compel/criu: Add ARCH_HAS_LONG_PAGES to PIE binaries

For architectures like aarch64/ppc64 it's needed to propagate the size
of page inside PIEs. For the parasite page size will be defined during
seizing, and for restorer during early initialization.
Afterward we can use PAGE_SIZE in PIEs like we did before.
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/include/rpc-pie-priv.h

@@ -38,6 +38,9 @@ struct parasite_init_args {
 	uint64_t			sigreturn_addr;
 	uint64_t			sigframe; /* pointer to sigframe */
 	futex_t				daemon_connected;
+#ifdef ARCH_HAS_LONG_PAGES
+	uint32_t			page_size;
+#endif
 };
 
 struct parasite_unmap_args {

compel/plugins/std/infect.c

@@ -3,6 +3,7 @@
 #include "common/scm.h"
 #include "common/compiler.h"
 #include "common/lock.h"
+#include "common/page.h"
 
 #define pr_err(fmt, ...)	print_on_level(1, fmt, ##__VA_ARGS__)
 #define pr_info(fmt, ...)	print_on_level(3, fmt, ##__VA_ARGS__)
@@ -19,6 +20,19 @@ static int tsock = -1;
 
 static struct rt_sigframe *sigframe;
 
+#ifdef ARCH_HAS_LONG_PAGES
+/*
+ * XXX: Make it compel's std plugin global variable. Drop parasite_size().
+ * Hint: compel on aarch64 shall learn relocs for that.
+ */
+static unsigned __page_size;
+
+unsigned __attribute((weak)) page_size(void)
+{
+	return __page_size;
+}
+#endif
+
 int parasite_get_rpc_sock(void)
 {
 	return tsock;
@@ -142,6 +156,9 @@ static noinline __used int parasite_init_daemon(void *data)
 
 	args->sigreturn_addr = (uint64_t)(uintptr_t)fini_sigreturn;
 	sigframe = (void*)(uintptr_t)args->sigframe;
+#ifdef ARCH_HAS_LONG_PAGES
+	__page_size = args->page_size;
+#endif
 
 	ret = tsock = sys_socket(PF_UNIX, SOCK_SEQPACKET, 0);
 	if (tsock < 0) {

compel/src/lib/infect.c

@@ -613,6 +613,9 @@ static int parasite_init_daemon(struct parasite_ctl *ctl)
 
 	args->sigframe = (uintptr_t)ctl->rsigframe;
 	args->log_level = compel_log_get_loglevel();
+#ifdef ARCH_HAS_LONG_PAGES
+	args->page_size = PAGE_SIZE;
+#endif
 
 	futex_set(&args->daemon_connected, 0);
 

criu/cr-restore.c

@@ -3321,6 +3321,9 @@ static int sigreturn_restore(pid_t pid, struct task_restore_args *task_args, uns
 	task_args->premmapped_len = rsti(current)->premmapped_len;
 
 	task_args->task_size = kdat.task_size;
+#ifdef ARCH_HAS_LONG_PAGES
+	task_args->page_size = PAGE_SIZE;
+#endif
 
 	RST_MEM_FIXUP_PPTR(task_args->vmas);
 	RST_MEM_FIXUP_PPTR(task_args->rings);

criu/include/restorer.h

@@ -200,6 +200,9 @@ struct task_restore_args {
 	void				**breakpoint;
 
 	enum faults			fault_strategy;
+#ifdef ARCH_HAS_LONG_PAGES
+	unsigned			page_size;
+#endif
 } __aligned(64);
 
 /*

criu/pie/restorer.c

@@ -36,6 +36,7 @@
 #include "uffd.h"
 
 #include "common/lock.h"
+#include "common/page.h"
 #include "restorer.h"
 #include "aio.h"
 #include "seccomp.h"
@@ -70,6 +71,18 @@ bool fault_injected(enum faults f)
 	return __fault_injected(f, fi_strategy);
 }
 
+#ifdef ARCH_HAS_LONG_PAGES
+/*
+ * XXX: Make it compel's std plugin global variable. Drop parasite_size().
+ * Hint: compel on aarch64 shall learn relocs for that.
+ */
+static unsigned __page_size;
+unsigned page_size(void)
+{
+	return __page_size;
+}
+#endif
+
 /*
  * These are stubs for std compel plugin.
  */
@@ -1198,6 +1211,9 @@ long __export_restore_task(struct task_restore_args *args)
 	zombies = args->zombies;
 	n_zombies = args->zombies_n;
 	*args->breakpoint = rst_sigreturn;
+#ifdef ARCH_HAS_LONG_PAGES
+	__page_size = args->page_size;
+#endif
 
 	ksigfillset(&act.rt_sa_mask);
 	act.rt_sa_handler = sigchld_handler;

include/common/arch/aarch64/asm/page.h

 #ifndef __CR_ASM_PAGE_H__
 #define __CR_ASM_PAGE_H__
 
+#define ARCH_HAS_LONG_PAGES
+
+#ifndef CR_NOGLIBC
 #include <unistd.h>
 
 #ifndef PAGE_SHIFT
@@ -18,4 +21,10 @@
 #define PAGE_PFN(addr)	((addr) / PAGE_SIZE)
 #define page_size()	sysconf(_SC_PAGESIZE)
 
+#else /* CR_NOGLIBC */
+
+extern unsigned page_size(void);
+#define PAGE_SIZE page_size()
+
+#endif /* CR_NOGLIBC */
 #endif /* __CR_ASM_PAGE_H__ */

include/common/arch/ppc64/asm/page.h

 #ifndef __CR_ASM_PAGE_H__
 #define __CR_ASM_PAGE_H__
 
+#define ARCH_HAS_LONG_PAGES
+
+#ifndef CR_NOGLIBC
 #include <unistd.h>
 
 /*
@@ -22,4 +25,10 @@
 #define PAGE_PFN(addr)	((addr) / PAGE_SIZE)
 #define page_size()	sysconf(_SC_PAGESIZE)
 
+#else /* CR_NOGLIBC */
+
+extern unsigned page_size(void);
+#define PAGE_SIZE page_size()
+
+#endif /* CR_NOGLIBC */
 #endif /* __CR_ASM_PAGE_H__ */