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KVM: s390: Make psw available on all exits, not just a subset

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This patch moves s390 processor status word into the base kvm_run
struct and keeps it up-to date on all userspace exits.

The userspace ABI is broken by this, however there are no applications
in the wild using this.  A capability check is provided so users can
verify the updated API exists.

Cc: stable@kernel.org
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Carsten Otte 2009-11-19 14:21:16 +01:00 committed by Avi Kivity
parent 3cfc3092f4
commit d7b0b5eb30
3 changed files with 25 additions and 11 deletions
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3
arch/s390/include/asm/kvm.h
View File

@ -1,6 +1,5 @@
#ifndef __LINUX_KVM_S390_H
#define __LINUX_KVM_S390_H
/*
* asm-s390/kvm.h - KVM s390 specific structures and definitions
*
@ -15,6 +14,8 @@
*/
#include <linux/types.h>
#define __KVM_S390
/* for KVM_GET_REGS and KVM_SET_REGS */
struct kvm_regs {
/* general purpose regs for s390 */

25
arch/s390/kvm/kvm-s390.c
View File

@ -117,10 +117,16 @@ long kvm_arch_dev_ioctl(struct file *filp,
int kvm_dev_ioctl_check_extension(long ext)
{
int r;
switch (ext) {
case KVM_CAP_S390_PSW:
r = 1;
break;
default:
return 0;
r = 0;
}
return r;
}
/* Section: vm related */
@ -420,8 +426,10 @@ static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
vcpu_load(vcpu);
if (atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_RUNNING)
rc = -EBUSY;
else
vcpu->arch.sie_block->gpsw = psw;
else {
vcpu->run->psw_mask = psw.mask;
vcpu->run->psw_addr = psw.addr;
}
vcpu_put(vcpu);
return rc;
}
@ -509,9 +517,6 @@ rerun_vcpu:
switch (kvm_run->exit_reason) {
case KVM_EXIT_S390_SIEIC:
vcpu->arch.sie_block->gpsw.mask = kvm_run->s390_sieic.mask;
vcpu->arch.sie_block->gpsw.addr = kvm_run->s390_sieic.addr;
break;
case KVM_EXIT_UNKNOWN:
case KVM_EXIT_INTR:
case KVM_EXIT_S390_RESET:
@ -520,6 +525,9 @@ rerun_vcpu:
BUG();
}
vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
might_fault();
do {
@ -539,8 +547,6 @@ rerun_vcpu:
/* intercept cannot be handled in-kernel, prepare kvm-run */
kvm_run->exit_reason = KVM_EXIT_S390_SIEIC;
kvm_run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
kvm_run->s390_sieic.mask = vcpu->arch.sie_block->gpsw.mask;
kvm_run->s390_sieic.addr = vcpu->arch.sie_block->gpsw.addr;
kvm_run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
kvm_run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
rc = 0;
@ -552,6 +558,9 @@ rerun_vcpu:
rc = 0;
}
kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);

8
include/linux/kvm.h
View File

@ -181,6 +181,11 @@ struct kvm_run {
__u64 cr8;
__u64 apic_base;
#ifdef __KVM_S390
/* the processor status word for s390 */
__u64 psw_mask; /* psw upper half */
__u64 psw_addr; /* psw lower half */
#endif
union {
/* KVM_EXIT_UNKNOWN */
struct {
@ -232,8 +237,6 @@ struct kvm_run {
/* KVM_EXIT_S390_SIEIC */
struct {
__u8 icptcode;
__u64 mask; /* psw upper half */
__u64 addr; /* psw lower half */
__u16 ipa;
__u32 ipb;
} s390_sieic;
@ -492,6 +495,7 @@ struct kvm_ioeventfd {
#ifdef __KVM_HAVE_VCPU_EVENTS
#define KVM_CAP_VCPU_EVENTS 41
#endif
#define KVM_CAP_S390_PSW 42
#ifdef KVM_CAP_IRQ_ROUTING