Re: [PATCH v2 27/29] LoongArch: KVM: Implement vcpu world switch

[Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>]

在 2023年02月21日 15:45, Paolo Bonzini 写道:
> On 2/20/23 07:57, Tianrui Zhao wrote:
> > +    /* Load Guest gprs */
> > +    ld.d    $r1,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 1)
> > +    ld.d    $r2,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 2)
> > +    ld.d    $r3,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 3)
> > +    ld.d    $r4,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 4)
> > +    ld.d    $r5,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 5)
> > +    ld.d    $r7,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 7)
> > +    ld.d    $r8,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 8)
> > +    ld.d    $r9,   \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 9)
> > +    ld.d    $r10,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 10)
> > +    ld.d    $r11,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 11)
> > +    ld.d    $r12,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 12)
> > +    ld.d    $r13,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 13)
> > +    ld.d    $r14,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 14)
> > +    ld.d    $r15,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 15)
> > +    ld.d    $r16,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 16)
> > +    ld.d    $r17,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 17)
> > +    ld.d    $r18,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 18)
> > +    ld.d    $r19,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 19)
> > +    ld.d    $r20,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 20)
> > +    ld.d    $r21,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 21)
> > +    ld.d    $r22,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 22)
> > +    ld.d    $r23,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 23)
> > +    ld.d    $r24,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 24)
> > +    ld.d    $r25,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 25)
> > +    ld.d    $r26,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 26)
> > +    ld.d    $r27,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 27)
> > +    ld.d    $r28,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 28)
> > +    ld.d    $r29,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 29)
> > +    ld.d    $r30,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 30)
> > +    ld.d    $r31,  \KVM_ARCH,  (KVM_ARCH_GGPR + 8 * 31)
> > +    /* Load KVM_ARCH register */
> > +    ld.d    \KVM_ARCH, \KVM_ARCH, (KVM_ARCH_GGPR + 8 * \GPRNUM)
>
> This in practice relies on KVM_ARCH being a2 so please remove the 
> KVM_ARCH and GPRNUM arguments from the macro; just replace \KVM_ARCH 
> with a2 as needed.
>
> Also, in these ld.d and st.d sequences you may want to use the ABI 
> names instead of the rNN names, so it's clearer that you are skipping 
> the KVM_ARCH register.
>
> Paolo

Thanks, I will use a2 to replace the KVM_ARCH and remove the GPRNUM 
argument.

Thanks
Tianrui Zhao