From 6750485bf42a9917a29487aec899687669104e07 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 21 Jun 2023 00:47:31 +0200 Subject: 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 Signed-off-by: Paolo Bonzini --- meson.build | 2 ++ 1 file changed, 2 insertions(+) (limited to 'meson.build') 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 ')) # 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 ')) -- cgit v1.1