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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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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