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author | Claudio Carvalho <cclaudio@linux.ibm.com> | 2019-08-22 06:48:34 +0300 |
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committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 02:40:15 +0300 |
commit | bb04ffe85eebebd64d5e673a9434d968e80f3aa1 (patch) | |
tree | f0375d18e4466a0af554ed7a62db72b7cd3c2226 /arch/powerpc/platforms/powernv/ultravisor.c | |
parent | a49dddbdb0cca1d00fc9251e543a0aac09a6a65b (diff) | |
download | linux-bb04ffe85eebebd64d5e673a9434d968e80f3aa1.tar.xz |
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/platforms/powernv/ultravisor.c')
-rw-r--r-- | arch/powerpc/platforms/powernv/ultravisor.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/ultravisor.c b/arch/powerpc/platforms/powernv/ultravisor.c new file mode 100644 index 000000000000..02ac57b4bded --- /dev/null +++ b/arch/powerpc/platforms/powernv/ultravisor.c @@ -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; +} |