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| author | Paul Mackerras <paulus@samba.org> | 2014-06-02 11:02:59 +1000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-28 15:22:17 +0200 |
| commit | 699a0ea0823d32030b0666b28ff8633960f7ffa7 (patch) | |
| tree | fdfa3e767593f47b66a08313e97cd0fe35b12300 /arch/powerpc/kvm/book3s_hv_rmhandlers.S | |
| parent | 1f0eeb7e1a88f46afa0f435cf7c34b0c84cf2394 (diff) | |
| download | kernel_replicant_linux-699a0ea0823d32030b0666b28ff8633960f7ffa7.tar.gz kernel_replicant_linux-699a0ea0823d32030b0666b28ff8633960f7ffa7.tar.bz2 kernel_replicant_linux-699a0ea0823d32030b0666b28ff8633960f7ffa7.zip | |
KVM: PPC: Book3S: Controls for in-kernel sPAPR hypercall handling
This provides a way for userspace controls which sPAPR hcalls get
handled in the kernel. Each hcall can be individually enabled or
disabled for in-kernel handling, except for H_RTAS. The exception
for H_RTAS is because userspace can already control whether
individual RTAS functions are handled in-kernel or not via the
KVM_PPC_RTAS_DEFINE_TOKEN ioctl, and because the numeric value for
H_RTAS is out of the normal sequence of hcall numbers.
Hcalls are enabled or disabled using the KVM_ENABLE_CAP ioctl for the
KVM_CAP_PPC_ENABLE_HCALL capability on the file descriptor for the VM.
The args field of the struct kvm_enable_cap specifies the hcall number
in args[0] and the enable/disable flag in args[1]; 0 means disable
in-kernel handling (so that the hcall will always cause an exit to
userspace) and 1 means enable. Enabling or disabling in-kernel
handling of an hcall is effective across the whole VM.
The ability for KVM_ENABLE_CAP to be used on a VM file descriptor
on PowerPC is new, added by this commit. The KVM_CAP_ENABLE_CAP_VM
capability advertises that this ability exists.
When a VM is created, an initial set of hcalls are enabled for
in-kernel handling. The set that is enabled is the set that have
an in-kernel implementation at this point. Any new hcall
implementations from this point onwards should not be added to the
default set without a good reason.
No distinction is made between real-mode and virtual-mode hcall
implementations; the one setting controls them both.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv_rmhandlers.S')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv_rmhandlers.S | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S index 64ac56f6c3fe..33aaadef7139 100644 --- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S +++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S @@ -1909,6 +1909,17 @@ hcall_try_real_mode: clrrdi r3,r3,2 cmpldi r3,hcall_real_table_end - hcall_real_table bge guest_exit_cont + /* See if this hcall is enabled for in-kernel handling */ + ld r4, VCPU_KVM(r9) + srdi r0, r3, 8 /* r0 = (r3 / 4) >> 6 */ + sldi r0, r0, 3 /* index into kvm->arch.enabled_hcalls[] */ + add r4, r4, r0 + ld r0, KVM_ENABLED_HCALLS(r4) + rlwinm r4, r3, 32-2, 0x3f /* r4 = (r3 / 4) & 0x3f */ + srd r0, r0, r4 + andi. r0, r0, 1 + beq guest_exit_cont + /* Get pointer to handler, if any, and call it */ LOAD_REG_ADDR(r4, hcall_real_table) lwax r3,r3,r4 cmpwi r3,0 |