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KVM: s390: vsie: store guest addresses of satellite blocks in vsie_page
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This way, the values cannot change, even if another VCPU might try to
mess with the nested SCB currently getting executed by another VCPU.

We now always use the same gpa for pinning and unpinning a page (for
unpinning, it is only relevant to mark the guest page dirty for
migration).

Signed-off-by: David Hildenbrand <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Christian Borntraeger <[email protected]>
Acked-by: Cornelia Huck <[email protected]>
Signed-off-by: Christian Borntraeger <[email protected]>
davidhildenbrand authored and borntraeger committed Jan 24, 2018

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This commit was signed with the committer’s verified signature.
Duhemm Martin Duhem
1 parent b3ecd4a commit 15e5020
Showing 1 changed file with 22 additions and 15 deletions.
37 changes: 22 additions & 15 deletions arch/s390/kvm/vsie.c
Original file line number Diff line number Diff line change
@@ -38,7 +38,13 @@ struct vsie_page {
struct gmap *gmap; /* 0x0220 */
/* address of the last reported fault to guest2 */
unsigned long fault_addr; /* 0x0228 */
__u8 reserved[0x0700 - 0x0230]; /* 0x0230 */
/* calculated guest addresses of satellite control blocks */
gpa_t sca_gpa; /* 0x0230 */
gpa_t itdba_gpa; /* 0x0238 */
gpa_t gvrd_gpa; /* 0x0240 */
gpa_t riccbd_gpa; /* 0x0248 */
gpa_t sdnx_gpa; /* 0x0250 */
__u8 reserved[0x0700 - 0x0258]; /* 0x0258 */
struct kvm_s390_crypto_cb crycb; /* 0x0700 */
__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */
};
@@ -475,46 +481,42 @@ static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
/* unpin all blocks previously pinned by pin_blocks(), marking them dirty */
static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
hpa_t hpa;
gpa_t gpa;

hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol;
if (hpa) {
gpa = scb_o->scaol & ~0xfUL;
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
gpa |= (u64) scb_o->scaoh << 32;
unpin_guest_page(vcpu->kvm, gpa, hpa);
unpin_guest_page(vcpu->kvm, vsie_page->sca_gpa, hpa);
vsie_page->sca_gpa = 0;
scb_s->scaol = 0;
scb_s->scaoh = 0;
}

hpa = scb_s->itdba;
if (hpa) {
gpa = scb_o->itdba & ~0xffUL;
unpin_guest_page(vcpu->kvm, gpa, hpa);
unpin_guest_page(vcpu->kvm, vsie_page->itdba_gpa, hpa);
vsie_page->itdba_gpa = 0;
scb_s->itdba = 0;
}

hpa = scb_s->gvrd;
if (hpa) {
gpa = scb_o->gvrd & ~0x1ffUL;
unpin_guest_page(vcpu->kvm, gpa, hpa);
unpin_guest_page(vcpu->kvm, vsie_page->gvrd_gpa, hpa);
vsie_page->gvrd_gpa = 0;
scb_s->gvrd = 0;
}

hpa = scb_s->riccbd;
if (hpa) {
gpa = scb_o->riccbd & ~0x3fUL;
unpin_guest_page(vcpu->kvm, gpa, hpa);
unpin_guest_page(vcpu->kvm, vsie_page->riccbd_gpa, hpa);
vsie_page->riccbd_gpa = 0;
scb_s->riccbd = 0;
}

hpa = scb_s->sdnxo;
if (hpa) {
gpa = scb_o->sdnxo;
unpin_guest_page(vcpu->kvm, gpa, hpa);
unpin_guest_page(vcpu->kvm, vsie_page->sdnx_gpa, hpa);
vsie_page->sdnx_gpa = 0;
scb_s->sdnxo = 0;
}
}
@@ -559,6 +561,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
}
if (rc)
goto unpin;
vsie_page->sca_gpa = gpa;
scb_s->scaoh = (u32)((u64)hpa >> 32);
scb_s->scaol = (u32)(u64)hpa;
}
@@ -575,6 +578,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
rc = set_validity_icpt(scb_s, 0x0080U);
goto unpin;
}
vsie_page->itdba_gpa = gpa;
scb_s->itdba = hpa;
}

@@ -593,6 +597,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
rc = set_validity_icpt(scb_s, 0x1310U);
goto unpin;
}
vsie_page->gvrd_gpa = gpa;
scb_s->gvrd = hpa;
}

@@ -609,6 +614,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
goto unpin;
}
/* Validity 0x0044 will be checked by SIE */
vsie_page->riccbd_gpa = gpa;
scb_s->riccbd = hpa;
}
if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
@@ -636,6 +642,7 @@ static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
rc = set_validity_icpt(scb_s, 0x10b0U);
goto unpin;
}
vsie_page->sdnx_gpa = gpa;
scb_s->sdnxo = hpa | sdnxc;
}
return 0;

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