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| author | Paul Mackerras <paulus@samba.org> | 2013-02-04 18:10:51 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-02-15 16:54:33 +1100 |
| commit | 0acb91112a148fbb31678e66839ef757f3be3aa4 (patch) | |
| tree | 9516f90d03a55bc07f8b13b67d497dea8062430c /arch/powerpc/include/asm/kvm_host.h | |
| parent | 1707dd161349e6c54170c88d94fed012e3d224e3 (diff) | |
| download | lwn-0acb91112a148fbb31678e66839ef757f3be3aa4.tar.gz lwn-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_host.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_host.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index ca9bf459db6a..03d7beae89a0 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -440,6 +440,7 @@ struct kvm_vcpu_arch { ulong uamor; u32 ctrl; ulong dabr; + ulong cfar; #endif u32 vrsave; /* also USPRG0 */ u32 mmucr; |