mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-26 07:10:51 +07:00
24a7f67575
Currently, kvmtool unconditionally declares that HVC should be used to call PSCI, so the function numbers in the DT tell the guest nothing about the function ID namespace or calling convention for SMC. We already assume that the guest will examine and honour the DT, since there is no way it could possibly guess the KVM-specific PSCI function IDs otherwise. So let's not encourage guests to violate what's specified in the DT by using SMC to make the call. [ Modified to apply to top of kvm/arm tree - Christoffer ] Signed-off-by: Dave P Martin <Dave.Martin@arm.com> Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
162 lines
4.6 KiB
C
162 lines
4.6 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"
|
|
|
|
#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)
|
|
{
|
|
trace_kvm_hvc(*vcpu_pc(vcpu), *vcpu_reg(vcpu, 0),
|
|
kvm_vcpu_hvc_get_imm(vcpu));
|
|
|
|
if (kvm_psci_call(vcpu))
|
|
return 1;
|
|
|
|
kvm_inject_undefined(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
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_wfi - handle a wait-for-interrupts instruction executed by a guest
|
|
* @vcpu: the vcpu pointer
|
|
* @run: the kvm_run structure pointer
|
|
*
|
|
* Simply sets the wait_for_interrupts flag on the vcpu structure, 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_wfi(struct kvm_vcpu *vcpu, struct kvm_run *run)
|
|
{
|
|
trace_kvm_wfi(*vcpu_pc(vcpu));
|
|
kvm_vcpu_block(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static exit_handle_fn arm_exit_handlers[] = {
|
|
[HSR_EC_WFI] = kvm_handle_wfi,
|
|
[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;
|
|
}
|
|
}
|