| Message ID | 20240819131924.372366-11-steven.price@arm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | arm64: Support for running as a guest in Arm CCA | expand |
On 19/08/2024 14:19, Steven Price wrote: > From: Suzuki K Poulose <suzuki.poulose@arm.com> > > Override the set_fixmap_io to set shared permission for the host > in case of a CC guest. For now we mark it shared unconditionally. > > If/when support for device assignment and device emulation in the realm > is added in the future then this will need to filter the physical > address and make the decision accordingly. > > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> > Signed-off-by: Steven Price <steven.price@arm.com> > --- > New patch for v5 > --- > arch/arm64/include/asm/fixmap.h | 2 ++ > arch/arm64/mm/mmu.c | 17 +++++++++++++++++ > 2 files changed, 19 insertions(+) > > diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h > index 87e307804b99..2c20da3a468c 100644 > --- a/arch/arm64/include/asm/fixmap.h > +++ b/arch/arm64/include/asm/fixmap.h > @@ -108,6 +108,8 @@ void __init early_fixmap_init(void); > #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) > > extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); > +#define set_fixmap_io set_fixmap_io > +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys); > > #include <asm-generic/fixmap.h> > > diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c > index 353ea5dc32b8..06b66c23c124 100644 > --- a/arch/arm64/mm/mmu.c > +++ b/arch/arm64/mm/mmu.c > @@ -1193,6 +1193,23 @@ void vmemmap_free(unsigned long start, unsigned long end, > } > #endif /* CONFIG_MEMORY_HOTPLUG */ > > +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys) > +{ > + pgprot_t prot = FIXMAP_PAGE_IO; > + > + /* > + * The set_fixmap_io maps a single Page covering phys. > + * To make better decision, we stick to the smallest page > + * size supported (4K). > + */ > + if (!arm64_is_iomem_private(phys, SZ_4K)) > + prot = pgprot_decrypted(prot); > + else > + prot = pgprot_encrypted(prot); With the ioremap_prot_hook introduction, this one looks like should use that, instead of open coding the same thing. Thoughts ? Suzuki
On 19/08/2024 15:13, Suzuki K Poulose wrote: > On 19/08/2024 14:19, Steven Price wrote: >> From: Suzuki K Poulose <suzuki.poulose@arm.com> >> >> Override the set_fixmap_io to set shared permission for the host >> in case of a CC guest. For now we mark it shared unconditionally. >> >> If/when support for device assignment and device emulation in the realm >> is added in the future then this will need to filter the physical >> address and make the decision accordingly. >> >> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> >> Signed-off-by: Steven Price <steven.price@arm.com> >> --- >> New patch for v5 >> --- >> arch/arm64/include/asm/fixmap.h | 2 ++ >> arch/arm64/mm/mmu.c | 17 +++++++++++++++++ >> 2 files changed, 19 insertions(+) >> >> diff --git a/arch/arm64/include/asm/fixmap.h >> b/arch/arm64/include/asm/fixmap.h >> index 87e307804b99..2c20da3a468c 100644 >> --- a/arch/arm64/include/asm/fixmap.h >> +++ b/arch/arm64/include/asm/fixmap.h >> @@ -108,6 +108,8 @@ void __init early_fixmap_init(void); >> #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, >> FIXMAP_PAGE_CLEAR) >> extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t >> phys, pgprot_t prot); >> +#define set_fixmap_io set_fixmap_io >> +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys); >> #include <asm-generic/fixmap.h> >> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c >> index 353ea5dc32b8..06b66c23c124 100644 >> --- a/arch/arm64/mm/mmu.c >> +++ b/arch/arm64/mm/mmu.c >> @@ -1193,6 +1193,23 @@ void vmemmap_free(unsigned long start, unsigned >> long end, >> } >> #endif /* CONFIG_MEMORY_HOTPLUG */ >> +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys) >> +{ >> + pgprot_t prot = FIXMAP_PAGE_IO; >> + >> + /* >> + * The set_fixmap_io maps a single Page covering phys. >> + * To make better decision, we stick to the smallest page >> + * size supported (4K). >> + */ >> + if (!arm64_is_iomem_private(phys, SZ_4K)) >> + prot = pgprot_decrypted(prot); >> + else >> + prot = pgprot_encrypted(prot); > > With the ioremap_prot_hook introduction, this one looks like should use > that, instead of open coding the same thing. Thoughts ? I can see the logic, but it's not quite that simple to implement. Either the ioremap_prot_hook needs moving out (and presumably) renaming to be a more generic "override device pgprot" mechanism, we it would be a horrid hack to put ioremap code in arch/arm64/mm/ioremap.c to handle this. Given that we're not even sure that the set_fixmap hack is a good idea, I'll leave this alone for now - the open coding is clear even if it's a duplicate. Thanks, Steve
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h index 87e307804b99..2c20da3a468c 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -108,6 +108,8 @@ void __init early_fixmap_init(void); #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); +#define set_fixmap_io set_fixmap_io +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys); #include <asm-generic/fixmap.h> diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 353ea5dc32b8..06b66c23c124 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -1193,6 +1193,23 @@ void vmemmap_free(unsigned long start, unsigned long end, } #endif /* CONFIG_MEMORY_HOTPLUG */ +void set_fixmap_io(enum fixed_addresses idx, phys_addr_t phys) +{ + pgprot_t prot = FIXMAP_PAGE_IO; + + /* + * The set_fixmap_io maps a single Page covering phys. + * To make better decision, we stick to the smallest page + * size supported (4K). + */ + if (!arm64_is_iomem_private(phys, SZ_4K)) + prot = pgprot_decrypted(prot); + else + prot = pgprot_encrypted(prot); + + __set_fixmap(idx, phys, prot); +} + int pud_set_huge(pud_t *pudp, phys_addr_t phys, pgprot_t prot) { pud_t new_pud = pfn_pud(__phys_to_pfn(phys), mk_pud_sect_prot(prot));