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s390/kvm: cleanup/fix handle_tpi() 

- add missing specification exception check
- remove one level of indentation
- use defines instead of magic numbers

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Heiko Carstens 2013-03-05 13:14:46 +01:00 committed by Marcelo Tosatti
parent f9dc72e82d
commit 7c959e82ac
1 changed files with 30 additions and 24 deletions
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54
arch/s390/kvm/priv.c
View File

@ -14,6 +14,7 @@
#include <linux/kvm.h>
#include <linux/gfp.h>
#include <linux/errno.h>
#include <asm/asm-offsets.h>
#include <asm/current.h>
#include <asm/debug.h>
#include <asm/ebcdic.h>
@ -129,39 +130,44 @@ static int handle_skey(struct kvm_vcpu *vcpu)
static int handle_tpi(struct kvm_vcpu *vcpu)
{
u64 addr;
struct kvm_s390_interrupt_info *inti;
u64 addr;
int cc;
addr = kvm_s390_get_base_disp_s(vcpu);
if (addr & 3) {
kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
goto out;
}
cc = 0;
inti = kvm_s390_get_io_int(vcpu->kvm, vcpu->run->s.regs.crs[6], 0);
if (inti) {
if (addr) {
/*
* Store the two-word I/O interruption code into the
* provided area.
*/
put_guest(vcpu, inti->io.subchannel_id, (u16 *) addr);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) (addr + 2));
put_guest(vcpu, inti->io.io_int_parm, (u32 *) (addr + 4));
} else {
/*
* Store the three-word I/O interruption code into
* the appropriate lowcore area.
*/
put_guest(vcpu, inti->io.subchannel_id, (u16 *) 184);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) 186);
put_guest(vcpu, inti->io.io_int_parm, (u32 *) 188);
put_guest(vcpu, inti->io.io_int_word, (u32 *) 192);
}
cc = 1;
} else
cc = 0;
if (!inti)
goto no_interrupt;
cc = 1;
if (addr) {
/*
* Store the two-word I/O interruption code into the
* provided area.
*/
put_guest(vcpu, inti->io.subchannel_id, (u16 *) addr);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) (addr + 2));
put_guest(vcpu, inti->io.io_int_parm, (u32 *) (addr + 4));
} else {
/*
* Store the three-word I/O interruption code into
* the appropriate lowcore area.
*/
put_guest(vcpu, inti->io.subchannel_id, (u16 *) __LC_SUBCHANNEL_ID);
put_guest(vcpu, inti->io.subchannel_nr, (u16 *) __LC_SUBCHANNEL_NR);
put_guest(vcpu, inti->io.io_int_parm, (u32 *) __LC_IO_INT_PARM);
put_guest(vcpu, inti->io.io_int_word, (u32 *) __LC_IO_INT_WORD);
}
kfree(inti);
no_interrupt:
/* Set condition code and we're done. */
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
vcpu->arch.sie_block->gpsw.mask |= (cc & 3ul) << 44;
out:
return 0;
}