From: David Brazdil <dbrazdil@google.com>
To: Marc Zyngier <maz@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Mark Rutland <mark.rutland@arm.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>,
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: Re: [PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall
Date: Mon, 18 Jan 2021 13:29:35 +0000 [thread overview]
Message-ID: <20210118132935.mutemf7j7wtyz7wz@google.com> (raw)
In-Reply-To: <20210118094533.2874082-18-maz@kernel.org>
On Mon, Jan 18, 2021 at 09:45:29AM +0000, Marc Zyngier wrote:
> 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..1ba628baf11b 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 mean (comment line option,
'means' (both singular and plural), and 'command line'
> + for example).
> +
> Any other value of r0/x0 triggers a hypervisor-specific handling,
> which is not documented here.
>
> --
> 2.29.2
>
next prev parent reply other threads:[~2021-01-18 13:33 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-18 9:45 [PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 01/21] arm64: Fix labels in el2_setup macros Marc Zyngier
2021-01-18 11:13 ` David Brazdil
2021-01-18 9:45 ` [PATCH v4 02/21] arm64: Fix outdated TCR setup comment Marc Zyngier
2021-01-20 18:18 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 03/21] arm64: Turn the MMU-on sequence into a macro Marc Zyngier
2021-01-20 18:18 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 04/21] arm64: Provide an 'upgrade to VHE' stub hypercall Marc Zyngier
2021-01-18 11:25 ` David Brazdil
2021-01-24 18:44 ` Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 05/21] arm64: Initialise as nVHE before switching to VHE Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 06/21] arm64: Move VHE-specific SPE setup to mutate_to_vhe() Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 07/21] arm64: Simplify init_el2_state to be non-VHE only Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 08/21] arm64: Move SCTLR_EL1 initialisation to EL-agnostic code Marc Zyngier
2021-01-20 18:35 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 09/21] arm64: cpufeature: Add global feature override facility Marc Zyngier
2021-01-22 18:41 ` Catalin Marinas
2021-01-23 15:59 ` Suzuki K Poulose
2021-01-18 9:45 ` [PATCH v4 10/21] arm64: cpufeature: Use IDreg override in __read_sysreg_by_encoding() Marc Zyngier
2021-01-22 18:53 ` Catalin Marinas
2021-01-23 16:04 ` Suzuki K Poulose
2021-01-18 9:45 ` [PATCH v4 11/21] arm64: Extract early FDT mapping from kaslr_early_init() Marc Zyngier
2021-01-22 18:55 ` Catalin Marinas
2021-01-23 13:25 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 12/21] arm64: cpufeature: Add an early command-line cpufeature override facility Marc Zyngier
2021-01-18 13:07 ` David Brazdil
2021-01-23 13:23 ` Catalin Marinas
2021-01-23 13:43 ` Catalin Marinas
2021-01-24 16:21 ` Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 13/21] arm64: Allow ID_AA64MMFR1_EL1.VH to be overridden from the command line Marc Zyngier
2021-01-23 14:04 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 14/21] arm64: Honor VHE being disabled from the command-line Marc Zyngier
2021-01-18 13:14 ` David Brazdil
2021-01-23 14:07 ` Catalin Marinas
2021-01-24 15:59 ` Marc Zyngier
2021-01-18 9:45 ` [PATCH v4 15/21] arm64: Add an aliasing facility for the idreg override Marc Zyngier
2021-01-18 13:18 ` David Brazdil
2021-01-24 19:01 ` Marc Zyngier
2021-01-23 14:12 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 16/21] arm64: Make kvm-arm.mode={nvhe,protected} an alias of id_aa64mmfr1.vh=0 Marc Zyngier
2021-01-23 14:15 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 17/21] KVM: arm64: Document HVC_VHE_RESTART stub hypercall Marc Zyngier
2021-01-18 13:29 ` David Brazdil [this message]
2021-01-18 9:45 ` [PATCH v4 18/21] arm64: Move "nokaslr" over to the early cpufeature infrastructure Marc Zyngier
2021-01-18 14:46 ` David Brazdil
2021-01-24 18:41 ` Marc Zyngier
2021-01-23 14:19 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 19/21] arm64: cpufeatures: Allow disabling of BTI from the command-line Marc Zyngier
2021-01-23 14:24 ` Catalin Marinas
2021-01-26 20:35 ` Srinivas Ramana
2021-01-18 9:45 ` [PATCH v4 20/21] arm64: Defer enabling pointer authentication on boot core Marc Zyngier
2021-01-23 14:26 ` Catalin Marinas
2021-01-18 9:45 ` [PATCH v4 21/21] arm64: cpufeatures: Allow disabling of Pointer Auth from the command-line Marc Zyngier
2021-01-23 14:28 ` Catalin Marinas
2021-01-26 20:30 ` Srinivas Ramana
2021-01-18 14:54 ` [PATCH v4 00/21] arm64: Early CPU feature override, and applications to VHE, BTI and PAuth David Brazdil
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