diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_builtin.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_builtin.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c index c42aa55b885f..ed2589d4593f 100644 --- a/arch/powerpc/kvm/book3s_hv_builtin.c +++ b/arch/powerpc/kvm/book3s_hv_builtin.c @@ -23,6 +23,8 @@ #include <asm/kvm_book3s.h> #include <asm/archrandom.h> #include <asm/xics.h> +#include <asm/dbell.h> +#include <asm/cputhreads.h> #define KVM_CMA_CHUNK_ORDER 18 @@ -193,7 +195,7 @@ static inline void rm_writeb(unsigned long paddr, u8 val) } /* - * Send an interrupt to another CPU. + * Send an interrupt or message to another CPU. * This can only be called in real mode. * The caller needs to include any barrier needed to order writes * to memory vs. the IPI/message. @@ -202,7 +204,17 @@ void kvmhv_rm_send_ipi(int cpu) { unsigned long xics_phys; - /* Poke the target */ + /* On POWER8 for IPIs to threads in the same core, use msgsnd */ + if (cpu_has_feature(CPU_FTR_ARCH_207S) && + cpu_first_thread_sibling(cpu) == + cpu_first_thread_sibling(raw_smp_processor_id())) { + unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER); + msg |= cpu_thread_in_core(cpu); + __asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg)); + return; + } + + /* Else poke the target with an IPI */ xics_phys = paca[cpu].kvm_hstate.xics_phys; rm_writeb(xics_phys + XICS_MFRR, IPI_PRIORITY); } |