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authorThomas Huth <thuth@linux.vnet.ibm.com>2014-02-03 10:42:30 +0100
committerChristian Borntraeger <borntraeger@de.ibm.com>2014-04-29 15:01:51 +0200
commit9a558ee3ccb8afcf43c8d9d4d206ab6de4aa30a2 (patch)
tree3abc6630eafe057d5bea90aab4edf2025424c571 /arch/s390
parent198c74f43f0f5473f99967aead30ddc622804bc1 (diff)
downloadop-kernel-dev-9a558ee3ccb8afcf43c8d9d4d206ab6de4aa30a2.zip
op-kernel-dev-9a558ee3ccb8afcf43c8d9d4d206ab6de4aa30a2.tar.gz
KVM: s390: Handle MVPG partial execution interception
When the guest executes the MVPG instruction with DAT disabled, and the source or destination page is not mapped in the host, the so-called partial execution interception occurs. We need to handle this event by setting up a mapping for the corresponding user pages. Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/kvm/intercept.c55
1 files changed, 54 insertions, 1 deletions
diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
index 30e1c5e..54313fe 100644
--- a/arch/s390/kvm/intercept.c
+++ b/arch/s390/kvm/intercept.c
@@ -1,7 +1,7 @@
/*
* in-kernel handling for sie intercepts
*
- * Copyright IBM Corp. 2008, 2009
+ * Copyright IBM Corp. 2008, 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
@@ -234,6 +234,58 @@ static int handle_instruction_and_prog(struct kvm_vcpu *vcpu)
return rc2;
}
+/**
+ * Handle MOVE PAGE partial execution interception.
+ *
+ * This interception can only happen for guests with DAT disabled and
+ * addresses that are currently not mapped in the host. Thus we try to
+ * set up the mappings for the corresponding user pages here (or throw
+ * addressing exceptions in case of illegal guest addresses).
+ */
+static int handle_mvpg_pei(struct kvm_vcpu *vcpu)
+{
+ unsigned long hostaddr, srcaddr, dstaddr;
+ psw_t *psw = &vcpu->arch.sie_block->gpsw;
+ struct mm_struct *mm = current->mm;
+ int reg1, reg2, rc;
+
+ kvm_s390_get_regs_rre(vcpu, &reg1, &reg2);
+ srcaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg2]);
+ dstaddr = kvm_s390_real_to_abs(vcpu, vcpu->run->s.regs.gprs[reg1]);
+
+ /* Make sure that the source is paged-in */
+ hostaddr = gmap_fault(srcaddr, vcpu->arch.gmap);
+ if (IS_ERR_VALUE(hostaddr))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ down_read(&mm->mmap_sem);
+ rc = get_user_pages(current, mm, hostaddr, 1, 0, 0, NULL, NULL);
+ up_read(&mm->mmap_sem);
+ if (rc < 0)
+ return rc;
+
+ /* Make sure that the destination is paged-in */
+ hostaddr = gmap_fault(dstaddr, vcpu->arch.gmap);
+ if (IS_ERR_VALUE(hostaddr))
+ return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
+ down_read(&mm->mmap_sem);
+ rc = get_user_pages(current, mm, hostaddr, 1, 1, 0, NULL, NULL);
+ up_read(&mm->mmap_sem);
+ if (rc < 0)
+ return rc;
+
+ psw->addr = __rewind_psw(*psw, 4);
+
+ return 0;
+}
+
+static int handle_partial_execution(struct kvm_vcpu *vcpu)
+{
+ if (vcpu->arch.sie_block->ipa == 0xb254) /* MVPG */
+ return handle_mvpg_pei(vcpu);
+
+ return -EOPNOTSUPP;
+}
+
static const intercept_handler_t intercept_funcs[] = {
[0x00 >> 2] = handle_noop,
[0x04 >> 2] = handle_instruction,
@@ -245,6 +297,7 @@ static const intercept_handler_t intercept_funcs[] = {
[0x1C >> 2] = kvm_s390_handle_wait,
[0x20 >> 2] = handle_validity,
[0x28 >> 2] = handle_stop,
+ [0x38 >> 2] = handle_partial_execution,
};
int kvm_handle_sie_intercept(struct kvm_vcpu *vcpu)
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