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Documentation/kvm/arm: improve description of HVC_SOFT_RESTART

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Besides disabling MMU, HVC_SOFT_RESTART also clears I+D bits. These behaviors
are what kexec-reboot expects, so describe it more precisely.

Signed-off-by: Pingfan Liu <kernelfans@gmail.com>
Cc: James Morse <james.morse@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Julien Thierry <julien.thierry.kdev@gmail.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: linux-doc@vger.kernel.org
Cc: kvmarm@lists.cs.columbia.edu
Link: https://lore.kernel.org/r/1598621998-20563-2-git-send-email-kernelfans@gmail.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pingfan Liu 2020-08-28 21:39:58 +08:00 committed by Will Deacon
parent 72789a4a6a
commit 3a1793066f
1 changed files with 3 additions and 3 deletions
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6
Documentation/virt/kvm/arm/hyp-abi.rst
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@ -54,9 +54,9 @@ these functions (see arch/arm{,64}/include/asm/virt.h):
x3 = x1's value when entering the next payload (arm64)
x4 = x2's value when entering the next payload (arm64)
Mask all exceptions, disable the MMU, move the arguments into place
(arm64 only), and jump to the restart address while at HYP/EL2. This
hypercall is not expected to return to its caller.
Mask all exceptions, disable the MMU, clear I+D bits, move the arguments
into place (arm64 only), and jump to the restart address while at HYP/EL2.
This hypercall is not expected to return to its caller.
Any other value of r0/x0 triggers a hypervisor-specific handling,
which is not documented here.