a231723cc0
The current Xen console driver is crashing very quickly when using it on an ARM guest. This is because the console lock is recursive and it may lead to recursion on the tty lock and/or corrupt the ring pointer. Furthermore, the console lock is not always taken where it should be and has to be released too early because of the way the console has been designed. Over the years, code has been modified to support various new features but the driver has not been reworked. This new driver has been rewritten with the idea of only having a small set of specific function to write either via the shared ring or the hypercall interface. Note that HVM support has been left aside for now because it requires additional features which are not yet supported. A follow-up patch will be sent with HVM guest support. List of items that may be good to have but not mandatory: - Avoid to flush for each character written when using the tty - Support multiple consoles Submitted by: Julien Grall <julien.grall@citrix.com> Reviewed by: royger Differential Revision: https://reviews.freebsd.org/D3698 Sponsored by: Citrix Systems R&D
155 lines
3.3 KiB
C
155 lines
3.3 KiB
C
/******************************************************************************
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* hypervisor.h
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*
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* Linux-specific hypervisor handling.
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*
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* Copyright (c) 2002, K A Fraser
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*
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* $FreeBSD$
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*/
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#ifndef __XEN_HYPERVISOR_H__
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#define __XEN_HYPERVISOR_H__
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#ifdef XENHVM
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#define is_running_on_xen() (HYPERVISOR_shared_info != NULL)
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#else
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#define is_running_on_xen() 1
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#endif
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#ifdef PAE
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#ifndef CONFIG_X86_PAE
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#define CONFIG_X86_PAE
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#endif
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#endif
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#include <sys/cdefs.h>
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#include <sys/systm.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/platform.h>
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#include <xen/interface/event_channel.h>
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#include <xen/interface/physdev.h>
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#include <xen/interface/sched.h>
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#include <xen/interface/callback.h>
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#include <xen/interface/memory.h>
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#include <machine/xen/hypercall.h>
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#if defined(__amd64__)
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#define MULTI_UVMFLAGS_INDEX 2
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#define MULTI_UVMDOMID_INDEX 3
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#else
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#define MULTI_UVMFLAGS_INDEX 3
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#define MULTI_UVMDOMID_INDEX 4
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#endif
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#ifdef CONFIG_XEN_PRIVILEGED_GUEST
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#define is_initial_xendomain() (xen_start_info->flags & SIF_INITDOMAIN)
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#else
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#define is_initial_xendomain() 0
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#endif
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extern start_info_t *xen_start_info;
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extern uint64_t get_system_time(int ticks);
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static inline int
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HYPERVISOR_console_write(const char *str, int count)
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{
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return HYPERVISOR_console_io(CONSOLEIO_write, count, str);
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}
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static inline void HYPERVISOR_crash(void) __dead2;
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static inline int
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HYPERVISOR_yield(void)
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{
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int rc = HYPERVISOR_sched_op(SCHEDOP_yield, NULL);
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#if CONFIG_XEN_COMPAT <= 0x030002
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if (rc == -ENOXENSYS)
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rc = HYPERVISOR_sched_op_compat(SCHEDOP_yield, 0);
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#endif
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return (rc);
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}
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static inline int
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HYPERVISOR_block(
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void)
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{
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int rc = HYPERVISOR_sched_op(SCHEDOP_block, NULL);
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#if CONFIG_XEN_COMPAT <= 0x030002
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if (rc == -ENOXENSYS)
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rc = HYPERVISOR_sched_op_compat(SCHEDOP_block, 0);
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#endif
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return (rc);
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}
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static inline void
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HYPERVISOR_shutdown(unsigned int reason)
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{
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struct sched_shutdown sched_shutdown = {
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.reason = reason
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};
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HYPERVISOR_sched_op(SCHEDOP_shutdown, &sched_shutdown);
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#if CONFIG_XEN_COMPAT <= 0x030002
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HYPERVISOR_sched_op_compat(SCHEDOP_shutdown, reason);
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#endif
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}
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static inline void
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HYPERVISOR_crash(void)
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{
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HYPERVISOR_shutdown(SHUTDOWN_crash);
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/* NEVER REACHED */
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for (;;) ; /* eliminate noreturn error */
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}
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/* Transfer control to hypervisor until an event is detected on one */
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/* of the specified ports or the specified number of ticks elapse */
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static inline int
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HYPERVISOR_poll(
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evtchn_port_t *ports, unsigned int nr_ports, int ticks)
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{
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int rc;
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struct sched_poll sched_poll = {
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.nr_ports = nr_ports,
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.timeout = get_system_time(ticks)
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};
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set_xen_guest_handle(sched_poll.ports, ports);
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rc = HYPERVISOR_sched_op(SCHEDOP_poll, &sched_poll);
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#if CONFIG_XEN_COMPAT <= 0x030002
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if (rc == -ENOXENSYS)
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rc = HYPERVISOR_sched_op_compat(SCHEDOP_yield, 0);
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#endif
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return (rc);
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}
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static inline void
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MULTI_update_va_mapping(
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multicall_entry_t *mcl, unsigned long va,
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uint64_t new_val, unsigned long flags)
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{
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mcl->op = __HYPERVISOR_update_va_mapping;
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mcl->args[0] = va;
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#if defined(__amd64__)
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mcl->args[1] = new_val;
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#elif defined(PAE)
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mcl->args[1] = (uint32_t)(new_val & 0xffffffff) ;
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mcl->args[2] = (uint32_t)(new_val >> 32);
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#else
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mcl->args[1] = new_val;
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mcl->args[2] = 0;
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#endif
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mcl->args[MULTI_UVMFLAGS_INDEX] = flags;
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}
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#endif /* __XEN_HYPERVISOR_H__ */
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