From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>
Cc: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
David Hildenbrand <david@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
David Matlack <dmatlack@google.com>,
Ben Gardon <bgardon@google.com>,
Mingwei Zhang <mizhang@google.com>
Subject: [PATCH v3 27/28] KVM: selftests: Define cpu_relax() helpers for s390 and x86
Date: Sat, 26 Feb 2022 00:15:45 +0000 [thread overview]
Message-ID: <20220226001546.360188-28-seanjc@google.com> (raw)
In-Reply-To: <20220226001546.360188-1-seanjc@google.com>
Add cpu_relax() for s390 and x86 for use in arch-agnostic tests. arm64
already defines its own version.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/include/s390x/processor.h | 8 ++++++++
tools/testing/selftests/kvm/include/x86_64/processor.h | 5 +++++
2 files changed, 13 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/s390x/processor.h b/tools/testing/selftests/kvm/include/s390x/processor.h
index e0e96a5f608c..255c9b990f4c 100644
--- a/tools/testing/selftests/kvm/include/s390x/processor.h
+++ b/tools/testing/selftests/kvm/include/s390x/processor.h
@@ -5,6 +5,8 @@
#ifndef SELFTEST_KVM_PROCESSOR_H
#define SELFTEST_KVM_PROCESSOR_H
+#include <linux/compiler.h>
+
/* Bits in the region/segment table entry */
#define REGION_ENTRY_ORIGIN ~0xfffUL /* region/segment table origin */
#define REGION_ENTRY_PROTECT 0x200 /* region protection bit */
@@ -19,4 +21,10 @@
#define PAGE_PROTECT 0x200 /* HW read-only bit */
#define PAGE_NOEXEC 0x100 /* HW no-execute bit */
+/* Is there a portable way to do this? */
+static inline void cpu_relax(void)
+{
+ barrier();
+}
+
#endif
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 8a470da7b71a..37db341d4cc5 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -363,6 +363,11 @@ static inline unsigned long get_xmm(int n)
return 0;
}
+static inline void cpu_relax(void)
+{
+ asm volatile("rep; nop" ::: "memory");
+}
+
bool is_intel_cpu(void);
bool is_amd_cpu(void);
--
2.35.1.574.g5d30c73bfb-goog
next prev parent reply other threads:[~2022-02-26 0:18 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-26 0:15 [PATCH v3 00/28] KVM: x86/mmu: Overhaul TDP MMU zapping and flushing Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 01/28] KVM: x86/mmu: Use common iterator for walking invalid TDP MMU roots Sean Christopherson
2022-03-02 19:08 ` Mingwei Zhang
2022-03-02 19:51 ` Sean Christopherson
2022-03-03 0:57 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 02/28] KVM: x86/mmu: Check for present SPTE when clearing dirty bit in TDP MMU Sean Christopherson
2022-03-02 19:50 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 03/28] KVM: x86/mmu: Fix wrong/misleading comments in TDP MMU fast zap Sean Christopherson
2022-02-28 23:15 ` Ben Gardon
2022-02-26 0:15 ` [PATCH v3 04/28] KVM: x86/mmu: Formalize TDP MMU's (unintended?) deferred TLB flush logic Sean Christopherson
2022-03-02 23:59 ` Mingwei Zhang
2022-03-03 0:12 ` Sean Christopherson
2022-03-03 1:20 ` Mingwei Zhang
2022-03-03 1:41 ` Sean Christopherson
2022-03-03 4:50 ` Mingwei Zhang
2022-03-03 16:45 ` Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 05/28] KVM: x86/mmu: Document that zapping invalidated roots doesn't need to flush Sean Christopherson
2022-02-28 23:17 ` Ben Gardon
2022-02-26 0:15 ` [PATCH v3 06/28] KVM: x86/mmu: Require mmu_lock be held for write in unyielding root iter Sean Christopherson
2022-02-28 23:26 ` Ben Gardon
2022-02-26 0:15 ` [PATCH v3 07/28] KVM: x86/mmu: Check for !leaf=>leaf, not PFN change, in TDP MMU SP removal Sean Christopherson
2022-03-01 0:11 ` Ben Gardon
2022-03-03 18:02 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 08/28] KVM: x86/mmu: Batch TLB flushes from TDP MMU for MMU notifier change_spte Sean Christopherson
2022-03-03 18:08 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 09/28] KVM: x86/mmu: Drop RCU after processing each root in MMU notifier hooks Sean Christopherson
2022-03-03 18:24 ` Mingwei Zhang
2022-03-03 18:32 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 10/28] KVM: x86/mmu: Add helpers to read/write TDP MMU SPTEs and document RCU Sean Christopherson
2022-03-03 18:34 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 11/28] KVM: x86/mmu: WARN if old _or_ new SPTE is REMOVED in non-atomic path Sean Christopherson
2022-03-03 18:37 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 12/28] KVM: x86/mmu: Refactor low-level TDP MMU set SPTE helper to take raw vals Sean Christopherson
2022-03-03 18:47 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 13/28] KVM: x86/mmu: Zap only the target TDP MMU shadow page in NX recovery Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 14/28] KVM: x86/mmu: Skip remote TLB flush when zapping all of TDP MMU Sean Christopherson
2022-03-01 0:19 ` Ben Gardon
2022-03-03 18:50 ` Mingwei Zhang
2022-02-26 0:15 ` [PATCH v3 15/28] KVM: x86/mmu: Add dedicated helper to zap TDP MMU root shadow page Sean Christopherson
2022-03-01 0:32 ` Ben Gardon
2022-03-03 21:19 ` Mingwei Zhang
2022-03-03 21:24 ` Mingwei Zhang
2022-03-03 23:06 ` Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 16/28] KVM: x86/mmu: Require mmu_lock be held for write to zap TDP MMU range Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 17/28] KVM: x86/mmu: Zap only TDP MMU leafs in kvm_zap_gfn_range() Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 18/28] KVM: x86/mmu: Do remote TLB flush before dropping RCU in TDP MMU resched Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 19/28] KVM: x86/mmu: Defer TLB flush to caller when freeing TDP MMU shadow pages Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 20/28] KVM: x86/mmu: Allow yielding when zapping GFNs for defunct TDP MMU root Sean Christopherson
2022-03-01 18:21 ` Paolo Bonzini
2022-03-01 19:43 ` Sean Christopherson
2022-03-01 20:12 ` Paolo Bonzini
2022-03-02 2:13 ` Sean Christopherson
2022-03-02 14:54 ` Paolo Bonzini
2022-03-02 17:43 ` Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 21/28] KVM: x86/mmu: Zap roots in two passes to avoid inducing RCU stalls Sean Christopherson
2022-03-01 0:43 ` Ben Gardon
2022-02-26 0:15 ` [PATCH v3 22/28] KVM: x86/mmu: Zap defunct roots via asynchronous worker Sean Christopherson
2022-03-01 17:57 ` Ben Gardon
2022-03-02 17:25 ` Paolo Bonzini
2022-03-02 17:35 ` Sean Christopherson
2022-03-02 18:33 ` David Matlack
2022-03-02 18:36 ` Paolo Bonzini
2022-03-02 18:01 ` Sean Christopherson
2022-03-02 18:20 ` Paolo Bonzini
2022-03-02 19:33 ` Sean Christopherson
2022-03-02 20:14 ` Paolo Bonzini
2022-03-02 20:47 ` Sean Christopherson
2022-03-02 21:22 ` Paolo Bonzini
2022-03-02 22:25 ` Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 23/28] KVM: x86/mmu: Check for a REMOVED leaf SPTE before making the SPTE Sean Christopherson
2022-03-01 18:06 ` Ben Gardon
2022-02-26 0:15 ` [PATCH v3 24/28] KVM: x86/mmu: WARN on any attempt to atomically update REMOVED SPTE Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 25/28] KVM: selftests: Move raw KVM_SET_USER_MEMORY_REGION helper to utils Sean Christopherson
2022-02-26 0:15 ` [PATCH v3 26/28] KVM: selftests: Split out helper to allocate guest mem via memfd Sean Christopherson
2022-02-28 23:36 ` David Woodhouse
2022-03-02 18:36 ` Paolo Bonzini
2022-03-02 21:55 ` David Woodhouse
2022-02-26 0:15 ` Sean Christopherson [this message]
2022-02-26 0:15 ` [PATCH v3 28/28] KVM: selftests: Add test to populate a VM with the max possible guest mem Sean Christopherson
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