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freebsd-dev/sys/amd64/include/pmap.h
Konstantin Belousov 3ec7e1695c amd64 pmap: microoptimize local shootdowns for PCID PTI configurations 
When pmap operates in PTI mode, we must reload %cr3 on return to
userspace.  In non-PCID mode the reload always flushes all non-global
TLB entries and we take advantage of it by only invalidating the KPT
TLB entries (there is no cached UPT entries at all).

In PCID mode, we flush both KPT and UPT TLB explicitly, but we can
take advantage of the fact that PCID mode command to reload %cr3
includes a flag to flush/not flush target TLB.  In particular, we can
avoid the flush for UPT, instead record that load of pc_ucr3 into %cr3
on return to usermode should be flushing.  This is done by providing
either all-1s or ~CR3_PCID_MASK in pc_ucr3_load_mask.  The mask is
automatically reset to all-1s on return to usermode.

Similarly, we can avoid flushing UPT TLB on context switch, replacing
it by setting pc_ucr3_load_mask.  This unifies INVPCID and non-INVPCID
PTI ifunc, leaving only 4 cases instead of 6.  This trick is also
applicable both to the TLB shootdown IPI handlers, since handlers
interrupt the target thread.

But then we need to check pc_curpmap in handlers, and this would
reopen the same race for INVPCID machines as was fixed in r306350 for
non-INVPCID.  To not introduce the same bug, unconditionally do
spinlock_enter() in pmap_activate().

Reviewed by:	alc, markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	3 weeks
Differential revision:	https://reviews.freebsd.org/D25483
2020-07-18 18:19:57 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2003 Peter Wemm.
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Derived from hp300 version by Mike Hibler, this version by William
* Jolitz uses a recursive map [a pde points to the page directory] to
* map the page tables using the pagetables themselves. This is done to
* reduce the impact on kernel virtual memory for lots of sparse address
* space, and to reduce the cost of memory to each process.
*
* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
* $FreeBSD$
*/
#ifndef _MACHINE_PMAP_H_
#define _MACHINE_PMAP_H_
/*
* Page-directory and page-table entries follow this format, with a few
* of the fields not present here and there, depending on a lot of things.
*/
/* ---- Intel Nomenclature ---- */
#define X86_PG_V 0x001 /* P Valid */
#define X86_PG_RW 0x002 /* R/W Read/Write */
#define X86_PG_U 0x004 /* U/S User/Supervisor */
#define X86_PG_NC_PWT 0x008 /* PWT Write through */
#define X86_PG_NC_PCD 0x010 /* PCD Cache disable */
#define X86_PG_A 0x020 /* A Accessed */
#define X86_PG_M 0x040 /* D Dirty */
#define X86_PG_PS 0x080 /* PS Page size (0=4k,1=2M) */
#define X86_PG_PTE_PAT 0x080 /* PAT PAT index */
#define X86_PG_G 0x100 /* G Global */
#define X86_PG_AVAIL1 0x200 /* / Available for system */
#define X86_PG_AVAIL2 0x400 /* < programmers use */
#define X86_PG_AVAIL3 0x800 /* \ */
#define X86_PG_PDE_PAT 0x1000 /* PAT PAT index */
#define X86_PG_PKU(idx) ((pt_entry_t)idx << 59)
#define X86_PG_NX (1ul<<63) /* No-execute */
#define X86_PG_AVAIL(x) (1ul << (x))
/* Page level cache control fields used to determine the PAT type */
#define X86_PG_PDE_CACHE (X86_PG_PDE_PAT | X86_PG_NC_PWT | X86_PG_NC_PCD)
#define X86_PG_PTE_CACHE (X86_PG_PTE_PAT | X86_PG_NC_PWT | X86_PG_NC_PCD)
/* Protection keys indexes */
#define PMAP_MAX_PKRU_IDX 0xf
#define X86_PG_PKU_MASK X86_PG_PKU(PMAP_MAX_PKRU_IDX)
/*
* Intel extended page table (EPT) bit definitions.
*/
#define EPT_PG_READ 0x001 /* R Read */
#define EPT_PG_WRITE 0x002 /* W Write */
#define EPT_PG_EXECUTE 0x004 /* X Execute */
#define EPT_PG_IGNORE_PAT 0x040 /* IPAT Ignore PAT */
#define EPT_PG_PS 0x080 /* PS Page size */
#define EPT_PG_A 0x100 /* A Accessed */
#define EPT_PG_M 0x200 /* D Dirty */
#define EPT_PG_MEMORY_TYPE(x) ((x) << 3) /* MT Memory Type */
/*
* Define the PG_xx macros in terms of the bits on x86 PTEs.
*/
#define PG_V X86_PG_V
#define PG_RW X86_PG_RW
#define PG_U X86_PG_U
#define PG_NC_PWT X86_PG_NC_PWT
#define PG_NC_PCD X86_PG_NC_PCD
#define PG_A X86_PG_A
#define PG_M X86_PG_M
#define PG_PS X86_PG_PS
#define PG_PTE_PAT X86_PG_PTE_PAT
#define PG_G X86_PG_G
#define PG_AVAIL1 X86_PG_AVAIL1
#define PG_AVAIL2 X86_PG_AVAIL2
#define PG_AVAIL3 X86_PG_AVAIL3
#define PG_PDE_PAT X86_PG_PDE_PAT
#define PG_NX X86_PG_NX
#define PG_PDE_CACHE X86_PG_PDE_CACHE
#define PG_PTE_CACHE X86_PG_PTE_CACHE
/* Our various interpretations of the above */
#define PG_W X86_PG_AVAIL3 /* "Wired" pseudoflag */
#define PG_MANAGED X86_PG_AVAIL2
#define EPT_PG_EMUL_V X86_PG_AVAIL(52)
#define EPT_PG_EMUL_RW X86_PG_AVAIL(53)
#define PG_PROMOTED X86_PG_AVAIL(54) /* PDE only */
#define PG_FRAME (0x000ffffffffff000ul)
#define PG_PS_FRAME (0x000fffffffe00000ul)
#define PG_PS_PDP_FRAME (0x000fffffc0000000ul)
/*
* Promotion to a 2MB (PDE) page mapping requires that the corresponding 4KB
* (PTE) page mappings have identical settings for the following fields:
*/
#define PG_PTE_PROMOTE (PG_NX | PG_MANAGED | PG_W | PG_G | PG_PTE_CACHE | \
PG_M | PG_A | PG_U | PG_RW | PG_V | PG_PKU_MASK)
/*
* Page Protection Exception bits
*/
#define PGEX_P 0x01 /* Protection violation vs. not present */
#define PGEX_W 0x02 /* during a Write cycle */
#define PGEX_U 0x04 /* access from User mode (UPL) */
#define PGEX_RSV 0x08 /* reserved PTE field is non-zero */
#define PGEX_I 0x10 /* during an instruction fetch */
#define PGEX_PK 0x20 /* protection key violation */
#define PGEX_SGX 0x8000 /* SGX-related */
/*
* undef the PG_xx macros that define bits in the regular x86 PTEs that
* have a different position in nested PTEs. This is done when compiling
* code that needs to be aware of the differences between regular x86 and
* nested PTEs.
*
* The appropriate bitmask will be calculated at runtime based on the pmap
* type.
*/
#ifdef AMD64_NPT_AWARE
#undef PG_AVAIL1 /* X86_PG_AVAIL1 aliases with EPT_PG_M */
#undef PG_G
#undef PG_A
#undef PG_M
#undef PG_PDE_PAT
#undef PG_PDE_CACHE
#undef PG_PTE_PAT
#undef PG_PTE_CACHE
#undef PG_RW
#undef PG_V
#endif
/*
* Pte related macros. This is complicated by having to deal with
* the sign extension of the 48th bit.
*/
#define KVADDR(l4, l3, l2, l1) ( \
((unsigned long)-1 << 47) | \
((unsigned long)(l4) << PML4SHIFT) | \
((unsigned long)(l3) << PDPSHIFT) | \
((unsigned long)(l2) << PDRSHIFT) | \
((unsigned long)(l1) << PAGE_SHIFT))
#define UVADDR(l4, l3, l2, l1) ( \
((unsigned long)(l4) << PML4SHIFT) | \
((unsigned long)(l3) << PDPSHIFT) | \
((unsigned long)(l2) << PDRSHIFT) | \
((unsigned long)(l1) << PAGE_SHIFT))
/*
* Number of kernel PML4 slots. Can be anywhere from 1 to 64 or so,
* but setting it larger than NDMPML4E makes no sense.
*
* Each slot provides .5 TB of kernel virtual space.
*/
#define NKPML4E 4
#define NUPML4E (NPML4EPG/2) /* number of userland PML4 pages */
#define NUPDPE (NUPML4E*NPDPEPG)/* number of userland PDP pages */
#define NUPDE (NUPDPE*NPDEPG) /* number of userland PD entries */
/*
* NDMPML4E is the maximum number of PML4 entries that will be
* used to implement the direct map. It must be a power of two,
* and should generally exceed NKPML4E. The maximum possible
* value is 64; using 128 will make the direct map intrude into
* the recursive page table map.
*/
#define NDMPML4E 8
/*
* These values control the layout of virtual memory. The starting address
* of the direct map, which is controlled by DMPML4I, must be a multiple of
* its size. (See the PHYS_TO_DMAP() and DMAP_TO_PHYS() macros.)
*
* Note: KPML4I is the index of the (single) level 4 page that maps
* the KVA that holds KERNBASE, while KPML4BASE is the index of the
* first level 4 page that maps VM_MIN_KERNEL_ADDRESS. If NKPML4E
* is 1, these are the same, otherwise KPML4BASE < KPML4I and extra
* level 4 PDEs are needed to map from VM_MIN_KERNEL_ADDRESS up to
* KERNBASE.
*
* (KPML4I combines with KPDPI to choose where KERNBASE starts.
* Or, in other words, KPML4I provides bits 39..47 of KERNBASE,
* and KPDPI provides bits 30..38.)
*/
#define PML4PML4I (NPML4EPG/2) /* Index of recursive pml4 mapping */
#define KPML4BASE (NPML4EPG-NKPML4E) /* KVM at highest addresses */
#define DMPML4I rounddown(KPML4BASE-NDMPML4E, NDMPML4E) /* Below KVM */
#define KPML4I (NPML4EPG-1)
#define KPDPI (NPDPEPG-2) /* kernbase at -2GB */
/* Large map: index of the first and max last pml4 entry */
#define LMSPML4I (PML4PML4I + 1)
#define LMEPML4I (DMPML4I - 1)
/*
* XXX doesn't really belong here I guess...
*/
#define ISA_HOLE_START 0xa0000
#define ISA_HOLE_LENGTH (0x100000-ISA_HOLE_START)
#define PMAP_PCID_NONE 0xffffffff
#define PMAP_PCID_KERN 0
#define PMAP_PCID_OVERMAX 0x1000
#define PMAP_PCID_OVERMAX_KERN 0x800
#define PMAP_PCID_USER_PT 0x800
#define PMAP_NO_CR3 (~0UL)
#define PMAP_UCR3_NOMASK (~0UL)
#ifndef LOCORE
#include <sys/queue.h>
#include <sys/_cpuset.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <sys/_pctrie.h>
#include <sys/_rangeset.h>
#include <vm/_vm_radix.h>
typedef u_int64_t pd_entry_t;
typedef u_int64_t pt_entry_t;
typedef u_int64_t pdp_entry_t;
typedef u_int64_t pml4_entry_t;
/*
* Address of current address space page table maps and directories.
*/
#ifdef _KERNEL
#define addr_PTmap (KVADDR(PML4PML4I, 0, 0, 0))
#define addr_PDmap (KVADDR(PML4PML4I, PML4PML4I, 0, 0))
#define addr_PDPmap (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, 0))
#define addr_PML4map (KVADDR(PML4PML4I, PML4PML4I, PML4PML4I, PML4PML4I))
#define addr_PML4pml4e (addr_PML4map + (PML4PML4I * sizeof(pml4_entry_t)))
#define PTmap ((pt_entry_t *)(addr_PTmap))
#define PDmap ((pd_entry_t *)(addr_PDmap))
#define PDPmap ((pd_entry_t *)(addr_PDPmap))
#define PML4map ((pd_entry_t *)(addr_PML4map))
#define PML4pml4e ((pd_entry_t *)(addr_PML4pml4e))
extern int nkpt; /* Initial number of kernel page tables */
extern u_int64_t KPDPphys; /* physical address of kernel level 3 */
extern u_int64_t KPML4phys; /* physical address of kernel level 4 */
/*
* virtual address to page table entry and
* to physical address.
* Note: these work recursively, thus vtopte of a pte will give
* the corresponding pde that in turn maps it.
*/
pt_entry_t *vtopte(vm_offset_t);
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
#define pte_load_store(ptep, pte) atomic_swap_long(ptep, pte)
#define pte_load_clear(ptep) atomic_swap_long(ptep, 0)
#define pte_store(ptep, pte) do { \
*(u_long *)(ptep) = (u_long)(pte); \
} while (0)
#define pte_clear(ptep) pte_store(ptep, 0)
#define pde_store(pdep, pde) pte_store(pdep, pde)
extern pt_entry_t pg_nx;
#endif /* _KERNEL */
/*
* Pmap stuff
*/
struct pv_entry;
struct pv_chunk;
/*
* Locks
* (p) PV list lock
*/
struct md_page {
TAILQ_HEAD(, pv_entry) pv_list; /* (p) */
int pv_gen; /* (p) */
int pat_mode;
};
enum pmap_type {
PT_X86, /* regular x86 page tables */
PT_EPT, /* Intel's nested page tables */
PT_RVI, /* AMD's nested page tables */
};
struct pmap_pcids {
uint32_t pm_pcid;
uint32_t pm_gen;
};
/*
* The kernel virtual address (KVA) of the level 4 page table page is always
* within the direct map (DMAP) region.
*/
struct pmap {
struct mtx pm_mtx;
pml4_entry_t *pm_pml4; /* KVA of level 4 page table */
pml4_entry_t *pm_pml4u; /* KVA of user l4 page table */
uint64_t pm_cr3;
uint64_t pm_ucr3;
TAILQ_HEAD(,pv_chunk) pm_pvchunk; /* list of mappings in pmap */
cpuset_t pm_active; /* active on cpus */
enum pmap_type pm_type; /* regular or nested tables */
struct pmap_statistics pm_stats; /* pmap statistics */
struct vm_radix pm_root; /* spare page table pages */
long pm_eptgen; /* EPT pmap generation id */
int pm_flags;
struct pmap_pcids pm_pcids[MAXCPU];
struct rangeset pm_pkru;
};
/* flags */
#define PMAP_NESTED_IPIMASK 0xff
#define PMAP_PDE_SUPERPAGE (1 << 8) /* supports 2MB superpages */
#define PMAP_EMULATE_AD_BITS (1 << 9) /* needs A/D bits emulation */
#define PMAP_SUPPORTS_EXEC_ONLY (1 << 10) /* execute only mappings ok */
typedef struct pmap *pmap_t;
#ifdef _KERNEL
extern struct pmap kernel_pmap_store;
#define kernel_pmap (&kernel_pmap_store)
#define PMAP_LOCK(pmap) mtx_lock(&(pmap)->pm_mtx)
#define PMAP_LOCK_ASSERT(pmap, type) \
mtx_assert(&(pmap)->pm_mtx, (type))
#define PMAP_LOCK_DESTROY(pmap) mtx_destroy(&(pmap)->pm_mtx)
#define PMAP_LOCK_INIT(pmap) mtx_init(&(pmap)->pm_mtx, "pmap", \
NULL, MTX_DEF | MTX_DUPOK)
#define PMAP_LOCKED(pmap) mtx_owned(&(pmap)->pm_mtx)
#define PMAP_MTX(pmap) (&(pmap)->pm_mtx)
#define PMAP_TRYLOCK(pmap) mtx_trylock(&(pmap)->pm_mtx)
#define PMAP_UNLOCK(pmap) mtx_unlock(&(pmap)->pm_mtx)
int pmap_pinit_type(pmap_t pmap, enum pmap_type pm_type, int flags);
int pmap_emulate_accessed_dirty(pmap_t pmap, vm_offset_t va, int ftype);
#endif
/*
* For each vm_page_t, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry_t, the list is pv_list.
*/
typedef struct pv_entry {
vm_offset_t pv_va; /* virtual address for mapping */
TAILQ_ENTRY(pv_entry) pv_next;
} *pv_entry_t;
/*
* pv_entries are allocated in chunks per-process. This avoids the
* need to track per-pmap assignments.
*/
#define _NPCM 3
#define _NPCPV 168
#define PV_CHUNK_HEADER \
pmap_t pc_pmap; \
TAILQ_ENTRY(pv_chunk) pc_list; \
uint64_t pc_map[_NPCM]; /* bitmap; 1 = free */ \
TAILQ_ENTRY(pv_chunk) pc_lru;
struct pv_chunk_header {
PV_CHUNK_HEADER
};
struct pv_chunk {
PV_CHUNK_HEADER
struct pv_entry pc_pventry[_NPCPV];
};
#ifdef _KERNEL
extern caddr_t CADDR1;
extern pt_entry_t *CMAP1;
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
extern vm_paddr_t dmaplimit;
extern int pmap_pcid_enabled;
extern int invpcid_works;
#define pmap_page_get_memattr(m) ((vm_memattr_t)(m)->md.pat_mode)
#define pmap_page_is_write_mapped(m) (((m)->a.flags & PGA_WRITEABLE) != 0)
#define pmap_unmapbios(va, sz) pmap_unmapdev((va), (sz))
struct thread;
void pmap_activate_boot(pmap_t pmap);
void pmap_activate_sw(struct thread *);
void pmap_allow_2m_x_ept_recalculate(void);
void pmap_bootstrap(vm_paddr_t *);
int pmap_cache_bits(pmap_t pmap, int mode, boolean_t is_pde);
int pmap_change_attr(vm_offset_t, vm_size_t, int);
int pmap_change_prot(vm_offset_t, vm_size_t, vm_prot_t);
void pmap_demote_DMAP(vm_paddr_t base, vm_size_t len, boolean_t invalidate);
void pmap_flush_cache_range(vm_offset_t, vm_offset_t);
void pmap_flush_cache_phys_range(vm_paddr_t, vm_paddr_t, vm_memattr_t);
void pmap_init_pat(void);
void pmap_kenter(vm_offset_t va, vm_paddr_t pa);
void *pmap_kenter_temporary(vm_paddr_t pa, int i);
vm_paddr_t pmap_kextract(vm_offset_t);
void pmap_kremove(vm_offset_t);
int pmap_large_map(vm_paddr_t, vm_size_t, void **, vm_memattr_t);
void pmap_large_map_wb(void *sva, vm_size_t len);
void pmap_large_unmap(void *sva, vm_size_t len);
void *pmap_mapbios(vm_paddr_t, vm_size_t);
void *pmap_mapdev(vm_paddr_t, vm_size_t);
void *pmap_mapdev_attr(vm_paddr_t, vm_size_t, int);
void *pmap_mapdev_pciecfg(vm_paddr_t pa, vm_size_t size);
bool pmap_not_in_di(void);
boolean_t pmap_page_is_mapped(vm_page_t m);
void pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma);
void pmap_pinit_pml4(vm_page_t);
bool pmap_ps_enabled(pmap_t pmap);
void pmap_unmapdev(vm_offset_t, vm_size_t);
void pmap_invalidate_page(pmap_t, vm_offset_t);
void pmap_invalidate_range(pmap_t, vm_offset_t, vm_offset_t);
void pmap_invalidate_all(pmap_t);
void pmap_invalidate_cache(void);
void pmap_invalidate_cache_pages(vm_page_t *pages, int count);
void pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva);
void pmap_force_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva);
void pmap_get_mapping(pmap_t pmap, vm_offset_t va, uint64_t *ptr, int *num);
boolean_t pmap_map_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
void pmap_unmap_io_transient(vm_page_t *, vm_offset_t *, int, boolean_t);
void pmap_pti_add_kva(vm_offset_t sva, vm_offset_t eva, bool exec);
void pmap_pti_remove_kva(vm_offset_t sva, vm_offset_t eva);
void pmap_pti_pcid_invalidate(uint64_t ucr3, uint64_t kcr3);
void pmap_pti_pcid_invlpg(uint64_t ucr3, uint64_t kcr3, vm_offset_t va);
void pmap_pti_pcid_invlrng(uint64_t ucr3, uint64_t kcr3, vm_offset_t sva,
vm_offset_t eva);
int pmap_pkru_clear(pmap_t pmap, vm_offset_t sva, vm_offset_t eva);
int pmap_pkru_set(pmap_t pmap, vm_offset_t sva, vm_offset_t eva,
u_int keyidx, int flags);
void pmap_thread_init_invl_gen(struct thread *td);
int pmap_vmspace_copy(pmap_t dst_pmap, pmap_t src_pmap);
void pmap_page_array_startup(long count);
#endif /* _KERNEL */
/* Return various clipped indexes for a given VA */
static __inline vm_pindex_t
pmap_pte_index(vm_offset_t va)
{
return ((va >> PAGE_SHIFT) & ((1ul << NPTEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pde_index(vm_offset_t va)
{
return ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pdpe_index(vm_offset_t va)
{
return ((va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pml4e_index(vm_offset_t va)
{
return ((va >> PML4SHIFT) & ((1ul << NPML4EPGSHIFT) - 1));
}
#endif /* !LOCORE */
#endif /* !_MACHINE_PMAP_H_ */
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