| Message ID | 1552984243-7689-4-git-send-email-amit.kachhap@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add ARMv8.3 pointer authentication for kvm guest | expand |
Hi Amit, On 19/03/2019 08:30, Amit Daniel Kachhap wrote: > Currently hyp_symbol_addr is palced in kvm_mmu.h which is mostly > used by __hyp_this_cpu_ptr in kvm_asm.h but it cannot include > kvm_mmu.h directly as kvm_mmu.h uses kvm_ksym_ref which is > defined inside kvm_asm.h. Hence, hyp_symbol_addr is moved inside > kvm_asm.h to fix this dependency on each other. > > Also kvm_ksym_ref is corresponding counterpart of hyp_symbol_addr > so should be ideally placed inside kvm_asm.h. > This part is a bit confusing, it lead me to think that kvm_ksym_ref was in kvm_mmu.h and should moved to kvm_asm.h as well. I'd suggest rephrasing it with something along the lines: "Also, hyp_symbol_addr corresponding counterpart, kvm_ksym_ref, is already in kvm_asm.h, making it more sensible to move kvm_symbol_addr to the same file." Otherwise: Reviewed-by: Julien Thierry <julien.thierry@arm.com> Cheers, Julien > Suggested by: James Morse <james.morse@arm.com> > Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> > Cc: Marc Zyngier <marc.zyngier@arm.com> > Cc: Christoffer Dall <christoffer.dall@arm.com> > Cc: kvmarm@lists.cs.columbia.edu > --- > arch/arm64/include/asm/kvm_asm.h | 20 ++++++++++++++++++++ > arch/arm64/include/asm/kvm_mmu.h | 20 -------------------- > 2 files changed, 20 insertions(+), 20 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h > index f5b79e9..57a07e8 100644 > --- a/arch/arm64/include/asm/kvm_asm.h > +++ b/arch/arm64/include/asm/kvm_asm.h > @@ -80,6 +80,26 @@ extern void __vgic_v3_init_lrs(void); > > extern u32 __kvm_get_mdcr_el2(void); > > +/* > + * Obtain the PC-relative address of a kernel symbol > + * s: symbol > + * > + * The goal of this macro is to return a symbol's address based on a > + * PC-relative computation, as opposed to a loading the VA from a > + * constant pool or something similar. This works well for HYP, as an > + * absolute VA is guaranteed to be wrong. Only use this if trying to > + * obtain the address of a symbol (i.e. not something you obtained by > + * following a pointer). > + */ > +#define hyp_symbol_addr(s) \ > + ({ \ > + typeof(s) *addr; \ > + asm("adrp %0, %1\n" \ > + "add %0, %0, :lo12:%1\n" \ > + : "=r" (addr) : "S" (&s)); \ > + addr; \ > + }) > + > /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */ > #define __hyp_this_cpu_ptr(sym) \ > ({ \ > diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h > index b0742a1..3dea6af 100644 > --- a/arch/arm64/include/asm/kvm_mmu.h > +++ b/arch/arm64/include/asm/kvm_mmu.h > @@ -118,26 +118,6 @@ static inline unsigned long __kern_hyp_va(unsigned long v) > #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v)))) > > /* > - * Obtain the PC-relative address of a kernel symbol > - * s: symbol > - * > - * The goal of this macro is to return a symbol's address based on a > - * PC-relative computation, as opposed to a loading the VA from a > - * constant pool or something similar. This works well for HYP, as an > - * absolute VA is guaranteed to be wrong. Only use this if trying to > - * obtain the address of a symbol (i.e. not something you obtained by > - * following a pointer). > - */ > -#define hyp_symbol_addr(s) \ > - ({ \ > - typeof(s) *addr; \ > - asm("adrp %0, %1\n" \ > - "add %0, %0, :lo12:%1\n" \ > - : "=r" (addr) : "S" (&s)); \ > - addr; \ > - }) > - > -/* > * We currently support using a VM-specified IPA size. For backward > * compatibility, the default IPA size is fixed to 40bits. > */ >
Hi Julien, On 3/20/19 2:19 PM, Julien Thierry wrote: > Hi Amit, > > On 19/03/2019 08:30, Amit Daniel Kachhap wrote: >> Currently hyp_symbol_addr is palced in kvm_mmu.h which is mostly >> used by __hyp_this_cpu_ptr in kvm_asm.h but it cannot include >> kvm_mmu.h directly as kvm_mmu.h uses kvm_ksym_ref which is >> defined inside kvm_asm.h. Hence, hyp_symbol_addr is moved inside >> kvm_asm.h to fix this dependency on each other. >> >> Also kvm_ksym_ref is corresponding counterpart of hyp_symbol_addr >> so should be ideally placed inside kvm_asm.h. >> > > This part is a bit confusing, it lead me to think that kvm_ksym_ref was > in kvm_mmu.h and should moved to kvm_asm.h as well. I'd suggest > rephrasing it with something along the lines: > > "Also, hyp_symbol_addr corresponding counterpart, kvm_ksym_ref, is > already in kvm_asm.h, making it more sensible to move kvm_symbol_addr to > the same file." ok, will rephrase. > > Otherwise: > > Reviewed-by: Julien Thierry <julien.thierry@arm.com> Thanks, Amit > > Cheers, > > Julien > >> Suggested by: James Morse <james.morse@arm.com> >> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> >> Cc: Marc Zyngier <marc.zyngier@arm.com> >> Cc: Christoffer Dall <christoffer.dall@arm.com> >> Cc: kvmarm@lists.cs.columbia.edu >> --- >> arch/arm64/include/asm/kvm_asm.h | 20 ++++++++++++++++++++ >> arch/arm64/include/asm/kvm_mmu.h | 20 -------------------- >> 2 files changed, 20 insertions(+), 20 deletions(-) >> >> diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h >> index f5b79e9..57a07e8 100644 >> --- a/arch/arm64/include/asm/kvm_asm.h >> +++ b/arch/arm64/include/asm/kvm_asm.h >> @@ -80,6 +80,26 @@ extern void __vgic_v3_init_lrs(void); >> >> extern u32 __kvm_get_mdcr_el2(void); >> >> +/* >> + * Obtain the PC-relative address of a kernel symbol >> + * s: symbol >> + * >> + * The goal of this macro is to return a symbol's address based on a >> + * PC-relative computation, as opposed to a loading the VA from a >> + * constant pool or something similar. This works well for HYP, as an >> + * absolute VA is guaranteed to be wrong. Only use this if trying to >> + * obtain the address of a symbol (i.e. not something you obtained by >> + * following a pointer). >> + */ >> +#define hyp_symbol_addr(s) \ >> + ({ \ >> + typeof(s) *addr; \ >> + asm("adrp %0, %1\n" \ >> + "add %0, %0, :lo12:%1\n" \ >> + : "=r" (addr) : "S" (&s)); \ >> + addr; \ >> + }) >> + >> /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */ >> #define __hyp_this_cpu_ptr(sym) \ >> ({ \ >> diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h >> index b0742a1..3dea6af 100644 >> --- a/arch/arm64/include/asm/kvm_mmu.h >> +++ b/arch/arm64/include/asm/kvm_mmu.h >> @@ -118,26 +118,6 @@ static inline unsigned long __kern_hyp_va(unsigned long v) >> #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v)))) >> >> /* >> - * Obtain the PC-relative address of a kernel symbol >> - * s: symbol >> - * >> - * The goal of this macro is to return a symbol's address based on a >> - * PC-relative computation, as opposed to a loading the VA from a >> - * constant pool or something similar. This works well for HYP, as an >> - * absolute VA is guaranteed to be wrong. Only use this if trying to >> - * obtain the address of a symbol (i.e. not something you obtained by >> - * following a pointer). >> - */ >> -#define hyp_symbol_addr(s) \ >> - ({ \ >> - typeof(s) *addr; \ >> - asm("adrp %0, %1\n" \ >> - "add %0, %0, :lo12:%1\n" \ >> - : "=r" (addr) : "S" (&s)); \ >> - addr; \ >> - }) >> - >> -/* >> * We currently support using a VM-specified IPA size. For backward >> * compatibility, the default IPA size is fixed to 40bits. >> */ >> >
diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index f5b79e9..57a07e8 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -80,6 +80,26 @@ extern void __vgic_v3_init_lrs(void); extern u32 __kvm_get_mdcr_el2(void); +/* + * Obtain the PC-relative address of a kernel symbol + * s: symbol + * + * The goal of this macro is to return a symbol's address based on a + * PC-relative computation, as opposed to a loading the VA from a + * constant pool or something similar. This works well for HYP, as an + * absolute VA is guaranteed to be wrong. Only use this if trying to + * obtain the address of a symbol (i.e. not something you obtained by + * following a pointer). + */ +#define hyp_symbol_addr(s) \ + ({ \ + typeof(s) *addr; \ + asm("adrp %0, %1\n" \ + "add %0, %0, :lo12:%1\n" \ + : "=r" (addr) : "S" (&s)); \ + addr; \ + }) + /* Home-grown __this_cpu_{ptr,read} variants that always work at HYP */ #define __hyp_this_cpu_ptr(sym) \ ({ \ diff --git a/arch/arm64/include/asm/kvm_mmu.h b/arch/arm64/include/asm/kvm_mmu.h index b0742a1..3dea6af 100644 --- a/arch/arm64/include/asm/kvm_mmu.h +++ b/arch/arm64/include/asm/kvm_mmu.h @@ -118,26 +118,6 @@ static inline unsigned long __kern_hyp_va(unsigned long v) #define kern_hyp_va(v) ((typeof(v))(__kern_hyp_va((unsigned long)(v)))) /* - * Obtain the PC-relative address of a kernel symbol - * s: symbol - * - * The goal of this macro is to return a symbol's address based on a - * PC-relative computation, as opposed to a loading the VA from a - * constant pool or something similar. This works well for HYP, as an - * absolute VA is guaranteed to be wrong. Only use this if trying to - * obtain the address of a symbol (i.e. not something you obtained by - * following a pointer). - */ -#define hyp_symbol_addr(s) \ - ({ \ - typeof(s) *addr; \ - asm("adrp %0, %1\n" \ - "add %0, %0, :lo12:%1\n" \ - : "=r" (addr) : "S" (&s)); \ - addr; \ - }) - -/* * We currently support using a VM-specified IPA size. For backward * compatibility, the default IPA size is fixed to 40bits. */
Currently hyp_symbol_addr is palced in kvm_mmu.h which is mostly used by __hyp_this_cpu_ptr in kvm_asm.h but it cannot include kvm_mmu.h directly as kvm_mmu.h uses kvm_ksym_ref which is defined inside kvm_asm.h. Hence, hyp_symbol_addr is moved inside kvm_asm.h to fix this dependency on each other. Also kvm_ksym_ref is corresponding counterpart of hyp_symbol_addr so should be ideally placed inside kvm_asm.h. Suggested by: James Morse <james.morse@arm.com> Signed-off-by: Amit Daniel Kachhap <amit.kachhap@arm.com> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Christoffer Dall <christoffer.dall@arm.com> Cc: kvmarm@lists.cs.columbia.edu --- arch/arm64/include/asm/kvm_asm.h | 20 ++++++++++++++++++++ arch/arm64/include/asm/kvm_mmu.h | 20 -------------------- 2 files changed, 20 insertions(+), 20 deletions(-)