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authorPingfan Liu <kernelfans@gmail.com>2020-08-28 16:39:58 +0300
committerWill Deacon <will@kernel.org>2020-09-11 21:29:10 +0300
commit3a1793066fdfbbd657d9591cc03d6e1b6634a587 (patch)
treee61e8156dfd6ae88d3fb076567c98e6d22968061 /Documentation/virt
parent72789a4a6a914601912a8992b0d43bd5abc05128 (diff)
downloadlinux-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.rst6
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.