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KVM: s390: gaccess: introduce access modes 

We will need special handling when fetching instructions, so let's
introduce new guest access modes GACC_FETCH and GACC_STORE instead
of a write flag. An additional patch will then introduce GACC_IFETCH.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2015-11-16 15:42:11 +01:00 committed by Christian Borntraeger
parent 634790b827
commit 92c9632119
5 changed files with 43 additions and 35 deletions
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46
arch/s390/kvm/gaccess.c
View File

@ -373,7 +373,7 @@ void ipte_unlock(struct kvm_vcpu *vcpu)
}
static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar,
int write)
enum gacc_mode mode)
{
union alet alet;
struct ale ale;
@ -454,7 +454,7 @@ static int ar_translation(struct kvm_vcpu *vcpu, union asce *asce, ar_t ar,
}
}
if (ale.fo == 1 && write)
if (ale.fo == 1 && mode == GACC_STORE)
return PGM_PROTECTION;
asce->val = aste.asce;
@ -477,7 +477,7 @@ enum {
};
static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
ar_t ar, int write)
ar_t ar, enum gacc_mode mode)
{
int rc;
psw_t *psw = &vcpu->arch.sie_block->gpsw;
@ -486,7 +486,7 @@ static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
memset(pgm, 0, sizeof(*pgm));
tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
tec_bits->fsi = write ? FSI_STORE : FSI_FETCH;
tec_bits->fsi = mode == GACC_STORE ? FSI_STORE : FSI_FETCH;
tec_bits->as = psw_bits(*psw).as;
if (!psw_bits(*psw).t) {
@ -506,7 +506,7 @@ static int get_vcpu_asce(struct kvm_vcpu *vcpu, union asce *asce,
asce->val = vcpu->arch.sie_block->gcr[13];
return 0;
case PSW_AS_ACCREG:
rc = ar_translation(vcpu, asce, ar, write);
rc = ar_translation(vcpu, asce, ar, mode);
switch (rc) {
case PGM_ALEN_TRANSLATION:
case PGM_ALE_SEQUENCE:
@ -538,7 +538,7 @@ static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val)
* @gva: guest virtual address
* @gpa: points to where guest physical (absolute) address should be stored
* @asce: effective asce
* @write: indicates if access is a write access
* @mode: indicates the access mode to be used
*
* Translate a guest virtual address into a guest absolute address by means
* of dynamic address translation as specified by the architecture.
@ -554,7 +554,7 @@ static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val)
*/
static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva,
unsigned long *gpa, const union asce asce,
int write)
enum gacc_mode mode)
{
union vaddress vaddr = {.addr = gva};
union raddress raddr = {.addr = gva};
@ -699,7 +699,7 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva,
real_address:
raddr.addr = kvm_s390_real_to_abs(vcpu, raddr.addr);
absolute_address:
if (write && dat_protection)
if (mode == GACC_STORE && dat_protection)
return PGM_PROTECTION;
if (kvm_is_error_gpa(vcpu->kvm, raddr.addr))
return PGM_ADDRESSING;
@ -728,7 +728,7 @@ static int low_address_protection_enabled(struct kvm_vcpu *vcpu,
static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga,
unsigned long *pages, unsigned long nr_pages,
const union asce asce, int write)
const union asce asce, enum gacc_mode mode)
{
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
psw_t *psw = &vcpu->arch.sie_block->gpsw;
@ -740,13 +740,13 @@ static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga,
while (nr_pages) {
ga = kvm_s390_logical_to_effective(vcpu, ga);
tec_bits->addr = ga >> PAGE_SHIFT;
if (write && lap_enabled && is_low_address(ga)) {
if (mode == GACC_STORE && lap_enabled && is_low_address(ga)) {
pgm->code = PGM_PROTECTION;
return pgm->code;
}
ga &= PAGE_MASK;
if (psw_bits(*psw).t) {
rc = guest_translate(vcpu, ga, pages, asce, write);
rc = guest_translate(vcpu, ga, pages, asce, mode);
if (rc < 0)
return rc;
if (rc == PGM_PROTECTION)
@ -768,7 +768,7 @@ static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga,
}
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
unsigned long len, int write)
unsigned long len, enum gacc_mode mode)
{
psw_t *psw = &vcpu->arch.sie_block->gpsw;
unsigned long _len, nr_pages, gpa, idx;
@ -780,7 +780,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
if (!len)
return 0;
rc = get_vcpu_asce(vcpu, &asce, ar, write);
rc = get_vcpu_asce(vcpu, &asce, ar, mode);
if (rc)
return rc;
nr_pages = (((ga & ~PAGE_MASK) + len - 1) >> PAGE_SHIFT) + 1;
@ -792,11 +792,11 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
need_ipte_lock = psw_bits(*psw).t && !asce.r;
if (need_ipte_lock)
ipte_lock(vcpu);
rc = guest_page_range(vcpu, ga, pages, nr_pages, asce, write);
rc = guest_page_range(vcpu, ga, pages, nr_pages, asce, mode);
for (idx = 0; idx < nr_pages && !rc; idx++) {
gpa = *(pages + idx) + (ga & ~PAGE_MASK);
_len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
if (write)
if (mode == GACC_STORE)
rc = kvm_write_guest(vcpu->kvm, gpa, data, _len);
else
rc = kvm_read_guest(vcpu->kvm, gpa, data, _len);
@ -812,7 +812,7 @@ int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
}
int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
void *data, unsigned long len, int write)
void *data, unsigned long len, enum gacc_mode mode)
{
unsigned long _len, gpa;
int rc = 0;
@ -820,7 +820,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
while (len && !rc) {
gpa = kvm_s390_real_to_abs(vcpu, gra);
_len = min(PAGE_SIZE - (gpa & ~PAGE_MASK), len);
if (write)
if (mode)
rc = write_guest_abs(vcpu, gpa, data, _len);
else
rc = read_guest_abs(vcpu, gpa, data, _len);
@ -841,7 +841,7 @@ int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
* has to take care of this.
*/
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
unsigned long *gpa, int write)
unsigned long *gpa, enum gacc_mode mode)
{
struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
psw_t *psw = &vcpu->arch.sie_block->gpsw;
@ -851,19 +851,19 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
gva = kvm_s390_logical_to_effective(vcpu, gva);
tec = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
rc = get_vcpu_asce(vcpu, &asce, ar, write);
rc = get_vcpu_asce(vcpu, &asce, ar, mode);
tec->addr = gva >> PAGE_SHIFT;
if (rc)
return rc;
if (is_low_address(gva) && low_address_protection_enabled(vcpu, asce)) {
if (write) {
if (mode == GACC_STORE) {
rc = pgm->code = PGM_PROTECTION;
return rc;
}
}
if (psw_bits(*psw).t && !asce.r) { /* Use DAT? */
rc = guest_translate(vcpu, gva, gpa, asce, write);
rc = guest_translate(vcpu, gva, gpa, asce, mode);
if (rc > 0) {
if (rc == PGM_PROTECTION)
tec->b61 = 1;
@ -883,7 +883,7 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
* check_gva_range - test a range of guest virtual addresses for accessibility
*/
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
unsigned long length, int is_write)
unsigned long length, enum gacc_mode mode)
{
unsigned long gpa;
unsigned long currlen;
@ -892,7 +892,7 @@ int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
ipte_lock(vcpu);
while (length > 0 && !rc) {
currlen = min(length, PAGE_SIZE - (gva % PAGE_SIZE));
rc = guest_translate_address(vcpu, gva, ar, &gpa, is_write);
rc = guest_translate_address(vcpu, gva, ar, &gpa, mode);
gva += currlen;
length -= currlen;
}

17
arch/s390/kvm/gaccess.h
View File

@ -155,16 +155,21 @@ int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
return kvm_read_guest(vcpu->kvm, gpa, data, len);
}
enum gacc_mode {
GACC_FETCH,
GACC_STORE,
};
int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
ar_t ar, unsigned long *gpa, int write);
ar_t ar, unsigned long *gpa, enum gacc_mode mode);
int check_gva_range(struct kvm_vcpu *vcpu, unsigned long gva, ar_t ar,
unsigned long length, int is_write);
unsigned long length, enum gacc_mode mode);
int access_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
unsigned long len, int write);
unsigned long len, enum gacc_mode mode);
int access_guest_real(struct kvm_vcpu *vcpu, unsigned long gra,
void *data, unsigned long len, int write);
void *data, unsigned long len, enum gacc_mode mode);
/**
* write_guest - copy data from kernel space to guest space
@ -215,7 +220,7 @@ static inline __must_check
int write_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
unsigned long len)
{
return access_guest(vcpu, ga, ar, data, len, 1);
return access_guest(vcpu, ga, ar, data, len, GACC_STORE);
}
/**
@ -235,7 +240,7 @@ static inline __must_check
int read_guest(struct kvm_vcpu *vcpu, unsigned long ga, ar_t ar, void *data,
unsigned long len)
{
return access_guest(vcpu, ga, ar, data, len, 0);
return access_guest(vcpu, ga, ar, data, len, GACC_FETCH);
}
/**

4
arch/s390/kvm/intercept.c
View File

@ -317,7 +317,7 @@ static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
/* Make sure that the source is paged-in */
rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg2],
reg2, &srcaddr, 0);
reg2, &srcaddr, GACC_FETCH);
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
rc = kvm_arch_fault_in_page(vcpu, srcaddr, 0);
@ -326,7 +326,7 @@ static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
/* Make sure that the destination is paged-in */
rc = guest_translate_address(vcpu, vcpu->run->s.regs.gprs[reg1],
reg1, &dstaddr, 1);
reg1, &dstaddr, GACC_STORE);
if (rc)
return kvm_s390_inject_prog_cond(vcpu, rc);
rc = kvm_arch_fault_in_page(vcpu, dstaddr, 1);

6
arch/s390/kvm/kvm-s390.c
View File

@ -2610,7 +2610,8 @@ static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
switch (mop->op) {
case KVM_S390_MEMOP_LOGICAL_READ:
if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, false);
r = check_gva_range(vcpu, mop->gaddr, mop->ar,
mop->size, GACC_FETCH);
break;
}
r = read_guest(vcpu, mop->gaddr, mop->ar, tmpbuf, mop->size);
@ -2621,7 +2622,8 @@ static long kvm_s390_guest_mem_op(struct kvm_vcpu *vcpu,
break;
case KVM_S390_MEMOP_LOGICAL_WRITE:
if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size, true);
r = check_gva_range(vcpu, mop->gaddr, mop->ar,
mop->size, GACC_STORE);
break;
}
if (copy_from_user(tmpbuf, uaddr, mop->size)) {

5
arch/s390/kvm/priv.c
View File

@ -981,11 +981,12 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
return -EOPNOTSUPP;
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_DAT)
ipte_lock(vcpu);
ret = guest_translate_address(vcpu, address1, ar, &gpa, 1);
ret = guest_translate_address(vcpu, address1, ar, &gpa, GACC_STORE);
if (ret == PGM_PROTECTION) {
/* Write protected? Try again with read-only... */
cc = 1;
ret = guest_translate_address(vcpu, address1, ar, &gpa, 0);
ret = guest_translate_address(vcpu, address1, ar, &gpa,
GACC_FETCH);
}
if (ret) {
if (ret == PGM_ADDRESSING || ret == PGM_TRANSLATION_SPEC) {