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KVM: s390: define GISA format-0 data structure 

In preperation to support pass-through adapter interrupts, the Guest
Interruption State Area (GISA) and the Adapter Interruption Virtualization
(AIV) features will be introduced here.

This patch introduces format-0 GISA (that is defines the struct describing
the GISA, allocates storage for it, and introduces fields for the
GISA address in kvm_s390_sie_block and kvm_s390_vsie).

As the GISA requires storage below 2GB, it is put in sie_page2, which is
already allocated in ZONE_DMA. In addition, The GISA requires alignment to
its integral boundary. This is already naturally aligned via the
padding in the sie_page2.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Reviewed-by: Pierre Morel <pmorel@linux.vnet.ibm.com>
Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Michael Mueller 2017-05-30 14:26:02 +02:00 committed by Christian Borntraeger
parent c7901a6ebe
commit 19114beb73
2 changed files with 20 additions and 4 deletions
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23
arch/s390/include/asm/kvm_host.h
View File

@ -183,6 +183,7 @@ struct kvm_s390_sie_block {
#define ECA_IB 0x40000000
#define ECA_SIGPI 0x10000000
#define ECA_MVPGI 0x01000000
#define ECA_AIV 0x00200000
#define ECA_VX 0x00020000
#define ECA_PROTEXCI 0x00002000
#define ECA_SII 0x00000001
@ -227,7 +228,8 @@ struct kvm_s390_sie_block {
__u8 epdx; /* 0x0069 */
__u8 reserved6a[2]; /* 0x006a */
__u32 todpr; /* 0x006c */
__u8 reserved70[16]; /* 0x0070 */
__u32 gd; /* 0x0070 */
__u8 reserved74[12]; /* 0x0074 */
__u64 mso; /* 0x0080 */
__u64 msl; /* 0x0088 */
psw_t gpsw; /* 0x0090 */
@ -716,14 +718,27 @@ struct kvm_s390_crypto_cb {
struct kvm_s390_apcb1 apcb1; /* 0x0080 */
};
struct kvm_s390_gisa {
u32 next_alert;
u8 ipm;
u8 reserved01;
u8 : 6;
u8 g : 1;
u8 c : 1;
u8 iam;
u8 reserved02[4];
u32 airq_count;
};
/*
* sie_page2 has to be allocated as DMA because fac_list and crycb need
* 31bit addresses in the sie control block.
* sie_page2 has to be allocated as DMA because fac_list, crycb and
* gisa need 31bit addresses in the sie control block.
*/
struct sie_page2 {
__u64 fac_list[S390_ARCH_FAC_LIST_SIZE_U64]; /* 0x0000 */
struct kvm_s390_crypto_cb crycb; /* 0x0800 */
u8 reserved900[0x1000 - 0x900]; /* 0x0900 */
struct kvm_s390_gisa gisa; /* 0x0900 */
u8 reserved910[0x1000 - 0x910]; /* 0x0910 */
};
struct kvm_s390_vsie {

1
arch/s390/kvm/kvm-s390.c
View File

@ -1928,6 +1928,7 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
if (!kvm->arch.dbf)
goto out_err;
BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
kvm->arch.sie_page2 =
(struct sie_page2 *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!kvm->arch.sie_page2)