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From 27c1d979a994f5afc59c3520af58d15aa5aae723 Mon Sep 17 00:00:00 2001
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From: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
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Date: Fri, 6 May 2022 17:39:56 +0200
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Subject: [PATCH 29/32] target/s390x: kvm: Honor storage keys during emulation
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RH-Author: Thomas Huth <thuth@redhat.com>
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RH-MergeRequest: 109: Honor storage keys during emulation of I/O instructions
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RH-Commit: [2/2] 346dee1e13bfe1c074e4c6a4417091711d852f9c (thuth/qemu-kvm-cs9)
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RH-Bugzilla: 2111994
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Acked-by: Claudio Imbrenda <None>
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Storage key controlled protection is currently not honored when
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emulating instructions.
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If available, enable key protection for the MEM_OP ioctl, thereby
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enabling it for the s390_cpu_virt_mem_* functions, when using kvm.
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As a result, the emulation of the following instructions honors storage
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keys:
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* CLP
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The Synch I/O CLP command would need special handling in order
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to support storage keys, but is currently not supported.
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* CHSC
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Performing commands asynchronously would require special
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handling, but commands are currently always synchronous.
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* STSI
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* TSCH
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Must (and does) not change channel if terminated due to
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protection.
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* MSCH
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Suppressed on protection, works because fetching instruction.
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* SSCH
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Suppressed on protection, works because fetching instruction.
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* STSCH
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* STCRW
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Suppressed on protection, this works because no partial store is
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possible, because the operand cannot span multiple pages.
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* PCISTB
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* MPCIFC
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* STPCIFC
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Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
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Message-Id: <20220506153956.2217601-3-scgl@linux.ibm.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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(cherry picked from commit 54354861d21b69ec0781f43e67b8d4f6edad7e3f)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2111994
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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---
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target/s390x/kvm/kvm.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
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index 74f089d87f..1f1d1a33b8 100644
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--- a/target/s390x/kvm/kvm.c
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+++ b/target/s390x/kvm/kvm.c
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@@ -152,12 +152,15 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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static int cap_sync_regs;
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static int cap_async_pf;
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static int cap_mem_op;
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+static int cap_mem_op_extension;
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static int cap_s390_irq;
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static int cap_ri;
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static int cap_hpage_1m;
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static int cap_vcpu_resets;
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static int cap_protected;
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+static bool mem_op_storage_key_support;
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+
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static int active_cmma;
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static int kvm_s390_query_mem_limit(uint64_t *memory_limit)
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@@ -355,6 +358,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
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cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
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cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP);
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+ cap_mem_op_extension = kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EXTENSION);
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+ mem_op_storage_key_support = cap_mem_op_extension > 0;
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cap_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);
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cap_vcpu_resets = kvm_check_extension(s, KVM_CAP_S390_VCPU_RESETS);
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cap_protected = kvm_check_extension(s, KVM_CAP_S390_PROTECTED);
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@@ -843,6 +848,7 @@ int kvm_s390_mem_op(S390CPU *cpu, vaddr addr, uint8_t ar, void *hostbuf,
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: KVM_S390_MEMOP_LOGICAL_READ,
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.buf = (uint64_t)hostbuf,
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.ar = ar,
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+ .key = (cpu->env.psw.mask & PSW_MASK_KEY) >> PSW_SHIFT_KEY,
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};
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int ret;
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@@ -852,6 +858,9 @@ int kvm_s390_mem_op(S390CPU *cpu, vaddr addr, uint8_t ar, void *hostbuf,
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if (!hostbuf) {
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mem_op.flags |= KVM_S390_MEMOP_F_CHECK_ONLY;
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}
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+ if (mem_op_storage_key_support) {
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+ mem_op.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
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+ }
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ret = kvm_vcpu_ioctl(CPU(cpu), KVM_S390_MEM_OP, &mem_op);
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if (ret < 0) {
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--
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2.31.1
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