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SubjectRe: [PATCH 3/4] KVM: SVM: Add GHCB Accessor functions
On Wed, Jul 29, 2020 at 08:43:28AM -0700, Sean Christopherson wrote:
> Rather than manually calculate the byte/bit indices just use __set_bit()
> and test_bit(). That will also solve the variable declaration issue.
>
> E.g.
>
> #define GHB_BITMAP_IDX(field) \
> (offsetof(struct vmcb_save_area, (field)) / sizeof(u64))
>
> #define GHCB_SET_VALID(ghcb, field) \
> __set_bit(GHCB_BITMAP_IDX(field), (unsigned long *)&ghcb->save.valid_bitmap)
>
> Or alternatively drop GHCB_SET_VALID() and just open code the two users.

Thanks for your suggestions, I updated the patch and will do some
testing before re-posting.

Regards,

Joerg

>
> > + }
> > +
> > +#define DEFINE_GHCB_SETTER(field) \
> > + static inline void \
> > + ghcb_set_##field(struct ghcb *ghcb, u64 value) \
> > + { \
> > + GHCB_SET_VALID(ghcb, field) \
> > + (ghcb)->save.field = value; \
>
>
> The ghcb doesn't need to be wrapped in (), it's a parameter to a function.
> Same comment for the below usage.
>
> > + }
> > +
> > +#define DEFINE_GHCB_ACCESSORS(field) \
> > + static inline bool ghcb_is_valid_##field(const struct ghcb *ghcb) \
>
> I'd prefer to follow the naming of the arch reg accessors, i.e.
>
> static inline bool ghcb_##field##_is_valid(...)
>
> to pair with
>
> kvm_##lname##_read
> kvm_##lname##_write
>
> And because ghcb_is_valid_rip() reads a bit weird, e.g. IMO is more likely
> to be read as "does the RIP in the GHCB hold a valid (canonical) value",
> versus ghcb_rip_is_valid() reading as "is RIP valid in the GHCB".
>
> > + { \
> > + DEFINE_GHCB_INDICES(field) \
> > + return !!((ghcb)->save.valid_bitmap[byte_idx] \
> > + & BIT(bit_idx)); \
> > + } \
> > + \
> > + static inline void \
> > + ghcb_set_##field(struct ghcb *ghcb, u64 value) \
> > + { \
> > + GHCB_SET_VALID(ghcb, field) \
> > + (ghcb)->save.field = value; \
>
> > + }
> > +
> > +DEFINE_GHCB_ACCESSORS(cpl)
> > +DEFINE_GHCB_ACCESSORS(rip)
> > +DEFINE_GHCB_ACCESSORS(rsp)
> > +DEFINE_GHCB_ACCESSORS(rax)
> > +DEFINE_GHCB_ACCESSORS(rcx)
> > +DEFINE_GHCB_ACCESSORS(rdx)
> > +DEFINE_GHCB_ACCESSORS(rbx)
> > +DEFINE_GHCB_ACCESSORS(rbp)
> > +DEFINE_GHCB_ACCESSORS(rsi)
> > +DEFINE_GHCB_ACCESSORS(rdi)
> > +DEFINE_GHCB_ACCESSORS(r8)
> > +DEFINE_GHCB_ACCESSORS(r9)
> > +DEFINE_GHCB_ACCESSORS(r10)
> > +DEFINE_GHCB_ACCESSORS(r11)
> > +DEFINE_GHCB_ACCESSORS(r12)
> > +DEFINE_GHCB_ACCESSORS(r13)
> > +DEFINE_GHCB_ACCESSORS(r14)
> > +DEFINE_GHCB_ACCESSORS(r15)
> > +DEFINE_GHCB_ACCESSORS(sw_exit_code)
> > +DEFINE_GHCB_ACCESSORS(sw_exit_info_1)
> > +DEFINE_GHCB_ACCESSORS(sw_exit_info_2)
> > +DEFINE_GHCB_ACCESSORS(sw_scratch)
> > +DEFINE_GHCB_ACCESSORS(xcr0)
> > +
> > #endif
> > --
> > 2.17.1
> >

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