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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 */

4
arch/powerpc/kernel/prom.c
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@ -55,6 +55,7 @@
#include <asm/firmware.h>
#include <asm/dt_cpu_ftrs.h>
#include <asm/drmem.h>
#include <asm/ultravisor.h>
#include <mm/mmu_decl.h>
@ -702,6 +703,9 @@ void __init early_init_devtree(void *params)
#ifdef CONFIG_PPC_POWERNV
/* Some machines might need OPAL info for debugging, grab it now. */
of_scan_flat_dt(early_init_dt_scan_opal, NULL);
/* Scan tree for ultravisor feature */
of_scan_flat_dt(early_init_dt_scan_ultravisor, NULL);
#endif
#ifdef CONFIG_FA_DUMP

1
arch/powerpc/platforms/powernv/Makefile
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@ -4,6 +4,7 @@ obj-y += idle.o opal-rtc.o opal-nvram.o opal-lpc.o opal-flash.o
obj-y += rng.o opal-elog.o opal-dump.o opal-sysparam.o opal-sensor.o
obj-y += opal-msglog.o opal-hmi.o opal-power.o opal-irqchip.o
obj-y += opal-kmsg.o opal-powercap.o opal-psr.o opal-sensor-groups.o
obj-y += ultravisor.o
obj-$(CONFIG_SMP) += smp.o subcore.o subcore-asm.o
obj-$(CONFIG_PCI) += pci.o pci-ioda.o npu-dma.o pci-ioda-tce.o

24
arch/powerpc/platforms/powernv/ultravisor.c Normal file
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@ -0,0 +1,24 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Ultravisor high level interfaces
*
* Copyright 2019, IBM Corporation.
*
*/
#include <linux/init.h>
#include <linux/printk.h>
#include <linux/of_fdt.h>
#include <asm/ultravisor.h>
#include <asm/firmware.h>
int __init early_init_dt_scan_ultravisor(unsigned long node, const char *uname,
int depth, void *data)
{
if (!of_flat_dt_is_compatible(node, "ibm,ultravisor"))
return 0;
powerpc_firmware_features |= FW_FEATURE_ULTRAVISOR;
pr_debug("Ultravisor detected!\n");
return 1;
}