From: Michael Mueller Date: Tue, 17 Sep 2024 15:18:34 +0000 (+0200) Subject: KVM: s390: Change virtual to physical address access in diag 0x258 handler X-Git-Tag: v6.12-rc4~30^2~5 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cad4b3d4ab1f062708fff33f44d246853f51e966;p=thirdparty%2Fkernel%2Flinux.git KVM: s390: Change virtual to physical address access in diag 0x258 handler The parameters for the diag 0x258 are real addresses, not virtual, but KVM was using them as virtual addresses. This only happened to work, since the Linux kernel as a guest used to have a 1:1 mapping for physical vs virtual addresses. Fix KVM so that it correctly uses the addresses as real addresses. Cc: stable@vger.kernel.org Fixes: 8ae04b8f500b ("KVM: s390: Guest's memory access functions get access registers") Suggested-by: Vasily Gorbik Signed-off-by: Michael Mueller Signed-off-by: Nico Boehr Reviewed-by: Christian Borntraeger Reviewed-by: Heiko Carstens Link: https://lore.kernel.org/r/20240917151904.74314-3-nrb@linux.ibm.com Acked-by: Janosch Frank Signed-off-by: Heiko Carstens --- diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index 2a32438e09ceb..74f73141f9b96 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -77,7 +77,7 @@ static int __diag_page_ref_service(struct kvm_vcpu *vcpu) vcpu->stat.instruction_diagnose_258++; if (vcpu->run->s.regs.gprs[rx] & 7) return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION); - rc = read_guest(vcpu, vcpu->run->s.regs.gprs[rx], rx, &parm, sizeof(parm)); + rc = read_guest_real(vcpu, vcpu->run->s.regs.gprs[rx], &parm, sizeof(parm)); if (rc) return kvm_s390_inject_prog_cond(vcpu, rc); if (parm.parm_version != 2 || parm.parm_len < 5 || parm.code != 0x258)