53af3ba2e8
If we allow LPCR[AIL] to be set for radix guests, then interrupts from the guest to the host can be delivered by the hardware with relocation on, and thus the code path starting at kvmppc_interrupt_hv can be executed in virtual mode (MMU on) for radix guests (previously it was only ever executed in real mode). Most of the code is indifferent to whether the MMU is on or off, but the calls to OPAL that use the real-mode OPAL entry code need to be switched to use the virtual-mode code instead. The affected calls are the calls to the OPAL XICS emulation functions in kvmppc_read_one_intr() and related functions. We test the MSR[IR] bit to detect whether we are in real or virtual mode, and call the opal_rm_* or opal_* function as appropriate. The other place that depends on the MMU being off is the optimization where the guest exit code jumps to the external interrupt vector or hypervisor doorbell interrupt vector, or returns to its caller (which is __kvmppc_vcore_entry). If the MMU is on and we are returning to the caller, then we don't need to use an rfid instruction since the MMU is already on; a simple blr suffices. If there is an external or hypervisor doorbell interrupt to handle, we branch to the relocation-on version of the interrupt vector. Signed-off-by: Paul Mackerras <paulus@ozlabs.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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| drivers | ||
| firmware | ||
| fs | ||
| include | ||
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| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
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| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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| Makefile | ||
| README | ||
README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.