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KVM: s390/CPACF: Choose crypto control block format

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We need to specify a different format for the crypto control block
depending on whether the APXA facility is installed or not. Let's
test for it by executing the PQAP(QCI) function and use either a
format-1 or a format-2 crypto control block accordingly. This is a
host only change for z13 and does not affect the guest view.

Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Tony Krowiak 2015-01-13 11:33:26 -05:00 committed by Christian Borntraeger
parent f3d0bd6c7f
commit 45c9b47c58
2 changed files with 49 additions and 2 deletions
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2
arch/s390/include/asm/kvm_host.h
View file

@ -163,6 +163,7 @@ struct kvm_s390_sie_block {
__u64 tecmc; /* 0x00e8 */
__u8 reservedf0[12]; /* 0x00f0 */
#define CRYCB_FORMAT1 0x00000001
#define CRYCB_FORMAT2 0x00000003
__u32 crycbd; /* 0x00fc */
__u64 gcr[16]; /* 0x0100 */
__u64 gbea; /* 0x0180 */
@ -516,6 +517,7 @@ struct kvm_s390_crypto_cb {
__u8 reserved00[72]; /* 0x0000 */
__u8 dea_wrapping_key_mask[24]; /* 0x0048 */
__u8 aes_wrapping_key_mask[32]; /* 0x0060 */
__u8 reserved80[128]; /* 0x0080 */
};
struct kvm_arch{

49
arch/s390/kvm/kvm-s390.c
View file

@ -654,6 +654,52 @@ long kvm_arch_vm_ioctl(struct file *filp,
return r;
}
static int kvm_s390_query_ap_config(u8 *config)
{
u32 fcn_code = 0x04000000UL;
u32 cc;
asm volatile(
"lgr 0,%1\n"
"lgr 2,%2\n"
".long 0xb2af0000\n" /* PQAP(QCI) */
"ipm %0\n"
"srl %0,28\n"
: "=r" (cc)
: "r" (fcn_code), "r" (config)
: "cc", "0", "2", "memory"
);
return cc;
}
static int kvm_s390_apxa_installed(void)
{
u8 config[128];
int cc;
if (test_facility(2) && test_facility(12)) {
cc = kvm_s390_query_ap_config(config);
if (cc)
pr_err("PQAP(QCI) failed with cc=%d", cc);
else
return config[0] & 0x40;
}
return 0;
}
static void kvm_s390_set_crycb_format(struct kvm *kvm)
{
kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
if (kvm_s390_apxa_installed())
kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
else
kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
}
static int kvm_s390_crypto_init(struct kvm *kvm)
{
if (!test_vfacility(76))
@ -664,8 +710,7 @@ static int kvm_s390_crypto_init(struct kvm *kvm)
if (!kvm->arch.crypto.crycb)
return -ENOMEM;
kvm->arch.crypto.crycbd = (__u32) (unsigned long) kvm->arch.crypto.crycb |
CRYCB_FORMAT1;
kvm_s390_set_crycb_format(kvm);
/* Disable AES/DEA protected key functions by default */
kvm->arch.crypto.aes_kw = 0;