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| author | Janis Schoetterl-Glausch <scgl@linux.ibm.com> | 2021-06-29 11:55:30 +0300 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2021-08-27 19:35:20 +0300 |
| commit | 7119decf47d9867266459615be502e5d2cecedba (patch) | |
| tree | af9d76e4525e2be6fdf33853336a7bfe32e6a4e7 /arch/s390/include/asm/kvm_host.h | |
| parent | 1f703d2cf20464338c3d5279dddfb65ac79b8782 (diff) | |
| download | linux-7119decf47d9867266459615be502e5d2cecedba.tar.xz | |
KVM: s390: Enable specification exception interpretation
When this feature is enabled the hardware is free to interpret
specification exceptions generated by the guest, instead of causing
program interruption interceptions.
This benefits (test) programs that generate a lot of specification
exceptions (roughly 4x increase in exceptions/sec).
Interceptions will occur as before if ICTL_PINT is set,
i.e. if guest debug is enabled.
There is no indication if this feature is available or not and the
hardware is free to interpret or not. So we can simply set this bit and
if the hardware ignores it we fall back to intercept 8 handling.
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Link: https://lore.kernel.org/linux-s390/20210706114714.3936825-1-scgl@linux.ibm.com/
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/kvm_host.h')
| -rw-r--r-- | arch/s390/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 8925f3969478..118d5450c523 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -244,6 +244,7 @@ struct kvm_s390_sie_block { __u8 fpf; /* 0x0060 */ #define ECB_GS 0x40 #define ECB_TE 0x10 +#define ECB_SPECI 0x08 #define ECB_SRSI 0x04 #define ECB_HOSTPROTINT 0x02 __u8 ecb; /* 0x0061 */ |