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[SRU,F,2/4] s390/kvm: diagnose 0x318 sync and reset

Message ID 20211207203850.3212728-3-frank.heimes@canonical.com
State New
Headers show
Series [SRU,F,1/4] s390/setup: diag 318: refactor struct | expand

Commit Message

Frank Heimes Dec. 7, 2021, 8:38 p.m. UTC 
From: Collin Walling <walling@linux.ibm.com>

BugLink: https://bugs.launchpad.net/bugs/1953334

DIAGNOSE 0x318 (diag318) sets information regarding the environment
the VM is running in (Linux, z/VM, etc) and is observed via
firmware/service events.

This is a privileged s390x instruction that must be intercepted by
SIE. Userspace handles the instruction as well as migration. Data
is communicated via VCPU register synchronization.

The Control Program Name Code (CPNC) is stored in the SIE block. The
CPNC along with the Control Program Version Code (CPVC) are stored
in the kvm_vcpu_arch struct.

This data is reset on load normal and clear resets.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/r/20200622154636.5499-3-walling@linux.ibm.com
[borntraeger@de.ibm.com: fix sync_reg position]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
(backported from commit 23a60f834406c8e3805328b630d09d5546b460c1)
Signed-off-by: Frank Heimes <frank.heimes@canonical.com>
---
 arch/s390/include/asm/kvm_host.h |  4 +++-
 arch/s390/include/uapi/asm/kvm.h |  7 +++++--
 arch/s390/kvm/kvm-s390.c         | 11 ++++++++++-
 arch/s390/kvm/vsie.c             |  1 +
 include/uapi/linux/kvm.h         |  1 +
 5 files changed, 20 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 03be757cc2a5..5802dab2e8a1 100644
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -260,7 +260,8 @@  struct kvm_s390_sie_block {
 	__u32	scaol;			/* 0x0064 */
 	__u8	sdf;			/* 0x0068 */
 	__u8    epdx;			/* 0x0069 */
-	__u8    reserved6a[2];		/* 0x006a */
+	__u8	cpnc;			/* 0x006a */
+	__u8	reserved6b;		/* 0x006b */
 	__u32	todpr;			/* 0x006c */
 #define GISA_FORMAT1 0x00000001
 	__u32	gd;			/* 0x0070 */
@@ -742,6 +743,7 @@  struct kvm_vcpu_arch {
 	bool gs_enabled;
 	bool skey_enabled;
 	struct kvm_s390_pv_vcpu pv;
+	union diag318_info diag318_info;
 };
 
 struct kvm_vm_stat {
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
index 436ec7636927..7a6b14874d65 100644
--- a/arch/s390/include/uapi/asm/kvm.h
+++ b/arch/s390/include/uapi/asm/kvm.h
@@ -231,11 +231,13 @@  struct kvm_guest_debug_arch {
 #define KVM_SYNC_GSCB   (1UL << 9)
 #define KVM_SYNC_BPBC   (1UL << 10)
 #define KVM_SYNC_ETOKEN (1UL << 11)
+#define KVM_SYNC_DIAG318 (1UL << 12)
 
 #define KVM_SYNC_S390_VALID_FIELDS \
 	(KVM_SYNC_PREFIX | KVM_SYNC_GPRS | KVM_SYNC_ACRS | KVM_SYNC_CRS | \
 	 KVM_SYNC_ARCH0 | KVM_SYNC_PFAULT | KVM_SYNC_VRS | KVM_SYNC_RICCB | \
-	 KVM_SYNC_FPRS | KVM_SYNC_GSCB | KVM_SYNC_BPBC | KVM_SYNC_ETOKEN)
+	 KVM_SYNC_FPRS | KVM_SYNC_GSCB | KVM_SYNC_BPBC | KVM_SYNC_ETOKEN | \
+	 KVM_SYNC_DIAG318)
 
 /* length and alignment of the sdnx as a power of two */
 #define SDNXC 8
@@ -264,7 +266,8 @@  struct kvm_sync_regs {
 	__u8 reserved2 : 7;
 	__u8 padding1[51];	/* riccb needs to be 64byte aligned */
 	__u8 riccb[64];		/* runtime instrumentation controls block */
-	__u8 padding2[192];	/* sdnx needs to be 256byte aligned */
+	__u64 diag318;		/* diagnose 0x318 info */
+	__u8 padding2[184];	/* sdnx needs to be 256byte aligned */
 	union {
 		__u8 sdnx[SDNXL];  /* state description annex */
 		struct {
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 908ce7b1d756..a8adbe7ffc89 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -539,6 +539,7 @@  int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 	case KVM_CAP_S390_AIS:
 	case KVM_CAP_S390_AIS_MIGRATION:
 	case KVM_CAP_S390_VCPU_RESETS:
+	case KVM_CAP_S390_DIAG318:
 		r = 1;
 		break;
 	case KVM_CAP_S390_HPAGE_1M:
@@ -2961,7 +2962,8 @@  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 				    KVM_SYNC_ACRS |
 				    KVM_SYNC_CRS |
 				    KVM_SYNC_ARCH0 |
-				    KVM_SYNC_PFAULT;
+				    KVM_SYNC_PFAULT |
+				    KVM_SYNC_DIAG318;
 	kvm_s390_set_prefix(vcpu, 0);
 	if (test_kvm_facility(vcpu->kvm, 64))
 		vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
@@ -3554,6 +3556,7 @@  static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
 		vcpu->arch.sie_block->pp = 0;
 		vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
 		vcpu->arch.sie_block->todpr = 0;
+		vcpu->arch.sie_block->cpnc = 0;
 	}
 }
 
@@ -3571,6 +3574,7 @@  static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
 
 	regs->etoken = 0;
 	regs->etoken_extension = 0;
+	regs->diag318 = 0;
 }
 
 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
@@ -4189,6 +4193,10 @@  static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 		if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
 			kvm_clear_async_pf_completion_queue(vcpu);
 	}
+	if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
+		vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
+		vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
+	}
 	/*
 	 * If userspace sets the riccb (e.g. after migration) to a valid state,
 	 * we should enable RI here instead of doing the lazy enablement.
@@ -4290,6 +4298,7 @@  static void store_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
 	kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
 	kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
+	kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
 	if (MACHINE_HAS_GS) {
 		preempt_disable();
 		__ctl_set_bit(2, 4);
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 4f6c22d72072..6528716fbd51 100644
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -548,6 +548,7 @@  static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
 		scb_s->ecd |= scb_o->ecd & ECD_ETOKENF;
 
 	scb_s->hpid = HPID_VSIE;
+	scb_s->cpnc = scb_o->cpnc;
 
 	prepare_ibc(vcpu, vsie_page);
 	rc = shadow_crycb(vcpu, vsie_page);
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 743d34da37dd..460ad2a34b56 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -1010,6 +1010,7 @@  struct kvm_ppc_resize_hpt {
 #define KVM_CAP_HYPERV_DIRECT_TLBFLUSH 175
 #define KVM_CAP_S390_VCPU_RESETS 179
 #define KVM_CAP_S390_PROTECTED 180
+#define KVM_CAP_S390_DIAG318 186
 
 #ifdef KVM_CAP_IRQ_ROUTING