diff options
| 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 /target/i386/helper.h | |
| parent | 53b9b4cc9fb956279c6494bfa7d7ea61f07bb214 (diff) | |
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 'target/i386/helper.h')
| -rw-r--r-- | target/i386/helper.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/target/i386/helper.h b/target/i386/helper.h index 48609c210b..c93c1d6c8f 100644 --- a/target/i386/helper.h +++ b/target/i386/helper.h @@ -69,8 +69,8 @@ DEF_HELPER_2(into, void, env, int) DEF_HELPER_FLAGS_1(single_step, TCG_CALL_NO_WG, noreturn, env) DEF_HELPER_1(rechecking_single_step, void, env) DEF_HELPER_1(cpuid, void, env) +DEF_HELPER_FLAGS_1(rdpid, TCG_CALL_NO_WG, tl, env) DEF_HELPER_1(rdtsc, void, env) -DEF_HELPER_1(rdtscp, void, env) DEF_HELPER_FLAGS_1(rdpmc, TCG_CALL_NO_WG, noreturn, env) #ifndef CONFIG_USER_ONLY |