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From 7e7c5dab29ed99bda0fb5d810db6f12ae4aa2608 Mon Sep 17 00:00:00 2001
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From: "plai@redhat.com" <plai@redhat.com>
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Date: Tue, 26 Nov 2019 18:36:54 +0000
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Subject: [PATCH 10/11] x86/cpu: Add support for UMONITOR/UMWAIT/TPAUSE
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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x86/cpu: Add support for UMONITOR/UMWAIT/TPAUSE
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RH-Author: plai@redhat.com
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Message-id: <1574797015-32564-7-git-send-email-plai@redhat.com>
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Patchwork-id: 92695
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O-Subject: [RHEL8.2 qemu-kvm PATCH 6/7] x86/cpu: Add support for UMONITOR/UMWAIT/TPAUSE
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Bugzilla: 1634827
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Michael S. Tsirkin <mst@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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From: Tao Xu <tao3.xu@intel.com>
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UMONITOR, UMWAIT and TPAUSE are a set of user wait instructions.
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This patch adds support for user wait instructions in KVM. Availability
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of the user wait instructions is indicated by the presence of the CPUID
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feature flag WAITPKG CPUID.0x07.0x0:ECX[5]. User wait instructions may
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be executed at any privilege level, and use IA32_UMWAIT_CONTROL MSR to
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set the maximum time.
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The patch enable the umonitor, umwait and tpause features in KVM.
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Because umwait and tpause can put a (psysical) CPU into a power saving
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state, by default we dont't expose it to kvm and enable it only when
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guest CPUID has it. And use QEMU command-line "-overcommit cpu-pm=on"
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(enable_cpu_pm is enabled), a VM can use UMONITOR, UMWAIT and TPAUSE
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instructions. If the instruction causes a delay, the amount of time
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delayed is called here the physical delay. The physical delay is first
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computed by determining the virtual delay (the time to delay relative to
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the VM’s timestamp counter). Otherwise, UMONITOR, UMWAIT and TPAUSE cause
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an invalid-opcode exception(#UD).
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The release document ref below link:
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https://software.intel.com/sites/default/files/\
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managed/39/c5/325462-sdm-vol-1-2abcd-3abcd.pdf
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Co-developed-by: Jingqi Liu <jingqi.liu@intel.com>
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Signed-off-by: Jingqi Liu <jingqi.liu@intel.com>
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Signed-off-by: Tao Xu <tao3.xu@intel.com>
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Message-Id: <20191011074103.30393-2-tao3.xu@intel.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 67192a298f5bf98f96e5516c3b6474c49e4853cd)
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Signed-off-by: Paul Lai <plai@redhat.com>
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Resolved Conflicts:
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target/i386/cpu.c
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target/i386/cpu.h
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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target/i386/cpu.c | 2 +-
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target/i386/cpu.h | 2 ++
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target/i386/kvm.c | 6 ++++++
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3 files changed, 9 insertions(+), 1 deletion(-)
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diff --git a/target/i386/cpu.c b/target/i386/cpu.c
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index 87b0502..7d2afc7 100644
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--- a/target/i386/cpu.c
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+++ b/target/i386/cpu.c
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@@ -1016,7 +1016,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
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.type = CPUID_FEATURE_WORD,
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.feat_names = {
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NULL, "avx512vbmi", "umip", "pku",
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- "ospke", NULL, "avx512vbmi2", NULL,
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+ "ospke", "waitpkg", "avx512vbmi2", NULL,
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"gfni", "vaes", "vpclmulqdq", "avx512vnni",
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"avx512bitalg", NULL, "avx512-vpopcntdq", NULL,
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"la57", NULL, NULL, NULL,
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diff --git a/target/i386/cpu.h b/target/i386/cpu.h
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index 7ab8ee9..fac98aa 100644
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--- a/target/i386/cpu.h
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+++ b/target/i386/cpu.h
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@@ -708,6 +708,8 @@ typedef uint64_t FeatureWordArray[FEATURE_WORDS];
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#define CPUID_7_0_ECX_UMIP (1U << 2)
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#define CPUID_7_0_ECX_PKU (1U << 3)
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#define CPUID_7_0_ECX_OSPKE (1U << 4)
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+/* UMONITOR/UMWAIT/TPAUSE Instructions */
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+#define CPUID_7_0_ECX_WAITPKG (1U << 5)
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#define CPUID_7_0_ECX_VBMI2 (1U << 6) /* Additional VBMI Instrs */
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#define CPUID_7_0_ECX_GFNI (1U << 8)
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#define CPUID_7_0_ECX_VAES (1U << 9)
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diff --git a/target/i386/kvm.c b/target/i386/kvm.c
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index ffd01f0..0fd5650 100644
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--- a/target/i386/kvm.c
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+++ b/target/i386/kvm.c
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@@ -392,6 +392,12 @@ uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
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if (host_tsx_blacklisted()) {
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ret &= ~(CPUID_7_0_EBX_RTM | CPUID_7_0_EBX_HLE);
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}
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+ } else if (function == 7 && index == 0 && reg == R_ECX) {
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+ if (enable_cpu_pm) {
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+ ret |= CPUID_7_0_ECX_WAITPKG;
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+ } else {
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+ ret &= ~CPUID_7_0_ECX_WAITPKG;
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+ }
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} else if (function == 7 && index == 0 && reg == R_EDX) {
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/*
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* Linux v4.17-v4.20 incorrectly return ARCH_CAPABILITIES on SVM hosts.
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--
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1.8.3.1
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