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From: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
To: <arnd@arndb.de>, <catalin.marinas@arm.com>,
	<gregkh@linuxfoundation.org>, <rostedt@goodmis.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<maz@kernel.org>, <quic_psodagud@quicinc.com>,
	<quic_tsoni@quicinc.com>, <will@kernel.org>,
	Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Subject: [PATCHv12 6/9] KVM: arm64: Add a flag to disable MMIO trace for nVHE KVM
Date: Thu, 28 Apr 2022 15:25:29 +0530	[thread overview]
Message-ID: <1517201c3424214edd2d5385eeb10ac106b67d1c.1651139070.git.quic_saipraka@quicinc.com> (raw)
In-Reply-To: <cover.1651139070.git.quic_saipraka@quicinc.com>

Add a generic flag (__DISABLE_TRACE_MMIO__) to disable MMIO
tracing in nVHE KVM as the tracepoint and MMIO logging symbols
should not be visible at nVHE KVM as there is no way to execute
them. It can also be used to disable MMIO tracing for specific
drivers.

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
---
 arch/arm64/kvm/hyp/nvhe/Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index f9fe4dc21b1f..87d22a18b7a5 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -4,7 +4,12 @@
 #
 
 asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
-ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
+
+# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as
+# there is no way to execute them and any such MMIO access from nVHE KVM
+# will explode instantly (Words of Marc Zyngier). So introduce a generic flag
+# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM.
+ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__
 
 hostprogs := gen-hyprel
 HOST_EXTRACFLAGS += -I$(objtree)/include
-- 
2.33.1


WARNING: multiple messages have this Message-ID (diff)
From: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
To: <arnd@arndb.de>, <catalin.marinas@arm.com>,
	<gregkh@linuxfoundation.org>,  <rostedt@goodmis.org>
Cc: <linux-arm-kernel@lists.infradead.org>,
	<linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<maz@kernel.org>, <quic_psodagud@quicinc.com>,
	<quic_tsoni@quicinc.com>, <will@kernel.org>,
	Sai Prakash Ranjan <quic_saipraka@quicinc.com>
Subject: [PATCHv12 6/9] KVM: arm64: Add a flag to disable MMIO trace for nVHE KVM
Date: Thu, 28 Apr 2022 15:25:29 +0530	[thread overview]
Message-ID: <1517201c3424214edd2d5385eeb10ac106b67d1c.1651139070.git.quic_saipraka@quicinc.com> (raw)
In-Reply-To: <cover.1651139070.git.quic_saipraka@quicinc.com>

Add a generic flag (__DISABLE_TRACE_MMIO__) to disable MMIO
tracing in nVHE KVM as the tracepoint and MMIO logging symbols
should not be visible at nVHE KVM as there is no way to execute
them. It can also be used to disable MMIO tracing for specific
drivers.

Signed-off-by: Sai Prakash Ranjan <quic_saipraka@quicinc.com>
---
 arch/arm64/kvm/hyp/nvhe/Makefile | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index f9fe4dc21b1f..87d22a18b7a5 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -4,7 +4,12 @@
 #
 
 asflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
-ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS
+
+# Tracepoint and MMIO logging symbols should not be visible at nVHE KVM as
+# there is no way to execute them and any such MMIO access from nVHE KVM
+# will explode instantly (Words of Marc Zyngier). So introduce a generic flag
+# __DISABLE_TRACE_MMIO__ to disable MMIO tracing for nVHE KVM.
+ccflags-y := -D__KVM_NVHE_HYPERVISOR__ -D__DISABLE_EXPORTS -D__DISABLE_TRACE_MMIO__
 
 hostprogs := gen-hyprel
 HOST_EXTRACFLAGS += -I$(objtree)/include
-- 
2.33.1


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  parent reply	other threads:[~2022-04-28 10:04 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-28  9:55 [PATCHv12 0/9] lib/rwmmio/arm64: Add support to trace register reads/writes Sai Prakash Ranjan
2022-04-28  9:55 ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 1/9] arm64: io: Use asm-generic high level MMIO accessors Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 2/9] coresight: etm4x: Use asm-generic IO memory barriers Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 3/9] irqchip/tegra: Fix overflow implicit truncation warnings Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 4/9] drm/meson: " Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 5/9] lib: Add register read/write tracing support Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28  9:55 ` Sai Prakash Ranjan [this message]
2022-04-28  9:55   ` [PATCHv12 6/9] KVM: arm64: Add a flag to disable MMIO trace for nVHE KVM Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 7/9] asm-generic/io: Add logging support for MMIO accessors Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28 10:51   ` Greg KH
2022-04-28 10:51     ` Greg KH
2022-04-28 11:21     ` Sai Prakash Ranjan
2022-04-28 11:21       ` Sai Prakash Ranjan
2022-04-28 12:02       ` Greg KH
2022-04-28 12:02         ` Greg KH
2022-04-28 12:29         ` Sai Prakash Ranjan
2022-04-28 12:29           ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 8/9] serial: qcom_geni_serial: Disable MMIO tracing for geni serial Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28 10:50   ` Greg KH
2022-04-28 10:50     ` Greg KH
2022-04-28 11:30     ` Sai Prakash Ranjan
2022-04-28 11:30       ` Sai Prakash Ranjan
2022-04-28 16:31     ` Trilok Soni
2022-04-28 16:31       ` Trilok Soni
2022-04-28 16:49       ` Greg KH
2022-04-28 16:49         ` Greg KH
2022-04-28 17:00         ` Trilok Soni
2022-04-28 17:00           ` Trilok Soni
2022-04-29 13:00           ` Sai Prakash Ranjan
2022-04-29 13:00             ` Sai Prakash Ranjan
2022-04-28  9:55 ` [PATCHv12 9/9] soc: qcom: geni: Disable MMIO tracing for GENI SE Sai Prakash Ranjan
2022-04-28  9:55   ` Sai Prakash Ranjan
2022-04-28 10:50   ` Greg KH
2022-04-28 10:50     ` Greg KH

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