* [PATCH 1/2] apic: Move hypervisor detection of x2apic to hypervisor.h @ 2010-12-08 6:03 ` Sheng Yang 0 siblings, 0 replies; 6+ messages in thread From: Sheng Yang @ 2010-12-08 6:03 UTC (permalink / raw) To: Jeremy Fitzhardinge Cc: Stefano Stabellini, konrad.wilk, xen-devel, linux-kernel, Sheng Yang Signed-off-by: Sheng Yang <sheng@linux.intel.com> --- arch/x86/include/asm/hypervisor.h | 9 +++++++++ arch/x86/kernel/apic/apic.c | 5 +++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h index ff2546c..0c6f7af 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -20,6 +20,8 @@ #ifndef _ASM_X86_HYPERVISOR_H #define _ASM_X86_HYPERVISOR_H +#include <asm/kvm_para.h> + extern void init_hypervisor(struct cpuinfo_x86 *c); extern void init_hypervisor_platform(void); @@ -47,4 +49,11 @@ extern const struct hypervisor_x86 x86_hyper_vmware; extern const struct hypervisor_x86 x86_hyper_ms_hyperv; extern const struct hypervisor_x86 x86_hyper_xen_hvm; +static inline bool hypervisor_x2apic_available(void) +{ + if (kvm_para_available()) + return true; + return false; +} + #endif diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 3f838d5..8408f2d 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -50,8 +50,8 @@ #include <asm/mtrr.h> #include <asm/smp.h> #include <asm/mce.h> -#include <asm/kvm_para.h> #include <asm/tsc.h> +#include <asm/hypervisor.h> unsigned int num_processors; @@ -1476,7 +1476,8 @@ void __init enable_IR_x2apic(void) /* IR is required if there is APIC ID > 255 even when running * under KVM */ - if (max_physical_apicid > 255 || !kvm_para_available()) + if (max_physical_apicid > 255 || + !hypervisor_x2apic_available()) goto nox2apic; /* * without IR all CPUs can be addressed by IOAPIC/MSI -- 1.7.0.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 1/2] apic: Move hypervisor detection of x2apic to hypervisor.h @ 2010-12-08 6:03 ` Sheng Yang 0 siblings, 0 replies; 6+ messages in thread From: Sheng Yang @ 2010-12-08 6:03 UTC (permalink / raw) To: Jeremy Fitzhardinge Cc: linux-kernel, konrad.wilk, xen-devel, Sheng Yang, Stefano Stabellini Signed-off-by: Sheng Yang <sheng@linux.intel.com> --- arch/x86/include/asm/hypervisor.h | 9 +++++++++ arch/x86/kernel/apic/apic.c | 5 +++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h index ff2546c..0c6f7af 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -20,6 +20,8 @@ #ifndef _ASM_X86_HYPERVISOR_H #define _ASM_X86_HYPERVISOR_H +#include <asm/kvm_para.h> + extern void init_hypervisor(struct cpuinfo_x86 *c); extern void init_hypervisor_platform(void); @@ -47,4 +49,11 @@ extern const struct hypervisor_x86 x86_hyper_vmware; extern const struct hypervisor_x86 x86_hyper_ms_hyperv; extern const struct hypervisor_x86 x86_hyper_xen_hvm; +static inline bool hypervisor_x2apic_available(void) +{ + if (kvm_para_available()) + return true; + return false; +} + #endif diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 3f838d5..8408f2d 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -50,8 +50,8 @@ #include <asm/mtrr.h> #include <asm/smp.h> #include <asm/mce.h> -#include <asm/kvm_para.h> #include <asm/tsc.h> +#include <asm/hypervisor.h> unsigned int num_processors; @@ -1476,7 +1476,8 @@ void __init enable_IR_x2apic(void) /* IR is required if there is APIC ID > 255 even when running * under KVM */ - if (max_physical_apicid > 255 || !kvm_para_available()) + if (max_physical_apicid > 255 || + !hypervisor_x2apic_available()) goto nox2apic; /* * without IR all CPUs can be addressed by IOAPIC/MSI -- 1.7.0.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH 2/2 v2] xen: HVM X2APIC support 2010-12-08 6:03 ` Sheng Yang (?) @ 2010-12-08 6:04 ` Sheng Yang 2010-12-17 8:20 ` Sheng Yang -1 siblings, 1 reply; 6+ messages in thread From: Sheng Yang @ 2010-12-08 6:04 UTC (permalink / raw) To: Jeremy Fitzhardinge Cc: Stefano Stabellini, konrad.wilk, xen-devel, linux-kernel, Sheng Yang This patch is similiar to Gleb Natapov's patch for KVM, which enable the hypervisor to emulate x2apic feature for the guest. By this way, the emulation of lapic would be simpler with x2apic interface(MSR), and faster. Signed-off-by: Sheng Yang <sheng@linux.intel.com> --- arch/x86/include/asm/hypervisor.h | 3 ++ arch/x86/include/asm/xen/hypervisor.h | 35 +++++++++++++++++++++++++++++++++ arch/x86/xen/enlighten.c | 30 ++++++++++----------------- 3 files changed, 49 insertions(+), 19 deletions(-) diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h index 0c6f7af..7a15153 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -21,6 +21,7 @@ #define _ASM_X86_HYPERVISOR_H #include <asm/kvm_para.h> +#include <asm/xen/hypervisor.h> extern void init_hypervisor(struct cpuinfo_x86 *c); extern void init_hypervisor_platform(void); @@ -53,6 +54,8 @@ static inline bool hypervisor_x2apic_available(void) { if (kvm_para_available()) return true; + if (xen_x2apic_para_available()) + return true; return false; } diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h index 396ff4c..66d0fff 100644 --- a/arch/x86/include/asm/xen/hypervisor.h +++ b/arch/x86/include/asm/xen/hypervisor.h @@ -37,4 +37,39 @@ extern struct shared_info *HYPERVISOR_shared_info; extern struct start_info *xen_start_info; +#include <asm/processor.h> + +static inline uint32_t xen_cpuid_base(void) +{ + uint32_t base, eax, ebx, ecx, edx; + char signature[13]; + + for (base = 0x40000000; base < 0x40010000; base += 0x100) { + cpuid(base, &eax, &ebx, &ecx, &edx); + *(uint32_t *)(signature + 0) = ebx; + *(uint32_t *)(signature + 4) = ecx; + *(uint32_t *)(signature + 8) = edx; + signature[12] = 0; + + if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) + return base; + } + + return 0; +} + +#ifdef CONFIG_XEN +extern bool xen_hvm_need_lapic(void); + +static inline bool xen_x2apic_para_available(void) +{ + return xen_hvm_need_lapic(); +} +#else +static inline bool xen_x2apic_para_available(void) +{ + return (xen_cpuid_base() != 0); +} +#endif + #endif /* _ASM_X86_XEN_HYPERVISOR_H */ diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 44dcad4..bb8aa31 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -1256,25 +1256,6 @@ asmlinkage void __init xen_start_kernel(void) #endif } -static uint32_t xen_cpuid_base(void) -{ - uint32_t base, eax, ebx, ecx, edx; - char signature[13]; - - for (base = 0x40000000; base < 0x40010000; base += 0x100) { - cpuid(base, &eax, &ebx, &ecx, &edx); - *(uint32_t *)(signature + 0) = ebx; - *(uint32_t *)(signature + 4) = ecx; - *(uint32_t *)(signature + 8) = edx; - signature[12] = 0; - - if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) - return base; - } - - return 0; -} - static int init_hvm_pv_info(int *major, int *minor) { uint32_t eax, ebx, ecx, edx, pages, msr, base; @@ -1384,6 +1365,17 @@ static bool __init xen_hvm_platform(void) return true; } +bool xen_hvm_need_lapic(void) +{ + if (xen_pv_domain()) + return false; + if (xen_hvm_domain() && xen_feature(XENFEAT_hvm_pirqs) && + xen_have_vector_callback) + return false; + return (xen_cpuid_base() != 0); +} +EXPORT_SYMBOL_GPL(xen_hvm_need_lapic); + const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = { .name = "Xen HVM", .detect = xen_hvm_platform, -- 1.7.0.1 ^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH 2/2 v2] xen: HVM X2APIC support 2010-12-08 6:04 ` [PATCH 2/2 v2] xen: HVM X2APIC support Sheng Yang @ 2010-12-17 8:20 ` Sheng Yang 2010-12-20 7:40 ` [Xen-devel] " Jeremy Fitzhardinge 0 siblings, 1 reply; 6+ messages in thread From: Sheng Yang @ 2010-12-17 8:20 UTC (permalink / raw) To: Jeremy Fitzhardinge Cc: Stefano Stabellini, konrad.wilk, xen-devel, linux-kernel On Wednesday 08 December 2010 14:04:00 Sheng Yang wrote: > This patch is similiar to Gleb Natapov's patch for KVM, which enable the > hypervisor to emulate x2apic feature for the guest. By this way, the > emulation of lapic would be simpler with x2apic interface(MSR), and > faster. > > Signed-off-by: Sheng Yang <sheng@linux.intel.com> Jeremy, any comments? Keir has already checked the hypervisor part in. -- regards Yang, Sheng > --- > arch/x86/include/asm/hypervisor.h | 3 ++ > arch/x86/include/asm/xen/hypervisor.h | 35 > +++++++++++++++++++++++++++++++++ arch/x86/xen/enlighten.c | > 30 ++++++++++----------------- 3 files changed, 49 insertions(+), 19 > deletions(-) > > diff --git a/arch/x86/include/asm/hypervisor.h > b/arch/x86/include/asm/hypervisor.h index 0c6f7af..7a15153 100644 > --- a/arch/x86/include/asm/hypervisor.h > +++ b/arch/x86/include/asm/hypervisor.h > @@ -21,6 +21,7 @@ > #define _ASM_X86_HYPERVISOR_H > > #include <asm/kvm_para.h> > +#include <asm/xen/hypervisor.h> > > extern void init_hypervisor(struct cpuinfo_x86 *c); > extern void init_hypervisor_platform(void); > @@ -53,6 +54,8 @@ static inline bool hypervisor_x2apic_available(void) > { > if (kvm_para_available()) > return true; > + if (xen_x2apic_para_available()) > + return true; > return false; > } > > diff --git a/arch/x86/include/asm/xen/hypervisor.h > b/arch/x86/include/asm/xen/hypervisor.h index 396ff4c..66d0fff 100644 > --- a/arch/x86/include/asm/xen/hypervisor.h > +++ b/arch/x86/include/asm/xen/hypervisor.h > @@ -37,4 +37,39 @@ > extern struct shared_info *HYPERVISOR_shared_info; > extern struct start_info *xen_start_info; > > +#include <asm/processor.h> > + > +static inline uint32_t xen_cpuid_base(void) > +{ > + uint32_t base, eax, ebx, ecx, edx; > + char signature[13]; > + > + for (base = 0x40000000; base < 0x40010000; base += 0x100) { > + cpuid(base, &eax, &ebx, &ecx, &edx); > + *(uint32_t *)(signature + 0) = ebx; > + *(uint32_t *)(signature + 4) = ecx; > + *(uint32_t *)(signature + 8) = edx; > + signature[12] = 0; > + > + if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) > + return base; > + } > + > + return 0; > +} > + > +#ifdef CONFIG_XEN > +extern bool xen_hvm_need_lapic(void); > + > +static inline bool xen_x2apic_para_available(void) > +{ > + return xen_hvm_need_lapic(); > +} > +#else > +static inline bool xen_x2apic_para_available(void) > +{ > + return (xen_cpuid_base() != 0); > +} > +#endif > + > #endif /* _ASM_X86_XEN_HYPERVISOR_H */ > diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c > index 44dcad4..bb8aa31 100644 > --- a/arch/x86/xen/enlighten.c > +++ b/arch/x86/xen/enlighten.c > @@ -1256,25 +1256,6 @@ asmlinkage void __init xen_start_kernel(void) > #endif > } > > -static uint32_t xen_cpuid_base(void) > -{ > - uint32_t base, eax, ebx, ecx, edx; > - char signature[13]; > - > - for (base = 0x40000000; base < 0x40010000; base += 0x100) { > - cpuid(base, &eax, &ebx, &ecx, &edx); > - *(uint32_t *)(signature + 0) = ebx; > - *(uint32_t *)(signature + 4) = ecx; > - *(uint32_t *)(signature + 8) = edx; > - signature[12] = 0; > - > - if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) > - return base; > - } > - > - return 0; > -} > - > static int init_hvm_pv_info(int *major, int *minor) > { > uint32_t eax, ebx, ecx, edx, pages, msr, base; > @@ -1384,6 +1365,17 @@ static bool __init xen_hvm_platform(void) > return true; > } > > +bool xen_hvm_need_lapic(void) > +{ > + if (xen_pv_domain()) > + return false; > + if (xen_hvm_domain() && xen_feature(XENFEAT_hvm_pirqs) && > + xen_have_vector_callback) > + return false; > + return (xen_cpuid_base() != 0); > +} > +EXPORT_SYMBOL_GPL(xen_hvm_need_lapic); > + > const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = { > .name = "Xen HVM", > .detect = xen_hvm_platform, ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Xen-devel] Re: [PATCH 2/2 v2] xen: HVM X2APIC support 2010-12-17 8:20 ` Sheng Yang @ 2010-12-20 7:40 ` Jeremy Fitzhardinge 0 siblings, 0 replies; 6+ messages in thread From: Jeremy Fitzhardinge @ 2010-12-20 7:40 UTC (permalink / raw) To: Sheng Yang; +Cc: linux-kernel, konrad.wilk, xen-devel, Stefano Stabellini On 12/17/2010 12:20 AM, Sheng Yang wrote: > On Wednesday 08 December 2010 14:04:00 Sheng Yang wrote: >> This patch is similiar to Gleb Natapov's patch for KVM, which enable the >> hypervisor to emulate x2apic feature for the guest. By this way, the >> emulation of lapic would be simpler with x2apic interface(MSR), and >> faster. >> >> Signed-off-by: Sheng Yang <sheng@linux.intel.com> > Jeremy, any comments? > > Keir has already checked the hypervisor part in. Yes, I suppose its OK. You can add Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> I think you should send it upstream via the x86 maintainers in tip.git. J > -- > regards > Yang, Sheng > >> --- >> arch/x86/include/asm/hypervisor.h | 3 ++ >> arch/x86/include/asm/xen/hypervisor.h | 35 >> +++++++++++++++++++++++++++++++++ arch/x86/xen/enlighten.c | >> 30 ++++++++++----------------- 3 files changed, 49 insertions(+), 19 >> deletions(-) >> >> diff --git a/arch/x86/include/asm/hypervisor.h >> b/arch/x86/include/asm/hypervisor.h index 0c6f7af..7a15153 100644 >> --- a/arch/x86/include/asm/hypervisor.h >> +++ b/arch/x86/include/asm/hypervisor.h >> @@ -21,6 +21,7 @@ >> #define _ASM_X86_HYPERVISOR_H >> >> #include <asm/kvm_para.h> >> +#include <asm/xen/hypervisor.h> >> >> extern void init_hypervisor(struct cpuinfo_x86 *c); >> extern void init_hypervisor_platform(void); >> @@ -53,6 +54,8 @@ static inline bool hypervisor_x2apic_available(void) >> { >> if (kvm_para_available()) >> return true; >> + if (xen_x2apic_para_available()) >> + return true; >> return false; >> } >> >> diff --git a/arch/x86/include/asm/xen/hypervisor.h >> b/arch/x86/include/asm/xen/hypervisor.h index 396ff4c..66d0fff 100644 >> --- a/arch/x86/include/asm/xen/hypervisor.h >> +++ b/arch/x86/include/asm/xen/hypervisor.h >> @@ -37,4 +37,39 @@ >> extern struct shared_info *HYPERVISOR_shared_info; >> extern struct start_info *xen_start_info; >> >> +#include <asm/processor.h> >> + >> +static inline uint32_t xen_cpuid_base(void) >> +{ >> + uint32_t base, eax, ebx, ecx, edx; >> + char signature[13]; >> + >> + for (base = 0x40000000; base < 0x40010000; base += 0x100) { >> + cpuid(base, &eax, &ebx, &ecx, &edx); >> + *(uint32_t *)(signature + 0) = ebx; >> + *(uint32_t *)(signature + 4) = ecx; >> + *(uint32_t *)(signature + 8) = edx; >> + signature[12] = 0; >> + >> + if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) >> + return base; >> + } >> + >> + return 0; >> +} >> + >> +#ifdef CONFIG_XEN >> +extern bool xen_hvm_need_lapic(void); >> + >> +static inline bool xen_x2apic_para_available(void) >> +{ >> + return xen_hvm_need_lapic(); >> +} >> +#else >> +static inline bool xen_x2apic_para_available(void) >> +{ >> + return (xen_cpuid_base() != 0); >> +} >> +#endif >> + >> #endif /* _ASM_X86_XEN_HYPERVISOR_H */ >> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c >> index 44dcad4..bb8aa31 100644 >> --- a/arch/x86/xen/enlighten.c >> +++ b/arch/x86/xen/enlighten.c >> @@ -1256,25 +1256,6 @@ asmlinkage void __init xen_start_kernel(void) >> #endif >> } >> >> -static uint32_t xen_cpuid_base(void) >> -{ >> - uint32_t base, eax, ebx, ecx, edx; >> - char signature[13]; >> - >> - for (base = 0x40000000; base < 0x40010000; base += 0x100) { >> - cpuid(base, &eax, &ebx, &ecx, &edx); >> - *(uint32_t *)(signature + 0) = ebx; >> - *(uint32_t *)(signature + 4) = ecx; >> - *(uint32_t *)(signature + 8) = edx; >> - signature[12] = 0; >> - >> - if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2)) >> - return base; >> - } >> - >> - return 0; >> -} >> - >> static int init_hvm_pv_info(int *major, int *minor) >> { >> uint32_t eax, ebx, ecx, edx, pages, msr, base; >> @@ -1384,6 +1365,17 @@ static bool __init xen_hvm_platform(void) >> return true; >> } >> >> +bool xen_hvm_need_lapic(void) >> +{ >> + if (xen_pv_domain()) >> + return false; >> + if (xen_hvm_domain() && xen_feature(XENFEAT_hvm_pirqs) && >> + xen_have_vector_callback) >> + return false; >> + return (xen_cpuid_base() != 0); >> +} >> +EXPORT_SYMBOL_GPL(xen_hvm_need_lapic); >> + >> const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = { >> .name = "Xen HVM", >> .detect = xen_hvm_platform, > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel > ^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH 1/2] apic: Move hypervisor detection of x2apic to hypervisor.h 2010-12-08 6:03 ` Sheng Yang (?) (?) @ 2010-12-14 7:49 ` Sheng Yang -1 siblings, 0 replies; 6+ messages in thread From: Sheng Yang @ 2010-12-14 7:49 UTC (permalink / raw) To: Jeremy Fitzhardinge Cc: Stefano Stabellini, konrad.wilk, xen-devel, linux-kernel On Wednesday 08 December 2010 14:03:59 Sheng Yang wrote: > Signed-off-by: Sheng Yang <sheng@linux.intel.com> > --- Jeremy? -- regards Yang, Sheng > arch/x86/include/asm/hypervisor.h | 9 +++++++++ > arch/x86/kernel/apic/apic.c | 5 +++-- > 2 files changed, 12 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/include/asm/hypervisor.h > b/arch/x86/include/asm/hypervisor.h index ff2546c..0c6f7af 100644 > --- a/arch/x86/include/asm/hypervisor.h > +++ b/arch/x86/include/asm/hypervisor.h > @@ -20,6 +20,8 @@ > #ifndef _ASM_X86_HYPERVISOR_H > #define _ASM_X86_HYPERVISOR_H > > +#include <asm/kvm_para.h> > + > extern void init_hypervisor(struct cpuinfo_x86 *c); > extern void init_hypervisor_platform(void); > > @@ -47,4 +49,11 @@ extern const struct hypervisor_x86 x86_hyper_vmware; > extern const struct hypervisor_x86 x86_hyper_ms_hyperv; > extern const struct hypervisor_x86 x86_hyper_xen_hvm; > > +static inline bool hypervisor_x2apic_available(void) > +{ > + if (kvm_para_available()) > + return true; > + return false; > +} > + > #endif > diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c > index 3f838d5..8408f2d 100644 > --- a/arch/x86/kernel/apic/apic.c > +++ b/arch/x86/kernel/apic/apic.c > @@ -50,8 +50,8 @@ > #include <asm/mtrr.h> > #include <asm/smp.h> > #include <asm/mce.h> > -#include <asm/kvm_para.h> > #include <asm/tsc.h> > +#include <asm/hypervisor.h> > > unsigned int num_processors; > > @@ -1476,7 +1476,8 @@ void __init enable_IR_x2apic(void) > /* IR is required if there is APIC ID > 255 even when running > * under KVM > */ > - if (max_physical_apicid > 255 || !kvm_para_available()) > + if (max_physical_apicid > 255 || > + !hypervisor_x2apic_available()) > goto nox2apic; > /* > * without IR all CPUs can be addressed by IOAPIC/MSI ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2010-12-20 7:40 UTC | newest] Thread overview: 6+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2010-12-08 6:03 [PATCH 1/2] apic: Move hypervisor detection of x2apic to hypervisor.h Sheng Yang 2010-12-08 6:03 ` Sheng Yang 2010-12-08 6:04 ` [PATCH 2/2 v2] xen: HVM X2APIC support Sheng Yang 2010-12-17 8:20 ` Sheng Yang 2010-12-20 7:40 ` [Xen-devel] " Jeremy Fitzhardinge 2010-12-14 7:49 ` [PATCH 1/2] apic: Move hypervisor detection of x2apic to hypervisor.h Sheng Yang
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