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linux-user: Pass CPUState to MAX_RESERVED_VA 

Turn the scalar macro into a functional macro.  Move the creation
of the cpu up a bit within main() so that we can pass it to the
invocation of MAX_RESERVED_VA.  Delay the validation of the -R
parameter until MAX_RESERVED_VA is computed.

So far no changes to any of the MAX_RESERVED_VA macros to actually
use the cpu in any way, but ARM will need it.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-Id: <20190822185929.16891-2-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2019-08-22 11:59:28 -07:00 committed by Laurent Vivier
parent 9bdfa4d23f
commit 8f67b9c694
2 changed files with 26 additions and 19 deletions
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2
linux-user/arm/target_cpu.h
View File

@ -21,7 +21,7 @@
/* We need to be able to map the commpage.
See validate_guest_space in linux-user/elfload.c. */
#define MAX_RESERVED_VA 0xffff0000ul
#define MAX_RESERVED_VA(CPU) 0xffff0000ul
static inline void cpu_clone_regs(CPUARMState *env, target_ulong newsp)
{

43
linux-user/main.c
View File

@ -77,12 +77,12 @@ int have_guest_base;
(TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
/* There are a number of places where we assign reserved_va to a variable
of type abi_ulong and expect it to fit. Avoid the last page. */
# define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK)
# define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK)
# else
# define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
# define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
# endif
# else
# define MAX_RESERVED_VA 0
# define MAX_RESERVED_VA(CPU) 0
# endif
#endif
@ -356,8 +356,7 @@ static void handle_arg_reserved_va(const char *arg)
unsigned long unshifted = reserved_va;
p++;
reserved_va <<= shift;
if (reserved_va >> shift != unshifted
|| (MAX_RESERVED_VA && reserved_va > MAX_RESERVED_VA)) {
if (reserved_va >> shift != unshifted) {
fprintf(stderr, "Reserved virtual address too big\n");
exit(EXIT_FAILURE);
}
@ -605,6 +604,7 @@ int main(int argc, char **argv, char **envp)
int i;
int ret;
int execfd;
unsigned long max_reserved_va;
error_init(argv[0]);
module_call_init(MODULE_INIT_TRACE);
@ -670,24 +670,31 @@ int main(int argc, char **argv, char **envp)
/* init tcg before creating CPUs and to get qemu_host_page_size */
tcg_exec_init(0);
/* Reserving *too* much vm space via mmap can run into problems
with rlimits, oom due to page table creation, etc. We will still try it,
if directed by the command-line option, but not by default. */
if (HOST_LONG_BITS == 64 &&
TARGET_VIRT_ADDR_SPACE_BITS <= 32 &&
reserved_va == 0) {
/* reserved_va must be aligned with the host page size
* as it is used with mmap()
*/
reserved_va = MAX_RESERVED_VA & qemu_host_page_mask;
}
cpu = cpu_create(cpu_type);
env = cpu->env_ptr;
cpu_reset(cpu);
thread_cpu = cpu;
/*
* Reserving too much vm space via mmap can run into problems
* with rlimits, oom due to page table creation, etc. We will
* still try it, if directed by the command-line option, but
* not by default.
*/
max_reserved_va = MAX_RESERVED_VA(cpu);
if (reserved_va != 0) {
if (max_reserved_va && reserved_va > max_reserved_va) {
fprintf(stderr, "Reserved virtual address too big\n");
exit(EXIT_FAILURE);
}
} else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
/*
* reserved_va must be aligned with the host page size
* as it is used with mmap()
*/
reserved_va = max_reserved_va & qemu_host_page_mask;
}
if (getenv("QEMU_STRACE")) {
do_strace = 1;
}