From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: bgardon@google.com
Subject: [PATCH 03/22] KVM: mmu: Separate updating a PTE from kvm_set_pte_rmapp
Date: Fri, 23 Oct 2020 12:30:05 -0400 [thread overview]
Message-ID: <20201023163024.2765558-4-pbonzini@redhat.com> (raw)
In-Reply-To: <20201023163024.2765558-1-pbonzini@redhat.com>
The TDP MMU's own function for the changed-PTE notifier will need to be
update a PTE in the exact same way as the shadow MMU. Rather than
re-implementing this logic, factor the SPTE creation out of kvm_set_pte_rmapp.
Extracted out of a patch by Ben Gardon. <bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/mmu/mmu.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index ef4a63af8fce..3dec4744ab9c 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -1747,6 +1747,21 @@ static int kvm_unmap_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
return kvm_zap_rmapp(kvm, rmap_head);
}
+static u64 kvm_mmu_changed_pte_notifier_make_spte(u64 old_spte, kvm_pfn_t new_pfn)
+{
+ u64 new_spte;
+
+ new_spte = old_spte & ~PT64_BASE_ADDR_MASK;
+ new_spte |= (u64)new_pfn << PAGE_SHIFT;
+
+ new_spte &= ~PT_WRITABLE_MASK;
+ new_spte &= ~SPTE_HOST_WRITEABLE;
+
+ new_spte = mark_spte_for_access_track(new_spte);
+
+ return new_spte;
+}
+
static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
struct kvm_memory_slot *slot, gfn_t gfn, int level,
unsigned long data)
@@ -1772,13 +1787,8 @@ static int kvm_set_pte_rmapp(struct kvm *kvm, struct kvm_rmap_head *rmap_head,
pte_list_remove(rmap_head, sptep);
goto restart;
} else {
- new_spte = *sptep & ~PT64_BASE_ADDR_MASK;
- new_spte |= (u64)new_pfn << PAGE_SHIFT;
-
- new_spte &= ~PT_WRITABLE_MASK;
- new_spte &= ~SPTE_HOST_WRITEABLE;
-
- new_spte = mark_spte_for_access_track(new_spte);
+ new_spte = kvm_mmu_changed_pte_notifier_make_spte(
+ *sptep, new_pfn);
mmu_spte_clear_track_bits(sptep);
mmu_spte_set(sptep, new_spte);
--
2.26.2
next prev parent reply other threads:[~2020-10-23 16:32 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-23 16:30 [PATCH 00/22] Introduce the TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 01/22] kvm: mmu: Separate making non-leaf sptes from link_shadow_page Paolo Bonzini
2020-10-23 16:30 ` [PATCH 02/22] kvm: x86/mmu: Separate making SPTEs from set_spte Paolo Bonzini
2020-10-23 16:30 ` Paolo Bonzini [this message]
2020-10-23 16:30 ` [PATCH 04/22] KVM: mmu: extract spte.h and spte.c Paolo Bonzini
2020-10-27 14:46 ` Valdis Klētnieks
2020-10-28 17:36 ` Paolo Bonzini
2020-10-23 16:30 ` [PATCH 05/22] kvm: x86/mmu: Introduce tdp_iter Paolo Bonzini
2020-10-23 16:30 ` [PATCH 06/22] kvm: x86/mmu: Init / Uninit the TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 07/22] kvm: x86/mmu: Allocate and free TDP MMU roots Paolo Bonzini
2020-10-23 16:30 ` [PATCH 08/22] kvm: x86/mmu: Add functions to handle changed TDP SPTEs Paolo Bonzini
2020-10-23 16:30 ` [PATCH 09/22] KVM: Cache as_id in kvm_memory_slot Paolo Bonzini
2020-10-23 16:30 ` [PATCH 10/22] kvm: x86/mmu: Support zapping SPTEs in the TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 11/22] kvm: x86/mmu: Remove disallowed_hugepage_adjust shadow_walk_iterator arg Paolo Bonzini
2020-10-23 16:30 ` [PATCH 12/22] kvm: x86/mmu: Add TDP MMU PF handler Paolo Bonzini
2020-10-23 16:30 ` [PATCH 13/22] kvm: x86/mmu: Allocate struct kvm_mmu_pages for all pages in TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 14/22] kvm: x86/mmu: Support invalidate range MMU notifier for " Paolo Bonzini
2020-10-23 16:30 ` [PATCH 15/22] kvm: x86/mmu: Add access tracking for tdp_mmu Paolo Bonzini
2020-10-23 16:30 ` [PATCH 16/22] kvm: x86/mmu: Support changed pte notifier in tdp MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 17/22] kvm: x86/mmu: Support dirty logging for the TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 18/22] kvm: x86/mmu: Support disabling dirty logging for the tdp MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 19/22] kvm: x86/mmu: Support write protection for nesting in " Paolo Bonzini
2020-10-23 16:30 ` [PATCH 20/22] kvm: x86/mmu: Support MMIO in the TDP MMU Paolo Bonzini
2020-10-23 16:30 ` [PATCH 21/22] kvm: x86/mmu: Don't clear write flooding count for direct roots Paolo Bonzini
2020-10-23 16:30 ` [PATCH 22/22] kvm: x86/mmu: NX largepage recovery for TDP MMU Paolo Bonzini
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