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/* SPDX-License-Identifier: GPL-2.0-or-later */
/******************************************************************************
* arch/hvm/hypercall.c
*
* HVM hypercall dispatching routines
*
* Copyright (c) 2017 Citrix Systems Ltd.
*/
#include <xen/lib.h>
#include <xen/hypercall.h>
#include <xen/ioreq.h>
#include <xen/nospec.h>
#include <asm/hvm/emulate.h>
#include <asm/hvm/support.h>
#include <asm/hvm/viridian.h>
#include <asm/multicall.h>
#include <public/hvm/hvm_op.h>
#include <public/hvm/params.h>
long hvm_memory_op(unsigned long cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
long rc;
switch ( cmd & MEMOP_CMD_MASK )
{
case XENMEM_machine_memory_map:
case XENMEM_machphys_mapping:
return -ENOSYS;
}
if ( !current->hcall_compat )
rc = do_memory_op(cmd, arg);
else
rc = compat_memory_op(cmd, arg);
return rc;
}
#ifdef CONFIG_GRANT_TABLE
long hvm_grant_table_op(
unsigned int cmd, XEN_GUEST_HANDLE_PARAM(void) uop, unsigned int count)
{
switch ( cmd )
{
case GNTTABOP_query_size:
case GNTTABOP_setup_table:
case GNTTABOP_set_version:
case GNTTABOP_get_version:
case GNTTABOP_copy:
case GNTTABOP_map_grant_ref:
case GNTTABOP_unmap_grant_ref:
case GNTTABOP_swap_grant_ref:
break;
default: /* All other commands need auditing. */
return -ENOSYS;
}
if ( !current->hcall_compat )
return do_grant_table_op(cmd, uop, count);
else
return compat_grant_table_op(cmd, uop, count);
}
#endif
long hvm_physdev_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
{
const struct vcpu *curr = current;
const struct domain *currd = curr->domain;
switch ( cmd )
{
case PHYSDEVOP_map_pirq:
case PHYSDEVOP_unmap_pirq:
case PHYSDEVOP_eoi:
case PHYSDEVOP_irq_status_query:
case PHYSDEVOP_get_free_pirq:
if ( !has_pirq(currd) )
return -ENOSYS;
break;
case PHYSDEVOP_pci_mmcfg_reserved:
case PHYSDEVOP_pci_device_add:
case PHYSDEVOP_pci_device_remove:
case PHYSDEVOP_dbgp_op:
if ( !is_hardware_domain(currd) )
return -ENOSYS;
break;
default:
return -ENOSYS;
}
if ( !curr->hcall_compat )
return do_physdev_op(cmd, arg);
else
return compat_physdev_op(cmd, arg);
}
int hvm_hypercall(struct cpu_user_regs *regs)
{
struct vcpu *curr = current;
struct domain *currd = curr->domain;
int mode = hvm_guest_x86_mode(curr);
unsigned long eax = regs->eax;
unsigned int token;
switch ( mode )
{
case 8:
eax = regs->rax;
/* Fallthrough to permission check. */
case 4:
case 2:
if ( currd->arch.monitor.guest_request_userspace_enabled &&
eax == __HYPERVISOR_hvm_op &&
(mode == 8 ? regs->rdi : regs->ebx) == HVMOP_guest_request_vm_event )
break;
if ( unlikely(hvm_get_cpl(curr)) )
{
default:
regs->rax = -EPERM;
return HVM_HCALL_completed;
}
case 0:
break;
}
if ( (eax & 0x80000000) && is_viridian_domain(currd) )
{
int ret;
/* See comment below. */
token = hvmemul_cache_disable(curr);
ret = viridian_hypercall(regs);
hvmemul_cache_restore(curr, token);
return ret;
}
/*
* Caching is intended for instruction emulation only. Disable it
* for any accesses by hypercall argument copy-in / copy-out.
*/
token = hvmemul_cache_disable(curr);
curr->hcall_preempted = false;
if ( mode == 8 )
{
HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%lu(%lx, %lx, %lx, %lx, %lx)",
eax, regs->rdi, regs->rsi, regs->rdx, regs->r10, regs->r8);
call_handlers_hvm64(eax, regs->rax, regs->rdi, regs->rsi, regs->rdx,
regs->r10, regs->r8);
if ( !curr->hcall_preempted && regs->rax != -ENOSYS )
clobber_regs(regs, eax, hvm, 64);
}
else
{
HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%lu(%x, %x, %x, %x, %x)", eax,
regs->ebx, regs->ecx, regs->edx, regs->esi, regs->edi);
curr->hcall_compat = true;
call_handlers_hvm32(eax, regs->eax, regs->ebx, regs->ecx, regs->edx,
regs->esi, regs->edi);
curr->hcall_compat = false;
if ( !curr->hcall_preempted && regs->eax != -ENOSYS )
clobber_regs(regs, eax, hvm, 32);
}
hvmemul_cache_restore(curr, token);
HVM_DBG_LOG(DBG_LEVEL_HCALL, "hcall%lu -> %lx", eax, regs->rax);
if ( unlikely(curr->mapcache_invalidate) )
{
curr->mapcache_invalidate = false;
ioreq_signal_mapcache_invalidate();
}
perfc_incra(hypercalls, eax);
return curr->hcall_preempted ? HVM_HCALL_preempted : HVM_HCALL_completed;
}
enum mc_disposition hvm_do_multicall_call(struct mc_state *state)
{
struct vcpu *curr = current;
if ( hvm_guest_x86_mode(curr) == 8 )
{
struct multicall_entry *call = &state->call;
call_handlers_hvm64(call->op, call->result, call->args[0], call->args[1],
call->args[2], call->args[3], call->args[4]);
}
else
{
struct compat_multicall_entry *call = &state->compat_call;
call_handlers_hvm32(call->op, call->result, call->args[0], call->args[1],
call->args[2], call->args[3], call->args[4]);
}
return !hvm_get_cpl(curr) ? mc_continue : mc_preempt;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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