[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH V3 (resend) 07/19] xen/x86: Add support for the PMAP
From: Julien Grall <jgrall@xxxxxxxxxx> PMAP will be used in a follow-up patch to bootstrap map domain page infrastructure -- we need some way to map pages to setup the mapcache without a direct map. The functions pmap_{map, unmap} open code {set, clear}_fixmap to break the loop. Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx> Signed-off-by: Elias El Yandouzi <eliasely@xxxxxxxxxx> ---- The PMAP infrastructure was upstream separately for Arm since Hongyan sent the secret-free hypervisor series. So this is a new patch to plumb the feature on x86. Changes in v2: * Declare PMAP entries earlier in fixed_addresses * Reword the commit message diff --git a/xen/arch/x86/Kconfig b/xen/arch/x86/Kconfig index b4ec0e582e..56feb0c564 100644 --- a/xen/arch/x86/Kconfig +++ b/xen/arch/x86/Kconfig @@ -27,6 +27,7 @@ config X86 select HAS_PCI select HAS_PCI_MSI select HAS_PIRQ + select HAS_PMAP select HAS_SCHED_GRANULARITY select HAS_SECRET_HIDING select HAS_UBSAN diff --git a/xen/arch/x86/include/asm/fixmap.h b/xen/arch/x86/include/asm/fixmap.h index 516ec3fa6c..a7ac365fc6 100644 --- a/xen/arch/x86/include/asm/fixmap.h +++ b/xen/arch/x86/include/asm/fixmap.h @@ -21,6 +21,8 @@ #include <xen/acpi.h> #include <xen/pfn.h> +#include <xen/pmap.h> + #include <asm/apicdef.h> #include <asm/msi.h> #include <acpi/apei.h> @@ -53,6 +55,8 @@ enum fixed_addresses { FIX_PV_CONSOLE, FIX_XEN_SHARED_INFO, #endif /* CONFIG_XEN_GUEST */ + FIX_PMAP_BEGIN, + FIX_PMAP_END = FIX_PMAP_BEGIN + NUM_FIX_PMAP, /* Everything else should go further down. */ FIX_APIC_BASE, FIX_IO_APIC_BASE_0, diff --git a/xen/arch/x86/include/asm/pmap.h b/xen/arch/x86/include/asm/pmap.h new file mode 100644 index 0000000000..62746e191d --- /dev/null +++ b/xen/arch/x86/include/asm/pmap.h @@ -0,0 +1,25 @@ +#ifndef __ASM_PMAP_H__ +#define __ASM_PMAP_H__ + +#include <asm/fixmap.h> + +static inline void arch_pmap_map(unsigned int slot, mfn_t mfn) +{ + unsigned long linear = (unsigned long)fix_to_virt(slot); + l1_pgentry_t *pl1e = &l1_fixmap[l1_table_offset(linear)]; + + ASSERT(!(l1e_get_flags(*pl1e) & _PAGE_PRESENT)); + + l1e_write_atomic(pl1e, l1e_from_mfn(mfn, PAGE_HYPERVISOR)); +} + +static inline void arch_pmap_unmap(unsigned int slot) +{ + unsigned long linear = (unsigned long)fix_to_virt(slot); + l1_pgentry_t *pl1e = &l1_fixmap[l1_table_offset(linear)]; + + l1e_write_atomic(pl1e, l1e_empty()); + flush_tlb_one_local(linear); +} + +#endif /* __ASM_PMAP_H__ */ -- 2.40.1
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