[PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall

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From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	David Brazdil <dbrazdil@google.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Jing Zhang <jingzhangos@google.com>,
	Ajay Patil <pajay@qti.qualcomm.com>,
	Prasad Sodagudi <psodagud@codeaurora.org>,
	Srinivas Ramana <sramana@codeaurora.org>,
	Hector Martin <marcan@marcan.st>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	kernel-team@android.com
Subject: [PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
Date: Mon,  8 Feb 2021 09:57:27 +0000	[thread overview]
Message-ID: <20210208095732.3267263-19-maz@kernel.org> (raw)
In-Reply-To: <20210208095732.3267263-1-maz@kernel.org>

For completeness, let's document the HVC_VHE_RESTART stub.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
---
 Documentation/virt/kvm/arm/hyp-abi.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst
index 83cadd8186fa..4d43fbc25195 100644
--- a/Documentation/virt/kvm/arm/hyp-abi.rst
+++ b/Documentation/virt/kvm/arm/hyp-abi.rst
@@ -58,6 +58,15 @@ these functions (see arch/arm{,64}/include/asm/virt.h):
   into place (arm64 only), and jump to the restart address while at HYP/EL2.
   This hypercall is not expected to return to its caller.
 
+* ::
+
+    x0 = HVC_VHE_RESTART (arm64 only)
+
+  Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling
+  the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU
+  being off, and VHE not being disabled by any other means (command line
+  option, for example).
+
 Any other value of r0/x0 triggers a hypervisor-specific handling,
 which is not documented here.
 
-- 
2.29.2

WARNING: multiple messages have this Message-ID (diff)

From: Marc Zyngier <maz@kernel.org>
To: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Cc: Prasad Sodagudi <psodagud@codeaurora.org>,
	Srinivas Ramana <sramana@codeaurora.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Hector Martin <marcan@marcan.st>,
	Ajay Patil <pajay@qti.qualcomm.com>,
	kernel-team@android.com, Will Deacon <will@kernel.org>,
	Ard Biesheuvel <ardb@kernel.org>
Subject: [PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
Date: Mon,  8 Feb 2021 09:57:27 +0000	[thread overview]
Message-ID: <20210208095732.3267263-19-maz@kernel.org> (raw)
In-Reply-To: <20210208095732.3267263-1-maz@kernel.org>

For completeness, let's document the HVC_VHE_RESTART stub.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
---
 Documentation/virt/kvm/arm/hyp-abi.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst
index 83cadd8186fa..4d43fbc25195 100644
--- a/Documentation/virt/kvm/arm/hyp-abi.rst
+++ b/Documentation/virt/kvm/arm/hyp-abi.rst
@@ -58,6 +58,15 @@ these functions (see arch/arm{,64}/include/asm/virt.h):
   into place (arm64 only), and jump to the restart address while at HYP/EL2.
   This hypercall is not expected to return to its caller.
 
+* ::
+
+    x0 = HVC_VHE_RESTART (arm64 only)
+
+  Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling
+  the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU
+  being off, and VHE not being disabled by any other means (command line
+  option, for example).
+
 Any other value of r0/x0 triggers a hypervisor-specific handling,
 which is not documented here.
 
-- 
2.29.2

_______________________________________________
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: linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org
Cc: Mark Rutland <mark.rutland@arm.com>,
	Jing Zhang <jingzhangos@google.com>,
	Prasad Sodagudi <psodagud@codeaurora.org>,
	Srinivas Ramana <sramana@codeaurora.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Hector Martin <marcan@marcan.st>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	James Morse <james.morse@arm.com>,
	Ajay Patil <pajay@qti.qualcomm.com>,
	kernel-team@android.com, David Brazdil <dbrazdil@google.com>,
	Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: [PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
Date: Mon,  8 Feb 2021 09:57:27 +0000	[thread overview]
Message-ID: <20210208095732.3267263-19-maz@kernel.org> (raw)
In-Reply-To: <20210208095732.3267263-1-maz@kernel.org>

For completeness, let's document the HVC_VHE_RESTART stub.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: David Brazdil <dbrazdil@google.com>
---
 Documentation/virt/kvm/arm/hyp-abi.rst | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst
index 83cadd8186fa..4d43fbc25195 100644
--- a/Documentation/virt/kvm/arm/hyp-abi.rst
+++ b/Documentation/virt/kvm/arm/hyp-abi.rst
@@ -58,6 +58,15 @@ these functions (see arch/arm{,64}/include/asm/virt.h):
   into place (arm64 only), and jump to the restart address while at HYP/EL2.
   This hypercall is not expected to return to its caller.
 
+* ::
+
+    x0 = HVC_VHE_RESTART (arm64 only)
+
+  Attempt to upgrade the kernel's exception level from EL1 to EL2 by enabling
+  the VHE mode. This is conditioned by the CPU supporting VHE, the EL2 MMU
+  being off, and VHE not being disabled by any other means (command line
+  option, for example).
+
 Any other value of r0/x0 triggers a hypervisor-specific handling,
 which is not documented here.
 
-- 
2.29.2


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

next prev parent reply	other threads:[~2021-02-08 10:17 UTC|newest]

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08  9:57 [PATCH v7 00/23] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Marc Zyngier
2021-02-08  9:57 ` Marc Zyngier
2021-02-08  9:57 ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 01/23] arm64: Fix labels in el2_setup macros Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 02/23] arm64: Fix outdated TCR setup comment Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 03/23] arm64: Turn the MMU-on sequence into a macro Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 04/23] arm64: Provide an 'upgrade to VHE' stub hypercall Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 05/23] arm64: Initialise as nVHE before switching to VHE Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 06/23] arm64: Drop early setting of MDSCR_EL2.TPMS Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 07/23] arm64: Move VHE-specific SPE setup to mutate_to_vhe() Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 08/23] arm64: Simplify init_el2_state to be non-VHE only Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 09/23] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 10/23] arm64: cpufeature: Add global feature override facility Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 11/23] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 12/23] arm64: Extract early FDT mapping from kaslr_early_init() Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 13/23] arm64: cpufeature: Add an early command-line cpufeature override facility Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 14/23] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 15/23] arm64: Honor VHE being disabled from the command-line Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 16/23] arm64: Add an aliasing facility for the idreg override Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 17/23] arm64: Make kvm-arm.mode={nvhe, protected} an alias of id_aa64mmfr1.vh=0 Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` Marc Zyngier [this message]
2021-02-08  9:57   ` [PATCH v7 18/23] KVM: arm64: Document HVC_VHE_RESTART stub hypercall Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 19/23] arm64: Move "nokaslr" over to the early cpufeature infrastructure Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 20/23] arm64: cpufeatures: Allow disabling of BTI from the command-line Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 21/23] arm64: Defer enabling pointer authentication on boot core Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 22/23] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57 ` [PATCH v7 23/23] [DO NOT MERGE] arm64: Cope with CPUs stuck in VHE mode Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-08  9:57   ` Marc Zyngier
2021-02-22  9:35   ` Jonathan Neuschäfer
2021-02-22  9:35     ` Jonathan Neuschäfer
2021-02-22  9:35     ` Jonathan Neuschäfer
2021-02-22  9:47     ` Marc Zyngier
2021-02-22  9:47       ` Marc Zyngier
2021-02-22  9:47       ` Marc Zyngier
2021-02-08 14:32 ` [PATCH v7 00/23] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Will Deacon
2021-02-08 14:32   ` Will Deacon
2021-02-08 14:32   ` Will Deacon
2021-02-08 14:40   ` Ard Biesheuvel
2021-02-08 14:40     ` Ard Biesheuvel
2021-02-08 14:40     ` Ard Biesheuvel
2021-02-08 15:02   ` Marc Zyngier
2021-02-08 15:02     ` Marc Zyngier
2021-02-08 15:02     ` Marc Zyngier
2021-02-08 16:30   ` Marc Zyngier
2021-02-08 16:30     ` Marc Zyngier
2021-02-08 16:30     ` Marc Zyngier

find likely ancestor, descendant, or conflicting patches for this message:
dfblob:83cadd8186f dfblob:83cadd8186f dfblob:83cadd8186f
dfblob:4d43fbc2519 dfblob:4d43fbc2519 dfblob:4d43fbc2519
	(help)

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