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KVM: s390: split store status and machine check handling 

Store status writes the prefix which is not to be done by a machine check.
Also, the psw is stored and later on overwritten by the failing-storage
address, which looks strange at first sight.

Store status and machine check handling look similar, but they are actually
two different things.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-08-03 11:18:57 +02:00 committed by Christian Borntraeger
parent d6404ded30
commit 0319dae677
1 changed files with 28 additions and 1 deletions
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29
arch/s390/kvm/interrupt.c
View File

@ -24,6 +24,7 @@
#include <asm/sclp.h>
#include <asm/isc.h>
#include <asm/gmap.h>
#include <asm/switch_to.h>
#include "kvm-s390.h"
#include "gaccess.h"
#include "trace-s390.h"
@ -404,14 +405,20 @@ static int __write_machine_check(struct kvm_vcpu *vcpu,
struct kvm_s390_mchk_info *mchk)
{
unsigned long ext_sa_addr;
freg_t fprs[NUM_FPRS];
int rc;
/* take care of lazy register loading via vcpu load/put */
save_fpu_regs();
save_access_regs(vcpu->run->s.regs.acrs);
/* Extended save area */
rc = read_guest_lc(vcpu, __LC_VX_SAVE_AREA_ADDR, &ext_sa_addr,
sizeof(unsigned long));
rc |= kvm_s390_vcpu_store_adtl_status(vcpu, ext_sa_addr);
/* General interruption information */
rc |= put_guest_lc(vcpu, 1, (u8 __user *) __LC_AR_MODE_ID);
rc |= write_guest_lc(vcpu, __LC_MCK_OLD_PSW,
&vcpu->arch.sie_block->gpsw, sizeof(psw_t));
rc |= read_guest_lc(vcpu, __LC_MCK_NEW_PSW,
@ -419,7 +426,27 @@ static int __write_machine_check(struct kvm_vcpu *vcpu,
rc |= put_guest_lc(vcpu, mchk->mcic, (u64 __user *) __LC_MCCK_CODE);
/* Register-save areas */
rc |= kvm_s390_vcpu_store_status(vcpu, KVM_S390_STORE_STATUS_PREFIXED);
if (MACHINE_HAS_VX) {
convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA, fprs, 128);
} else {
rc |= write_guest_lc(vcpu, __LC_FPREGS_SAVE_AREA,
vcpu->run->s.regs.fprs, 128);
}
rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA,
vcpu->run->s.regs.gprs, 128);
rc |= put_guest_lc(vcpu, current->thread.fpu.fpc,
(u32 __user *) __LC_FP_CREG_SAVE_AREA);
rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr,
(u32 __user *) __LC_TOD_PROGREG_SAVE_AREA);
rc |= put_guest_lc(vcpu, kvm_s390_get_cpu_timer(vcpu),
(u64 __user *) __LC_CPU_TIMER_SAVE_AREA);
rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->ckc >> 8,
(u64 __user *) __LC_CLOCK_COMP_SAVE_AREA);
rc |= write_guest_lc(vcpu, __LC_AREGS_SAVE_AREA,
&vcpu->run->s.regs.acrs, 64);
rc |= write_guest_lc(vcpu, __LC_CREGS_SAVE_AREA,
&vcpu->arch.sie_block->gcr, 128);
/* Extended interruption information */
rc |= put_guest_lc(vcpu, mchk->failing_storage_address,