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| author | Paolo Bonzini <pbonzini@redhat.com> | 2023-06-21 00:47:31 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2023-06-26 10:23:56 +0200 |
| commit | 6750485bf42a9917a29487aec899687669104e07 (patch) | |
| tree | f3041f5dcd012248e81091fb384e28767fe12195 /meson.build | |
| parent | 53b9b4cc9fb956279c6494bfa7d7ea61f07bb214 (diff) | |
| download | qemu-6750485bf42a9917a29487aec899687669104e07.zip qemu-6750485bf42a9917a29487aec899687669104e07.tar.gz qemu-6750485bf42a9917a29487aec899687669104e07.tar.bz2 | |
target/i386: implement RDPID in TCG
RDPID corresponds to a RDMSR(TSC_AUX); however, it is unprivileged
so for user-mode emulation we must provide the value that the kernel
places in the MSR. For Linux, it is a combination of the current CPU
and the current NUMA node, both of which can be retrieved with getcpu(2).
Also try sched_getcpu(), which might be there on the BSDs. If there is
no portable way to retrieve the current CPU id from userspace, return 0.
RDTSCP is reimplemented as RDTSC + RDPID ECX; the differences in terms
of serializability are not relevant to QEMU.
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'meson.build')
| -rw-r--r-- | meson.build | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/meson.build b/meson.build index 6ef78ea..3e3d38b 100644 --- a/meson.build +++ b/meson.build @@ -2232,6 +2232,8 @@ config_host_data.set('CONFIG_CLOCK_ADJTIME', cc.has_function('clock_adjtime')) config_host_data.set('CONFIG_DUP3', cc.has_function('dup3')) config_host_data.set('CONFIG_FALLOCATE', cc.has_function('fallocate')) config_host_data.set('CONFIG_POSIX_FALLOCATE', cc.has_function('posix_fallocate')) +config_host_data.set('CONFIG_GETCPU', cc.has_function('getcpu', prefix: gnu_source_prefix)) +config_host_data.set('CONFIG_SCHED_GETCPU', cc.has_function('sched_getcpu', prefix: '#include <sched.h>')) # Note that we need to specify prefix: here to avoid incorrectly # thinking that Windows has posix_memalign() config_host_data.set('CONFIG_POSIX_MEMALIGN', cc.has_function('posix_memalign', prefix: '#include <stdlib.h>')) |