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powerpc/powernv: Introduce FW_FEATURE_ULTRAVISOR

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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
This commit is contained in:
Claudio Carvalho
2019-08-22 00:48:34 -03:00
committed by Michael Ellerman
parent a49dddbdb0
commit bb04ffe85e
5 changed files with 46 additions and 2 deletions
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5
arch/powerpc/include/asm/firmware.h
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@@ -50,6 +50,7 @@
#define FW_FEATURE_DRC_INFO ASM_CONST(0x0000000800000000)
#define FW_FEATURE_BLOCK_REMOVE ASM_CONST(0x0000001000000000)
#define FW_FEATURE_PAPR_SCM ASM_CONST(0x0000002000000000)
#define FW_FEATURE_ULTRAVISOR ASM_CONST(0x0000004000000000)
#ifndef __ASSEMBLY__
@@ -68,9 +69,9 @@ enum {
FW_FEATURE_TYPE1_AFFINITY | FW_FEATURE_PRRN |
FW_FEATURE_HPT_RESIZE | FW_FEATURE_DRMEM_V2 |
FW_FEATURE_DRC_INFO | FW_FEATURE_BLOCK_REMOVE |
FW_FEATURE_PAPR_SCM,
FW_FEATURE_PAPR_SCM | FW_FEATURE_ULTRAVISOR,
FW_FEATURE_PSERIES_ALWAYS = 0,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL,
FW_FEATURE_POWERNV_POSSIBLE = FW_FEATURE_OPAL | FW_FEATURE_ULTRAVISOR,
FW_FEATURE_POWERNV_ALWAYS = 0,
FW_FEATURE_PS3_POSSIBLE = FW_FEATURE_LPAR | FW_FEATURE_PS3_LV1,
FW_FEATURE_PS3_ALWAYS = FW_FEATURE_LPAR | FW_FEATURE_PS3_LV1,

14
arch/powerpc/include/asm/ultravisor.h Normal file
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@@ -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 */