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From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Cc: Zenghui Yu <yuzenghui@huawei.com>,
	Andrew Jones <drjones@redhat.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: [PATCH 0/2] KVM: arm/arm64: Revamp sysreg reset checks
Date: Mon,  5 Aug 2019 13:15:53 +0100	[thread overview]
Message-ID: <20190805121555.130897-1-maz@kernel.org> (raw)

The way we deal with sysreg reset is terrible, as we write junk to
them while other parts of the system may be evaluating these. That's
obviously wrong. Instead, let's switch to a mode where we track which
sysregs have had a reset function applied to them.

The result is less bad, but my gut feeling is that we'd be better of
without any of this. Comments welcome.

Marc Zyngier (2):
  KVM: arm64: Don't write junk to sysregs on reset
  KVM: arm: Don't write junk to CP15 registers on reset

 arch/arm/kvm/coproc.c     | 23 +++++++++++++++--------
 arch/arm64/kvm/sys_regs.c | 32 ++++++++++++++++++--------------
 2 files changed, 33 insertions(+), 22 deletions(-)

-- 
2.20.1


WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/2] KVM: arm/arm64: Revamp sysreg reset checks
Date: Mon,  5 Aug 2019 13:15:53 +0100	[thread overview]
Message-ID: <20190805121555.130897-1-maz@kernel.org> (raw)

The way we deal with sysreg reset is terrible, as we write junk to
them while other parts of the system may be evaluating these. That's
obviously wrong. Instead, let's switch to a mode where we track which
sysregs have had a reset function applied to them.

The result is less bad, but my gut feeling is that we'd be better of
without any of this. Comments welcome.

Marc Zyngier (2):
  KVM: arm64: Don't write junk to sysregs on reset
  KVM: arm: Don't write junk to CP15 registers on reset

 arch/arm/kvm/coproc.c     | 23 +++++++++++++++--------
 arch/arm64/kvm/sys_regs.c | 32 ++++++++++++++++++--------------
 2 files changed, 33 insertions(+), 22 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: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Cc: Zenghui Yu <yuzenghui@huawei.com>,
	Andrew Jones <drjones@redhat.com>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 0/2] KVM: arm/arm64: Revamp sysreg reset checks
Date: Mon,  5 Aug 2019 13:15:53 +0100	[thread overview]
Message-ID: <20190805121555.130897-1-maz@kernel.org> (raw)

The way we deal with sysreg reset is terrible, as we write junk to
them while other parts of the system may be evaluating these. That's
obviously wrong. Instead, let's switch to a mode where we track which
sysregs have had a reset function applied to them.

The result is less bad, but my gut feeling is that we'd be better of
without any of this. Comments welcome.

Marc Zyngier (2):
  KVM: arm64: Don't write junk to sysregs on reset
  KVM: arm: Don't write junk to CP15 registers on reset

 arch/arm/kvm/coproc.c     | 23 +++++++++++++++--------
 arch/arm64/kvm/sys_regs.c | 32 ++++++++++++++++++--------------
 2 files changed, 33 insertions(+), 22 deletions(-)

-- 
2.20.1


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

             reply	other threads:[~2019-08-05 12:16 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-05 12:15 Marc Zyngier [this message]
2019-08-05 12:15 ` [PATCH 0/2] KVM: arm/arm64: Revamp sysreg reset checks Marc Zyngier
2019-08-05 12:15 ` Marc Zyngier
2019-08-05 12:15 ` [PATCH 1/2] KVM: arm64: Don't write junk to sysregs on reset Marc Zyngier
2019-08-05 12:15   ` Marc Zyngier
2019-08-05 12:15   ` Marc Zyngier
2019-08-06  6:29   ` Zenghui Yu
2019-08-06  6:29     ` Zenghui Yu
2019-08-06  6:29     ` Zenghui Yu
2019-08-06  8:35     ` Marc Zyngier
2019-08-06  8:35       ` Marc Zyngier
2019-08-06  8:35       ` Marc Zyngier
2019-08-06  8:52       ` Zenghui Yu
2019-08-06  8:52         ` Zenghui Yu
2019-08-06  8:52         ` Zenghui Yu
2019-08-05 12:15 ` [PATCH 2/2] KVM: arm: Don't write junk to CP15 registers " Marc Zyngier
2019-08-05 12:15   ` Marc Zyngier
2019-08-05 12:15   ` Marc Zyngier

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