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).
For BSD, just return 0.
RDTSCP is reimplemented as RDTSC + RDPID ECX; the differences in terms
of serializability are not relevant to QEMU.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
meson.build | 1 +
target/i386/cpu.c | 10 +++++++++-
target/i386/helper.h | 2 +-
target/i386/tcg/misc_helper.c | 23 +++++++++++++++++------
target/i386/tcg/translate.c | 15 +++++++++++++--
5 files changed, 41 insertions(+), 10 deletions(-)
diff --git a/meson.build b/meson.build
index 34306a6205b..0f6c5a70333 100644
--- a/meson.build
+++ b/meson.build
@@ -2230,6 +2230,7 @@ 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))
# 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>'))
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 2c71c3ea32b..974e2eb46d7 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -674,9 +674,17 @@ void x86_cpu_vendor_words2str(char *dst, uint32_t vendor1,
/* missing:
CPUID_7_0_EBX_HLE
CPUID_7_0_EBX_INVPCID, CPUID_7_0_EBX_RTM */
+
+#if defined CONFIG_SOFTMMU || defined CONFIG_LINUX
+#define TCG_7_0_ECX_RDPID CPUID_7_0_ECX_RDPID
+#else
+#define TCG_7_0_ECX_RDPID 0
+#endif
#define TCG_7_0_ECX_FEATURES (CPUID_7_0_ECX_UMIP | CPUID_7_0_ECX_PKU | \
/* CPUID_7_0_ECX_OSPKE is dynamic */ \
- CPUID_7_0_ECX_LA57 | CPUID_7_0_ECX_PKS | CPUID_7_0_ECX_VAES)
+ CPUID_7_0_ECX_LA57 | CPUID_7_0_ECX_PKS | CPUID_7_0_ECX_VAES | \
+ TCG_7_0_ECX_RDPID)
+
#define TCG_7_0_EDX_FEATURES CPUID_7_0_EDX_FSRM
#define TCG_7_1_EAX_FEATURES (CPUID_7_1_EAX_FZRM | CPUID_7_1_EAX_FSRS | \
CPUID_7_1_EAX_FSRC)
diff --git a/target/i386/helper.h b/target/i386/helper.h
index 49d2f537557..d796f0d2f70 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
diff --git a/target/i386/tcg/misc_helper.c b/target/i386/tcg/misc_helper.c
index 5f7a3061ca5..66d6bbfcb40 100644
--- a/target/i386/tcg/misc_helper.c
+++ b/target/i386/tcg/misc_helper.c
@@ -75,12 +79,6 @@ void helper_rdtsc(CPUX86State *env)
env->regs[R_EDX] = (uint32_t)(val >> 32);
}
-void helper_rdtscp(CPUX86State *env)
-{
- helper_rdtsc(env);
- env->regs[R_ECX] = (uint32_t)(env->tsc_aux);
-}
-
G_NORETURN void helper_rdpmc(CPUX86State *env)
{
if (((env->cr[4] & CR4_PCE_MASK) == 0 ) &&
@@ -137,3 +135,16 @@ void helper_wrpkru(CPUX86State *env, uint32_t ecx,
uint64_t val)
env->pkru = val;
tlb_flush(cs);
}
+
+target_ulong HELPER(rdpid)(CPUX86State *env)
+{
+#if defined CONFIG_SOFTMMU
+ return env->tsc_aux;
+#elif defined CONFIG_LINUX && defined CONFIG_GETCPU
+ unsigned cpu, node;
+ getcpu(&cpu, &node);
+ return (node << 12) | (cpu & 0xfff);
+#else
+ return 0;
+#endif
+}
diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index af74c842f96..a803bcb96b3 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -3924,7 +3924,16 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
gen_cmpxchg8b(s, env, modrm);
break;
- case 7: /* RDSEED */
+ case 7: /* RDSEED, RDPID with f3 prefix */
+ if (mod == 3 && !(s->prefix & PREFIX_LOCK) &&
+ (s->prefix & PREFIX_REPZ) &&
+ (s->cpuid_ext_features & CPUID_7_0_ECX_RDPID)) {
+ gen_helper_rdpid(s->T0, cpu_env);
+ rm = (modrm & 7) | REX_B(s);
+ gen_op_mov_reg_v(s, dflag, rm, s->T0);
+ break;
+ }
+ /* fallthrough */
case 6: /* RDRAND */
if (mod != 3 ||
(s->prefix & (PREFIX_LOCK | PREFIX_REPZ | PREFIX_REPNZ)) ||
@@ -6111,7 +6120,9 @@ static bool disas_insn(DisasContext *s, CPUState *cpu)
gen_update_cc_op(s);
gen_update_eip_cur(s);
translator_io_start(&s->base);
- gen_helper_rdtscp(cpu_env);
+ gen_helper_rdtsc(cpu_env);
+ gen_helper_rdpid(s->T0, cpu_env);
+ gen_op_mov_reg_v(s, dflag, R_ECX, s->T0);
break;
default:
--
2.40.1
