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| author | Pingfan Liu <kernelfans@gmail.com> | 2020-08-28 16:39:58 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-09-11 21:29:10 +0300 |
| commit | 3a1793066fdfbbd657d9591cc03d6e1b6634a587 (patch) | |
| tree | e61e8156dfd6ae88d3fb076567c98e6d22968061 /Documentation/virt | |
| parent | 72789a4a6a914601912a8992b0d43bd5abc05128 (diff) | |
| download | linux-3a1793066fdfbbd657d9591cc03d6e1b6634a587.tar.xz | |
Documentation/kvm/arm: improve description of HVC_SOFT_RESTART
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>
Diffstat (limited to 'Documentation/virt')
| -rw-r--r-- | Documentation/virt/kvm/arm/hyp-abi.rst | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst index d9eba93aa364..83cadd8186fa 100644 --- a/Documentation/virt/kvm/arm/hyp-abi.rst +++ b/Documentation/virt/kvm/arm/hyp-abi.rst @@ -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. |