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[PULL 01/37] linux-user: use 'max' instead of 'qemu32' / 'qemu64' by def
From: |
Laurent Vivier |
Subject: |
[PULL 01/37] linux-user: use 'max' instead of 'qemu32' / 'qemu64' by default |
Date: |
Wed, 28 Sep 2022 22:27:01 +0200 |
From: Daniel P. Berrangé <berrange@redhat.com>
The 'qemu64' CPU model implements the least featureful x86_64 CPU that's
possible. Historically this hasn't been an issue since it was rare for
OS distros to build with a higher mandatory CPU baseline.
With RHEL-9, however, the entire distro is built for the x86_64-v2 ABI
baseline:
https://developers.redhat.com/blog/2021/01/05/building-red-hat-enterprise-linux-9-for-the-x86-64-v2-microarchitecture-level
It is likely that other distros may take similar steps in the not too
distant future. For example, it has been suggested for Fedora on a
number of occasions.
This new baseline is not compatible with the qemu64 CPU model though.
While it is possible to pass a '-cpu xxx' flag to qemu-x86_64, the
usage of QEMU doesn't always allow for this. For example, the args
are typically controlled via binfmt rules that the user has no ability
to change. This impacts users who are trying to use podman on aarch64
platforms, to run containers with x86_64 content. There's no arg to
podman that can be used to change the qemu-x86_64 args, and a non-root
user of podman can not change binfmt rules without elevating privileges:
https://github.com/containers/podman/issues/15456#issuecomment-1228210973
Changing to the 'max' CPU model gives 'qemu-x86_64' maximum
compatibility with binaries it is likely to encounter in the wild,
and not likely to have a significant downside for existing usage.
Most other architectures already use an 'any' CPU model, which is
often mapped to 'max' (or similar) already, rather than the oldest
possible CPU model.
For the sake of consistency the 'i386' architecture is also changed
from using 'qemu32' to 'max'.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220923110413.70593-1-berrange@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
linux-user/i386/target_elf.h | 2 +-
linux-user/x86_64/target_elf.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/linux-user/i386/target_elf.h b/linux-user/i386/target_elf.h
index 1c6142e7da0d..238a9aba738a 100644
--- a/linux-user/i386/target_elf.h
+++ b/linux-user/i386/target_elf.h
@@ -9,6 +9,6 @@
#define I386_TARGET_ELF_H
static inline const char *cpu_get_model(uint32_t eflags)
{
- return "qemu32";
+ return "max";
}
#endif
diff --git a/linux-user/x86_64/target_elf.h b/linux-user/x86_64/target_elf.h
index 7b76a90de880..3f628f8d6619 100644
--- a/linux-user/x86_64/target_elf.h
+++ b/linux-user/x86_64/target_elf.h
@@ -9,6 +9,6 @@
#define X86_64_TARGET_ELF_H
static inline const char *cpu_get_model(uint32_t eflags)
{
- return "qemu64";
+ return "max";
}
#endif
--
2.37.3
- [PULL 00/37] Linux user for 7.2 patches, Laurent Vivier, 2022/09/28
- [PULL 05/37] linux-user: Add pidfd_open(), pidfd_send_signal() and pidfd_getfd() syscalls, Laurent Vivier, 2022/09/28
- [PULL 02/37] linux-user: fix readlinkat handling with magic exe symlink, Laurent Vivier, 2022/09/28
- [PULL 03/37] linux-user: Add missing signals in strace output, Laurent Vivier, 2022/09/28
- [PULL 11/37] linux-user: Add strace for clock_nanosleep(), Laurent Vivier, 2022/09/28
- [PULL 01/37] linux-user: use 'max' instead of 'qemu32' / 'qemu64' by default,
Laurent Vivier <=
- [PULL 04/37] linux-user: Add missing clock_gettime64() syscall strace, Laurent Vivier, 2022/09/28
- [PULL 07/37] linux-user/hppa: Use EXCP_DUMP() to show enhanced debug info, Laurent Vivier, 2022/09/28
- [PULL 09/37] linux-user: Fix strace of chmod() if mode == 0, Laurent Vivier, 2022/09/28
- [PULL 06/37] linux-user: Log failing executable in EXCP_DUMP(), Laurent Vivier, 2022/09/28
- [PULL 10/37] linux-user/hppa: Set TASK_UNMAPPED_BASE to 0xfa000000 for hppa arch, Laurent Vivier, 2022/09/28
- [PULL 12/37] linux-user: Show timespec on strace for futex(), Laurent Vivier, 2022/09/28
- [PULL 08/37] linux-user/hppa: Dump IIR on register dump, Laurent Vivier, 2022/09/28
- [PULL 14/37] linux-user: Fix madvise(MADV_DONTNEED) on alpha, Laurent Vivier, 2022/09/28
- [PULL 18/37] linux-user: Fix TARGET_PROT_SEM for XTENSA, Laurent Vivier, 2022/09/28
- [PULL 13/37] linux-user: Provide MADV_* definitions, Laurent Vivier, 2022/09/28