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KVM: s390: use switch vs jump table in priv.c 

Instead of having huge jump tables for function selection,
let's use normal switch/case statements for the instruction
handlers in priv.c

This allows the compiler to make the right decision depending
on the situation (e.g. avoid jump-tables for thunks).

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2016-04-08 17:52:39 +02:00
parent f315104ad8
commit 6db4263fec
1 changed files with 91 additions and 92 deletions
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183
arch/s390/kvm/priv.c
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@ -795,55 +795,60 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
return rc;
}
static const intercept_handler_t b2_handlers[256] = {
[0x02] = handle_stidp,
[0x04] = handle_set_clock,
[0x10] = handle_set_prefix,
[0x11] = handle_store_prefix,
[0x12] = handle_store_cpu_address,
[0x14] = kvm_s390_handle_vsie,
[0x21] = handle_ipte_interlock,
[0x29] = handle_iske,
[0x2a] = handle_rrbe,
[0x2b] = handle_sske,
[0x2c] = handle_test_block,
[0x30] = handle_io_inst,
[0x31] = handle_io_inst,
[0x32] = handle_io_inst,
[0x33] = handle_io_inst,
[0x34] = handle_io_inst,
[0x35] = handle_io_inst,
[0x36] = handle_io_inst,
[0x37] = handle_io_inst,
[0x38] = handle_io_inst,
[0x39] = handle_io_inst,
[0x3a] = handle_io_inst,
[0x3b] = handle_io_inst,
[0x3c] = handle_io_inst,
[0x50] = handle_ipte_interlock,
[0x56] = handle_sthyi,
[0x5f] = handle_io_inst,
[0x74] = handle_io_inst,
[0x76] = handle_io_inst,
[0x7d] = handle_stsi,
[0xb1] = handle_stfl,
[0xb2] = handle_lpswe,
};
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
{
intercept_handler_t handler;
/*
* A lot of B2 instructions are priviledged. Here we check for
* the privileged ones, that we can handle in the kernel.
* Anything else goes to userspace.
*/
handler = b2_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
if (handler)
return handler(vcpu);
return -EOPNOTSUPP;
switch (vcpu->arch.sie_block->ipa & 0x00ff) {
case 0x02:
return handle_stidp(vcpu);
case 0x04:
return handle_set_clock(vcpu);
case 0x10:
return handle_set_prefix(vcpu);
case 0x11:
return handle_store_prefix(vcpu);
case 0x12:
return handle_store_cpu_address(vcpu);
case 0x14:
return kvm_s390_handle_vsie(vcpu);
case 0x21:
case 0x50:
return handle_ipte_interlock(vcpu);
case 0x29:
return handle_iske(vcpu);
case 0x2a:
return handle_rrbe(vcpu);
case 0x2b:
return handle_sske(vcpu);
case 0x2c:
return handle_test_block(vcpu);
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
case 0x3a:
case 0x3b:
case 0x3c:
case 0x5f:
case 0x74:
case 0x76:
return handle_io_inst(vcpu);
case 0x56:
return handle_sthyi(vcpu);
case 0x7d:
return handle_stsi(vcpu);
case 0xb1:
return handle_stfl(vcpu);
case 0xb2:
return handle_lpswe(vcpu);
default:
return -EOPNOTSUPP;
}
}
static int handle_epsw(struct kvm_vcpu *vcpu)
@ -1105,25 +1110,22 @@ static int handle_essa(struct kvm_vcpu *vcpu)
return 0;
}
static const intercept_handler_t b9_handlers[256] = {
[0x8a] = handle_ipte_interlock,
[0x8d] = handle_epsw,
[0x8e] = handle_ipte_interlock,
[0x8f] = handle_ipte_interlock,
[0xab] = handle_essa,
[0xaf] = handle_pfmf,
};
int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
{
intercept_handler_t handler;
/* This is handled just as for the B2 instructions. */
handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
if (handler)
return handler(vcpu);
return -EOPNOTSUPP;
switch (vcpu->arch.sie_block->ipa & 0x00ff) {
case 0x8a:
case 0x8e:
case 0x8f:
return handle_ipte_interlock(vcpu);
case 0x8d:
return handle_epsw(vcpu);
case 0xab:
return handle_essa(vcpu);
case 0xaf:
return handle_pfmf(vcpu);
default:
return -EOPNOTSUPP;
}
}
int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
@ -1271,22 +1273,20 @@ static int handle_stctg(struct kvm_vcpu *vcpu)
return rc ? kvm_s390_inject_prog_cond(vcpu, rc) : 0;
}
static const intercept_handler_t eb_handlers[256] = {
[0x2f] = handle_lctlg,
[0x25] = handle_stctg,
[0x60] = handle_ri,
[0x61] = handle_ri,
[0x62] = handle_ri,
};
int kvm_s390_handle_eb(struct kvm_vcpu *vcpu)
{
intercept_handler_t handler;
handler = eb_handlers[vcpu->arch.sie_block->ipb & 0xff];
if (handler)
return handler(vcpu);
return -EOPNOTSUPP;
switch (vcpu->arch.sie_block->ipb & 0x000000ff) {
case 0x25:
return handle_stctg(vcpu);
case 0x2f:
return handle_lctlg(vcpu);
case 0x60:
case 0x61:
case 0x62:
return handle_ri(vcpu);
default:
return -EOPNOTSUPP;
}
}
static int handle_tprot(struct kvm_vcpu *vcpu)
@ -1346,10 +1346,12 @@ static int handle_tprot(struct kvm_vcpu *vcpu)
int kvm_s390_handle_e5(struct kvm_vcpu *vcpu)
{
/* For e5xx... instructions we only handle TPROT */
if ((vcpu->arch.sie_block->ipa & 0x00ff) == 0x01)
switch (vcpu->arch.sie_block->ipa & 0x00ff) {
case 0x01:
return handle_tprot(vcpu);
return -EOPNOTSUPP;
default:
return -EOPNOTSUPP;
}
}
static int handle_sckpf(struct kvm_vcpu *vcpu)
@ -1380,17 +1382,14 @@ static int handle_ptff(struct kvm_vcpu *vcpu)
return 0;
}
static const intercept_handler_t x01_handlers[256] = {
[0x04] = handle_ptff,
[0x07] = handle_sckpf,
};
int kvm_s390_handle_01(struct kvm_vcpu *vcpu)
{
intercept_handler_t handler;
handler = x01_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
if (handler)
return handler(vcpu);
return -EOPNOTSUPP;
switch (vcpu->arch.sie_block->ipa & 0x00ff) {
case 0x04:
return handle_ptff(vcpu);
case 0x07:
return handle_sckpf(vcpu);
default:
return -EOPNOTSUPP;
}
}