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KVM: s390: set host program identifier

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A host program identifier (HPID) provides information regarding the
underlying host environment. A level-2 (VM) guest will have an HPID
denoting Linux/KVM, which is set during VCPU setup. A level-3 (VM on a
VM) and beyond guest will have an HPID denoting KVM vSIE, which is set
for all shadow control blocks, overriding the original value of the
HPID.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Message-Id: <1535734279-10204-4-git-send-email-walling@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Collin Walling 2018-08-31 12:51:19 -04:00 committed by Christian Borntraeger
parent 7876320f88
commit 67d49d52ae
3 changed files with 9 additions and 1 deletions
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6
arch/s390/include/asm/kvm_host.h
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@ -237,7 +237,11 @@ struct kvm_s390_sie_block {
psw_t gpsw; /* 0x0090 */
__u64 gg14; /* 0x00a0 */
__u64 gg15; /* 0x00a8 */
__u8 reservedb0[20]; /* 0x00b0 */
__u8 reservedb0[8]; /* 0x00b0 */
#define HPID_KVM 0x4
#define HPID_VSIE 0x5
__u8 hpid; /* 0x00b8 */
__u8 reservedb9[11]; /* 0x00b9 */
__u16 extcpuaddr; /* 0x00c4 */
__u16 eic; /* 0x00c6 */
__u32 reservedc8; /* 0x00c8 */

2
arch/s390/kvm/kvm-s390.c
View File

@ -2685,6 +2685,8 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
vcpu->arch.ckc_timer.function = kvm_s390_idle_wakeup;
vcpu->arch.sie_block->hpid = HPID_KVM;
kvm_s390_vcpu_crypto_setup(vcpu);
return rc;

2
arch/s390/kvm/vsie.c
View File

@ -383,6 +383,8 @@ static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
if (test_kvm_facility(vcpu->kvm, 156))
scb_s->ecd |= scb_o->ecd & ECD_ETOKENF;
scb_s->hpid = HPID_VSIE;
prepare_ibc(vcpu, vsie_page);
rc = shadow_crycb(vcpu, vsie_page);
out: