include/xen/interface/hvm/params.h

/* SPDX-License-Identifier: MIT
 *
 * params.h
 *
 * HVM parameters. HVM (Hardware Virtual Machine) is the type of instance
 * that mimics bare-metal server setup which provides better hardware
 * isolation.
 */

#ifndef __XEN_PUBLIC_HVM_PARAMS_H__
#define __XEN_PUBLIC_HVM_PARAMS_H__

#include <xen/interface/hvm/hvm_op.h>

/*
 * Parameter space for HVMOP_{set,get}_param.
 */

#define HVM_PARAM_CALLBACK_IRQ 0
/*
 * How should CPU0 event-channel notifications be delivered?
 *
 * If val == 0 then CPU0 event-channel notifications are not delivered.
 * If val != 0, val[63:56] encodes the type, as follows:
 */

#define HVM_PARAM_CALLBACK_TYPE_GSI      0
/*
 * val[55:0] is a delivery GSI.  GSI 0 cannot be used, as it aliases val == 0,
 * and disables all notifications.
 */

#define HVM_PARAM_CALLBACK_TYPE_PCI_INTX 1
/*
 * val[55:0] is a delivery PCI INTx line:
 * Domain = val[47:32], Bus = val[31:16] DevFn = val[15:8], IntX = val[1:0]
 */

#if defined(__i386__) || defined(__x86_64__)
#define HVM_PARAM_CALLBACK_TYPE_VECTOR   2
/*
 * val[7:0] is a vector number.  Check for XENFEAT_hvm_callback_vector to know
 * if this delivery method is available.
 */
#elif defined(__arm__) || defined(__aarch64__)
#define HVM_PARAM_CALLBACK_TYPE_PPI      2
/*
 * val[55:16] needs to be zero.
 * val[15:8] is interrupt flag of the PPI used by event-channel:
 *  bit 8: the PPI is edge(1) or level(0) triggered
 *  bit 9: the PPI is active low(1) or high(0)
 * val[7:0] is a PPI number used by event-channel.
 * This is only used by ARM/ARM64 and masking/eoi the interrupt associated to
 * the notification is handled by the interrupt controller.
 */
#endif

#define HVM_PARAM_STORE_PFN    1
#define HVM_PARAM_STORE_EVTCHN 2

#define HVM_PARAM_PAE_ENABLED  4

#define HVM_PARAM_IOREQ_PFN    5

#define HVM_PARAM_BUFIOREQ_PFN 6

/*
 * Set mode for virtual timers (currently x86 only):
 *  delay_for_missed_ticks (default):
 *   Do not advance a vcpu's time beyond the correct delivery time for
 *   interrupts that have been missed due to preemption. Deliver missed
 *   interrupts when the vcpu is rescheduled and advance the vcpu's virtual
 *   time stepwise for each one.
 *  no_delay_for_missed_ticks:
 *   As above, missed interrupts are delivered, but guest time always tracks
 *   wallclock (i.e., real) time while doing so.
 *  no_missed_ticks_pending:
 *   No missed interrupts are held pending. Instead, to ensure ticks are
 *   delivered at some non-zero rate, if we detect missed ticks then the
 *   internal tick alarm is not disabled if the VCPU is preempted during the
 *   next tick period.
 *  one_missed_tick_pending:
 *   Missed interrupts are collapsed together and delivered as one 'late tick'.
 *   Guest time always tracks wallclock (i.e., real) time.
 */
#define HVM_PARAM_TIMER_MODE   10
#define HVMPTM_delay_for_missed_ticks    0
#define HVMPTM_no_delay_for_missed_ticks 1
#define HVMPTM_no_missed_ticks_pending   2
#define HVMPTM_one_missed_tick_pending   3

/* Boolean: Enable virtual HPET (high-precision event timer)? (x86-only) */
#define HVM_PARAM_HPET_ENABLED 11

/* Identity-map page directory used by Intel EPT when CR0.PG=0. */
#define HVM_PARAM_IDENT_PT     12

/* Device Model domain, defaults to 0. */
#define HVM_PARAM_DM_DOMAIN    13

/* ACPI S state: currently support S0 and S3 on x86. */
#define HVM_PARAM_ACPI_S_STATE 14

/* TSS used on Intel when CR0.PE=0. */
#define HVM_PARAM_VM86_TSS     15

/* Boolean: Enable aligning all periodic vpts to reduce interrupts */
#define HVM_PARAM_VPT_ALIGN    16

/* Console debug shared memory ring and event channel */
#define HVM_PARAM_CONSOLE_PFN    17
#define HVM_PARAM_CONSOLE_EVTCHN 18

#define HVM_NR_PARAMS          19

#endif /* __XEN_PUBLIC_HVM_PARAMS_H__ */