mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 18:39:59 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
- Get rid of private VM_FAULT flags - Add word-at-a-time implementation - Add DCACHE_WORD_ACCESS support - Cleanup control register handling - Disallow CPU hotplug of CPU 0 to simplify its handling complexity, following a similar restriction in x86 - Optimize pai crypto map allocation - Update the list of crypto express EP11 coprocessor operation modes - Fixes and improvements for secure guests AP pass-through - Several fixes to address incorrect page marking for address translation with the "cmma no-dat" feature, preventing potential incorrect guest TLB flushes - Fix early IPI handling - Several virtual vs physical address confusion fixes - Various small fixes and improvements all over the code -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEE3QHqV+H2a8xAv27vjYWKoQLXFBgFAmVFLkYACgkQjYWKoQLX FBgxRwf9FSNFwLcbYbG1x94rUUHnbaiyJWCezp3/ypr+m+qDvQatLYc75SxwrH0y ocSygqvtVryVkWAKKvOHF1Kg5R2Fedmzf5wuVTXglfPqE1ZgMGdwS/LtknIoz556 twZJIpFzUFt5xaljpTCZJanLMvy/npl0bilezhNGl6v7N5rsWLbfK6vsPMDm+TTZ yscapOsk8Z16NjXq0FETS5JHG65jjj9rkRfb0qD8SOFhti0fR9MSP2xeRXrDMDZE IWXog5usx2DS6VX2HnxA8O7z1hhuTccJ1K1+rYqbb0Fwccqi7QaGZXEvocYEvlvy lVe3/jbyn27hUoypHcfVCAVxdoOrnw== =SMOp -----END PGP SIGNATURE----- Merge tag 's390-6.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux Pull s390 updates from Vasily Gorbik: - Get rid of private VM_FAULT flags - Add word-at-a-time implementation - Add DCACHE_WORD_ACCESS support - Cleanup control register handling - Disallow CPU hotplug of CPU 0 to simplify its handling complexity, following a similar restriction in x86 - Optimize pai crypto map allocation - Update the list of crypto express EP11 coprocessor operation modes - Fixes and improvements for secure guests AP pass-through - Several fixes to address incorrect page marking for address translation with the "cmma no-dat" feature, preventing potential incorrect guest TLB flushes - Fix early IPI handling - Several virtual vs physical address confusion fixes - Various small fixes and improvements all over the code * tag 's390-6.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (74 commits) s390/cio: replace deprecated strncpy with strscpy s390/sclp: replace deprecated strncpy with strtomem s390/cio: fix virtual vs physical address confusion s390/cio: export CMG value as decimal s390: delete the unused store_prefix() function s390/cmma: fix handling of swapper_pg_dir and invalid_pg_dir s390/cmma: fix detection of DAT pages s390/sclp: handle default case in sclp memory notifier s390/pai_crypto: remove per-cpu variable assignement in event initialization s390/pai: initialize event count once at initialization s390/pai_crypto: use PERF_ATTACH_TASK define for per task detection s390/mm: add missing arch_set_page_dat() call to gmap allocations s390/mm: add missing arch_set_page_dat() call to vmem_crst_alloc() s390/cmma: fix initial kernel address space page table walk s390/diag: add missing virt_to_phys() translation to diag224() s390/mm,fault: move VM_FAULT_ERROR handling to do_exception() s390/mm,fault: remove VM_FAULT_BADMAP and VM_FAULT_BADACCESS s390/mm,fault: remove VM_FAULT_SIGNAL s390/mm,fault: remove VM_FAULT_BADCONTEXT s390/mm,fault: simplify kfence fault handling ...
1614 lines
43 KiB
C
1614 lines
43 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* guest access functions
|
|
*
|
|
* Copyright IBM Corp. 2014
|
|
*
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/mm_types.h>
|
|
#include <linux/err.h>
|
|
#include <linux/pgtable.h>
|
|
#include <linux/bitfield.h>
|
|
#include <asm/fault.h>
|
|
#include <asm/gmap.h>
|
|
#include "kvm-s390.h"
|
|
#include "gaccess.h"
|
|
#include <asm/switch_to.h>
|
|
|
|
union asce {
|
|
unsigned long val;
|
|
struct {
|
|
unsigned long origin : 52; /* Region- or Segment-Table Origin */
|
|
unsigned long : 2;
|
|
unsigned long g : 1; /* Subspace Group Control */
|
|
unsigned long p : 1; /* Private Space Control */
|
|
unsigned long s : 1; /* Storage-Alteration-Event Control */
|
|
unsigned long x : 1; /* Space-Switch-Event Control */
|
|
unsigned long r : 1; /* Real-Space Control */
|
|
unsigned long : 1;
|
|
unsigned long dt : 2; /* Designation-Type Control */
|
|
unsigned long tl : 2; /* Region- or Segment-Table Length */
|
|
};
|
|
};
|
|
|
|
enum {
|
|
ASCE_TYPE_SEGMENT = 0,
|
|
ASCE_TYPE_REGION3 = 1,
|
|
ASCE_TYPE_REGION2 = 2,
|
|
ASCE_TYPE_REGION1 = 3
|
|
};
|
|
|
|
union region1_table_entry {
|
|
unsigned long val;
|
|
struct {
|
|
unsigned long rto: 52;/* Region-Table Origin */
|
|
unsigned long : 2;
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long : 1;
|
|
unsigned long tf : 2; /* Region-Second-Table Offset */
|
|
unsigned long i : 1; /* Region-Invalid Bit */
|
|
unsigned long : 1;
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long tl : 2; /* Region-Second-Table Length */
|
|
};
|
|
};
|
|
|
|
union region2_table_entry {
|
|
unsigned long val;
|
|
struct {
|
|
unsigned long rto: 52;/* Region-Table Origin */
|
|
unsigned long : 2;
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long : 1;
|
|
unsigned long tf : 2; /* Region-Third-Table Offset */
|
|
unsigned long i : 1; /* Region-Invalid Bit */
|
|
unsigned long : 1;
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long tl : 2; /* Region-Third-Table Length */
|
|
};
|
|
};
|
|
|
|
struct region3_table_entry_fc0 {
|
|
unsigned long sto: 52;/* Segment-Table Origin */
|
|
unsigned long : 1;
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long : 1;
|
|
unsigned long tf : 2; /* Segment-Table Offset */
|
|
unsigned long i : 1; /* Region-Invalid Bit */
|
|
unsigned long cr : 1; /* Common-Region Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long tl : 2; /* Segment-Table Length */
|
|
};
|
|
|
|
struct region3_table_entry_fc1 {
|
|
unsigned long rfaa : 33; /* Region-Frame Absolute Address */
|
|
unsigned long : 14;
|
|
unsigned long av : 1; /* ACCF-Validity Control */
|
|
unsigned long acc: 4; /* Access-Control Bits */
|
|
unsigned long f : 1; /* Fetch-Protection Bit */
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long iep: 1; /* Instruction-Execution-Protection */
|
|
unsigned long : 2;
|
|
unsigned long i : 1; /* Region-Invalid Bit */
|
|
unsigned long cr : 1; /* Common-Region Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long : 2;
|
|
};
|
|
|
|
union region3_table_entry {
|
|
unsigned long val;
|
|
struct region3_table_entry_fc0 fc0;
|
|
struct region3_table_entry_fc1 fc1;
|
|
struct {
|
|
unsigned long : 53;
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long : 4;
|
|
unsigned long i : 1; /* Region-Invalid Bit */
|
|
unsigned long cr : 1; /* Common-Region Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long : 2;
|
|
};
|
|
};
|
|
|
|
struct segment_entry_fc0 {
|
|
unsigned long pto: 53;/* Page-Table Origin */
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long : 3;
|
|
unsigned long i : 1; /* Segment-Invalid Bit */
|
|
unsigned long cs : 1; /* Common-Segment Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long : 2;
|
|
};
|
|
|
|
struct segment_entry_fc1 {
|
|
unsigned long sfaa : 44; /* Segment-Frame Absolute Address */
|
|
unsigned long : 3;
|
|
unsigned long av : 1; /* ACCF-Validity Control */
|
|
unsigned long acc: 4; /* Access-Control Bits */
|
|
unsigned long f : 1; /* Fetch-Protection Bit */
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long iep: 1; /* Instruction-Execution-Protection */
|
|
unsigned long : 2;
|
|
unsigned long i : 1; /* Segment-Invalid Bit */
|
|
unsigned long cs : 1; /* Common-Segment Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long : 2;
|
|
};
|
|
|
|
union segment_table_entry {
|
|
unsigned long val;
|
|
struct segment_entry_fc0 fc0;
|
|
struct segment_entry_fc1 fc1;
|
|
struct {
|
|
unsigned long : 53;
|
|
unsigned long fc : 1; /* Format-Control */
|
|
unsigned long : 4;
|
|
unsigned long i : 1; /* Segment-Invalid Bit */
|
|
unsigned long cs : 1; /* Common-Segment Bit */
|
|
unsigned long tt : 2; /* Table-Type Bits */
|
|
unsigned long : 2;
|
|
};
|
|
};
|
|
|
|
enum {
|
|
TABLE_TYPE_SEGMENT = 0,
|
|
TABLE_TYPE_REGION3 = 1,
|
|
TABLE_TYPE_REGION2 = 2,
|
|
TABLE_TYPE_REGION1 = 3
|
|
};
|
|
|
|
union page_table_entry {
|
|
unsigned long val;
|
|
struct {
|
|
unsigned long pfra : 52; /* Page-Frame Real Address */
|
|
unsigned long z : 1; /* Zero Bit */
|
|
unsigned long i : 1; /* Page-Invalid Bit */
|
|
unsigned long p : 1; /* DAT-Protection Bit */
|
|
unsigned long iep: 1; /* Instruction-Execution-Protection */
|
|
unsigned long : 8;
|
|
};
|
|
};
|
|
|
|
/*
|
|
* vaddress union in order to easily decode a virtual address into its
|
|
* region first index, region second index etc. parts.
|
|
*/
|
|
union vaddress {
|
|
unsigned long addr;
|
|
struct {
|
|
unsigned long rfx : 11;
|
|
unsigned long rsx : 11;
|
|
unsigned long rtx : 11;
|
|
unsigned long sx : 11;
|
|
unsigned long px : 8;
|
|
unsigned long bx : 12;
|
|
};
|
|
struct {
|
|
unsigned long rfx01 : 2;
|
|
unsigned long : 9;
|
|
unsigned long rsx01 : 2;
|
|
unsigned long : 9;
|
|
unsigned long rtx01 : 2;
|
|
unsigned long : 9;
|
|
unsigned long sx01 : 2;
|
|
unsigned long : 29;
|
|
};
|
|
};
|
|
|
|
/*
|
|
* raddress union which will contain the result (real or absolute address)
|
|
* after a page table walk. The rfaa, sfaa and pfra members are used to
|
|
* simply assign them the value of a region, segment or page table entry.
|
|
*/
|
|
union raddress {
|
|
unsigned long addr;
|
|
unsigned long rfaa : 33; /* Region-Frame Absolute Address */
|
|
unsigned long sfaa : 44; /* Segment-Frame Absolute Address */
|
|
unsigned long pfra : 52; /* Page-Frame Real Address */
|
|
};
|
|
|
|
union alet {
|
|
u32 val;
|
|
struct {
|
|
u32 reserved : 7;
|
|
u32 p : 1;
|
|
u32 alesn : 8;
|
|
u32 alen : 16;
|
|
};
|
|
};
|
|
|
|
union ald {
|
|
u32 val;
|
|
struct {
|
|
u32 : 1;
|
|
u32 alo : 24;
|
|
u32 all : 7;
|
|
};
|
|
};
|
|
|
|
struct ale {
|
|
unsigned long i : 1; /* ALEN-Invalid Bit */
|
|
unsigned long : 5;
|
|
unsigned long fo : 1; /* Fetch-Only Bit */
|
|
unsigned long p : 1; /* Private Bit */
|
|
unsigned long alesn : 8; /* Access-List-Entry Sequence Number */
|
|
unsigned long aleax : 16; /* Access-List-Entry Authorization Index */
|
|
unsigned long : 32;
|
|
unsigned long : 1;
|
|
unsigned long asteo : 25; /* ASN-Second-Table-Entry Origin */
|
|
unsigned long : 6;
|
|
unsigned long astesn : 32; /* ASTE Sequence Number */
|
|
};
|
|
|
|
struct aste {
|
|
unsigned long i : 1; /* ASX-Invalid Bit */
|
|
unsigned long ato : 29; /* Authority-Table Origin */
|
|
unsigned long : 1;
|
|
unsigned long b : 1; /* Base-Space Bit */
|
|
unsigned long ax : 16; /* Authorization Index */
|
|
unsigned long atl : 12; /* Authority-Table Length */
|
|
unsigned long : 2;
|
|
unsigned long ca : 1; /* Controlled-ASN Bit */
|
|
unsigned long ra : 1; /* Reusable-ASN Bit */
|
|
unsigned long asce : 64; /* Address-Space-Control Element */
|
|
unsigned long ald : 32;
|
|
unsigned long astesn : 32;
|
|
/* .. more fields there */
|
|
};
|
|
|
|
int ipte_lock_held(struct kvm *kvm)
|
|
{
|
|
if (sclp.has_siif) {
|
|
int rc;
|
|
|
|
read_lock(&kvm->arch.sca_lock);
|
|
rc = kvm_s390_get_ipte_control(kvm)->kh != 0;
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
return rc;
|
|
}
|
|
return kvm->arch.ipte_lock_count != 0;
|
|
}
|
|
|
|
static void ipte_lock_simple(struct kvm *kvm)
|
|
{
|
|
union ipte_control old, new, *ic;
|
|
|
|
mutex_lock(&kvm->arch.ipte_mutex);
|
|
kvm->arch.ipte_lock_count++;
|
|
if (kvm->arch.ipte_lock_count > 1)
|
|
goto out;
|
|
retry:
|
|
read_lock(&kvm->arch.sca_lock);
|
|
ic = kvm_s390_get_ipte_control(kvm);
|
|
do {
|
|
old = READ_ONCE(*ic);
|
|
if (old.k) {
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
cond_resched();
|
|
goto retry;
|
|
}
|
|
new = old;
|
|
new.k = 1;
|
|
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
out:
|
|
mutex_unlock(&kvm->arch.ipte_mutex);
|
|
}
|
|
|
|
static void ipte_unlock_simple(struct kvm *kvm)
|
|
{
|
|
union ipte_control old, new, *ic;
|
|
|
|
mutex_lock(&kvm->arch.ipte_mutex);
|
|
kvm->arch.ipte_lock_count--;
|
|
if (kvm->arch.ipte_lock_count)
|
|
goto out;
|
|
read_lock(&kvm->arch.sca_lock);
|
|
ic = kvm_s390_get_ipte_control(kvm);
|
|
do {
|
|
old = READ_ONCE(*ic);
|
|
new = old;
|
|
new.k = 0;
|
|
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
wake_up(&kvm->arch.ipte_wq);
|
|
out:
|
|
mutex_unlock(&kvm->arch.ipte_mutex);
|
|
}
|
|
|
|
static void ipte_lock_siif(struct kvm *kvm)
|
|
{
|
|
union ipte_control old, new, *ic;
|
|
|
|
retry:
|
|
read_lock(&kvm->arch.sca_lock);
|
|
ic = kvm_s390_get_ipte_control(kvm);
|
|
do {
|
|
old = READ_ONCE(*ic);
|
|
if (old.kg) {
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
cond_resched();
|
|
goto retry;
|
|
}
|
|
new = old;
|
|
new.k = 1;
|
|
new.kh++;
|
|
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
}
|
|
|
|
static void ipte_unlock_siif(struct kvm *kvm)
|
|
{
|
|
union ipte_control old, new, *ic;
|
|
|
|
read_lock(&kvm->arch.sca_lock);
|
|
ic = kvm_s390_get_ipte_control(kvm);
|
|
do {
|
|
old = READ_ONCE(*ic);
|
|
new = old;
|
|
new.kh--;
|
|
if (!new.kh)
|
|
new.k = 0;
|
|
} while (cmpxchg(&ic->val, old.val, new.val) != old.val);
|
|
read_unlock(&kvm->arch.sca_lock);
|
|
if (!new.kh)
|
|
wake_up(&kvm->arch.ipte_wq);
|
|
}
|
|
|
|
void ipte_lock(struct kvm *kvm)
|
|
{
|
|
if (sclp.has_siif)
|
|
ipte_lock_siif(kvm);
|
|
else
|
|
ipte_lock_simple(kvm);
|
|
}
|
|
|
|
void ipte_unlock(struct kvm *kvm)
|
|
{
|
|
if (sclp.has_siif)
|
|
ipte_unlock_siif(kvm);
|
|
else
|
|
ipte_unlock_simple(kvm);
|
|
}
|
|
|
|
static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, u8 ar,
|
|
enum gacc_mode mode)
|
|
{
|
|
union alet alet;
|
|
struct ale ale;
|
|
struct aste aste;
|
|
unsigned long ald_addr, authority_table_addr;
|
|
union ald ald;
|
|
int eax, rc;
|
|
u8 authority_table;
|
|
|
|
if (ar >= NUM_ACRS)
|
|
return -EINVAL;
|
|
|
|
save_access_regs(vcpu->run->s.regs.acrs);
|
|
alet.val = vcpu->run->s.regs.acrs[ar];
|
|
|
|
if (ar == 0 || alet.val == 0) {
|
|
asce->val = vcpu->arch.sie_block->gcr[1];
|
|
return 0;
|
|
} else if (alet.val == 1) {
|
|
asce->val = vcpu->arch.sie_block->gcr[7];
|
|
return 0;
|
|
}
|
|
|
|
if (alet.reserved)
|
|
return PGM_ALET_SPECIFICATION;
|
|
|
|
if (alet.p)
|
|
ald_addr = vcpu->arch.sie_block->gcr[5];
|
|
else
|
|
ald_addr = vcpu->arch.sie_block->gcr[2];
|
|
ald_addr &= 0x7fffffc0;
|
|
|
|
rc = read_guest_real(vcpu, ald_addr + 16, &ald.val, sizeof(union ald));
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (alet.alen / 8 > ald.all)
|
|
return PGM_ALEN_TRANSLATION;
|
|
|
|
if (0x7fffffff - ald.alo * 128 < alet.alen * 16)
|
|
return PGM_ADDRESSING;
|
|
|
|
rc = read_guest_real(vcpu, ald.alo * 128 + alet.alen * 16, &ale,
|
|
sizeof(struct ale));
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (ale.i == 1)
|
|
return PGM_ALEN_TRANSLATION;
|
|
if (ale.alesn != alet.alesn)
|
|
return PGM_ALE_SEQUENCE;
|
|
|
|
rc = read_guest_real(vcpu, ale.asteo * 64, &aste, sizeof(struct aste));
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (aste.i)
|
|
return PGM_ASTE_VALIDITY;
|
|
if (aste.astesn != ale.astesn)
|
|
return PGM_ASTE_SEQUENCE;
|
|
|
|
if (ale.p == 1) {
|
|
eax = (vcpu->arch.sie_block->gcr[8] >> 16) & 0xffff;
|
|
if (ale.aleax != eax) {
|
|
if (eax / 16 > aste.atl)
|
|
return PGM_EXTENDED_AUTHORITY;
|
|
|
|
authority_table_addr = aste.ato * 4 + eax / 4;
|
|
|
|
rc = read_guest_real(vcpu, authority_table_addr,
|
|
&authority_table,
|
|
sizeof(u8));
|
|
if (rc)
|
|
return rc;
|
|
|
|
if ((authority_table & (0x40 >> ((eax & 3) * 2))) == 0)
|
|
return PGM_EXTENDED_AUTHORITY;
|
|
}
|
|
}
|
|
|
|
if (ale.fo == 1 && mode == GACC_STORE)
|
|
return PGM_PROTECTION;
|
|
|
|
asce->val = aste.asce;
|
|
return 0;
|
|
}
|
|
|
|
enum prot_type {
|
|
PROT_TYPE_LA = 0,
|
|
PROT_TYPE_KEYC = 1,
|
|
PROT_TYPE_ALC = 2,
|
|
PROT_TYPE_DAT = 3,
|
|
PROT_TYPE_IEP = 4,
|
|
/* Dummy value for passing an initialized value when code != PGM_PROTECTION */
|
|
PROT_NONE,
|
|
};
|
|
|
|
static int trans_exc_ending(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar,
|
|
enum gacc_mode mode, enum prot_type prot, bool terminate)
|
|
{
|
|
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
|
|
union teid *teid;
|
|
|
|
memset(pgm, 0, sizeof(*pgm));
|
|
pgm->code = code;
|
|
teid = (union teid *)&pgm->trans_exc_code;
|
|
|
|
switch (code) {
|
|
case PGM_PROTECTION:
|
|
switch (prot) {
|
|
case PROT_NONE:
|
|
/* We should never get here, acts like termination */
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
case PROT_TYPE_IEP:
|
|
teid->b61 = 1;
|
|
fallthrough;
|
|
case PROT_TYPE_LA:
|
|
teid->b56 = 1;
|
|
break;
|
|
case PROT_TYPE_KEYC:
|
|
teid->b60 = 1;
|
|
break;
|
|
case PROT_TYPE_ALC:
|
|
teid->b60 = 1;
|
|
fallthrough;
|
|
case PROT_TYPE_DAT:
|
|
teid->b61 = 1;
|
|
break;
|
|
}
|
|
if (terminate) {
|
|
teid->b56 = 0;
|
|
teid->b60 = 0;
|
|
teid->b61 = 0;
|
|
}
|
|
fallthrough;
|
|
case PGM_ASCE_TYPE:
|
|
case PGM_PAGE_TRANSLATION:
|
|
case PGM_REGION_FIRST_TRANS:
|
|
case PGM_REGION_SECOND_TRANS:
|
|
case PGM_REGION_THIRD_TRANS:
|
|
case PGM_SEGMENT_TRANSLATION:
|
|
/*
|
|
* op_access_id only applies to MOVE_PAGE -> set bit 61
|
|
* exc_access_id has to be set to 0 for some instructions. Both
|
|
* cases have to be handled by the caller.
|
|
*/
|
|
teid->addr = gva >> PAGE_SHIFT;
|
|
teid->fsi = mode == GACC_STORE ? TEID_FSI_STORE : TEID_FSI_FETCH;
|
|
teid->as = psw_bits(vcpu->arch.sie_block->gpsw).as;
|
|
fallthrough;
|
|
case PGM_ALEN_TRANSLATION:
|
|
case PGM_ALE_SEQUENCE:
|
|
case PGM_ASTE_VALIDITY:
|
|
case PGM_ASTE_SEQUENCE:
|
|
case PGM_EXTENDED_AUTHORITY:
|
|
/*
|
|
* We can always store exc_access_id, as it is
|
|
* undefined for non-ar cases. It is undefined for
|
|
* most DAT protection exceptions.
|
|
*/
|
|
pgm->exc_access_id = ar;
|
|
break;
|
|
}
|
|
return code;
|
|
}
|
|
|
|
static int trans_exc(struct kvm_vcpu *vcpu, int code, unsigned long gva, u8 ar,
|
|
enum gacc_mode mode, enum prot_type prot)
|
|
{
|
|
return trans_exc_ending(vcpu, code, gva, ar, mode, prot, false);
|
|
}
|
|
|
|
static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
|
|
unsigned long ga, u8 ar, enum gacc_mode mode)
|
|
{
|
|
int rc;
|
|
struct psw_bits psw = psw_bits(vcpu->arch.sie_block->gpsw);
|
|
|
|
if (!psw.dat) {
|
|
asce->val = 0;
|
|
asce->r = 1;
|
|
return 0;
|
|
}
|
|
|
|
if ((mode == GACC_IFETCH) && (psw.as != PSW_BITS_AS_HOME))
|
|
psw.as = PSW_BITS_AS_PRIMARY;
|
|
|
|
switch (psw.as) {
|
|
case PSW_BITS_AS_PRIMARY:
|
|
asce->val = vcpu->arch.sie_block->gcr[1];
|
|
return 0;
|
|
case PSW_BITS_AS_SECONDARY:
|
|
asce->val = vcpu->arch.sie_block->gcr[7];
|
|
return 0;
|
|
case PSW_BITS_AS_HOME:
|
|
asce->val = vcpu->arch.sie_block->gcr[13];
|
|
return 0;
|
|
case PSW_BITS_AS_ACCREG:
|
|
rc = ar_translation(vcpu, asce, ar, mode);
|
|
if (rc > 0)
|
|
return trans_exc(vcpu, rc, ga, ar, mode, PROT_TYPE_ALC);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val)
|
|
{
|
|
return kvm_read_guest(kvm, gpa, val, sizeof(*val));
|
|
}
|
|
|
|
/**
|
|
* guest_translate - translate a guest virtual into a guest absolute address
|
|
* @vcpu: virtual cpu
|
|
* @gva: guest virtual address
|
|
* @gpa: points to where guest physical (absolute) address should be stored
|
|
* @asce: effective asce
|
|
* @mode: indicates the access mode to be used
|
|
* @prot: returns the type for protection exceptions
|
|
*
|
|
* Translate a guest virtual address into a guest absolute address by means
|
|
* of dynamic address translation as specified by the architecture.
|
|
* If the resulting absolute address is not available in the configuration
|
|
* an addressing exception is indicated and @gpa will not be changed.
|
|
*
|
|
* Returns: - zero on success; @gpa contains the resulting absolute address
|
|
* - a negative value if guest access failed due to e.g. broken
|
|
* guest mapping
|
|
* - a positive value if an access exception happened. In this case
|
|
* the returned value is the program interruption code as defined
|
|
* by the architecture
|
|
*/
|
|
static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva,
|
|
unsigned long *gpa, const union asce asce,
|
|
enum gacc_mode mode, enum prot_type *prot)
|
|
{
|
|
union vaddress vaddr = {.addr = gva};
|
|
union raddress raddr = {.addr = gva};
|
|
union page_table_entry pte;
|
|
int dat_protection = 0;
|
|
int iep_protection = 0;
|
|
union ctlreg0 ctlreg0;
|
|
unsigned long ptr;
|
|
int edat1, edat2, iep;
|
|
|
|
ctlreg0.val = vcpu->arch.sie_block->gcr[0];
|
|
edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8);
|
|
edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78);
|
|
iep = ctlreg0.iep && test_kvm_facility(vcpu->kvm, 130);
|
|
if (asce.r)
|
|
goto real_address;
|
|
ptr = asce.origin * PAGE_SIZE;
|
|
switch (asce.dt) {
|
|
case ASCE_TYPE_REGION1:
|
|
if (vaddr.rfx01 > asce.tl)
|
|
return PGM_REGION_FIRST_TRANS;
|
|
ptr += vaddr.rfx * 8;
|
|
break;
|
|
case ASCE_TYPE_REGION2:
|
|
if (vaddr.rfx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.rsx01 > asce.tl)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
ptr += vaddr.rsx * 8;
|
|
break;
|
|
case ASCE_TYPE_REGION3:
|
|
if (vaddr.rfx || vaddr.rsx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.rtx01 > asce.tl)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
ptr += vaddr.rtx * 8;
|
|
break;
|
|
case ASCE_TYPE_SEGMENT:
|
|
if (vaddr.rfx || vaddr.rsx || vaddr.rtx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.sx01 > asce.tl)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
ptr += vaddr.sx * 8;
|
|
break;
|
|
}
|
|
switch (asce.dt) {
|
|
case ASCE_TYPE_REGION1: {
|
|
union region1_table_entry rfte;
|
|
|
|
if (kvm_is_error_gpa(vcpu->kvm, ptr))
|
|
return PGM_ADDRESSING;
|
|
if (deref_table(vcpu->kvm, ptr, &rfte.val))
|
|
return -EFAULT;
|
|
if (rfte.i)
|
|
return PGM_REGION_FIRST_TRANS;
|
|
if (rfte.tt != TABLE_TYPE_REGION1)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (vaddr.rsx01 < rfte.tf || vaddr.rsx01 > rfte.tl)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
if (edat1)
|
|
dat_protection |= rfte.p;
|
|
ptr = rfte.rto * PAGE_SIZE + vaddr.rsx * 8;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_REGION2: {
|
|
union region2_table_entry rste;
|
|
|
|
if (kvm_is_error_gpa(vcpu->kvm, ptr))
|
|
return PGM_ADDRESSING;
|
|
if (deref_table(vcpu->kvm, ptr, &rste.val))
|
|
return -EFAULT;
|
|
if (rste.i)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
if (rste.tt != TABLE_TYPE_REGION2)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (vaddr.rtx01 < rste.tf || vaddr.rtx01 > rste.tl)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
if (edat1)
|
|
dat_protection |= rste.p;
|
|
ptr = rste.rto * PAGE_SIZE + vaddr.rtx * 8;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_REGION3: {
|
|
union region3_table_entry rtte;
|
|
|
|
if (kvm_is_error_gpa(vcpu->kvm, ptr))
|
|
return PGM_ADDRESSING;
|
|
if (deref_table(vcpu->kvm, ptr, &rtte.val))
|
|
return -EFAULT;
|
|
if (rtte.i)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
if (rtte.tt != TABLE_TYPE_REGION3)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (rtte.cr && asce.p && edat2)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (rtte.fc && edat2) {
|
|
dat_protection |= rtte.fc1.p;
|
|
iep_protection = rtte.fc1.iep;
|
|
raddr.rfaa = rtte.fc1.rfaa;
|
|
goto absolute_address;
|
|
}
|
|
if (vaddr.sx01 < rtte.fc0.tf)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
if (vaddr.sx01 > rtte.fc0.tl)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
if (edat1)
|
|
dat_protection |= rtte.fc0.p;
|
|
ptr = rtte.fc0.sto * PAGE_SIZE + vaddr.sx * 8;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_SEGMENT: {
|
|
union segment_table_entry ste;
|
|
|
|
if (kvm_is_error_gpa(vcpu->kvm, ptr))
|
|
return PGM_ADDRESSING;
|
|
if (deref_table(vcpu->kvm, ptr, &ste.val))
|
|
return -EFAULT;
|
|
if (ste.i)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
if (ste.tt != TABLE_TYPE_SEGMENT)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (ste.cs && asce.p)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (ste.fc && edat1) {
|
|
dat_protection |= ste.fc1.p;
|
|
iep_protection = ste.fc1.iep;
|
|
raddr.sfaa = ste.fc1.sfaa;
|
|
goto absolute_address;
|
|
}
|
|
dat_protection |= ste.fc0.p;
|
|
ptr = ste.fc0.pto * (PAGE_SIZE / 2) + vaddr.px * 8;
|
|
}
|
|
}
|
|
if (kvm_is_error_gpa(vcpu->kvm, ptr))
|
|
return PGM_ADDRESSING;
|
|
if (deref_table(vcpu->kvm, ptr, &pte.val))
|
|
return -EFAULT;
|
|
if (pte.i)
|
|
return PGM_PAGE_TRANSLATION;
|
|
if (pte.z)
|
|
return PGM_TRANSLATION_SPEC;
|
|
dat_protection |= pte.p;
|
|
iep_protection = pte.iep;
|
|
raddr.pfra = pte.pfra;
|
|
real_address:
|
|
raddr.addr = kvm_s390_real_to_abs(vcpu, raddr.addr);
|
|
absolute_address:
|
|
if (mode == GACC_STORE && dat_protection) {
|
|
*prot = PROT_TYPE_DAT;
|
|
return PGM_PROTECTION;
|
|
}
|
|
if (mode == GACC_IFETCH && iep_protection && iep) {
|
|
*prot = PROT_TYPE_IEP;
|
|
return PGM_PROTECTION;
|
|
}
|
|
if (kvm_is_error_gpa(vcpu->kvm, raddr.addr))
|
|
return PGM_ADDRESSING;
|
|
*gpa = raddr.addr;
|
|
return 0;
|
|
}
|
|
|
|
static inline int is_low_address(unsigned long ga)
|
|
{
|
|
/* Check for address ranges 0..511 and 4096..4607 */
|
|
return (ga & ~0x11fful) == 0;
|
|
}
|
|
|
|
static int low_address_protection_enabled(struct kvm_vcpu *vcpu,
|
|
const union asce asce)
|
|
{
|
|
union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]};
|
|
psw_t *psw = &vcpu->arch.sie_block->gpsw;
|
|
|
|
if (!ctlreg0.lap)
|
|
return 0;
|
|
if (psw_bits(*psw).dat && asce.p)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int vm_check_access_key(struct kvm *kvm, u8 access_key,
|
|
enum gacc_mode mode, gpa_t gpa)
|
|
{
|
|
u8 storage_key, access_control;
|
|
bool fetch_protected;
|
|
unsigned long hva;
|
|
int r;
|
|
|
|
if (access_key == 0)
|
|
return 0;
|
|
|
|
hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
|
|
if (kvm_is_error_hva(hva))
|
|
return PGM_ADDRESSING;
|
|
|
|
mmap_read_lock(current->mm);
|
|
r = get_guest_storage_key(current->mm, hva, &storage_key);
|
|
mmap_read_unlock(current->mm);
|
|
if (r)
|
|
return r;
|
|
access_control = FIELD_GET(_PAGE_ACC_BITS, storage_key);
|
|
if (access_control == access_key)
|
|
return 0;
|
|
fetch_protected = storage_key & _PAGE_FP_BIT;
|
|
if ((mode == GACC_FETCH || mode == GACC_IFETCH) && !fetch_protected)
|
|
return 0;
|
|
return PGM_PROTECTION;
|
|
}
|
|
|
|
static bool fetch_prot_override_applicable(struct kvm_vcpu *vcpu, enum gacc_mode mode,
|
|
union asce asce)
|
|
{
|
|
psw_t *psw = &vcpu->arch.sie_block->gpsw;
|
|
unsigned long override;
|
|
|
|
if (mode == GACC_FETCH || mode == GACC_IFETCH) {
|
|
/* check if fetch protection override enabled */
|
|
override = vcpu->arch.sie_block->gcr[0];
|
|
override &= CR0_FETCH_PROTECTION_OVERRIDE;
|
|
/* not applicable if subject to DAT && private space */
|
|
override = override && !(psw_bits(*psw).dat && asce.p);
|
|
return override;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool fetch_prot_override_applies(unsigned long ga, unsigned int len)
|
|
{
|
|
return ga < 2048 && ga + len <= 2048;
|
|
}
|
|
|
|
static bool storage_prot_override_applicable(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* check if storage protection override enabled */
|
|
return vcpu->arch.sie_block->gcr[0] & CR0_STORAGE_PROTECTION_OVERRIDE;
|
|
}
|
|
|
|
static bool storage_prot_override_applies(u8 access_control)
|
|
{
|
|
/* matches special storage protection override key (9) -> allow */
|
|
return access_control == PAGE_SPO_ACC;
|
|
}
|
|
|
|
static int vcpu_check_access_key(struct kvm_vcpu *vcpu, u8 access_key,
|
|
enum gacc_mode mode, union asce asce, gpa_t gpa,
|
|
unsigned long ga, unsigned int len)
|
|
{
|
|
u8 storage_key, access_control;
|
|
unsigned long hva;
|
|
int r;
|
|
|
|
/* access key 0 matches any storage key -> allow */
|
|
if (access_key == 0)
|
|
return 0;
|
|
/*
|
|
* caller needs to ensure that gfn is accessible, so we can
|
|
* assume that this cannot fail
|
|
*/
|
|
hva = gfn_to_hva(vcpu->kvm, gpa_to_gfn(gpa));
|
|
mmap_read_lock(current->mm);
|
|
r = get_guest_storage_key(current->mm, hva, &storage_key);
|
|
mmap_read_unlock(current->mm);
|
|
if (r)
|
|
return r;
|
|
access_control = FIELD_GET(_PAGE_ACC_BITS, storage_key);
|
|
/* access key matches storage key -> allow */
|
|
if (access_control == access_key)
|
|
return 0;
|
|
if (mode == GACC_FETCH || mode == GACC_IFETCH) {
|
|
/* it is a fetch and fetch protection is off -> allow */
|
|
if (!(storage_key & _PAGE_FP_BIT))
|
|
return 0;
|
|
if (fetch_prot_override_applicable(vcpu, mode, asce) &&
|
|
fetch_prot_override_applies(ga, len))
|
|
return 0;
|
|
}
|
|
if (storage_prot_override_applicable(vcpu) &&
|
|
storage_prot_override_applies(access_control))
|
|
return 0;
|
|
return PGM_PROTECTION;
|
|
}
|
|
|
|
/**
|
|
* guest_range_to_gpas() - Calculate guest physical addresses of page fragments
|
|
* covering a logical range
|
|
* @vcpu: virtual cpu
|
|
* @ga: guest address, start of range
|
|
* @ar: access register
|
|
* @gpas: output argument, may be NULL
|
|
* @len: length of range in bytes
|
|
* @asce: address-space-control element to use for translation
|
|
* @mode: access mode
|
|
* @access_key: access key to mach the range's storage keys against
|
|
*
|
|
* Translate a logical range to a series of guest absolute addresses,
|
|
* such that the concatenation of page fragments starting at each gpa make up
|
|
* the whole range.
|
|
* The translation is performed as if done by the cpu for the given @asce, @ar,
|
|
* @mode and state of the @vcpu.
|
|
* If the translation causes an exception, its program interruption code is
|
|
* returned and the &struct kvm_s390_pgm_info pgm member of @vcpu is modified
|
|
* such that a subsequent call to kvm_s390_inject_prog_vcpu() will inject
|
|
* a correct exception into the guest.
|
|
* The resulting gpas are stored into @gpas, unless it is NULL.
|
|
*
|
|
* Note: All fragments except the first one start at the beginning of a page.
|
|
* When deriving the boundaries of a fragment from a gpa, all but the last
|
|
* fragment end at the end of the page.
|
|
*
|
|
* Return:
|
|
* * 0 - success
|
|
* * <0 - translation could not be performed, for example if guest
|
|
* memory could not be accessed
|
|
* * >0 - an access exception occurred. In this case the returned value
|
|
* is the program interruption code and the contents of pgm may
|
|
* be used to inject an exception into the guest.
|
|
*/
|
|
static int guest_range_to_gpas(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
|
|
unsigned long *gpas, unsigned long len,
|
|
const union asce asce, enum gacc_mode mode,
|
|
u8 access_key)
|
|
{
|
|
psw_t *psw = &vcpu->arch.sie_block->gpsw;
|
|
unsigned int offset = offset_in_page(ga);
|
|
unsigned int fragment_len;
|
|
int lap_enabled, rc = 0;
|
|
enum prot_type prot;
|
|
unsigned long gpa;
|
|
|
|
lap_enabled = low_address_protection_enabled(vcpu, asce);
|
|
while (min(PAGE_SIZE - offset, len) > 0) {
|
|
fragment_len = min(PAGE_SIZE - offset, len);
|
|
ga = kvm_s390_logical_to_effective(vcpu, ga);
|
|
if (mode == GACC_STORE && lap_enabled && is_low_address(ga))
|
|
return trans_exc(vcpu, PGM_PROTECTION, ga, ar, mode,
|
|
PROT_TYPE_LA);
|
|
if (psw_bits(*psw).dat) {
|
|
rc = guest_translate(vcpu, ga, &gpa, asce, mode, &prot);
|
|
if (rc < 0)
|
|
return rc;
|
|
} else {
|
|
gpa = kvm_s390_real_to_abs(vcpu, ga);
|
|
if (kvm_is_error_gpa(vcpu->kvm, gpa)) {
|
|
rc = PGM_ADDRESSING;
|
|
prot = PROT_NONE;
|
|
}
|
|
}
|
|
if (rc)
|
|
return trans_exc(vcpu, rc, ga, ar, mode, prot);
|
|
rc = vcpu_check_access_key(vcpu, access_key, mode, asce, gpa, ga,
|
|
fragment_len);
|
|
if (rc)
|
|
return trans_exc(vcpu, rc, ga, ar, mode, PROT_TYPE_KEYC);
|
|
if (gpas)
|
|
*gpas++ = gpa;
|
|
offset = 0;
|
|
ga += fragment_len;
|
|
len -= fragment_len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int access_guest_page(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa,
|
|
void *data, unsigned int len)
|
|
{
|
|
const unsigned int offset = offset_in_page(gpa);
|
|
const gfn_t gfn = gpa_to_gfn(gpa);
|
|
int rc;
|
|
|
|
if (mode == GACC_STORE)
|
|
rc = kvm_write_guest_page(kvm, gfn, data, offset, len);
|
|
else
|
|
rc = kvm_read_guest_page(kvm, gfn, data, offset, len);
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
access_guest_page_with_key(struct kvm *kvm, enum gacc_mode mode, gpa_t gpa,
|
|
void *data, unsigned int len, u8 access_key)
|
|
{
|
|
struct kvm_memory_slot *slot;
|
|
bool writable;
|
|
gfn_t gfn;
|
|
hva_t hva;
|
|
int rc;
|
|
|
|
gfn = gpa >> PAGE_SHIFT;
|
|
slot = gfn_to_memslot(kvm, gfn);
|
|
hva = gfn_to_hva_memslot_prot(slot, gfn, &writable);
|
|
|
|
if (kvm_is_error_hva(hva))
|
|
return PGM_ADDRESSING;
|
|
/*
|
|
* Check if it's a ro memslot, even tho that can't occur (they're unsupported).
|
|
* Don't try to actually handle that case.
|
|
*/
|
|
if (!writable && mode == GACC_STORE)
|
|
return -EOPNOTSUPP;
|
|
hva += offset_in_page(gpa);
|
|
if (mode == GACC_STORE)
|
|
rc = copy_to_user_key((void __user *)hva, data, len, access_key);
|
|
else
|
|
rc = copy_from_user_key(data, (void __user *)hva, len, access_key);
|
|
if (rc)
|
|
return PGM_PROTECTION;
|
|
if (mode == GACC_STORE)
|
|
mark_page_dirty_in_slot(kvm, slot, gfn);
|
|
return 0;
|
|
}
|
|
|
|
int access_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, void *data,
|
|
unsigned long len, enum gacc_mode mode, u8 access_key)
|
|
{
|
|
int offset = offset_in_page(gpa);
|
|
int fragment_len;
|
|
int rc;
|
|
|
|
while (min(PAGE_SIZE - offset, len) > 0) {
|
|
fragment_len = min(PAGE_SIZE - offset, len);
|
|
rc = access_guest_page_with_key(kvm, mode, gpa, data, fragment_len, access_key);
|
|
if (rc)
|
|
return rc;
|
|
offset = 0;
|
|
len -= fragment_len;
|
|
data += fragment_len;
|
|
gpa += fragment_len;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int access_guest_with_key(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar,
|
|
void *data, unsigned long len, enum gacc_mode mode,
|
|
u8 access_key)
|
|
{
|
|
psw_t *psw = &vcpu->arch.sie_block->gpsw;
|
|
unsigned long nr_pages, idx;
|
|
unsigned long gpa_array[2];
|
|
unsigned int fragment_len;
|
|
unsigned long *gpas;
|
|
enum prot_type prot;
|
|
int need_ipte_lock;
|
|
union asce asce;
|
|
bool try_storage_prot_override;
|
|
bool try_fetch_prot_override;
|
|
int rc;
|
|
|
|
if (!len)
|
|
return 0;
|
|
ga = kvm_s390_logical_to_effective(vcpu, ga);
|
|
rc = get_vcpu_asce(vcpu, &asce, ga, ar, mode);
|
|
if (rc)
|
|
return rc;
|
|
nr_pages = (((ga & ~PAGE_MASK) + len - 1) >> PAGE_SHIFT) + 1;
|
|
gpas = gpa_array;
|
|
if (nr_pages > ARRAY_SIZE(gpa_array))
|
|
gpas = vmalloc(array_size(nr_pages, sizeof(unsigned long)));
|
|
if (!gpas)
|
|
return -ENOMEM;
|
|
try_fetch_prot_override = fetch_prot_override_applicable(vcpu, mode, asce);
|
|
try_storage_prot_override = storage_prot_override_applicable(vcpu);
|
|
need_ipte_lock = psw_bits(*psw).dat && !asce.r;
|
|
if (need_ipte_lock)
|
|
ipte_lock(vcpu->kvm);
|
|
/*
|
|
* Since we do the access further down ultimately via a move instruction
|
|
* that does key checking and returns an error in case of a protection
|
|
* violation, we don't need to do the check during address translation.
|
|
* Skip it by passing access key 0, which matches any storage key,
|
|
* obviating the need for any further checks. As a result the check is
|
|
* handled entirely in hardware on access, we only need to take care to
|
|
* forego key protection checking if fetch protection override applies or
|
|
* retry with the special key 9 in case of storage protection override.
|
|
*/
|
|
rc = guest_range_to_gpas(vcpu, ga, ar, gpas, len, asce, mode, 0);
|
|
if (rc)
|
|
goto out_unlock;
|
|
for (idx = 0; idx < nr_pages; idx++) {
|
|
fragment_len = min(PAGE_SIZE - offset_in_page(gpas[idx]), len);
|
|
if (try_fetch_prot_override && fetch_prot_override_applies(ga, fragment_len)) {
|
|
rc = access_guest_page(vcpu->kvm, mode, gpas[idx],
|
|
data, fragment_len);
|
|
} else {
|
|
rc = access_guest_page_with_key(vcpu->kvm, mode, gpas[idx],
|
|
data, fragment_len, access_key);
|
|
}
|
|
if (rc == PGM_PROTECTION && try_storage_prot_override)
|
|
rc = access_guest_page_with_key(vcpu->kvm, mode, gpas[idx],
|
|
data, fragment_len, PAGE_SPO_ACC);
|
|
if (rc)
|
|
break;
|
|
len -= fragment_len;
|
|
data += fragment_len;
|
|
ga = kvm_s390_logical_to_effective(vcpu, ga + fragment_len);
|
|
}
|
|
if (rc > 0) {
|
|
bool terminate = (mode == GACC_STORE) && (idx > 0);
|
|
|
|
if (rc == PGM_PROTECTION)
|
|
prot = PROT_TYPE_KEYC;
|
|
else
|
|
prot = PROT_NONE;
|
|
rc = trans_exc_ending(vcpu, rc, ga, ar, mode, prot, terminate);
|
|
}
|
|
out_unlock:
|
|
if (need_ipte_lock)
|
|
ipte_unlock(vcpu->kvm);
|
|
if (nr_pages > ARRAY_SIZE(gpa_array))
|
|
vfree(gpas);
|
|
return rc;
|
|
}
|
|
|
|
int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
|
|
void *data, unsigned long len, enum gacc_mode mode)
|
|
{
|
|
unsigned int fragment_len;
|
|
unsigned long gpa;
|
|
int rc = 0;
|
|
|
|
while (len && !rc) {
|
|
gpa = kvm_s390_real_to_abs(vcpu, gra);
|
|
fragment_len = min(PAGE_SIZE - offset_in_page(gpa), len);
|
|
rc = access_guest_page(vcpu->kvm, mode, gpa, data, fragment_len);
|
|
len -= fragment_len;
|
|
gra += fragment_len;
|
|
data += fragment_len;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* cmpxchg_guest_abs_with_key() - Perform cmpxchg on guest absolute address.
|
|
* @kvm: Virtual machine instance.
|
|
* @gpa: Absolute guest address of the location to be changed.
|
|
* @len: Operand length of the cmpxchg, required: 1 <= len <= 16. Providing a
|
|
* non power of two will result in failure.
|
|
* @old_addr: Pointer to old value. If the location at @gpa contains this value,
|
|
* the exchange will succeed. After calling cmpxchg_guest_abs_with_key()
|
|
* *@old_addr contains the value at @gpa before the attempt to
|
|
* exchange the value.
|
|
* @new: The value to place at @gpa.
|
|
* @access_key: The access key to use for the guest access.
|
|
* @success: output value indicating if an exchange occurred.
|
|
*
|
|
* Atomically exchange the value at @gpa by @new, if it contains *@old.
|
|
* Honors storage keys.
|
|
*
|
|
* Return: * 0: successful exchange
|
|
* * >0: a program interruption code indicating the reason cmpxchg could
|
|
* not be attempted
|
|
* * -EINVAL: address misaligned or len not power of two
|
|
* * -EAGAIN: transient failure (len 1 or 2)
|
|
* * -EOPNOTSUPP: read-only memslot (should never occur)
|
|
*/
|
|
int cmpxchg_guest_abs_with_key(struct kvm *kvm, gpa_t gpa, int len,
|
|
__uint128_t *old_addr, __uint128_t new,
|
|
u8 access_key, bool *success)
|
|
{
|
|
gfn_t gfn = gpa_to_gfn(gpa);
|
|
struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
|
|
bool writable;
|
|
hva_t hva;
|
|
int ret;
|
|
|
|
if (!IS_ALIGNED(gpa, len))
|
|
return -EINVAL;
|
|
|
|
hva = gfn_to_hva_memslot_prot(slot, gfn, &writable);
|
|
if (kvm_is_error_hva(hva))
|
|
return PGM_ADDRESSING;
|
|
/*
|
|
* Check if it's a read-only memslot, even though that cannot occur
|
|
* since those are unsupported.
|
|
* Don't try to actually handle that case.
|
|
*/
|
|
if (!writable)
|
|
return -EOPNOTSUPP;
|
|
|
|
hva += offset_in_page(gpa);
|
|
/*
|
|
* The cmpxchg_user_key macro depends on the type of "old", so we need
|
|
* a case for each valid length and get some code duplication as long
|
|
* as we don't introduce a new macro.
|
|
*/
|
|
switch (len) {
|
|
case 1: {
|
|
u8 old;
|
|
|
|
ret = cmpxchg_user_key((u8 __user *)hva, &old, *old_addr, new, access_key);
|
|
*success = !ret && old == *old_addr;
|
|
*old_addr = old;
|
|
break;
|
|
}
|
|
case 2: {
|
|
u16 old;
|
|
|
|
ret = cmpxchg_user_key((u16 __user *)hva, &old, *old_addr, new, access_key);
|
|
*success = !ret && old == *old_addr;
|
|
*old_addr = old;
|
|
break;
|
|
}
|
|
case 4: {
|
|
u32 old;
|
|
|
|
ret = cmpxchg_user_key((u32 __user *)hva, &old, *old_addr, new, access_key);
|
|
*success = !ret && old == *old_addr;
|
|
*old_addr = old;
|
|
break;
|
|
}
|
|
case 8: {
|
|
u64 old;
|
|
|
|
ret = cmpxchg_user_key((u64 __user *)hva, &old, *old_addr, new, access_key);
|
|
*success = !ret && old == *old_addr;
|
|
*old_addr = old;
|
|
break;
|
|
}
|
|
case 16: {
|
|
__uint128_t old;
|
|
|
|
ret = cmpxchg_user_key((__uint128_t __user *)hva, &old, *old_addr, new, access_key);
|
|
*success = !ret && old == *old_addr;
|
|
*old_addr = old;
|
|
break;
|
|
}
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (*success)
|
|
mark_page_dirty_in_slot(kvm, slot, gfn);
|
|
/*
|
|
* Assume that the fault is caused by protection, either key protection
|
|
* or user page write protection.
|
|
*/
|
|
if (ret == -EFAULT)
|
|
ret = PGM_PROTECTION;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* guest_translate_address_with_key - translate guest logical into guest absolute address
|
|
* @vcpu: virtual cpu
|
|
* @gva: Guest virtual address
|
|
* @ar: Access register
|
|
* @gpa: Guest physical address
|
|
* @mode: Translation access mode
|
|
* @access_key: access key to mach the storage key with
|
|
*
|
|
* Parameter semantics are the same as the ones from guest_translate.
|
|
* The memory contents at the guest address are not changed.
|
|
*
|
|
* Note: The IPTE lock is not taken during this function, so the caller
|
|
* has to take care of this.
|
|
*/
|
|
int guest_translate_address_with_key(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
|
|
unsigned long *gpa, enum gacc_mode mode,
|
|
u8 access_key)
|
|
{
|
|
union asce asce;
|
|
int rc;
|
|
|
|
gva = kvm_s390_logical_to_effective(vcpu, gva);
|
|
rc = get_vcpu_asce(vcpu, &asce, gva, ar, mode);
|
|
if (rc)
|
|
return rc;
|
|
return guest_range_to_gpas(vcpu, gva, ar, gpa, 1, asce, mode,
|
|
access_key);
|
|
}
|
|
|
|
/**
|
|
* check_gva_range - test a range of guest virtual addresses for accessibility
|
|
* @vcpu: virtual cpu
|
|
* @gva: Guest virtual address
|
|
* @ar: Access register
|
|
* @length: Length of test range
|
|
* @mode: Translation access mode
|
|
* @access_key: access key to mach the storage keys with
|
|
*/
|
|
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar,
|
|
unsigned long length, enum gacc_mode mode, u8 access_key)
|
|
{
|
|
union asce asce;
|
|
int rc = 0;
|
|
|
|
rc = get_vcpu_asce(vcpu, &asce, gva, ar, mode);
|
|
if (rc)
|
|
return rc;
|
|
ipte_lock(vcpu->kvm);
|
|
rc = guest_range_to_gpas(vcpu, gva, ar, NULL, length, asce, mode,
|
|
access_key);
|
|
ipte_unlock(vcpu->kvm);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* check_gpa_range - test a range of guest physical addresses for accessibility
|
|
* @kvm: virtual machine instance
|
|
* @gpa: guest physical address
|
|
* @length: length of test range
|
|
* @mode: access mode to test, relevant for storage keys
|
|
* @access_key: access key to mach the storage keys with
|
|
*/
|
|
int check_gpa_range(struct kvm *kvm, unsigned long gpa, unsigned long length,
|
|
enum gacc_mode mode, u8 access_key)
|
|
{
|
|
unsigned int fragment_len;
|
|
int rc = 0;
|
|
|
|
while (length && !rc) {
|
|
fragment_len = min(PAGE_SIZE - offset_in_page(gpa), length);
|
|
rc = vm_check_access_key(kvm, access_key, mode, gpa);
|
|
length -= fragment_len;
|
|
gpa += fragment_len;
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* kvm_s390_check_low_addr_prot_real - check for low-address protection
|
|
* @vcpu: virtual cpu
|
|
* @gra: Guest real address
|
|
*
|
|
* Checks whether an address is subject to low-address protection and set
|
|
* up vcpu->arch.pgm accordingly if necessary.
|
|
*
|
|
* Return: 0 if no protection exception, or PGM_PROTECTION if protected.
|
|
*/
|
|
int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra)
|
|
{
|
|
union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]};
|
|
|
|
if (!ctlreg0.lap || !is_low_address(gra))
|
|
return 0;
|
|
return trans_exc(vcpu, PGM_PROTECTION, gra, 0, GACC_STORE, PROT_TYPE_LA);
|
|
}
|
|
|
|
/**
|
|
* kvm_s390_shadow_tables - walk the guest page table and create shadow tables
|
|
* @sg: pointer to the shadow guest address space structure
|
|
* @saddr: faulting address in the shadow gmap
|
|
* @pgt: pointer to the beginning of the page table for the given address if
|
|
* successful (return value 0), or to the first invalid DAT entry in
|
|
* case of exceptions (return value > 0)
|
|
* @dat_protection: referenced memory is write protected
|
|
* @fake: pgt references contiguous guest memory block, not a pgtable
|
|
*/
|
|
static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,
|
|
unsigned long *pgt, int *dat_protection,
|
|
int *fake)
|
|
{
|
|
struct kvm *kvm;
|
|
struct gmap *parent;
|
|
union asce asce;
|
|
union vaddress vaddr;
|
|
unsigned long ptr;
|
|
int rc;
|
|
|
|
*fake = 0;
|
|
*dat_protection = 0;
|
|
kvm = sg->private;
|
|
parent = sg->parent;
|
|
vaddr.addr = saddr;
|
|
asce.val = sg->orig_asce;
|
|
ptr = asce.origin * PAGE_SIZE;
|
|
if (asce.r) {
|
|
*fake = 1;
|
|
ptr = 0;
|
|
asce.dt = ASCE_TYPE_REGION1;
|
|
}
|
|
switch (asce.dt) {
|
|
case ASCE_TYPE_REGION1:
|
|
if (vaddr.rfx01 > asce.tl && !*fake)
|
|
return PGM_REGION_FIRST_TRANS;
|
|
break;
|
|
case ASCE_TYPE_REGION2:
|
|
if (vaddr.rfx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.rsx01 > asce.tl)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
break;
|
|
case ASCE_TYPE_REGION3:
|
|
if (vaddr.rfx || vaddr.rsx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.rtx01 > asce.tl)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
break;
|
|
case ASCE_TYPE_SEGMENT:
|
|
if (vaddr.rfx || vaddr.rsx || vaddr.rtx)
|
|
return PGM_ASCE_TYPE;
|
|
if (vaddr.sx01 > asce.tl)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
break;
|
|
}
|
|
|
|
switch (asce.dt) {
|
|
case ASCE_TYPE_REGION1: {
|
|
union region1_table_entry rfte;
|
|
|
|
if (*fake) {
|
|
ptr += vaddr.rfx * _REGION1_SIZE;
|
|
rfte.val = ptr;
|
|
goto shadow_r2t;
|
|
}
|
|
*pgt = ptr + vaddr.rfx * 8;
|
|
rc = gmap_read_table(parent, ptr + vaddr.rfx * 8, &rfte.val);
|
|
if (rc)
|
|
return rc;
|
|
if (rfte.i)
|
|
return PGM_REGION_FIRST_TRANS;
|
|
if (rfte.tt != TABLE_TYPE_REGION1)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (vaddr.rsx01 < rfte.tf || vaddr.rsx01 > rfte.tl)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
if (sg->edat_level >= 1)
|
|
*dat_protection |= rfte.p;
|
|
ptr = rfte.rto * PAGE_SIZE;
|
|
shadow_r2t:
|
|
rc = gmap_shadow_r2t(sg, saddr, rfte.val, *fake);
|
|
if (rc)
|
|
return rc;
|
|
kvm->stat.gmap_shadow_r1_entry++;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_REGION2: {
|
|
union region2_table_entry rste;
|
|
|
|
if (*fake) {
|
|
ptr += vaddr.rsx * _REGION2_SIZE;
|
|
rste.val = ptr;
|
|
goto shadow_r3t;
|
|
}
|
|
*pgt = ptr + vaddr.rsx * 8;
|
|
rc = gmap_read_table(parent, ptr + vaddr.rsx * 8, &rste.val);
|
|
if (rc)
|
|
return rc;
|
|
if (rste.i)
|
|
return PGM_REGION_SECOND_TRANS;
|
|
if (rste.tt != TABLE_TYPE_REGION2)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (vaddr.rtx01 < rste.tf || vaddr.rtx01 > rste.tl)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
if (sg->edat_level >= 1)
|
|
*dat_protection |= rste.p;
|
|
ptr = rste.rto * PAGE_SIZE;
|
|
shadow_r3t:
|
|
rste.p |= *dat_protection;
|
|
rc = gmap_shadow_r3t(sg, saddr, rste.val, *fake);
|
|
if (rc)
|
|
return rc;
|
|
kvm->stat.gmap_shadow_r2_entry++;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_REGION3: {
|
|
union region3_table_entry rtte;
|
|
|
|
if (*fake) {
|
|
ptr += vaddr.rtx * _REGION3_SIZE;
|
|
rtte.val = ptr;
|
|
goto shadow_sgt;
|
|
}
|
|
*pgt = ptr + vaddr.rtx * 8;
|
|
rc = gmap_read_table(parent, ptr + vaddr.rtx * 8, &rtte.val);
|
|
if (rc)
|
|
return rc;
|
|
if (rtte.i)
|
|
return PGM_REGION_THIRD_TRANS;
|
|
if (rtte.tt != TABLE_TYPE_REGION3)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (rtte.cr && asce.p && sg->edat_level >= 2)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (rtte.fc && sg->edat_level >= 2) {
|
|
*dat_protection |= rtte.fc0.p;
|
|
*fake = 1;
|
|
ptr = rtte.fc1.rfaa * _REGION3_SIZE;
|
|
rtte.val = ptr;
|
|
goto shadow_sgt;
|
|
}
|
|
if (vaddr.sx01 < rtte.fc0.tf || vaddr.sx01 > rtte.fc0.tl)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
if (sg->edat_level >= 1)
|
|
*dat_protection |= rtte.fc0.p;
|
|
ptr = rtte.fc0.sto * PAGE_SIZE;
|
|
shadow_sgt:
|
|
rtte.fc0.p |= *dat_protection;
|
|
rc = gmap_shadow_sgt(sg, saddr, rtte.val, *fake);
|
|
if (rc)
|
|
return rc;
|
|
kvm->stat.gmap_shadow_r3_entry++;
|
|
}
|
|
fallthrough;
|
|
case ASCE_TYPE_SEGMENT: {
|
|
union segment_table_entry ste;
|
|
|
|
if (*fake) {
|
|
ptr += vaddr.sx * _SEGMENT_SIZE;
|
|
ste.val = ptr;
|
|
goto shadow_pgt;
|
|
}
|
|
*pgt = ptr + vaddr.sx * 8;
|
|
rc = gmap_read_table(parent, ptr + vaddr.sx * 8, &ste.val);
|
|
if (rc)
|
|
return rc;
|
|
if (ste.i)
|
|
return PGM_SEGMENT_TRANSLATION;
|
|
if (ste.tt != TABLE_TYPE_SEGMENT)
|
|
return PGM_TRANSLATION_SPEC;
|
|
if (ste.cs && asce.p)
|
|
return PGM_TRANSLATION_SPEC;
|
|
*dat_protection |= ste.fc0.p;
|
|
if (ste.fc && sg->edat_level >= 1) {
|
|
*fake = 1;
|
|
ptr = ste.fc1.sfaa * _SEGMENT_SIZE;
|
|
ste.val = ptr;
|
|
goto shadow_pgt;
|
|
}
|
|
ptr = ste.fc0.pto * (PAGE_SIZE / 2);
|
|
shadow_pgt:
|
|
ste.fc0.p |= *dat_protection;
|
|
rc = gmap_shadow_pgt(sg, saddr, ste.val, *fake);
|
|
if (rc)
|
|
return rc;
|
|
kvm->stat.gmap_shadow_sg_entry++;
|
|
}
|
|
}
|
|
/* Return the parent address of the page table */
|
|
*pgt = ptr;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* kvm_s390_shadow_fault - handle fault on a shadow page table
|
|
* @vcpu: virtual cpu
|
|
* @sg: pointer to the shadow guest address space structure
|
|
* @saddr: faulting address in the shadow gmap
|
|
* @datptr: will contain the address of the faulting DAT table entry, or of
|
|
* the valid leaf, plus some flags
|
|
*
|
|
* Returns: - 0 if the shadow fault was successfully resolved
|
|
* - > 0 (pgm exception code) on exceptions while faulting
|
|
* - -EAGAIN if the caller can retry immediately
|
|
* - -EFAULT when accessing invalid guest addresses
|
|
* - -ENOMEM if out of memory
|
|
*/
|
|
int kvm_s390_shadow_fault(struct kvm_vcpu *vcpu, struct gmap *sg,
|
|
unsigned long saddr, unsigned long *datptr)
|
|
{
|
|
union vaddress vaddr;
|
|
union page_table_entry pte;
|
|
unsigned long pgt = 0;
|
|
int dat_protection, fake;
|
|
int rc;
|
|
|
|
mmap_read_lock(sg->mm);
|
|
/*
|
|
* We don't want any guest-2 tables to change - so the parent
|
|
* tables/pointers we read stay valid - unshadowing is however
|
|
* always possible - only guest_table_lock protects us.
|
|
*/
|
|
ipte_lock(vcpu->kvm);
|
|
|
|
rc = gmap_shadow_pgt_lookup(sg, saddr, &pgt, &dat_protection, &fake);
|
|
if (rc)
|
|
rc = kvm_s390_shadow_tables(sg, saddr, &pgt, &dat_protection,
|
|
&fake);
|
|
|
|
vaddr.addr = saddr;
|
|
if (fake) {
|
|
pte.val = pgt + vaddr.px * PAGE_SIZE;
|
|
goto shadow_page;
|
|
}
|
|
|
|
switch (rc) {
|
|
case PGM_SEGMENT_TRANSLATION:
|
|
case PGM_REGION_THIRD_TRANS:
|
|
case PGM_REGION_SECOND_TRANS:
|
|
case PGM_REGION_FIRST_TRANS:
|
|
pgt |= PEI_NOT_PTE;
|
|
break;
|
|
case 0:
|
|
pgt += vaddr.px * 8;
|
|
rc = gmap_read_table(sg->parent, pgt, &pte.val);
|
|
}
|
|
if (datptr)
|
|
*datptr = pgt | dat_protection * PEI_DAT_PROT;
|
|
if (!rc && pte.i)
|
|
rc = PGM_PAGE_TRANSLATION;
|
|
if (!rc && pte.z)
|
|
rc = PGM_TRANSLATION_SPEC;
|
|
shadow_page:
|
|
pte.p |= dat_protection;
|
|
if (!rc)
|
|
rc = gmap_shadow_page(sg, saddr, __pte(pte.val));
|
|
vcpu->kvm->stat.gmap_shadow_pg_entry++;
|
|
ipte_unlock(vcpu->kvm);
|
|
mmap_read_unlock(sg->mm);
|
|
return rc;
|
|
}
|