From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.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>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Ben Gardon <bgardon@google.com>,
David Matlack <dmatlack@google.com>,
Mingwei Zhang <mizhang@google.com>
Subject: [PATCH v2 01/30] KVM: x86/mmu: Use common TDP MMU zap helper for MMU notifier unmap hook
Date: Thu, 23 Dec 2021 22:22:49 +0000 [thread overview]
Message-ID: <20211223222318.1039223-2-seanjc@google.com> (raw)
In-Reply-To: <20211223222318.1039223-1-seanjc@google.com>
Use the common TDP MMU zap helper when handling an MMU notifier unmap
event, the two flows are semantically identical. Consolidate the code in
preparation for a future bug fix, as both kvm_tdp_mmu_unmap_gfn_range()
and __kvm_tdp_mmu_zap_gfn_range() are guilty of not zapping SPTEs in
invalid roots.
No functional change intended.
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/mmu/tdp_mmu.c | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 7b1bc816b7c3..d320b56d5cd7 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -1032,13 +1032,8 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault)
bool kvm_tdp_mmu_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range,
bool flush)
{
- struct kvm_mmu_page *root;
-
- for_each_tdp_mmu_root_yield_safe(kvm, root, range->slot->as_id, false)
- flush = zap_gfn_range(kvm, root, range->start, range->end,
- range->may_block, flush, false);
-
- return flush;
+ return __kvm_tdp_mmu_zap_gfn_range(kvm, range->slot->as_id, range->start,
+ range->end, range->may_block, flush);
}
typedef bool (*tdp_handler_t)(struct kvm *kvm, struct tdp_iter *iter,
--
2.34.1.448.ga2b2bfdf31-goog
next prev parent reply other threads:[~2021-12-23 22:23 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-23 22:22 [PATCH v2 00/30] KVM: x86/mmu: Overhaul TDP MMU zapping and flushing Sean Christopherson
2021-12-23 22:22 ` Sean Christopherson [this message]
2021-12-23 22:22 ` [PATCH v2 02/30] KVM: x86/mmu: Move "invalid" check out of kvm_tdp_mmu_get_root() Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 03/30] KVM: x86/mmu: Zap _all_ roots when unmapping gfn range in TDP MMU Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 04/30] KVM: x86/mmu: Use common iterator for walking invalid TDP MMU roots Sean Christopherson
2022-01-04 22:13 ` David Matlack
2021-12-23 22:22 ` [PATCH v2 05/30] KVM: x86/mmu: Check for present SPTE when clearing dirty bit in TDP MMU Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 06/30] KVM: x86/mmu: Fix wrong/misleading comments in TDP MMU fast zap Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 07/30] KVM: x86/mmu: Formalize TDP MMU's (unintended?) deferred TLB flush logic Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 08/30] KVM: x86/mmu: Document that zapping invalidated roots doesn't need to flush Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 09/30] KVM: x86/mmu: Drop unused @kvm param from kvm_tdp_mmu_get_root() Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 10/30] KVM: x86/mmu: Require mmu_lock be held for write in unyielding root iter Sean Christopherson
2021-12-23 22:22 ` [PATCH v2 11/30] KVM: x86/mmu: Check for !leaf=>leaf, not PFN change, in TDP MMU SP removal Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 12/30] KVM: x86/mmu: Batch TLB flushes from TDP MMU for MMU notifier change_spte Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 13/30] KVM: x86/mmu: Drop RCU after processing each root in MMU notifier hooks Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 14/30] KVM: x86/mmu: Add helpers to read/write TDP MMU SPTEs and document RCU Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 15/30] KVM: x86/mmu: WARN if old _or_ new SPTE is REMOVED in non-atomic path Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 16/30] KVM: x86/mmu: Refactor low-level TDP MMU set SPTE helper to take raw vals Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 17/30] KVM: x86/mmu: Zap only the target TDP MMU shadow page in NX recovery Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 18/30] KVM: x86/mmu: Skip remote TLB flush when zapping all of TDP MMU Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 19/30] KVM: x86/mmu: Add dedicated helper to zap TDP MMU root shadow page Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 20/30] KVM: x86/mmu: Require mmu_lock be held for write to zap TDP MMU range Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 21/30] KVM: x86/mmu: Zap only TDP MMU leafs in kvm_zap_gfn_range() Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 22/30] KVM: x86/mmu: Do remote TLB flush before dropping RCU in TDP MMU resched Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 23/30] KVM: x86/mmu: Defer TLB flush to caller when freeing TDP MMU shadow pages Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 24/30] KVM: x86/mmu: Allow yielding when zapping GFNs for defunct TDP MMU root Sean Christopherson
2022-01-05 1:25 ` David Matlack
2022-01-05 21:32 ` Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 25/30] KVM: x86/mmu: Zap roots in two passes to avoid inducing RCU stalls Sean Christopherson
2022-01-05 0:19 ` David Matlack
2022-01-05 16:33 ` Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 26/30] KVM: x86/mmu: Zap defunct roots via asynchronous worker Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 27/30] KVM: selftests: Move raw KVM_SET_USER_MEMORY_REGION helper to utils Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 28/30] KVM: selftests: Split out helper to allocate guest mem via memfd Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 29/30] KVM: selftests: Define cpu_relax() helpers for s390 and x86 Sean Christopherson
2021-12-23 22:23 ` [PATCH v2 30/30] KVM: selftests: Add test to populate a VM with the max possible guest mem Sean Christopherson
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