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author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-01-18 14:46:34 +0100 |
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committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-02-10 13:12:49 +0100 |
commit | 6fd8e67dd83437118cf46a4a9c224142004c3d51 (patch) | |
tree | 99b5feb06cbeb2fd6dbd0fd3a6adbac54dbe37fd /arch/s390/include | |
parent | f6aa6dc44948739be39c20bbcbbe8cff5d77fe18 (diff) | |
download | linux-6fd8e67dd83437118cf46a4a9c224142004c3d51.tar.gz linux-6fd8e67dd83437118cf46a4a9c224142004c3d51.tar.bz2 linux-6fd8e67dd83437118cf46a4a9c224142004c3d51.zip |
KVM: s390: sync of fp registers via kvm_run
As we already store the floating point registers in the vector save area
in floating point register format when we don't have MACHINE_HAS_VX, we can
directly expose them to user space using a new sync flag.
The floating point registers will be valid when KVM_SYNC_FPRS is set. The
fpc will also be valid when KVM_SYNC_FPRS is set.
Either KVM_SYNC_FPRS or KVM_SYNC_VRS will be enabled, never both.
Let's also change two positions where we access vrs, making the code easier
to read and one comment superfluous.
Suggested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/include')
-rw-r--r-- | arch/s390/include/uapi/asm/kvm.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h index fe84bd5fe7ce..347fe5afa419 100644 --- a/arch/s390/include/uapi/asm/kvm.h +++ b/arch/s390/include/uapi/asm/kvm.h @@ -154,6 +154,7 @@ struct kvm_guest_debug_arch { #define KVM_SYNC_PFAULT (1UL << 5) #define KVM_SYNC_VRS (1UL << 6) #define KVM_SYNC_RICCB (1UL << 7) +#define KVM_SYNC_FPRS (1UL << 8) /* definition of registers in kvm_run */ struct kvm_sync_regs { __u64 prefix; /* prefix register */ @@ -168,9 +169,12 @@ struct kvm_sync_regs { __u64 pft; /* pfault token [PFAULT] */ __u64 pfs; /* pfault select [PFAULT] */ __u64 pfc; /* pfault compare [PFAULT] */ - __u64 vrs[32][2]; /* vector registers */ + union { + __u64 vrs[32][2]; /* vector registers (KVM_SYNC_VRS) */ + __u64 fprs[16]; /* fp registers (KVM_SYNC_FPRS) */ + }; __u8 reserved[512]; /* for future vector expansion */ - __u32 fpc; /* only valid with vector registers */ + __u32 fpc; /* valid on KVM_SYNC_VRS or KVM_SYNC_FPRS */ __u8 padding[52]; /* riccb needs to be 64byte aligned */ __u8 riccb[64]; /* runtime instrumentation controls block */ }; |