mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 05:20:53 +07:00
e8e7fcc5e2
Currently, the kvm_psci_call() returns 'true' or 'false' based on whether the PSCI function call was handled successfully or not. This does not help us emulate system-level PSCI functions where the actual emulation work will be done by user space (QEMU or KVMTOOL). Examples of such system-level PSCI functions are: PSCI v0.2 SYSTEM_OFF and SYSTEM_RESET. This patch updates kvm_psci_call() to return three types of values: 1) > 0 (success) 2) = 0 (success but exit to user space) 3) < 0 (errors) Signed-off-by: Anup Patel <anup.patel@linaro.org> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar@linaro.org> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
170 lines
4.7 KiB
C
170 lines
4.7 KiB
C
/*
|
|
* Copyright (C) 2012 - Virtual Open Systems and Columbia University
|
|
* Author: Christoffer Dall <c.dall@virtualopensystems.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, version 2, as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include <linux/kvm.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <asm/kvm_emulate.h>
|
|
#include <asm/kvm_coproc.h>
|
|
#include <asm/kvm_mmu.h>
|
|
#include <asm/kvm_psci.h>
|
|
#include <trace/events/kvm.h>
|
|
|
|
#include "trace.h"
|
|
|
|
typedef int (*exit_handle_fn)(struct kvm_vcpu *, struct kvm_run *);
|
|
|
|
static int handle_svc_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
/* SVC called from Hyp mode should never get here */
|
|
kvm_debug("SVC called from Hyp mode shouldn't go here\n");
|
|
BUG();
|
|
return -EINVAL; /* Squash warning */
|
|
}
|
|
|
|
static int handle_hvc(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
int ret;
|
|
|
|
trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
|
|
kvm_vcpu_hvc_get_imm(vcpu));
|
|
|
|
ret = kvm_psci_call(vcpu);
|
|
if (ret < 0) {
|
|
kvm_inject_undefined(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int handle_smc(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
kvm_inject_undefined(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_pabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
/* The hypervisor should never cause aborts */
|
|
kvm_err("Prefetch Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
|
|
kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
|
|
return -EFAULT;
|
|
}
|
|
|
|
static int handle_dabt_hyp(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
/* This is either an error in the ws. code or an external abort */
|
|
kvm_err("Data Abort taken from Hyp mode at %#08lx (HSR: %#08x)\n",
|
|
kvm_vcpu_get_hfar(vcpu), kvm_vcpu_get_hsr(vcpu));
|
|
return -EFAULT;
|
|
}
|
|
|
|
/**
|
|
* kvm_handle_wfx - handle a WFI or WFE instructions trapped in guests
|
|
* @vcpu: the vcpu pointer
|
|
* @run: the kvm_run structure pointer
|
|
*
|
|
* WFE: Yield the CPU and come back to this vcpu when the scheduler
|
|
* decides to.
|
|
* WFI: Simply call kvm_vcpu_block(), which will halt execution of
|
|
* world-switches and schedule other host processes until there is an
|
|
* incoming IRQ or FIQ to the VM.
|
|
*/
|
|
static int kvm_handle_wfx(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
trace_kvm_wfi(*vcpu_pc(vcpu));
|
|
if (kvm_vcpu_get_hsr(vcpu) & HSR_WFI_IS_WFE)
|
|
kvm_vcpu_on_spin(vcpu);
|
|
else
|
|
kvm_vcpu_block(vcpu);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static exit_handle_fn arm_exit_handlers[] = {
|
|
[HSR_EC_WFI] = kvm_handle_wfx,
|
|
[HSR_EC_CP15_32] = kvm_handle_cp15_32,
|
|
[HSR_EC_CP15_64] = kvm_handle_cp15_64,
|
|
[HSR_EC_CP14_MR] = kvm_handle_cp14_access,
|
|
[HSR_EC_CP14_LS] = kvm_handle_cp14_load_store,
|
|
[HSR_EC_CP14_64] = kvm_handle_cp14_access,
|
|
[HSR_EC_CP_0_13] = kvm_handle_cp_0_13_access,
|
|
[HSR_EC_CP10_ID] = kvm_handle_cp10_id,
|
|
[HSR_EC_SVC_HYP] = handle_svc_hyp,
|
|
[HSR_EC_HVC] = handle_hvc,
|
|
[HSR_EC_SMC] = handle_smc,
|
|
[HSR_EC_IABT] = kvm_handle_guest_abort,
|
|
[HSR_EC_IABT_HYP] = handle_pabt_hyp,
|
|
[HSR_EC_DABT] = kvm_handle_guest_abort,
|
|
[HSR_EC_DABT_HYP] = handle_dabt_hyp,
|
|
};
|
|
|
|
static exit_handle_fn kvm_get_exit_handler(struct kvm_vcpu *vcpu)
|
|
{
|
|
u8 hsr_ec = kvm_vcpu_trap_get_class(vcpu);
|
|
|
|
if (hsr_ec >= ARRAY_SIZE(arm_exit_handlers) ||
|
|
!arm_exit_handlers[hsr_ec]) {
|
|
kvm_err("Unknown exception class: hsr: %#08x\n",
|
|
(unsigned int)kvm_vcpu_get_hsr(vcpu));
|
|
BUG();
|
|
}
|
|
|
|
return arm_exit_handlers[hsr_ec];
|
|
}
|
|
|
|
/*
|
|
* Return > 0 to return to guest, < 0 on error, 0 (and set exit_reason) on
|
|
* proper exit to userspace.
|
|
*/
|
|
int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
|
|
int exception_index)
|
|
{
|
|
exit_handle_fn exit_handler;
|
|
|
|
switch (exception_index) {
|
|
case ARM_EXCEPTION_IRQ:
|
|
return 1;
|
|
case ARM_EXCEPTION_UNDEFINED:
|
|
kvm_err("Undefined exception in Hyp mode at: %#08lx\n",
|
|
kvm_vcpu_get_hyp_pc(vcpu));
|
|
BUG();
|
|
panic("KVM: Hypervisor undefined exception!\n");
|
|
case ARM_EXCEPTION_DATA_ABORT:
|
|
case ARM_EXCEPTION_PREF_ABORT:
|
|
case ARM_EXCEPTION_HVC:
|
|
/*
|
|
* See ARM ARM B1.14.1: "Hyp traps on instructions
|
|
* that fail their condition code check"
|
|
*/
|
|
if (!kvm_condition_valid(vcpu)) {
|
|
kvm_skip_instr(vcpu, kvm_vcpu_trap_il_is32bit(vcpu));
|
|
return 1;
|
|
}
|
|
|
|
exit_handler = kvm_get_exit_handler(vcpu);
|
|
|
|
return exit_handler(vcpu, run);
|
|
default:
|
|
kvm_pr_unimpl("Unsupported exception type: %d",
|
|
exception_index);
|
|
run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
return 0;
|
|
}
|
|
}
|