mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
Ian Jackson
87b978d599
* Combine the various calls to libxl__device_model_savefile into one at the start of libxl__domain_suspend, storing the result in the dss. Consequently a few functions take a dss instead of some or all of their other arguments. * Make libxl__domain_save_device_model's API into an asynchronous style which takes a callback. The function is, however, still synchronous; it will be made actually async in the next patch. * Consequently make libxl__remus_domain_checkpoint_callback into an asynchronous callback. Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com> Acked-by: Ian Campbell <ian.campbell@citrix.com> Committed-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
399 lines
12 KiB
Perl
Executable File
399 lines
12 KiB
Perl
Executable File
#!/usr/bin/perl -w
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use warnings;
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use strict;
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use POSIX;
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our $debug = 0; # produce copious debugging output at run-time?
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our @msgs = (
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# flags:
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# s - applicable to save
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# r - applicable to restore
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# c - function pointer in callbacks struct rather than fixed function
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# x - function pointer is in struct {save,restore}_callbacks
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# and its null-ness needs to be passed through to the helper's xc
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# W - needs a return value; callback is synchronous
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# A - needs a return value; callback is asynchronous
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[ 1, 'sr', "log", [qw(uint32_t level
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uint32_t errnoval
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STRING context
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STRING formatted)] ],
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[ 2, 'sr', "progress", [qw(STRING context
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STRING doing_what),
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'unsigned long', 'done',
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'unsigned long', 'total'] ],
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[ 3, 'scxW', "suspend", [] ],
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[ 4, 'scxW', "postcopy", [] ],
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[ 5, 'scxA', "checkpoint", [] ],
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[ 6, 'scxA', "switch_qemu_logdirty", [qw(int domid
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unsigned enable)] ],
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# toolstack_save done entirely `by hand'
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[ 7, 'rcxW', "toolstack_restore", [qw(uint32_t domid
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BLOCK tsdata)] ],
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[ 8, 'r', "restore_results", ['unsigned long', 'store_mfn',
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'unsigned long', 'console_mfn',
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'unsigned long', 'genidad'] ],
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[ 9, 'srW', "complete", [qw(int retval
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int errnoval)] ],
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);
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#----------------------------------------
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our %cbs;
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our %func;
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our %func_ah;
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our @outfuncs;
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our %out_decls;
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our %out_body;
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our %msgnum_used;
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die unless @ARGV==1;
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die if $ARGV[0] =~ m/^-/;
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our ($intendedout) = @ARGV;
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$intendedout =~ m/([a-z]+)\.([ch])$/ or die;
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my ($want_ah, $ch) = ($1, $2);
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my $declprefix = '';
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foreach my $ah (qw(callout helper)) {
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$out_body{$ah} .=
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<<END_BOTH.($ah eq 'callout' ? <<END_CALLOUT : <<END_HELPER);
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#include "libxl_osdeps.h"
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#include <assert.h>
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#include <string.h>
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#include <stdint.h>
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#include <limits.h>
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END_BOTH
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#include "libxl_internal.h"
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END_CALLOUT
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#include "_libxl_save_msgs_${ah}.h"
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#include <xenctrl.h>
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#include <xenguest.h>
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END_HELPER
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}
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die $want_ah unless defined $out_body{$want_ah};
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sub f_decl ($$$$) {
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my ($name, $ah, $c_rtype, $c_decl) = @_;
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$out_decls{$name} = "${declprefix}$c_rtype $name$c_decl;\n";
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$func{$name} = "$c_rtype $name$c_decl\n{\n" . ($func{$name} || '');
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$func_ah{$name} = $ah;
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}
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sub f_more ($$) {
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my ($name, $addbody) = @_;
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$func{$name} ||= '';
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$func{$name} .= $addbody;
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push @outfuncs, $name;
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}
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our $libxl = "libxl__srm";
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our $callback = "${libxl}_callout_callback";
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our $receiveds = "${libxl}_callout_received";
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our $sendreply = "${libxl}_callout_sendreply";
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our $getcallbacks = "${libxl}_callout_get_callbacks";
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our $enumcallbacks = "${libxl}_callout_enumcallbacks";
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sub cbtype ($) { "${libxl}_".$_[0]."_autogen_callbacks"; };
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f_decl($sendreply, 'callout', 'void', "(int r, void *user)");
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our $helper = "helper";
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our $encode = "${helper}_stub";
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our $allocbuf = "${helper}_allocbuf";
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our $transmit = "${helper}_transmitmsg";
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our $getreply = "${helper}_getreply";
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our $setcallbacks = "${helper}_setcallbacks";
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f_decl($allocbuf, 'helper', 'unsigned char *', '(int len, void *user)');
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f_decl($transmit, 'helper', 'void',
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'(unsigned char *msg_freed, int len, void *user)');
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f_decl($getreply, 'helper', 'int', '(void *user)');
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sub typeid ($) { my ($t) = @_; $t =~ s/\W/_/; return $t; };
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$out_body{'callout'} .= <<END;
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static int bytes_get(const unsigned char **msg,
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const unsigned char *const endmsg,
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void *result, int rlen)
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{
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if (endmsg - *msg < rlen) return 0;
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memcpy(result,*msg,rlen);
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*msg += rlen;
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return 1;
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}
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END
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$out_body{'helper'} .= <<END;
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static void bytes_put(unsigned char *const buf, int *len,
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const void *value, int vlen)
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{
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assert(vlen < INT_MAX/2 - *len);
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if (buf)
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memcpy(buf + *len, value, vlen);
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*len += vlen;
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}
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END
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foreach my $simpletype (qw(int uint16_t uint32_t unsigned), 'unsigned long') {
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my $typeid = typeid($simpletype);
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$out_body{'callout'} .= <<END;
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static int ${typeid}_get(const unsigned char **msg,
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const unsigned char *const endmsg,
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$simpletype *result)
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{
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return bytes_get(msg, endmsg, result, sizeof(*result));
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}
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END
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$out_body{'helper'} .= <<END;
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static void ${typeid}_put(unsigned char *const buf, int *len,
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const $simpletype value)
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{
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bytes_put(buf, len, &value, sizeof(value));
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}
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END
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}
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$out_body{'callout'} .= <<END;
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static int BLOCK_get(const unsigned char **msg,
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const unsigned char *const endmsg,
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const uint8_t **result, uint32_t *result_size)
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{
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if (!uint32_t_get(msg,endmsg,result_size)) return 0;
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if (endmsg - *msg < *result_size) return 0;
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*result = (const void*)*msg;
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*msg += *result_size;
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return 1;
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}
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static int STRING_get(const unsigned char **msg,
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const unsigned char *const endmsg,
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const char **result)
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{
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const uint8_t *data;
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uint32_t datalen;
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if (!BLOCK_get(msg,endmsg,&data,&datalen)) return 0;
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if (datalen == 0) return 0;
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if (data[datalen-1] != '\\0') return 0;
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*result = (const void*)data;
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return 1;
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}
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END
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$out_body{'helper'} .= <<END;
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static void BLOCK_put(unsigned char *const buf,
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int *len,
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const uint8_t *bytes, uint32_t size)
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{
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uint32_t_put(buf, len, size);
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bytes_put(buf, len, bytes, size);
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}
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static void STRING_put(unsigned char *const buf,
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int *len,
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const char *string)
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{
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size_t slen = strlen(string);
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assert(slen < INT_MAX / 4);
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assert(slen < (uint32_t)0x40000000);
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BLOCK_put(buf, len, (const void*)string, slen+1);
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}
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END
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foreach my $sr (qw(save restore)) {
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f_decl("${getcallbacks}_${sr}", 'callout',
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"const ".cbtype($sr)." *",
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"(void *data)");
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f_decl("${receiveds}_${sr}", 'callout', 'int',
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"(const unsigned char *msg, uint32_t len, void *user)");
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f_decl("${enumcallbacks}_${sr}", 'callout', 'unsigned',
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"(const ".cbtype($sr)." *cbs)");
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f_more("${enumcallbacks}_${sr}", " unsigned cbflags = 0;\n");
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f_decl("${setcallbacks}_${sr}", 'helper', 'void',
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"(struct ${sr}_callbacks *cbs, unsigned cbflags)");
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f_more("${receiveds}_${sr}",
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<<END_ALWAYS.($debug ? <<END_DEBUG : '').<<END_ALWAYS);
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const unsigned char *const endmsg = msg + len;
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uint16_t mtype;
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if (!uint16_t_get(&msg,endmsg,&mtype)) return 0;
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END_ALWAYS
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fprintf(stderr,"libxl callout receiver: got len=%u mtype=%u\\n",len,mtype);
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END_DEBUG
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switch (mtype) {
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END_ALWAYS
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$cbs{$sr} = "typedef struct ".cbtype($sr)." {\n";
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}
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foreach my $msginfo (@msgs) {
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my ($msgnum, $flags, $name, $args) = @$msginfo;
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die if $msgnum_used{$msgnum}++;
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my $f_more_sr = sub {
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my ($contents_spec, $fnamebase) = @_;
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$fnamebase ||= "${receiveds}";
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foreach my $sr (qw(save restore)) {
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$sr =~ m/^./;
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next unless $flags =~ m/$&/;
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my $contents = (!ref $contents_spec) ? $contents_spec :
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$contents_spec->($sr);
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f_more("${fnamebase}_${sr}", $contents);
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}
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};
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$f_more_sr->(" case $msgnum: { /* $name */\n");
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if ($flags =~ m/W/) {
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$f_more_sr->(" int r;\n");
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}
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my $c_rtype_helper = $flags =~ m/[WA]/ ? 'int' : 'void';
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my $c_rtype_callout = $flags =~ m/W/ ? 'int' : 'void';
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my $c_decl = '(';
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my $c_callback_args = '';
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f_more("${encode}_$name",
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<<END_ALWAYS.($debug ? <<END_DEBUG : '').<<END_ALWAYS);
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unsigned char *buf = 0;
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int len = 0, allocd = 0;
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END_ALWAYS
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fprintf(stderr,"libxl-save-helper: encoding $name\\n");
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END_DEBUG
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for (;;) {
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uint16_t_put(buf, &len, $msgnum /* $name */);
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END_ALWAYS
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my @args = @$args;
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my $c_recv = '';
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my ($argtype, $arg);
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while (($argtype, $arg, @args) = @args) {
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my $typeid = typeid($argtype);
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my $c_args = "$arg";
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my $c_get_args = "&$arg";
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if ($argtype eq 'STRING') {
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$c_decl .= "const char *$arg, ";
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$f_more_sr->(" const char *$arg;\n");
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} elsif ($argtype eq 'BLOCK') {
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$c_decl .= "const uint8_t *$arg, uint32_t ${arg}_size, ";
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$c_args .= ", ${arg}_size";
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$c_get_args .= ",&${arg}_size";
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$f_more_sr->(" const uint8_t *$arg;\n".
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" uint32_t ${arg}_size;\n");
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} else {
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$c_decl .= "$argtype $arg, ";
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$f_more_sr->(" $argtype $arg;\n");
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}
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$c_callback_args .= "$c_args, ";
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$c_recv.=
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" if (!${typeid}_get(&msg,endmsg,$c_get_args)) return 0;\n";
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f_more("${encode}_$name", " ${typeid}_put(buf, &len, $c_args);\n");
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}
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$f_more_sr->($c_recv);
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$c_decl .= "void *user)";
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$c_callback_args .= "user";
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$f_more_sr->(" if (msg != endmsg) return 0;\n");
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my $c_callback;
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if ($flags !~ m/c/) {
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$c_callback = "${callback}_$name";
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} else {
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$f_more_sr->(sub {
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my ($sr) = @_;
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$cbs{$sr} .= " $c_rtype_callout (*${name})$c_decl;\n";
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return
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" const ".cbtype($sr)." *const cbs =\n".
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" ${getcallbacks}_${sr}(user);\n";
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});
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$c_callback = "cbs->${name}";
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}
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my $c_make_callback = "$c_callback($c_callback_args)";
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if ($flags !~ m/W/) {
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$f_more_sr->(" $c_make_callback;\n");
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} else {
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$f_more_sr->(" r = $c_make_callback;\n".
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" $sendreply(r, user);\n");
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f_decl($sendreply, 'callout', 'void', '(int r, void *user)');
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}
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if ($flags =~ m/x/) {
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my $c_v = "(1u<<$msgnum)";
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my $c_cb = "cbs->$name";
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$f_more_sr->(" if ($c_cb) cbflags |= $c_v;\n", $enumcallbacks);
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$f_more_sr->(" $c_cb = (cbflags & $c_v) ? ${encode}_${name} : 0;\n",
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$setcallbacks);
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}
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$f_more_sr->(" return 1;\n }\n\n");
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f_decl("${callback}_$name", 'callout', $c_rtype_callout, $c_decl);
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f_decl("${encode}_$name", 'helper', $c_rtype_helper, $c_decl);
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f_more("${encode}_$name",
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" if (buf) break;
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buf = ${helper}_allocbuf(len, user);
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assert(buf);
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allocd = len;
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len = 0;
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}
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assert(len == allocd);
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${transmit}(buf, len, user);
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");
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if ($flags =~ m/[WA]/) {
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f_more("${encode}_$name",
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(<<END_ALWAYS.($debug ? <<END_DEBUG : '').<<END_ALWAYS));
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int r = ${helper}_getreply(user);
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END_ALWAYS
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fprintf(stderr,"libxl-save-helper: $name got reply %d\\n",r);
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END_DEBUG
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return r;
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END_ALWAYS
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}
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}
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print "/* AUTOGENERATED by $0 DO NOT EDIT */\n\n" or die $!;
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foreach my $sr (qw(save restore)) {
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f_more("${enumcallbacks}_${sr}",
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" return cbflags;\n");
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f_more("${receiveds}_${sr}",
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" default:\n".
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" return 0;\n".
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" }");
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$cbs{$sr} .= "} ".cbtype($sr).";\n\n";
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if ($ch eq 'h') {
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print $cbs{$sr} or die $!;
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print "struct ${sr}_callbacks;\n";
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}
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}
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if ($ch eq 'c') {
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foreach my $name (@outfuncs) {
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next unless defined $func{$name};
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$func{$name} .= "}\n\n";
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$out_body{$func_ah{$name}} .= $func{$name};
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delete $func{$name};
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}
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print $out_body{$want_ah} or die $!;
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} else {
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foreach my $name (sort keys %out_decls) {
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next unless $func_ah{$name} eq $want_ah;
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print $out_decls{$name} or die $!;
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}
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}
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close STDOUT or die $!;
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