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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Subject: [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
Date: Sun,  1 Sep 2019 22:12:34 +0100	[thread overview]
Message-ID: <20190901211237.11673-1-maz@kernel.org> (raw)

hyp_alternate_select() is a leftover from the my second attempt at
supporting VHE (the first one was never merged, thankfully), and is
now an irrelevant relic. It was a way to patch function pointers
without having to dereference memory, a bit like static keys for
function calls.

Lovely idea, but since Christoffer mostly separated the VHE and !VHE
hypervisor paths, most of the uses of hyp_alternate_select() are
gone. What is left is two instances that are better replaced by
already existing static keys. One of the instances becomes
cpus_have_const_cap(), and the rest is a light sprinkling of
has_vhe().

So off it goes.

Marc Zyngier (3):
  arm64: KVM: Drop hyp_alternate_select for checking for
    ARM64_WORKAROUND_834220
  arm64: KVM: Replace hyp_alternate_select with has_vhe()
  arm64: KVM: Kill hyp_alternate_select()

 arch/arm64/include/asm/kvm_hyp.h | 24 ---------------------
 arch/arm64/kvm/hyp/switch.c      | 17 ++-------------
 arch/arm64/kvm/hyp/tlb.c         | 36 +++++++++++++++++++-------------
 3 files changed, 24 insertions(+), 53 deletions(-)

-- 
2.20.1

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

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
Date: Sun,  1 Sep 2019 22:12:34 +0100	[thread overview]
Message-ID: <20190901211237.11673-1-maz@kernel.org> (raw)

hyp_alternate_select() is a leftover from the my second attempt at
supporting VHE (the first one was never merged, thankfully), and is
now an irrelevant relic. It was a way to patch function pointers
without having to dereference memory, a bit like static keys for
function calls.

Lovely idea, but since Christoffer mostly separated the VHE and !VHE
hypervisor paths, most of the uses of hyp_alternate_select() are
gone. What is left is two instances that are better replaced by
already existing static keys. One of the instances becomes
cpus_have_const_cap(), and the rest is a light sprinkling of
has_vhe().

So off it goes.

Marc Zyngier (3):
  arm64: KVM: Drop hyp_alternate_select for checking for
    ARM64_WORKAROUND_834220
  arm64: KVM: Replace hyp_alternate_select with has_vhe()
  arm64: KVM: Kill hyp_alternate_select()

 arch/arm64/include/asm/kvm_hyp.h | 24 ---------------------
 arch/arm64/kvm/hyp/switch.c      | 17 ++-------------
 arch/arm64/kvm/hyp/tlb.c         | 36 +++++++++++++++++++-------------
 3 files changed, 24 insertions(+), 53 deletions(-)

-- 
2.20.1


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

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye
Date: Sun,  1 Sep 2019 22:12:34 +0100	[thread overview]
Message-ID: <20190901211237.11673-1-maz@kernel.org> (raw)

hyp_alternate_select() is a leftover from the my second attempt at
supporting VHE (the first one was never merged, thankfully), and is
now an irrelevant relic. It was a way to patch function pointers
without having to dereference memory, a bit like static keys for
function calls.

Lovely idea, but since Christoffer mostly separated the VHE and !VHE
hypervisor paths, most of the uses of hyp_alternate_select() are
gone. What is left is two instances that are better replaced by
already existing static keys. One of the instances becomes
cpus_have_const_cap(), and the rest is a light sprinkling of
has_vhe().

So off it goes.

Marc Zyngier (3):
  arm64: KVM: Drop hyp_alternate_select for checking for
    ARM64_WORKAROUND_834220
  arm64: KVM: Replace hyp_alternate_select with has_vhe()
  arm64: KVM: Kill hyp_alternate_select()

 arch/arm64/include/asm/kvm_hyp.h | 24 ---------------------
 arch/arm64/kvm/hyp/switch.c      | 17 ++-------------
 arch/arm64/kvm/hyp/tlb.c         | 36 +++++++++++++++++++-------------
 3 files changed, 24 insertions(+), 53 deletions(-)

-- 
2.20.1


             reply	other threads:[~2019-09-01 21:13 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-01 21:12 Marc Zyngier [this message]
2019-09-01 21:12 ` [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye Marc Zyngier
2019-09-01 21:12 ` Marc Zyngier
2019-09-01 21:12 ` [PATCH 1/3] arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220 Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12 ` [PATCH 2/3] arm64: KVM: Replace hyp_alternate_select with has_vhe() Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12 ` [PATCH 3/3] arm64: KVM: Kill hyp_alternate_select() Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-02  8:00 ` [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye Christoffer Dall
2019-09-02  8:00   ` Christoffer Dall
2019-09-02  8:00   ` Christoffer Dall
2019-09-02  8:34 ` Andrew Jones
2019-09-02  8:34   ` Andrew Jones
2019-09-02  8:34   ` Andrew Jones

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