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    SubjectRe: [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@intel.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@intel.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



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