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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu, linux-mm@kvack.org
Cc: Sean Christopherson <seanjc@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Will Deacon <will@kernel.org>,
	Quentin Perret <qperret@google.com>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	kernel-team@android.com
Subject: [PATCH 0/5] KVM: Remove kvm_is_transparent_hugepage() and friends
Date: Sat, 17 Jul 2021 10:55:36 +0100	[thread overview]
Message-ID: <20210717095541.1486210-1-maz@kernel.org> (raw)

A while ago, Willy and Sean pointed out[1] that arm64 is the last user
of kvm_is_transparent_hugepage(), and that there would actually be
some benefit in looking at the userspace mapping directly instead.

This small series does exactly that, although it doesn't try to
support more than a PMD-sized mapping yet for THPs. We could probably
look into unifying this with the huge PUD code, and there is still
some potential use of the contiguous hint.

As a consequence, it removes kvm_is_transparent_hugepage(),
PageTransCompoundMap() and kvm_get_pfn(), all of which have no user
left after this rework.

This has been lightly tested on an Altra box. Although nothing caught
fire, it requires some careful reviewing on the arm64 side.

[1] https://lore.kernel.org/r/YLpLvFPXrIp8nAK4@google.com

Marc Zyngier (5):
  KVM: arm64: Walk userspace page tables to compute the THP mapping size
  KVM: arm64: Avoid mapping size adjustment on permission fault
  KVM: Remove kvm_is_transparent_hugepage() and PageTransCompoundMap()
  KVM: arm64: Use get_page() instead of kvm_get_pfn()
  KVM: Get rid of kvm_get_pfn()

 arch/arm64/kvm/mmu.c       | 57 +++++++++++++++++++++++++++++++++-----
 include/linux/kvm_host.h   |  1 -
 include/linux/page-flags.h | 37 -------------------------
 virt/kvm/kvm_main.c        | 19 +------------
 4 files changed, 51 insertions(+), 63 deletions(-)

-- 
2.30.2


WARNING: multiple messages have this Message-ID
From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu, linux-mm@kvack.org
Cc: kernel-team@android.com, Sean Christopherson <seanjc@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Will Deacon <will@kernel.org>
Subject: [PATCH 0/5] KVM: Remove kvm_is_transparent_hugepage() and friends
Date: Sat, 17 Jul 2021 10:55:36 +0100	[thread overview]
Message-ID: <20210717095541.1486210-1-maz@kernel.org> (raw)

A while ago, Willy and Sean pointed out[1] that arm64 is the last user
of kvm_is_transparent_hugepage(), and that there would actually be
some benefit in looking at the userspace mapping directly instead.

This small series does exactly that, although it doesn't try to
support more than a PMD-sized mapping yet for THPs. We could probably
look into unifying this with the huge PUD code, and there is still
some potential use of the contiguous hint.

As a consequence, it removes kvm_is_transparent_hugepage(),
PageTransCompoundMap() and kvm_get_pfn(), all of which have no user
left after this rework.

This has been lightly tested on an Altra box. Although nothing caught
fire, it requires some careful reviewing on the arm64 side.

[1] https://lore.kernel.org/r/YLpLvFPXrIp8nAK4@google.com

Marc Zyngier (5):
  KVM: arm64: Walk userspace page tables to compute the THP mapping size
  KVM: arm64: Avoid mapping size adjustment on permission fault
  KVM: Remove kvm_is_transparent_hugepage() and PageTransCompoundMap()
  KVM: arm64: Use get_page() instead of kvm_get_pfn()
  KVM: Get rid of kvm_get_pfn()

 arch/arm64/kvm/mmu.c       | 57 +++++++++++++++++++++++++++++++++-----
 include/linux/kvm_host.h   |  1 -
 include/linux/page-flags.h | 37 -------------------------
 virt/kvm/kvm_main.c        | 19 +------------
 4 files changed, 51 insertions(+), 63 deletions(-)

-- 
2.30.2

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID
From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu, linux-mm@kvack.org
Cc: Sean Christopherson <seanjc@google.com>,
	Matthew Wilcox <willy@infradead.org>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Will Deacon <will@kernel.org>,
	Quentin Perret <qperret@google.com>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	kernel-team@android.com
Subject: [PATCH 0/5] KVM: Remove kvm_is_transparent_hugepage() and friends
Date: Sat, 17 Jul 2021 10:55:36 +0100	[thread overview]
Message-ID: <20210717095541.1486210-1-maz@kernel.org> (raw)

A while ago, Willy and Sean pointed out[1] that arm64 is the last user
of kvm_is_transparent_hugepage(), and that there would actually be
some benefit in looking at the userspace mapping directly instead.

This small series does exactly that, although it doesn't try to
support more than a PMD-sized mapping yet for THPs. We could probably
look into unifying this with the huge PUD code, and there is still
some potential use of the contiguous hint.

As a consequence, it removes kvm_is_transparent_hugepage(),
PageTransCompoundMap() and kvm_get_pfn(), all of which have no user
left after this rework.

This has been lightly tested on an Altra box. Although nothing caught
fire, it requires some careful reviewing on the arm64 side.

[1] https://lore.kernel.org/r/YLpLvFPXrIp8nAK4@google.com

Marc Zyngier (5):
  KVM: arm64: Walk userspace page tables to compute the THP mapping size
  KVM: arm64: Avoid mapping size adjustment on permission fault
  KVM: Remove kvm_is_transparent_hugepage() and PageTransCompoundMap()
  KVM: arm64: Use get_page() instead of kvm_get_pfn()
  KVM: Get rid of kvm_get_pfn()

 arch/arm64/kvm/mmu.c       | 57 +++++++++++++++++++++++++++++++++-----
 include/linux/kvm_host.h   |  1 -
 include/linux/page-flags.h | 37 -------------------------
 virt/kvm/kvm_main.c        | 19 +------------
 4 files changed, 51 insertions(+), 63 deletions(-)

-- 
2.30.2


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2021-07-17  9:56 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-17  9:55 Marc Zyngier [this message]
2021-07-17  9:55 ` Marc Zyngier
2021-07-17  9:55 ` Marc Zyngier
2021-07-17  9:55 ` [PATCH 1/5] KVM: arm64: Walk userspace page tables to compute the THP mapping size Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-19  6:31   ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini
2021-07-19  9:31     ` Marc Zyngier
2021-07-19  9:31       ` Marc Zyngier
2021-07-19  9:31       ` Marc Zyngier
2021-07-20 17:23   ` Alexandru Elisei
2021-07-20 17:23     ` Alexandru Elisei
2021-07-20 17:23     ` Alexandru Elisei
2021-07-20 20:33     ` Sean Christopherson
2021-07-20 20:33       ` Sean Christopherson
2021-07-20 20:33       ` Sean Christopherson
2021-07-21 14:58       ` Will Deacon
2021-07-21 14:58         ` Will Deacon
2021-07-21 14:58         ` Will Deacon
2021-07-21 15:56         ` Sean Christopherson
2021-07-21 15:56           ` Sean Christopherson
2021-07-21 15:56           ` Sean Christopherson
2021-07-21 16:37       ` Alexandru Elisei
2021-07-21 16:37         ` Alexandru Elisei
2021-07-21 16:37         ` Alexandru Elisei
2021-07-23  8:48     ` Marc Zyngier
2021-07-23  8:48       ` Marc Zyngier
2021-07-23  8:48       ` Marc Zyngier
2021-07-17  9:55 ` [PATCH 2/5] KVM: arm64: Avoid mapping size adjustment on permission fault Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-23 15:55   ` Alexandru Elisei
2021-07-23 15:55     ` Alexandru Elisei
2021-07-23 15:55     ` Alexandru Elisei
2021-07-23 16:18     ` Marc Zyngier
2021-07-23 16:18       ` Marc Zyngier
2021-07-23 16:18       ` Marc Zyngier
2021-07-17  9:55 ` [PATCH 3/5] KVM: Remove kvm_is_transparent_hugepage() and PageTransCompoundMap() Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-19  6:31   ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini
2021-07-17  9:55 ` [PATCH 4/5] KVM: arm64: Use get_page() instead of kvm_get_pfn() Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55 ` [PATCH 5/5] KVM: Get rid " Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-17  9:55   ` Marc Zyngier
2021-07-19  6:31   ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini
2021-07-19  6:31     ` Paolo Bonzini

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