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| author |   Claudio Carvalho <cclaudio@linux.ibm.com> | 2019-08-22 00:48:34 -0300 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 09:40:15 +1000 |
| commit | bb04ffe85eebebd64d5e673a9434d968e80f3aa1 (patch) | |
| tree | f0375d18e4466a0af554ed7a62db72b7cd3c2226 /arch/powerpc/kernel/prom.c | |
| parent | powerpc/kernel: Add ucall_norets() ultravisor call handler (diff) | |
| download | linux-dev-bb04ffe85eebebd64d5e673a9434d968e80f3aa1.tar.xz linux-dev-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/kernel/prom.c')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 7159e791a70d..5828f1c81dc9 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -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 |