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client.c
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client.c
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/*
*
* Copyright 2023 Kenichi Yasukata
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
void ____asm_impl_client(void)
{
asm volatile (
/* -- 4K align -- */
".align 0x1000 \n\t"
".globl gate_entry_page \n\t"
"gate_entry_page: \n\t"
".space 0x1000 - (gate_entry_end - elisa_gate_entry) \n\t"
".globl elisa_gate_entry \n\t"
"elisa_gate_entry: \n\t"
"endbr64 \n\t"
"push %rbp \n\t"
"movq %rsp, %rbp \n\t"
"push %rbx \n\t"
"movq $0x0, %rax \n\t"
"vmfunc \n\t"
"gate_entry_end: \n\t"
/* -- 4K align -- */
/* this 4K page, will map gate_ctx_page in gate context */
".space 0x1000 \n\t"
/* -- 4K align -- */
"gate_exit: \n\t"
"movq %rbx, %rax \n\t"
"pop %rbx \n\t"
"leaveq \n\t"
"retq \n\t"
"gate_exit_end: \n\t"
".space 0x1000 - (gate_exit_end - gate_exit) \n\t"
);
}
extern void gate_entry_page(void);
int elisa_client(const char *server_addr_str, const int server_port, int client_cb(int))
{
int fd;
assert((fd = netfd_init(server_addr_str, server_port)) >= 0);
{
uint64_t vcpu_id = get_guest_vcpu_id();
assert(write(fd, &vcpu_id, sizeof(vcpu_id)) == sizeof(vcpu_id));
}
{
uint64_t request_gva = (uint64_t) gate_entry_page + 0x1000;
assert(!((uint64_t) request_gva % 0x1000));
assert(write(fd, &request_gva, sizeof(request_gva)) == sizeof(request_gva));
}
assert(!client_cb(fd));
{
uint64_t ack;
assert(read(fd, &ack, sizeof(ack)) == sizeof(ack));
}
elisa_guest_activate();
return fd;
}