On Thu, 20 May 2021 14:32:17 +0100,
Zenghui Yu <[email protected]> wrote:
>
> On 2021/5/11 0:58, Marc Zyngier wrote:
> > From: Jintack Lim <[email protected]>
> >
> > Add a new ARM64_HAS_NESTED_VIRT feature to indicate that the
> > CPU has the ARMv8.3 nested virtualization capability.
> >
> > This will be used to support nested virtualization in KVM.
> >
> > Signed-off-by: Jintack Lim <[email protected]>
> > Signed-off-by: Andre Przywara <[email protected]>
> > Signed-off-by: Christoffer Dall <[email protected]>
> > Signed-off-by: Marc Zyngier <[email protected]>
> > ---
> > .../admin-guide/kernel-parameters.txt | 4 +++
> > arch/arm64/include/asm/cpucaps.h | 1 +
> > arch/arm64/kernel/cpufeature.c | 25 +++++++++++++++++++
> > 3 files changed, 30 insertions(+)
>
> [...]
>
> > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
> > index efed2830d141..056de86d7f6f 100644
> > --- a/arch/arm64/kernel/cpufeature.c
> > +++ b/arch/arm64/kernel/cpufeature.c
> > @@ -1645,6 +1645,21 @@ static void cpu_copy_el2regs(const struct
> > arm64_cpu_capabilities *__unused)
> > write_sysreg(read_sysreg(tpidr_el1), tpidr_el2);
> > }
> > +static bool nested_param;
> > +static bool has_nested_virt_support(const struct arm64_cpu_capabilities
> > *cap,
> > + int scope)
> > +{
> > + return has_cpuid_feature(cap, scope) &&
> > + nested_param;
> > +}
>
> Nitpick:
>
> How about putting them into a single line (they still perfectly
> fit within the 80-colume limit)?
Fair enough.
M.
--
Without deviation from the norm, progress is not possible.
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