[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v12 7/9] x86: enable QoS monitoring for each domain RMID
If the QoS monitoring service is attached to a domain, its related RMID will be set to hardware for monitoring when the domain's vcpu is scheduled in. When the domain's vcpu is scheduled out, RMID 0 (system reserved) will be set for monitoring. Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx> --- xen/arch/x86/domain.c | 5 +++++ xen/arch/x86/pqos.c | 26 ++++++++++++++++++++++++++ xen/include/asm-x86/msr-index.h | 3 +++ xen/include/asm-x86/pqos.h | 1 + 4 files changed, 35 insertions(+) diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c index f8e0e33..bb9a4d2 100644 --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1398,6 +1398,8 @@ static void __context_switch(void) { memcpy(&p->arch.user_regs, stack_regs, CTXT_SWITCH_STACK_BYTES); vcpu_save_fpu(p); + if ( pqos_monitor_enabled() && pqosm->rmid_inuse ) + pqos_monitor_assoc_rmid(0); p->arch.ctxt_switch_from(p); } @@ -1422,6 +1424,9 @@ static void __context_switch(void) } vcpu_restore_fpu_eager(n); n->arch.ctxt_switch_to(n); + + if ( pqos_monitor_enabled() && n->domain->arch.pqos_rmid > 0 ) + pqos_monitor_assoc_rmid(n->domain->arch.pqos_rmid); } gdt = !is_pv_32on64_vcpu(n) ? per_cpu(gdt_table, cpu) : diff --git a/xen/arch/x86/pqos.c b/xen/arch/x86/pqos.c index 18fd1f9..5b2ccbe 100644 --- a/xen/arch/x86/pqos.c +++ b/xen/arch/x86/pqos.c @@ -17,10 +17,16 @@ #include <xen/cpu.h> #include <asm/pqos.h> +struct pqr_assoc { + uint64_t val; + bool_t initialized; +}; + struct pqos_monitor *__read_mostly pqosm = NULL; static bool_t __initdata opt_pqos = 0; static bool_t __initdata opt_pqos_monitor = 0; static unsigned int __initdata opt_rmid_max = 255; +static DEFINE_PER_CPU(struct pqr_assoc, pqr_assoc); static void __init parse_pqos_param(char *s) { @@ -156,6 +162,26 @@ void pqos_monitor_free_rmid(struct domain *d) pqosm->rmid_inuse--; } +void pqos_monitor_assoc_rmid(unsigned int rmid) +{ + uint64_t val; + uint64_t new_val; + + if ( !this_cpu(pqr_assoc).initialized ) + { + rdmsrl(MSR_IA32_PQR_ASSOC, this_cpu(pqr_assoc).val); + this_cpu(pqr_assoc).initialized = 1; + } + val = this_cpu(pqr_assoc).val; + + new_val = (val & ~pqosm->rmid_mask) | (rmid & pqosm->rmid_mask); + if ( val != new_val ) + { + wrmsrl(MSR_IA32_PQR_ASSOC, new_val); + this_cpu(pqr_assoc).val = new_val; + } +} + /* * Local variables: * mode: C diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h index 70a8201..f894dfa 100644 --- a/xen/include/asm-x86/msr-index.h +++ b/xen/include/asm-x86/msr-index.h @@ -489,4 +489,7 @@ /* Geode defined MSRs */ #define MSR_GEODE_BUSCONT_CONF0 0x00001900 +/* Platform QoS MSRs */ +#define MSR_IA32_PQR_ASSOC 0x00000c8f + #endif /* __ASM_MSR_INDEX_H */ diff --git a/xen/include/asm-x86/pqos.h b/xen/include/asm-x86/pqos.h index 16aeb24..de5b808 100644 --- a/xen/include/asm-x86/pqos.h +++ b/xen/include/asm-x86/pqos.h @@ -50,6 +50,7 @@ static inline bool_t pqos_monitor_enabled(void) void __init init_platform_qos(void); int pqos_monitor_alloc_rmid(struct domain *d); void pqos_monitor_free_rmid(struct domain *d); +void pqos_monitor_assoc_rmid(unsigned int rmid); #endif /* __ASM_PQOS_H__ */ -- 1.7.9.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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