diff options
Diffstat (limited to 'arch/powerpc/include/asm')
| -rw-r--r-- | arch/powerpc/include/asm/epapr_hcalls.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/epapr_hcalls.h b/arch/powerpc/include/asm/epapr_hcalls.h index f3b0c2cc9fea..976835d8f22e 100644 --- a/arch/powerpc/include/asm/epapr_hcalls.h +++ b/arch/powerpc/include/asm/epapr_hcalls.h @@ -134,10 +134,15 @@ * whether they will be clobbered. * * Note that r11 can be used as an output parameter. + * + * The "memory" clobber is only necessary for hcalls where the Hypervisor + * will read or write guest memory. However, we add it to all hcalls because + * the impact is minimal, and we want to ensure that it's present for the + * hcalls that need it. */ /* List of common clobbered registers. Do not use this macro. */ -#define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc" +#define EV_HCALL_CLOBBERS "r0", "r12", "xer", "ctr", "lr", "cc", "memory" #define EV_HCALL_CLOBBERS8 EV_HCALL_CLOBBERS #define EV_HCALL_CLOBBERS7 EV_HCALL_CLOBBERS8, "r10" |