diff options
| author | Claudio Carvalho <cclaudio@linux.ibm.com> | 2019-08-22 00:48:36 -0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-08-30 09:40:16 +1000 |
| commit | 5223134029a87db925ecc9449f9501bad391a52e (patch) | |
| tree | 7dcd197f295a1ed6f08a824ed5144d91ca7f8f6b /arch/powerpc/include/asm/ultravisor.h | |
| parent | 139a1d2842ec181cf017502a46bb8d947682a960 (diff) | |
powerpc/mm: Write to PTCR only if ultravisor disabled
In ultravisor enabled systems, PTCR becomes ultravisor privileged only
for writing and an attempt to write to it will cause a Hypervisor
Emulation Assitance interrupt.
This patch uses the set_ptcr_when_no_uv() function to restrict PTCR
writing to only when ultravisor is disabled.
Signed-off-by: Claudio Carvalho <cclaudio@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190822034838.27876-6-cclaudio@linux.ibm.com
Diffstat (limited to 'arch/powerpc/include/asm/ultravisor.h')
| -rw-r--r-- | arch/powerpc/include/asm/ultravisor.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/ultravisor.h b/arch/powerpc/include/asm/ultravisor.h index 6fe1f365dec8..d7aa97aa7834 100644 --- a/arch/powerpc/include/asm/ultravisor.h +++ b/arch/powerpc/include/asm/ultravisor.h @@ -10,10 +10,22 @@ #include <asm/asm-prototypes.h> #include <asm/ultravisor-api.h> +#include <asm/firmware.h> int early_init_dt_scan_ultravisor(unsigned long node, const char *uname, int depth, void *data); +/* + * In ultravisor enabled systems, PTCR becomes ultravisor privileged only for + * writing and an attempt to write to it will cause a Hypervisor Emulation + * Assistance interrupt. + */ +static inline void set_ptcr_when_no_uv(u64 val) +{ + if (!firmware_has_feature(FW_FEATURE_ULTRAVISOR)) + mtspr(SPRN_PTCR, val); +} + static inline int uv_register_pate(u64 lpid, u64 dw0, u64 dw1) { return ucall_norets(UV_WRITE_PATE, lpid, dw0, dw1); |