On Wed, Aug 04, 2021 at 05:52:13PM -0700, Kuppuswamy Sathyanarayanan wrote: > From: Andi Kleen <ak@xxxxxxxxxxxxxxx> > > This function is for declaring memory that should be shared with > a hypervisor in a confidential guest. If the architecture doesn't > implement it it's just ioremap. I would assume ioremap_shared() would "map" something, not "declare" it. > Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> > Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx> > --- > arch/alpha/include/asm/io.h | 1 + > arch/mips/include/asm/io.h | 1 + > arch/parisc/include/asm/io.h | 1 + > arch/sparc/include/asm/io_64.h | 1 + > include/asm-generic/io.h | 4 ++++ > 5 files changed, 8 insertions(+) > > diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h > index 0fab5ac90775..701b44909b94 100644 > --- a/arch/alpha/include/asm/io.h > +++ b/arch/alpha/include/asm/io.h > @@ -283,6 +283,7 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size) > } > > #define ioremap_wc ioremap > +#define ioremap_shared ioremap > #define ioremap_uc ioremap > > static inline void iounmap(volatile void __iomem *addr) > diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h > index 6f5c86d2bab4..3713ff624632 100644 > --- a/arch/mips/include/asm/io.h > +++ b/arch/mips/include/asm/io.h > @@ -179,6 +179,7 @@ void iounmap(const volatile void __iomem *addr); > #define ioremap(offset, size) \ > ioremap_prot((offset), (size), _CACHE_UNCACHED) > #define ioremap_uc ioremap > +#define ioremap_shared ioremap > > /* > * ioremap_cache - map bus memory into CPU space > diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h > index 0b5259102319..73064e152df7 100644 > --- a/arch/parisc/include/asm/io.h > +++ b/arch/parisc/include/asm/io.h > @@ -129,6 +129,7 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr) > */ > void __iomem *ioremap(unsigned long offset, unsigned long size); > #define ioremap_wc ioremap > +#define ioremap_shared ioremap > #define ioremap_uc ioremap > > extern void iounmap(const volatile void __iomem *addr); > diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h > index 5ffa820dcd4d..18cc656eb712 100644 > --- a/arch/sparc/include/asm/io_64.h > +++ b/arch/sparc/include/asm/io_64.h > @@ -409,6 +409,7 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size) > #define ioremap_uc(X,Y) ioremap((X),(Y)) > #define ioremap_wc(X,Y) ioremap((X),(Y)) > #define ioremap_wt(X,Y) ioremap((X),(Y)) > +#define ioremap_shared(X, Y) ioremap((X), (Y)) > static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size) > { > return NULL; > diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h > index e93375c710b9..bfcaee1691c8 100644 > --- a/include/asm-generic/io.h > +++ b/include/asm-generic/io.h > @@ -982,6 +982,10 @@ static inline void __iomem *ioremap(phys_addr_t addr, size_t size) > #define ioremap_wt ioremap > #endif > > +#ifndef ioremap_shared > +#define ioremap_shared ioremap > +#endif "ioremap_shared" is a very generic term for a pretty specific thing: "memory shared with a hypervisor in a confidential guest". Maybe deserves a comment with at least a hint here. "Hypervisors in a confidential guest" isn't the first thing that comes to mind when I read "shared". > /* > * ioremap_uc is special in that we do require an explicit architecture > * implementation. In general you do not want to use this function in a > -- > 2.25.1 >