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target/s390x: kvm: Honor storage keys during emulation 

Storage key controlled protection is currently not honored when
emulating instructions.
If available, enable key protection for the MEM_OP ioctl, thereby
enabling it for the s390_cpu_virt_mem_* functions, when using kvm.
As a result, the emulation of the following instructions honors storage
keys:

* CLP
  	The Synch I/O CLP command would need special handling in order
  	to support storage keys, but is currently not supported.
* CHSC
	Performing commands asynchronously would require special
	handling, but commands are currently always synchronous.
* STSI
* TSCH
	Must (and does) not change channel if terminated due to
	protection.
* MSCH
	Suppressed on protection, works because fetching instruction.
* SSCH
	Suppressed on protection, works because fetching instruction.
* STSCH
* STCRW
	Suppressed on protection, this works because no partial store is
	possible, because the operand cannot span multiple pages.
* PCISTB
* MPCIFC
* STPCIFC

Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Message-Id: <20220506153956.2217601-3-scgl@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Janis Schoetterl-Glausch 2022-05-06 17:39:56 +02:00 committed by Thomas Huth
parent ec8c293678
commit 54354861d2
1 changed files with 9 additions and 0 deletions
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9
target/s390x/kvm/kvm.c
View File

@ -151,12 +151,15 @@ const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
static int cap_sync_regs;
static int cap_async_pf;
static int cap_mem_op;
static int cap_mem_op_extension;
static int cap_s390_irq;
static int cap_ri;
static int cap_hpage_1m;
static int cap_vcpu_resets;
static int cap_protected;
static bool mem_op_storage_key_support;
static int active_cmma;
static int kvm_s390_query_mem_limit(uint64_t *memory_limit)
@ -354,6 +357,8 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
cap_async_pf = kvm_check_extension(s, KVM_CAP_ASYNC_PF);
cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP);
cap_mem_op_extension = kvm_check_extension(s, KVM_CAP_S390_MEM_OP_EXTENSION);
mem_op_storage_key_support = cap_mem_op_extension > 0;
cap_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ);
cap_vcpu_resets = kvm_check_extension(s, KVM_CAP_S390_VCPU_RESETS);
cap_protected = kvm_check_extension(s, KVM_CAP_S390_PROTECTED);
@ -842,6 +847,7 @@ int kvm_s390_mem_op(S390CPU *cpu, vaddr addr, uint8_t ar, void *hostbuf,
: KVM_S390_MEMOP_LOGICAL_READ,
.buf = (uint64_t)hostbuf,
.ar = ar,
.key = (cpu->env.psw.mask & PSW_MASK_KEY) >> PSW_SHIFT_KEY,
};
int ret;
@ -851,6 +857,9 @@ int kvm_s390_mem_op(S390CPU *cpu, vaddr addr, uint8_t ar, void *hostbuf,
if (!hostbuf) {
mem_op.flags |= KVM_S390_MEMOP_F_CHECK_ONLY;
}
if (mem_op_storage_key_support) {
mem_op.flags |= KVM_S390_MEMOP_F_SKEY_PROTECTION;
}
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_S390_MEM_OP, &mem_op);
if (ret < 0) {