From: Sean Christopherson <seanjc@google.com>
To: Marc Zyngier <maz@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
Paul Mackerras <paulus@ozlabs.org>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: James Morse <james.morse@arm.com>,
Julien Thierry <julien.thierry.kdev@gmail.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
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>,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org,
kvm@vger.kernel.org, kvm-ppc@vger.kernel.org,
linux-kernel@vger.kernel.org, Ben Gardon <bgardon@google.com>
Subject: [PATCH v2 03/10] KVM: arm64: Convert to the gfn-based MMU notifier callbacks
Date: Thu, 1 Apr 2021 17:56:51 -0700 [thread overview]
Message-ID: <20210402005658.3024832-4-seanjc@google.com> (raw)
In-Reply-To: <20210402005658.3024832-1-seanjc@google.com>
Move arm64 to the gfn-base MMU notifier APIs, which do the hva->gfn
lookup in common code.
No meaningful functional change intended, though the exact order of
operations is slightly different since the memslot lookups occur before
calling into arch code.
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/arm64/include/asm/kvm_host.h | 1 +
arch/arm64/kvm/mmu.c | 117 ++++++++----------------------
2 files changed, 33 insertions(+), 85 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 72e6b4600264..1ad729cf7b0d 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -582,6 +582,7 @@ int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events);
#define KVM_ARCH_WANT_MMU_NOTIFIER
+#define KVM_ARCH_WANT_NEW_MMU_NOTIFIER_APIS
void kvm_arm_halt_guest(struct kvm *kvm);
void kvm_arm_resume_guest(struct kvm *kvm);
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index 4b7e1e327337..35728231e9a0 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -839,7 +839,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
* gfn_to_pfn_prot (which calls get_user_pages), so that we don't risk
* the page we just got a reference to gets unmapped before we have a
* chance to grab the mmu_lock, which ensure that if the page gets
- * unmapped afterwards, the call to kvm_unmap_hva will take it away
+ * unmapped afterwards, the call to kvm_unmap_gfn will take it away
* from us again properly. This smp_rmb() interacts with the smp_wmb()
* in kvm_mmu_notifier_invalidate_<page|range_end>.
*/
@@ -1064,123 +1064,70 @@ int kvm_handle_guest_abort(struct kvm_vcpu *vcpu)
return ret;
}
-static int handle_hva_to_gpa(struct kvm *kvm,
- unsigned long start,
- unsigned long end,
- int (*handler)(struct kvm *kvm,
- gpa_t gpa, u64 size,
- void *data),
- void *data)
-{
- struct kvm_memslots *slots;
- struct kvm_memory_slot *memslot;
- int ret = 0;
-
- slots = kvm_memslots(kvm);
-
- /* we only care about the pages that the guest sees */
- kvm_for_each_memslot(memslot, slots) {
- unsigned long hva_start, hva_end;
- gfn_t gpa;
-
- hva_start = max(start, memslot->userspace_addr);
- hva_end = min(end, memslot->userspace_addr +
- (memslot->npages << PAGE_SHIFT));
- if (hva_start >= hva_end)
- continue;
-
- gpa = hva_to_gfn_memslot(hva_start, memslot) << PAGE_SHIFT;
- ret |= handler(kvm, gpa, (u64)(hva_end - hva_start), data);
- }
-
- return ret;
-}
-
-static int kvm_unmap_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
-{
- unsigned flags = *(unsigned *)data;
- bool may_block = flags & MMU_NOTIFIER_RANGE_BLOCKABLE;
-
- __unmap_stage2_range(&kvm->arch.mmu, gpa, size, may_block);
- return 0;
-}
-
-int kvm_unmap_hva_range(struct kvm *kvm,
- unsigned long start, unsigned long end, unsigned flags)
+bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
{
if (!kvm->arch.mmu.pgt)
return 0;
- handle_hva_to_gpa(kvm, start, end, &kvm_unmap_hva_handler, &flags);
- return 0;
-}
+ __unmap_stage2_range(&kvm->arch.mmu, range->start << PAGE_SHIFT,
+ (range->end - range->start) << PAGE_SHIFT,
+ range->may_block);
-static int kvm_set_spte_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
-{
- kvm_pfn_t *pfn = (kvm_pfn_t *)data;
-
- WARN_ON(size != PAGE_SIZE);
-
- /*
- * The MMU notifiers will have unmapped a huge PMD before calling
- * ->change_pte() (which in turn calls kvm_set_spte_hva()) and
- * therefore we never need to clear out a huge PMD through this
- * calling path and a memcache is not required.
- */
- kvm_pgtable_stage2_map(kvm->arch.mmu.pgt, gpa, PAGE_SIZE,
- __pfn_to_phys(*pfn), KVM_PGTABLE_PROT_R, NULL);
return 0;
}
-int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte)
+bool kvm_set_spte_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
- unsigned long end = hva + PAGE_SIZE;
- kvm_pfn_t pfn = pte_pfn(pte);
+ kvm_pfn_t pfn = pte_pfn(range->pte);
if (!kvm->arch.mmu.pgt)
return 0;
+ WARN_ON(range->end - range->start != 1);
+
/*
* We've moved a page around, probably through CoW, so let's treat it
* just like a translation fault and clean the cache to the PoC.
*/
clean_dcache_guest_page(pfn, PAGE_SIZE);
- handle_hva_to_gpa(kvm, hva, end, &kvm_set_spte_handler, &pfn);
+
+ /*
+ * The MMU notifiers will have unmapped a huge PMD before calling
+ * ->change_pte() (which in turn calls kvm_set_spte_gfn()) and
+ * therefore we never need to clear out a huge PMD through this
+ * calling path and a memcache is not required.
+ */
+ kvm_pgtable_stage2_map(kvm->arch.mmu.pgt, range->start << PAGE_SHIFT,
+ PAGE_SIZE, __pfn_to_phys(pfn),
+ KVM_PGTABLE_PROT_R, NULL);
+
return 0;
}
-static int kvm_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
+bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
- pte_t pte;
+ u64 size = (range->end - range->start) << PAGE_SHIFT;
kvm_pte_t kpte;
+ pte_t pte;
+
+ if (!kvm->arch.mmu.pgt)
+ return 0;
WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
- kpte = kvm_pgtable_stage2_mkold(kvm->arch.mmu.pgt, gpa);
+
+ kpte = kvm_pgtable_stage2_mkold(kvm->arch.mmu.pgt,
+ range->start << PAGE_SHIFT);
pte = __pte(kpte);
return pte_valid(pte) && pte_young(pte);
}
-static int kvm_test_age_hva_handler(struct kvm *kvm, gpa_t gpa, u64 size, void *data)
-{
- WARN_ON(size != PAGE_SIZE && size != PMD_SIZE && size != PUD_SIZE);
- return kvm_pgtable_stage2_is_young(kvm->arch.mmu.pgt, gpa);
-}
-
-int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end)
-{
- if (!kvm->arch.mmu.pgt)
- return 0;
-
- return handle_hva_to_gpa(kvm, start, end, kvm_age_hva_handler, NULL);
-}
-
-int kvm_test_age_hva(struct kvm *kvm, unsigned long hva)
+bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
{
if (!kvm->arch.mmu.pgt)
return 0;
- return handle_hva_to_gpa(kvm, hva, hva + PAGE_SIZE,
- kvm_test_age_hva_handler, NULL);
+ return kvm_pgtable_stage2_is_young(kvm->arch.mmu.pgt,
+ range->start << PAGE_SHIFT);
}
phys_addr_t kvm_mmu_get_httbr(void)
--
2.31.0.208.g409f899ff0-goog
next prev parent reply other threads:[~2021-04-02 0:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-02 0:56 [PATCH v2 00/10] KVM: Consolidate and optimize MMU notifiers Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 01/10] KVM: Assert that notifier count is elevated in .change_pte() Sean Christopherson
2021-04-02 11:08 ` Paolo Bonzini
2021-04-02 0:56 ` [PATCH v2 02/10] KVM: Move x86's MMU notifier memslot walkers to generic code Sean Christopherson
2021-04-02 0:56 ` Sean Christopherson [this message]
2021-04-12 10:12 ` [PATCH v2 03/10] KVM: arm64: Convert to the gfn-based MMU notifier callbacks Marc Zyngier
2021-04-02 0:56 ` [PATCH v2 04/10] KVM: MIPS/MMU: " Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 05/10] KVM: PPC: " Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 06/10] KVM: Kill off the old hva-based " Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 07/10] KVM: Move MMU notifier's mmu_lock acquisition into common helper Sean Christopherson
2021-04-02 9:35 ` Paolo Bonzini
2021-04-02 14:59 ` Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 08/10] KVM: Take mmu_lock when handling MMU notifier iff the hva hits a memslot Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 09/10] KVM: Don't take mmu_lock for range invalidation unless necessary Sean Christopherson
2021-04-02 9:34 ` Paolo Bonzini
2021-04-02 14:59 ` Sean Christopherson
2021-04-19 8:49 ` Wanpeng Li
2021-04-19 13:50 ` Paolo Bonzini
2021-04-19 15:09 ` Sean Christopherson
2021-04-19 22:09 ` Paolo Bonzini
2021-04-20 1:17 ` Sean Christopherson
2021-04-02 0:56 ` [PATCH v2 10/10] KVM: x86/mmu: Allow yielding during MMU notifier unmap/zap, if possible Sean Christopherson
2021-04-02 12:17 ` [PATCH v2 00/10] KVM: Consolidate and optimize MMU notifiers Paolo Bonzini
2021-04-12 10:27 ` Marc Zyngier
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210402005658.3024832-4-seanjc@google.com \
--to=seanjc@google.com \
--cc=aleksandar.qemu.devel@gmail.com \
--cc=bgardon@google.com \
--cc=chenhuacai@kernel.org \
--cc=james.morse@arm.com \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=julien.thierry.kdev@gmail.com \
--cc=kvm-ppc@vger.kernel.org \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=maz@kernel.org \
--cc=paulus@ozlabs.org \
--cc=pbonzini@redhat.com \
--cc=suzuki.poulose@arm.com \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).