On Mon, 20 Dec 2021 07:18:51 +0000,
Ganapatrao Kulkarni <gankulkarni@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
>
>
> On 30-11-2021 01:31 am, Marc Zyngier wrote:
> > From: Jintack Lim <jintack@xxxxxxxxxxxxxxx>
> >
> > Forward ELR_EL1, SPSR_EL1 and VBAR_EL1 traps to the virtual EL2 if the
> > virtual HCR_EL2.NV bit is set.
> >
> > This is for recursive nested virtualization.
> >
> > Signed-off-by: Jintack Lim <jintack@xxxxxxxxxxxxxxx>
> > Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
> > ---
> > arch/arm64/include/asm/kvm_arm.h | 1 +
> > arch/arm64/kvm/sys_regs.c | 28 +++++++++++++++++++++++++++-
> > 2 files changed, 28 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
> > index 9759bc893a51..68af5509e4b0 100644
> > --- a/arch/arm64/include/asm/kvm_arm.h
> > +++ b/arch/arm64/include/asm/kvm_arm.h
> > @@ -20,6 +20,7 @@
> > #define HCR_AMVOFFEN (UL(1) << 51)
> > #define HCR_FIEN (UL(1) << 47)
> > #define HCR_FWB (UL(1) << 46)
> > +#define HCR_NV1 (UL(1) << 43)
> > #define HCR_NV (UL(1) << 42)
> > #define HCR_API (UL(1) << 41)
> > #define HCR_APK (UL(1) << 40)
> > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> > index e96877fc3b2a..511e06b6f603 100644
> > --- a/arch/arm64/kvm/sys_regs.c
> > +++ b/arch/arm64/kvm/sys_regs.c
> > @@ -288,6 +288,22 @@ static bool access_rw(struct kvm_vcpu *vcpu,
> > return true;
> > }
> > +/* This function is to support the recursive nested
> > virtualization */
> > +static bool forward_nv1_traps(struct kvm_vcpu *vcpu, struct sys_reg_params *p)
> > +{
> > + return forward_traps(vcpu, HCR_NV1);
> > +}
> > +
>
> Shall we move this helper to emulate-nested.c?
Sure, that shouldn't be a problem.
M.
--
Without deviation from the norm, progress is not possible.
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