| Message ID | 1598621998-20563-2-git-send-email-kernelfans@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [PATCHv2,1/2] arm64/relocate_kernel: remove redundant code | expand |
On Fri, 28 Aug 2020 21:39:58 +0800, Pingfan Liu wrote: > Besides disabling MMU, HVC_SOFT_RESTART also clears I+D bits. These behaviors > are what kexec-reboot expects, so describe it more precisely. Applied to arm64 (for-next/boot), thanks! [1/1] Documentation/kvm/arm: improve description of HVC_SOFT_RESTART https://git.kernel.org/arm64/c/3a1793066fdf Cheers,
diff --git a/Documentation/virt/kvm/arm/hyp-abi.rst b/Documentation/virt/kvm/arm/hyp-abi.rst index d9eba93..83cadd8 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.
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 To: linux-arm-kernel@lists.infradead.org --- Documentation/virt/kvm/arm/hyp-abi.rst | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)