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Date: Wed, 25 Jun 2008 13:38:05 +0300 From: Avi Kivity <avi@...ranet.com> To: "Yang, Sheng" <sheng.yang@...el.com> CC: kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu> Subject: Re: [PATCH 2/2] x86: Add "virt flag" in /proc/cpuinfo (copying Ingo) Yang, Sheng wrote: > From 54b1bb9fe5d2fe40fc047b43dd4e1a480d41a977 Mon Sep 17 00:00:00 2001 > From: Sheng Yang <sheng.yang@...el.com> > Date: Tue, 24 Jun 2008 17:03:17 +0800 > Subject: [PATCH] x86: Add "virt flag" in /proc/cpuinfo > > The hardware virtualization technology evolves very fast. But currently > it's hard to tell if your CPU support a certain kind of HW technology without > dig into the source code. > > The patch add a new item under /proc/cpuinfo, named "virt flag". The "virt > flag" got the similar function as "flag". It is used to indicate what > features does this CPU supported. It don't cover all features but only the > important ones. > > Ingo, do you prefer this as a separate 'virt flags' line or as addition to the 'flag' line? > Current implement just cover Intel VMX side. > > Signed-off-by: Sheng Yang <sheng.yang@...el.com> > --- > arch/x86/kernel/cpu/proc.c | 28 ++++++++++++++++++++++++++++ > include/asm-x86/cpufeature.h | 9 +++++++++ > 2 files changed, 37 insertions(+), 0 deletions(-) > > diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c > index 0d0d905..03b30d0 100644 > --- a/arch/x86/kernel/cpu/proc.c > +++ b/arch/x86/kernel/cpu/proc.c > @@ -77,6 +77,31 @@ static void show_cpuinfo_misc(struct seq_file *m, struct > cpuinfo_x86 *c) > } > #endif > > +static void show_cpuinfo_vmx_virtflag(struct seq_file *m) > +{ > + u32 vmx_msr_low, vmx_msr_high, msr_ctl, msr_ctl2; > + > + seq_printf(m, "\nvirt flag\t:"); > + rdmsr(MSR_IA32_VMX_PROCBASED_CTLS, vmx_msr_low, vmx_msr_high); > + msr_ctl = 0xffffffff & vmx_msr_high | vmx_msr_low; > + if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW) > + seq_printf(m, " tpr_shadow"); > + if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_VNMI) > + seq_printf(m, " vnmi"); > + if (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS) { > + rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2, > + vmx_msr_low, vmx_msr_high); > + msr_ctl2 = 0xffffffff & vmx_msr_high | vmx_msr_low; > + if ((msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC) && > + (msr_ctl & X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW)) > + seq_printf(m, " flexpriority"); > + if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_EPT) > + seq_printf(m, " ept"); > + if (msr_ctl2 & X86_VMX_FEATURE_PROC_CTLS2_VPID) > + seq_printf(m, " vpid"); > + } > +} > + > static int show_cpuinfo(struct seq_file *m, void *v) > { > struct cpuinfo_x86 *c = v; > @@ -123,6 +148,9 @@ static int show_cpuinfo(struct seq_file *m, void *v) > if (cpu_has(c, i) && x86_cap_flags[i] != NULL) > seq_printf(m, " %s", x86_cap_flags[i]); > > + if (cpu_has(c, X86_FEATURE_VMX)) > + show_cpuinfo_vmx_virtflag(m); > + > seq_printf(m, "\nbogomips\t: %lu.%02lu\n", > c->loops_per_jiffy/(500000/HZ), > (c->loops_per_jiffy/(5000/HZ)) % 100); > diff --git a/include/asm-x86/cpufeature.h b/include/asm-x86/cpufeature.h > index 0d609c8..87d8084 100644 > --- a/include/asm-x86/cpufeature.h > +++ b/include/asm-x86/cpufeature.h > @@ -84,6 +84,7 @@ > #define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */ > #define X86_FEATURE_MWAIT (4*32+ 3) /* Monitor/Mwait support */ > #define X86_FEATURE_DSCPL (4*32+ 4) /* CPL Qualified Debug Store */ > +#define X86_FEATURE_VMX (4*32+ 5) /* Virtual Machine eXtensions */ > #define X86_FEATURE_EST (4*32+ 7) /* Enhanced SpeedStep */ > #define X86_FEATURE_TM2 (4*32+ 8) /* Thermal Monitor 2 */ > #define X86_FEATURE_CID (4*32+10) /* Context ID */ > @@ -113,6 +114,14 @@ > */ > #define X86_FEATURE_IDA (7*32+ 0) /* Intel Dynamic Acceleration */ > > +/* Intel VMX MSR indicated features */ > +#define X86_VMX_FEATURE_PROC_CTLS_TPR_SHADOW 0x00200000 > +#define X86_VMX_FEATURE_PROC_CTLS_VNMI 0x00400000 > +#define X86_VMX_FEATURE_PROC_CTLS_2ND_CTLS 0x80000000 > +#define X86_VMX_FEATURE_PROC_CTLS2_VIRT_APIC 0x00000001 > +#define X86_VMX_FEATURE_PROC_CTLS2_EPT 0x00000002 > +#define X86_VMX_FEATURE_PROC_CTLS2_VPID 0x00000020 > + > #if defined(__KERNEL__) && !defined(__ASSEMBLY__) > > #include <linux/bitops.h> > -- > 1.5.5 > > -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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