diff options
| author | Paul Mackerras | 2013-02-04 19:10:51 +0100 |
|---|---|---|
| committer | Benjamin Herrenschmidt | 2013-02-15 06:54:33 +0100 |
| commit | 0acb91112a148fbb31678e66839ef757f3be3aa4 (patch) | |
| tree | 9516f90d03a55bc07f8b13b67d497dea8062430c /arch/powerpc/include/asm/kvm_book3s_asm.h | |
| parent | powerpc: Save CFAR before branching in interrupt entry paths (diff) | |
| download | kernel-qcow2-linux-0acb91112a148fbb31678e66839ef757f3be3aa4.tar.gz kernel-qcow2-linux-0acb91112a148fbb31678e66839ef757f3be3aa4.tar.xz kernel-qcow2-linux-0acb91112a148fbb31678e66839ef757f3be3aa4.zip | |
powerpc/kvm/book3s_hv: Preserve guest CFAR register value
The CFAR (Come-From Address Register) is a useful debugging aid that
exists on POWER7 processors. Currently HV KVM doesn't save or restore
the CFAR register for guest vcpus, making the CFAR of limited use in
guests.
This adds the necessary code to capture the CFAR value saved in the
early exception entry code (it has to be saved before any branch is
executed), save it in the vcpu.arch struct, and restore it on entry
to the guest.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_book3s_asm.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s_asm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_asm.h b/arch/powerpc/include/asm/kvm_book3s_asm.h index 88609b23b775..cdc3d2717cc6 100644 --- a/arch/powerpc/include/asm/kvm_book3s_asm.h +++ b/arch/powerpc/include/asm/kvm_book3s_asm.h @@ -93,6 +93,9 @@ struct kvmppc_host_state { u64 host_dscr; u64 dec_expires; #endif +#ifdef CONFIG_PPC_BOOK3S_64 + u64 cfar; +#endif }; struct kvmppc_book3s_shadow_vcpu { |