linux-kernel - [PATCH 5.10 088/530] KVM: s390: VSIE: fix MVPG handling for prefixing and MSO

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Message-Id: <20210512144822.685236817@linuxfoundation.org>
Date:   Wed, 12 May 2021 16:43:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Janosch Frank <frankja@...ux.ibm.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH 5.10 088/530] KVM: s390: VSIE: fix MVPG handling for prefixing and MSO

From: Claudio Imbrenda <imbrenda@...ux.ibm.com>

commit c3171e94cc1cdcc3229565244112e869f052b8d9 upstream.

Prefixing needs to be applied to the guest real address to translate it
into a guest absolute address.

The value of MSO needs to be added to a guest-absolute address in order to
obtain the host-virtual.

Fixes: bdf7509bbefa ("s390/kvm: VSIE: correctly handle MVPG when in VSIE")
Reported-by: Janosch Frank <frankja@...ux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Reviewed-by: David Hildenbrand <david@...hat.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210322140559.500716-3-imbrenda@linux.ibm.com
[borntraeger@...ibm.com simplify mso]
Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/s390/kvm/vsie.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -1001,7 +1001,7 @@ static u64 vsie_get_register(struct kvm_
 static int vsie_handle_mvpg(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 {
 	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
-	unsigned long pei_dest, pei_src, src, dest, mask;
+	unsigned long pei_dest, pei_src, src, dest, mask, prefix;
 	u64 *pei_block = &vsie_page->scb_o->mcic;
 	int edat, rc_dest, rc_src;
 	union ctlreg0 cr0;
@@ -1009,9 +1009,12 @@ static int vsie_handle_mvpg(struct kvm_v
 	cr0.val = vcpu->arch.sie_block->gcr[0];
 	edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8);
 	mask = _kvm_s390_logical_to_effective(&scb_s->gpsw, PAGE_MASK);
+	prefix = scb_s->prefix << GUEST_PREFIX_SHIFT;
 
 	dest = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 20) & mask;
+	dest = _kvm_s390_real_to_abs(prefix, dest) + scb_s->mso;
 	src = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 16) & mask;
+	src = _kvm_s390_real_to_abs(prefix, src) + scb_s->mso;
 
 	rc_dest = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, dest, &pei_dest);
 	rc_src = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, src, &pei_src);