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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/arch/s390/kvm/intercept.c
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@@ -2,7 +2,7 @@
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 /*
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  * in-kernel handling for sie intercepts
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  *
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- * Copyright IBM Corp. 2008, 2014
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+ * Copyright IBM Corp. 2008, 2020
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  *
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  *    Author(s): Carsten Otte <cotte@de.ibm.com>
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  *               Christian Borntraeger <borntraeger@de.ibm.com>
..
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@@ -12,10 +12,10 @@
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 #include <linux/errno.h>
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 #include <linux/pagemap.h>
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14
 
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-#include <asm/kvm_host.h>
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 #include <asm/asm-offsets.h>
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 #include <asm/irq.h>
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 #include <asm/sysinfo.h>
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+#include <asm/uv.h>
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 #include "kvm-s390.h"
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 #include "gaccess.h"
..
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@@ -79,6 +79,10 @@
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 			return rc;
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 	}
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+	/*
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+	 * no need to check the return value of vcpu_stop as it can only have
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+	 * an error for protvirt, but protvirt means user cpu state
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+	 */
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 	if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
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 		kvm_s390_vcpu_stop(vcpu);
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 	return -EOPNOTSUPP;
..
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@@ -230,6 +234,13 @@
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 	int rc;
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235
 
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 	vcpu->stat.exit_program_interruption++;
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+
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+	/*
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+	 * Intercept 8 indicates a loop of specification exceptions
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+	 * for protected guests.
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+	 */
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+	if (kvm_s390_pv_cpu_is_protected(vcpu))
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+		return -EOPNOTSUPP;
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244
 
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 	if (guestdbg_enabled(vcpu) && per_event(vcpu)) {
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 		rc = kvm_s390_handle_per_event(vcpu);
..
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@@ -384,7 +395,7 @@
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 		goto out;
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 	}
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-	if (addr & ~PAGE_MASK)
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+	if (!kvm_s390_pv_cpu_is_protected(vcpu) && (addr & ~PAGE_MASK))
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 		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
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400
 
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 	sctns = (void *)get_zeroed_page(GFP_KERNEL);
..
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@@ -395,10 +406,15 @@
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406
 
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 out:
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 	if (!cc) {
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-		r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
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-		if (r) {
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-			free_page((unsigned long)sctns);
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-			return kvm_s390_inject_prog_cond(vcpu, r);
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+		if (kvm_s390_pv_cpu_is_protected(vcpu)) {
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+			memcpy((void *)(sida_origin(vcpu->arch.sie_block)),
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+			       sctns, PAGE_SIZE);
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+		} else {
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+			r = write_guest(vcpu, addr, reg2, sctns, PAGE_SIZE);
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+			if (r) {
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+				free_page((unsigned long)sctns);
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+				return kvm_s390_inject_prog_cond(vcpu, r);
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+			}
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 		}
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 	}
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..
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@@ -444,6 +460,92 @@
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 	return kvm_s390_inject_program_int(vcpu, PGM_OPERATION);
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 }
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462
 
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+static int handle_pv_spx(struct kvm_vcpu *vcpu)
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+{
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+	u32 pref = *(u32 *)vcpu->arch.sie_block->sidad;
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+
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+	kvm_s390_set_prefix(vcpu, pref);
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+	trace_kvm_s390_handle_prefix(vcpu, 1, pref);
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+	return 0;
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+}
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+
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+static int handle_pv_sclp(struct kvm_vcpu *vcpu)
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+{
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+	struct kvm_s390_float_interrupt *fi = &vcpu->kvm->arch.float_int;
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+
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+	spin_lock(&fi->lock);
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+	/*
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+	 * 2 cases:
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+	 * a: an sccb answering interrupt was already pending or in flight.
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+	 *    As the sccb value is not known we can simply set some value to
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+	 *    trigger delivery of a saved SCCB. UV will then use its saved
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+	 *    copy of the SCCB value.
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+	 * b: an error SCCB interrupt needs to be injected so we also inject
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+	 *    a fake SCCB address. Firmware will use the proper one.
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+	 * This makes sure, that both errors and real sccb returns will only
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+	 * be delivered after a notification intercept (instruction has
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+	 * finished) but not after others.
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+	 */
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+	fi->srv_signal.ext_params |= 0x43000;
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+	set_bit(IRQ_PEND_EXT_SERVICE, &fi->pending_irqs);
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+	clear_bit(IRQ_PEND_EXT_SERVICE, &fi->masked_irqs);
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+	spin_unlock(&fi->lock);
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+	return 0;
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+}
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+
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+static int handle_pv_uvc(struct kvm_vcpu *vcpu)
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+{
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+	struct uv_cb_share *guest_uvcb = (void *)vcpu->arch.sie_block->sidad;
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+	struct uv_cb_cts uvcb = {
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+		.header.cmd	= UVC_CMD_UNPIN_PAGE_SHARED,
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+		.header.len	= sizeof(uvcb),
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+		.guest_handle	= kvm_s390_pv_get_handle(vcpu->kvm),
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+		.gaddr		= guest_uvcb->paddr,
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+	};
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+	int rc;
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+
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+	if (guest_uvcb->header.cmd != UVC_CMD_REMOVE_SHARED_ACCESS) {
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+		WARN_ONCE(1, "Unexpected notification intercept for UVC 0x%x\n",
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+			  guest_uvcb->header.cmd);
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+		return 0;
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+	}
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+	rc = gmap_make_secure(vcpu->arch.gmap, uvcb.gaddr, &uvcb);
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+	/*
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+	 * If the unpin did not succeed, the guest will exit again for the UVC
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+	 * and we will retry the unpin.
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+	 */
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+	if (rc == -EINVAL)
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+		return 0;
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+	return rc;
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+}
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+
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+static int handle_pv_notification(struct kvm_vcpu *vcpu)
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+{
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+	int ret;
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+
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+	if (vcpu->arch.sie_block->ipa == 0xb210)
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+		return handle_pv_spx(vcpu);
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+	if (vcpu->arch.sie_block->ipa == 0xb220)
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+		return handle_pv_sclp(vcpu);
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+	if (vcpu->arch.sie_block->ipa == 0xb9a4)
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+		return handle_pv_uvc(vcpu);
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+	if (vcpu->arch.sie_block->ipa >> 8 == 0xae) {
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+		/*
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+		 * Besides external call, other SIGP orders also cause a
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+		 * 108 (pv notify) intercept. In contrast to external call,
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+		 * these orders need to be emulated and hence the appropriate
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+		 * place to handle them is in handle_instruction().
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+		 * So first try kvm_s390_handle_sigp_pei() and if that isn't
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+		 * successful, go on with handle_instruction().
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+		 */
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+		ret = kvm_s390_handle_sigp_pei(vcpu);
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+		if (!ret)
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+			return ret;
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+	}
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+
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+	return handle_instruction(vcpu);
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+}
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+
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 int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
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 {
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 	int rc, per_rc = 0;
..
..
@@ -480,6 +582,28 @@
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 	case ICPT_KSS:
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583
 		rc = kvm_s390_skey_check_enable(vcpu);
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584
 		break;
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+	case ICPT_MCHKREQ:
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+	case ICPT_INT_ENABLE:
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+		/*
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+		 * PSW bit 13 or a CR (0, 6, 14) changed and we might
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+		 * now be able to deliver interrupts. The pre-run code
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+		 * will take care of this.
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+		 */
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+		rc = 0;
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+		break;
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+	case ICPT_PV_INSTR:
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+		rc = handle_instruction(vcpu);
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+		break;
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+	case ICPT_PV_NOTIFY:
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+		rc = handle_pv_notification(vcpu);
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+		break;
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+	case ICPT_PV_PREF:
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+		rc = 0;
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+		gmap_convert_to_secure(vcpu->arch.gmap,
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+				       kvm_s390_get_prefix(vcpu));
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+		gmap_convert_to_secure(vcpu->arch.gmap,
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+				       kvm_s390_get_prefix(vcpu) + PAGE_SIZE);
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+		break;
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 	default:
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 		return -EOPNOTSUPP;
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 	}