mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-14 04:26:45 +00:00
b48c1a45a1
This provides a mechanism for querying which paravirtualized time features are available in this hypervisor. Also add the header file which defines the ABI for the paravirtualized time features we're about to add. Signed-off-by: Steven Price <steven.price@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
// Copyright (C) 2019 Arm Ltd.
|
|
|
|
#include <linux/arm-smccc.h>
|
|
#include <linux/kvm_host.h>
|
|
|
|
#include <asm/kvm_emulate.h>
|
|
|
|
#include <kvm/arm_hypercalls.h>
|
|
#include <kvm/arm_psci.h>
|
|
|
|
int kvm_hvc_call_handler(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 func_id = smccc_get_function(vcpu);
|
|
long val = SMCCC_RET_NOT_SUPPORTED;
|
|
u32 feature;
|
|
|
|
switch (func_id) {
|
|
case ARM_SMCCC_VERSION_FUNC_ID:
|
|
val = ARM_SMCCC_VERSION_1_1;
|
|
break;
|
|
case ARM_SMCCC_ARCH_FEATURES_FUNC_ID:
|
|
feature = smccc_get_arg1(vcpu);
|
|
switch (feature) {
|
|
case ARM_SMCCC_ARCH_WORKAROUND_1:
|
|
switch (kvm_arm_harden_branch_predictor()) {
|
|
case KVM_BP_HARDEN_UNKNOWN:
|
|
break;
|
|
case KVM_BP_HARDEN_WA_NEEDED:
|
|
val = SMCCC_RET_SUCCESS;
|
|
break;
|
|
case KVM_BP_HARDEN_NOT_REQUIRED:
|
|
val = SMCCC_RET_NOT_REQUIRED;
|
|
break;
|
|
}
|
|
break;
|
|
case ARM_SMCCC_ARCH_WORKAROUND_2:
|
|
switch (kvm_arm_have_ssbd()) {
|
|
case KVM_SSBD_FORCE_DISABLE:
|
|
case KVM_SSBD_UNKNOWN:
|
|
break;
|
|
case KVM_SSBD_KERNEL:
|
|
val = SMCCC_RET_SUCCESS;
|
|
break;
|
|
case KVM_SSBD_FORCE_ENABLE:
|
|
case KVM_SSBD_MITIGATED:
|
|
val = SMCCC_RET_NOT_REQUIRED;
|
|
break;
|
|
}
|
|
break;
|
|
case ARM_SMCCC_HV_PV_TIME_FEATURES:
|
|
val = SMCCC_RET_SUCCESS;
|
|
break;
|
|
}
|
|
break;
|
|
case ARM_SMCCC_HV_PV_TIME_FEATURES:
|
|
val = kvm_hypercall_pv_features(vcpu);
|
|
break;
|
|
default:
|
|
return kvm_psci_call(vcpu);
|
|
}
|
|
|
|
smccc_set_retval(vcpu, val, 0, 0, 0);
|
|
return 1;
|
|
}
|