diff options
| -rw-r--r-- | arch/ia64/include/asm/xen/interface.h | 1 | ||||
| -rw-r--r-- | arch/x86/include/asm/xen/interface.h | 1 | ||||
| -rw-r--r-- | arch/x86/xen/enlighten.c | 93 | ||||
| -rw-r--r-- | include/xen/interface/platform.h | 3 |
4 files changed, 96 insertions, 2 deletions
diff --git a/arch/ia64/include/asm/xen/interface.h b/arch/ia64/include/asm/xen/interface.h index fbb5198..09d5f7f 100644 --- a/arch/ia64/include/asm/xen/interface.h +++ b/arch/ia64/include/asm/xen/interface.h @@ -77,6 +77,7 @@ DEFINE_GUEST_HANDLE(int); DEFINE_GUEST_HANDLE(long); DEFINE_GUEST_HANDLE(void); DEFINE_GUEST_HANDLE(uint64_t); +DEFINE_GUEST_HANDLE(uint32_t); typedef unsigned long xen_pfn_t; DEFINE_GUEST_HANDLE(xen_pfn_t); diff --git a/arch/x86/include/asm/xen/interface.h b/arch/x86/include/asm/xen/interface.h index a1f2db5..cbf0c9d 100644 --- a/arch/x86/include/asm/xen/interface.h +++ b/arch/x86/include/asm/xen/interface.h @@ -56,6 +56,7 @@ DEFINE_GUEST_HANDLE(int); DEFINE_GUEST_HANDLE(long); DEFINE_GUEST_HANDLE(void); DEFINE_GUEST_HANDLE(uint64_t); +DEFINE_GUEST_HANDLE(uint32_t); #endif #ifndef HYPERVISOR_VIRT_START diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 312c9e3..fe06bf4 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -62,6 +62,15 @@ #include <asm/reboot.h> #include <asm/stackprotector.h> #include <asm/hypervisor.h> +#include <asm/mwait.h> + +#ifdef CONFIG_ACPI +#include <linux/acpi.h> +#include <asm/acpi.h> +#include <acpi/pdc_intel.h> +#include <acpi/processor.h> +#include <xen/interface/platform.h> +#endif #include "xen-ops.h" #include "mmu.h" @@ -200,13 +209,17 @@ static void __init xen_banner(void) static __read_mostly unsigned int cpuid_leaf1_edx_mask = ~0; static __read_mostly unsigned int cpuid_leaf1_ecx_mask = ~0; +static __read_mostly unsigned int cpuid_leaf1_ecx_set_mask; +static __read_mostly unsigned int cpuid_leaf5_ecx_val; +static __read_mostly unsigned int cpuid_leaf5_edx_val; + static void xen_cpuid(unsigned int *ax, unsigned int *bx, unsigned int *cx, unsigned int *dx) { unsigned maskebx = ~0; unsigned maskecx = ~0; unsigned maskedx = ~0; - + unsigned setecx = 0; /* * Mask out inconvenient features, to try and disable as many * unsupported kernel subsystems as possible. @@ -214,9 +227,18 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, switch (*ax) { case 1: maskecx = cpuid_leaf1_ecx_mask; + setecx = cpuid_leaf1_ecx_set_mask; maskedx = cpuid_leaf1_edx_mask; break; + case CPUID_MWAIT_LEAF: + /* Synthesize the values.. */ + *ax = 0; + *bx = 0; + *cx = cpuid_leaf5_ecx_val; + *dx = cpuid_leaf5_edx_val; + return; + case 0xb: /* Suppress extended topology stuff */ maskebx = 0; @@ -232,9 +254,75 @@ static void xen_cpuid(unsigned int *ax, unsigned int *bx, *bx &= maskebx; *cx &= maskecx; + *cx |= setecx; *dx &= maskedx; + } +static bool __init xen_check_mwait(void) +{ +#ifdef CONFIG_ACPI + struct xen_platform_op op = { + .cmd = XENPF_set_processor_pminfo, + .u.set_pminfo.id = -1, + .u.set_pminfo.type = XEN_PM_PDC, + }; + uint32_t buf[3]; + unsigned int ax, bx, cx, dx; + unsigned int mwait_mask; + + /* We need to determine whether it is OK to expose the MWAIT + * capability to the kernel to harvest deeper than C3 states from ACPI + * _CST using the processor_harvest_xen.c module. For this to work, we + * need to gather the MWAIT_LEAF values (which the cstate.c code + * checks against). The hypervisor won't expose the MWAIT flag because + * it would break backwards compatibility; so we will find out directly + * from the hardware and hypercall. + */ + if (!xen_initial_domain()) + return false; + + ax = 1; + cx = 0; + + native_cpuid(&ax, &bx, &cx, &dx); + + mwait_mask = (1 << (X86_FEATURE_EST % 32)) | + (1 << (X86_FEATURE_MWAIT % 32)); + + if ((cx & mwait_mask) != mwait_mask) + return false; + + /* We need to emulate the MWAIT_LEAF and for that we need both + * ecx and edx. The hypercall provides only partial information. + */ + + ax = CPUID_MWAIT_LEAF; + bx = 0; + cx = 0; + dx = 0; + + native_cpuid(&ax, &bx, &cx, &dx); + + /* Ask the Hypervisor whether to clear ACPI_PDC_C_C2C3_FFH. If so, + * don't expose MWAIT_LEAF and let ACPI pick the IOPORT version of C3. + */ + buf[0] = ACPI_PDC_REVISION_ID; + buf[1] = 1; + buf[2] = (ACPI_PDC_C_CAPABILITY_SMP | ACPI_PDC_EST_CAPABILITY_SWSMP); + + set_xen_guest_handle(op.u.set_pminfo.pdc, buf); + + if ((HYPERVISOR_dom0_op(&op) == 0) && + (buf[2] & (ACPI_PDC_C_C1_FFH | ACPI_PDC_C_C2C3_FFH))) { + cpuid_leaf5_ecx_val = cx; + cpuid_leaf5_edx_val = dx; + } + return true; +#else + return false; +#endif +} static void __init xen_init_cpuid_mask(void) { unsigned int ax, bx, cx, dx; @@ -261,6 +349,9 @@ static void __init xen_init_cpuid_mask(void) /* Xen will set CR4.OSXSAVE if supported and not disabled by force */ if ((cx & xsave_mask) != xsave_mask) cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */ + + if (xen_check_mwait()) + cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32)); } static void xen_set_debugreg(int reg, unsigned long val) diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h index c168468..861b359b 100644 --- a/include/xen/interface/platform.h +++ b/include/xen/interface/platform.h @@ -200,7 +200,7 @@ DEFINE_GUEST_HANDLE_STRUCT(xenpf_getidletime_t); #define XEN_PM_CX 0 #define XEN_PM_PX 1 #define XEN_PM_TX 2 - +#define XEN_PM_PDC 3 /* Px sub info type */ #define XEN_PX_PCT 1 #define XEN_PX_PSS 2 @@ -293,6 +293,7 @@ struct xenpf_set_processor_pminfo { union { struct xen_processor_power power;/* Cx: _CST/_CSD */ struct xen_processor_performance perf; /* Px: _PPC/_PCT/_PSS/_PSD */ + GUEST_HANDLE(uint32_t) pdc; }; }; DEFINE_GUEST_HANDLE_STRUCT(xenpf_set_processor_pminfo); |