Re: [Xen-devel] [v4] libxc: Expose the 1GB pages cpuid flag to guest

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Nov 28, 2014 at 11:50:43AM +0000, Ian Campbell wrote:
> On Fri, 2014-11-28 at 18:52 +0800, Liang Li wrote:
> > If hardware support the 1GB pages, expose the feature to guest by
> > default. Users don't have to use a 'cpuid= ' option in config fil
> > e to turn it on.
> > 
> > If guest use shadow mode, the 1GB pages feature will be hidden from
> > guest, this is done in the function hvm_cpuid(). So the change is
> > okay for shadow mode case.
> > 
> > Signed-off-by: Liang Li <liang.z.li@xxxxxxxxx>
> > Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
> 
> FTR although this is strictly speaking a toolstack patch I think the
> main ack required should be from the x86 hypervisor guys...

Jan acked it.
> 
> > ---
> >  tools/libxc/xc_cpuid_x86.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
> > index a18b1ff..c97f91a 100644
> > --- a/tools/libxc/xc_cpuid_x86.c
> > +++ b/tools/libxc/xc_cpuid_x86.c
> > @@ -109,6 +109,7 @@ static void amd_xc_cpuid_policy(
> >          regs[3] &= (0x0183f3ff | /* features shared with 0x00000001:EDX */
> >                      bitmaskof(X86_FEATURE_NX) |
> >                      bitmaskof(X86_FEATURE_LM) |
> > +                    bitmaskof(X86_FEATURE_PAGE1GB) |
> >                      bitmaskof(X86_FEATURE_SYSCALL) |
> >                      bitmaskof(X86_FEATURE_MP) |
> >                      bitmaskof(X86_FEATURE_MMXEXT) |
> > @@ -192,6 +193,7 @@ static void intel_xc_cpuid_policy(
> >                      bitmaskof(X86_FEATURE_ABM));
> >          regs[3] &= (bitmaskof(X86_FEATURE_NX) |
> >                      bitmaskof(X86_FEATURE_LM) |
> > +                    bitmaskof(X86_FEATURE_PAGE1GB) |
> >                      bitmaskof(X86_FEATURE_SYSCALL) |
> >                      bitmaskof(X86_FEATURE_RDTSCP));
> >          break;
> > @@ -386,6 +388,7 @@ static void xc_cpuid_hvm_policy(
> >              clear_bit(X86_FEATURE_LM, regs[3]);
> >              clear_bit(X86_FEATURE_NX, regs[3]);
> >              clear_bit(X86_FEATURE_PSE36, regs[3]);
> > +            clear_bit(X86_FEATURE_PAGE1GB, regs[3]);
> >          }
> >          break;
> >  
> 
> 
> 
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