr_args; ++i)
vcpu->run->hypercall.args[i] = vcpu_get_reg(vcpu, i + 1);
vcpu->run->hypercall.longmode = !vcpu_mode_is_32bit(vcpu);
return 0;
}
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
{
u32 func_id = smccc_get_function(vcpu);