mirror of https://github.com/xemu-project/xemu.git
xen: Initialize event channels and io rings
Open and bind event channels; map ioreq and buffered ioreq rings. Signed-off-by: Arun Sharma <arun.sharma@intel.com> Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com> Acked-by: Alexander Graf <agraf@suse.de> Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Arun Sharma
Alexander Graf
parent
1291eb3540
commit
9ce94e7c8a
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@ -107,4 +107,6 @@ static inline int xc_fd(xc_interface *xen_xc)
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}
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#endif
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void destroy_hvm_domain(void);
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#endif /* QEMU_HW_XEN_COMMON_H */
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417
xen-all.c
417
xen-all.c
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@ -6,6 +6,8 @@
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*
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*/
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#include <sys/mman.h>
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#include "hw/pci.h"
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#include "hw/xen_common.h"
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#include "hw/xen_backend.h"
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@ -13,6 +15,58 @@
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#include "xen-mapcache.h"
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#include "trace.h"
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#include <xen/hvm/ioreq.h>
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#include <xen/hvm/params.h>
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//#define DEBUG_XEN
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#ifdef DEBUG_XEN
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#define DPRINTF(fmt, ...) \
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do { fprintf(stderr, "xen: " fmt, ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) \
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do { } while (0)
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#endif
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/* Compatibility with older version */
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#if __XEN_LATEST_INTERFACE_VERSION__ < 0x0003020a
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static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
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{
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return shared_page->vcpu_iodata[i].vp_eport;
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}
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static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
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{
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return &shared_page->vcpu_iodata[vcpu].vp_ioreq;
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}
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# define FMT_ioreq_size PRIx64
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#else
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static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
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{
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return shared_page->vcpu_ioreq[i].vp_eport;
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}
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static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
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{
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return &shared_page->vcpu_ioreq[vcpu];
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}
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# define FMT_ioreq_size "u"
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#endif
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#define BUFFER_IO_MAX_DELAY 100
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typedef struct XenIOState {
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shared_iopage_t *shared_page;
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buffered_iopage_t *buffered_io_page;
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QEMUTimer *buffered_io_timer;
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/* the evtchn port for polling the notification, */
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evtchn_port_t *ioreq_local_port;
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/* the evtchn fd for polling */
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XenEvtchn xce_handle;
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/* which vcpu we are serving */
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int send_vcpu;
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Notifier exit;
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} XenIOState;
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/* Xen specific function for piix pci */
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int xen_pci_slot_get_pirq(PCIDevice *pci_dev, int irq_num)
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@ -133,8 +187,304 @@ void xen_vcpu_init(void)
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}
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}
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/* get the ioreq packets from share mem */
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static ioreq_t *cpu_get_ioreq_from_shared_memory(XenIOState *state, int vcpu)
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{
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ioreq_t *req = xen_vcpu_ioreq(state->shared_page, vcpu);
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if (req->state != STATE_IOREQ_READY) {
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DPRINTF("I/O request not ready: "
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"%x, ptr: %x, port: %"PRIx64", "
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"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
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req->state, req->data_is_ptr, req->addr,
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req->data, req->count, req->size);
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return NULL;
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}
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xen_rmb(); /* see IOREQ_READY /then/ read contents of ioreq */
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req->state = STATE_IOREQ_INPROCESS;
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return req;
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}
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/* use poll to get the port notification */
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/* ioreq_vec--out,the */
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/* retval--the number of ioreq packet */
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static ioreq_t *cpu_get_ioreq(XenIOState *state)
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{
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int i;
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evtchn_port_t port;
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port = xc_evtchn_pending(state->xce_handle);
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if (port != -1) {
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for (i = 0; i < smp_cpus; i++) {
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if (state->ioreq_local_port[i] == port) {
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break;
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}
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}
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if (i == smp_cpus) {
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hw_error("Fatal error while trying to get io event!\n");
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}
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/* unmask the wanted port again */
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xc_evtchn_unmask(state->xce_handle, port);
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/* get the io packet from shared memory */
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state->send_vcpu = i;
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return cpu_get_ioreq_from_shared_memory(state, i);
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}
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/* read error or read nothing */
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return NULL;
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}
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static uint32_t do_inp(pio_addr_t addr, unsigned long size)
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{
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switch (size) {
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case 1:
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return cpu_inb(addr);
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case 2:
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return cpu_inw(addr);
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case 4:
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return cpu_inl(addr);
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default:
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hw_error("inp: bad size: %04"FMT_pioaddr" %lx", addr, size);
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}
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}
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static void do_outp(pio_addr_t addr,
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unsigned long size, uint32_t val)
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{
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switch (size) {
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case 1:
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return cpu_outb(addr, val);
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case 2:
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return cpu_outw(addr, val);
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case 4:
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return cpu_outl(addr, val);
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default:
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hw_error("outp: bad size: %04"FMT_pioaddr" %lx", addr, size);
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}
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}
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static void cpu_ioreq_pio(ioreq_t *req)
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{
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int i, sign;
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sign = req->df ? -1 : 1;
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if (req->dir == IOREQ_READ) {
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if (!req->data_is_ptr) {
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req->data = do_inp(req->addr, req->size);
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} else {
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uint32_t tmp;
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for (i = 0; i < req->count; i++) {
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tmp = do_inp(req->addr, req->size);
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cpu_physical_memory_write(req->data + (sign * i * req->size),
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(uint8_t *) &tmp, req->size);
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}
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}
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} else if (req->dir == IOREQ_WRITE) {
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if (!req->data_is_ptr) {
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do_outp(req->addr, req->size, req->data);
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} else {
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for (i = 0; i < req->count; i++) {
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uint32_t tmp = 0;
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cpu_physical_memory_read(req->data + (sign * i * req->size),
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(uint8_t*) &tmp, req->size);
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do_outp(req->addr, req->size, tmp);
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}
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}
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}
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}
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static void cpu_ioreq_move(ioreq_t *req)
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{
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int i, sign;
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sign = req->df ? -1 : 1;
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if (!req->data_is_ptr) {
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if (req->dir == IOREQ_READ) {
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for (i = 0; i < req->count; i++) {
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cpu_physical_memory_read(req->addr + (sign * i * req->size),
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(uint8_t *) &req->data, req->size);
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}
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} else if (req->dir == IOREQ_WRITE) {
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for (i = 0; i < req->count; i++) {
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cpu_physical_memory_write(req->addr + (sign * i * req->size),
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(uint8_t *) &req->data, req->size);
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}
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}
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} else {
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target_ulong tmp;
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if (req->dir == IOREQ_READ) {
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for (i = 0; i < req->count; i++) {
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cpu_physical_memory_read(req->addr + (sign * i * req->size),
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(uint8_t*) &tmp, req->size);
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cpu_physical_memory_write(req->data + (sign * i * req->size),
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(uint8_t*) &tmp, req->size);
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}
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} else if (req->dir == IOREQ_WRITE) {
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for (i = 0; i < req->count; i++) {
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cpu_physical_memory_read(req->data + (sign * i * req->size),
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(uint8_t*) &tmp, req->size);
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cpu_physical_memory_write(req->addr + (sign * i * req->size),
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(uint8_t*) &tmp, req->size);
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}
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}
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}
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}
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static void handle_ioreq(ioreq_t *req)
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{
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if (!req->data_is_ptr && (req->dir == IOREQ_WRITE) &&
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(req->size < sizeof (target_ulong))) {
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req->data &= ((target_ulong) 1 << (8 * req->size)) - 1;
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}
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switch (req->type) {
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case IOREQ_TYPE_PIO:
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cpu_ioreq_pio(req);
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break;
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case IOREQ_TYPE_COPY:
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cpu_ioreq_move(req);
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break;
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case IOREQ_TYPE_TIMEOFFSET:
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break;
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case IOREQ_TYPE_INVALIDATE:
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qemu_invalidate_map_cache();
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break;
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default:
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hw_error("Invalid ioreq type 0x%x\n", req->type);
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}
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}
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static void handle_buffered_iopage(XenIOState *state)
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{
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buf_ioreq_t *buf_req = NULL;
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ioreq_t req;
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int qw;
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if (!state->buffered_io_page) {
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return;
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}
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while (state->buffered_io_page->read_pointer != state->buffered_io_page->write_pointer) {
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buf_req = &state->buffered_io_page->buf_ioreq[
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state->buffered_io_page->read_pointer % IOREQ_BUFFER_SLOT_NUM];
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req.size = 1UL << buf_req->size;
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req.count = 1;
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req.addr = buf_req->addr;
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req.data = buf_req->data;
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req.state = STATE_IOREQ_READY;
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req.dir = buf_req->dir;
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req.df = 1;
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req.type = buf_req->type;
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req.data_is_ptr = 0;
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qw = (req.size == 8);
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if (qw) {
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buf_req = &state->buffered_io_page->buf_ioreq[
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(state->buffered_io_page->read_pointer + 1) % IOREQ_BUFFER_SLOT_NUM];
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req.data |= ((uint64_t)buf_req->data) << 32;
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}
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handle_ioreq(&req);
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xen_mb();
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state->buffered_io_page->read_pointer += qw ? 2 : 1;
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}
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}
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static void handle_buffered_io(void *opaque)
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{
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XenIOState *state = opaque;
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handle_buffered_iopage(state);
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qemu_mod_timer(state->buffered_io_timer,
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BUFFER_IO_MAX_DELAY + qemu_get_clock_ms(rt_clock));
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}
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static void cpu_handle_ioreq(void *opaque)
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{
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XenIOState *state = opaque;
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ioreq_t *req = cpu_get_ioreq(state);
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handle_buffered_iopage(state);
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if (req) {
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handle_ioreq(req);
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if (req->state != STATE_IOREQ_INPROCESS) {
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fprintf(stderr, "Badness in I/O request ... not in service?!: "
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"%x, ptr: %x, port: %"PRIx64", "
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"data: %"PRIx64", count: %" FMT_ioreq_size ", size: %" FMT_ioreq_size "\n",
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req->state, req->data_is_ptr, req->addr,
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req->data, req->count, req->size);
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destroy_hvm_domain();
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return;
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}
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xen_wmb(); /* Update ioreq contents /then/ update state. */
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/*
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* We do this before we send the response so that the tools
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* have the opportunity to pick up on the reset before the
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* guest resumes and does a hlt with interrupts disabled which
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* causes Xen to powerdown the domain.
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*/
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if (vm_running) {
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if (qemu_shutdown_requested_get()) {
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destroy_hvm_domain();
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}
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if (qemu_reset_requested_get()) {
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qemu_system_reset();
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}
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}
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req->state = STATE_IORESP_READY;
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xc_evtchn_notify(state->xce_handle, state->ioreq_local_port[state->send_vcpu]);
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}
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}
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static void xen_main_loop_prepare(XenIOState *state)
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{
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int evtchn_fd = -1;
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if (state->xce_handle != XC_HANDLER_INITIAL_VALUE) {
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evtchn_fd = xc_evtchn_fd(state->xce_handle);
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}
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state->buffered_io_timer = qemu_new_timer_ms(rt_clock, handle_buffered_io,
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state);
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qemu_mod_timer(state->buffered_io_timer, qemu_get_clock_ms(rt_clock));
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if (evtchn_fd != -1) {
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qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
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}
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}
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/* Initialise Xen */
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static void xen_vm_change_state_handler(void *opaque, int running, int reason)
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{
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XenIOState *state = opaque;
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if (running) {
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xen_main_loop_prepare(state);
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}
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}
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static void xen_exit_notifier(Notifier *n)
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{
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XenIOState *state = container_of(n, XenIOState, exit);
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xc_evtchn_close(state->xce_handle);
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}
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int xen_init(void)
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{
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xen_xc = xen_xc_interface_open(0, 0, 0);
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@ -148,9 +498,76 @@ int xen_init(void)
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int xen_hvm_init(void)
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{
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int i, rc;
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unsigned long ioreq_pfn;
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XenIOState *state;
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state = qemu_mallocz(sizeof (XenIOState));
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state->xce_handle = xen_xc_evtchn_open(NULL, 0);
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if (state->xce_handle == XC_HANDLER_INITIAL_VALUE) {
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perror("xen: event channel open");
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return -errno;
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}
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state->exit.notify = xen_exit_notifier;
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qemu_add_exit_notifier(&state->exit);
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xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_IOREQ_PFN, &ioreq_pfn);
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DPRINTF("shared page at pfn %lx\n", ioreq_pfn);
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state->shared_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
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PROT_READ|PROT_WRITE, ioreq_pfn);
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if (state->shared_page == NULL) {
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hw_error("map shared IO page returned error %d handle=" XC_INTERFACE_FMT,
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errno, xen_xc);
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}
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xc_get_hvm_param(xen_xc, xen_domid, HVM_PARAM_BUFIOREQ_PFN, &ioreq_pfn);
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DPRINTF("buffered io page at pfn %lx\n", ioreq_pfn);
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state->buffered_io_page = xc_map_foreign_range(xen_xc, xen_domid, XC_PAGE_SIZE,
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PROT_READ|PROT_WRITE, ioreq_pfn);
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if (state->buffered_io_page == NULL) {
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hw_error("map buffered IO page returned error %d", errno);
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}
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state->ioreq_local_port = qemu_mallocz(smp_cpus * sizeof (evtchn_port_t));
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/* FIXME: how about if we overflow the page here? */
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for (i = 0; i < smp_cpus; i++) {
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rc = xc_evtchn_bind_interdomain(state->xce_handle, xen_domid,
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xen_vcpu_eport(state->shared_page, i));
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if (rc == -1) {
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fprintf(stderr, "bind interdomain ioctl error %d\n", errno);
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return -1;
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}
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state->ioreq_local_port[i] = rc;
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}
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/* Init RAM management */
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qemu_map_cache_init();
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xen_ram_init(ram_size);
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qemu_add_vm_change_state_handler(xen_vm_change_state_handler, state);
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return 0;
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}
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void destroy_hvm_domain(void)
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{
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XenXC xc_handle;
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int sts;
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xc_handle = xen_xc_interface_open(0, 0, 0);
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if (xc_handle == XC_HANDLER_INITIAL_VALUE) {
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fprintf(stderr, "Cannot acquire xenctrl handle\n");
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} else {
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sts = xc_domain_shutdown(xc_handle, xen_domid, SHUTDOWN_poweroff);
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if (sts != 0) {
|
||||
fprintf(stderr, "? xc_domain_shutdown failed to issue poweroff, "
|
||||
"sts %d, %s\n", sts, strerror(errno));
|
||||
} else {
|
||||
fprintf(stderr, "Issued domain %d poweroff\n", xen_domid);
|
||||
}
|
||||
xc_interface_close(xc_handle);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue