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| author | Claudio Carvalho <cclaudio@linux.ibm.com> | 2019-08-22 05:48:34 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 01:40:15 +0200 |
| commit | bb04ffe85eebebd64d5e673a9434d968e80f3aa1 (patch) | |
| tree | f0375d18e4466a0af554ed7a62db72b7cd3c2226 /arch/powerpc/include/asm/ultravisor.h | |
| parent | powerpc/kernel: Add ucall_norets() ultravisor call handler (diff) | |
| download | linux-bb04ffe85eebebd64d5e673a9434d968e80f3aa1.tar.xz linux-bb04ffe85eebebd64d5e673a9434d968e80f3aa1.zip | |
powerpc/powernv: Introduce FW_FEATURE_ULTRAVISOR
In PEF enabled systems, some of the resources which were previously
hypervisor privileged are now ultravisor privileged and controlled by
the ultravisor firmware.
This adds FW_FEATURE_ULTRAVISOR to indicate if PEF is enabled.
The host kernel can use FW_FEATURE_ULTRAVISOR, for instance, to skip
accessing resources (e.g. PTCR and LDBAR) in case PEF is enabled.
Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
[ andmike: Device node name to "ibm,ultravisor" ]
Signed-off-by: Michael Anderson <andmike@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190822034838.27876-4-cclaudio@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include/asm/ultravisor.h')
| -rw-r--r-- | arch/powerpc/include/asm/ultravisor.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h new file mode 100644 index 000000000000..dc6e1ea198f2 --- /dev/null +++ b/arch/powerpc/include/asm/ultravisor.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Ultravisor definitions + * + * Copyright 2019, IBM Corporation. + * + */ +#ifndef _ASM_POWERPC_ULTRAVISOR_H +#define _ASM_POWERPC_ULTRAVISOR_H + +int early_init_dt_scan_ultravisor(unsigned long node, const char *uname, + int depth, void *data); + +#endif /* _ASM_POWERPC_ULTRAVISOR_H */ |