On 25.01.2018 14:28, Christian Borntraeger wrote:
> From: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
>
> The patch modifies the previously defined GISA data structure to be
> able to store two GISA formats, format-0 and format-1. Additionally,
> it verifies the availability of the GISA format facility and enables
> the use of a format-1 GISA in the SIE control block accordingly.
>
> Signed-off-by: Michael Mueller <mimu@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxxxxxxx>
> Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> ---
> arch/s390/include/asm/kvm_host.h | 44 +++++++++++++++++++++++++++++++---------
> arch/s390/kvm/kvm-s390.c | 2 ++
> 2 files changed, 36 insertions(+), 10 deletions(-)
>
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 6802d5d..287c99b 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -228,6 +228,7 @@ struct kvm_s390_sie_block {
> __u8 epdx; /* 0x0069 */
> __u8 reserved6a[2]; /* 0x006a */
> __u32 todpr; /* 0x006c */
> +#define GISA_FORMAT1 0x00000001
> __u32 gd; /* 0x0070 */
> __u8 reserved74[12]; /* 0x0074 */
> __u64 mso; /* 0x0080 */
> @@ -706,15 +707,38 @@ struct kvm_s390_crypto_cb {
> };
>
> 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;
> + union {
> + struct { /* common to all formats */
> + u32 next_alert;
> + u8 ipm;
> + u8 reserved01[2];
> + u8 iam;
> + };
> + struct { /* format 0 */
> + u32 next_alert;
> + u8 ipm;
> + u8 reserved01;
> + u8 : 6;
> + u8 g : 1;
> + u8 c : 1;
> + u8 iam;
> + u8 reserved02[4];
> + u32 airq_count;
> + } g0;
> + struct { /* format 1 */
> + u32 next_alert;
> + u8 ipm;
> + u8 simm;
> + u8 nimm;
> + u8 iam;
> + u8 aism[8];
> + u8 : 6;
> + u8 g : 1;
> + u8 c : 1;
> + u8 reserved03[11];
> + u32 airq_count;
> + } g1;
> + };
> };
>
> /*
> @@ -725,7 +749,7 @@ struct sie_page2 {
> __u64 fac_list[S390_ARCH_FAC_LIST_SIZE_U64]; /* 0x0000 */
> struct kvm_s390_crypto_cb crycb; /* 0x0800 */
> struct kvm_s390_gisa gisa; /* 0x0900 */
> - u8 reserved910[0x1000 - 0x910]; /* 0x0910 */
> + u8 reserved920[0x1000 - 0x920]; /* 0x0920 */
> };
>
> struct kvm_s390_vsie {
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 68d7eef..efde264 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -2518,6 +2518,8 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
> vcpu->arch.sie_block->icpua = id;
> spin_lock_init(&vcpu->arch.local_int.lock);
> vcpu->arch.sie_block->gd = (u32)(u64)kvm->arch.gisa;
> + if (vcpu->arch.sie_block->gd && sclp.has_gisaf)
> + vcpu->arch.sie_block->gd |= GISA_FORMAT1;
> seqcount_init(&vcpu->arch.cputm_seqcount);
>
> rc = kvm_vcpu_init(vcpu, kvm, id);
>
So, what does this bring us? We don't seem to be using any new GISA-1
features.
--
Thanks,
David / dhildenb
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