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author | Bharat Bhushan <Bharat.Bhushan@freescale.com> | 2014-08-13 14:39:44 +0530 |
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committer | Alexander Graf <agraf@suse.de> | 2014-09-22 10:11:33 +0200 |
commit | 2f699a59f399d65d51df6eb916bf2e0f7c6f8148 (patch) | |
tree | 05195a1fd71036497d12fd0e0605798a09a23bdf /arch/powerpc/include/asm/kvm_ppc.h | |
parent | 3840edc8033ad5b86deee309c1c321ca54257452 (diff) | |
download | linux-stable-2f699a59f399d65d51df6eb916bf2e0f7c6f8148.tar.gz linux-stable-2f699a59f399d65d51df6eb916bf2e0f7c6f8148.tar.bz2 linux-stable-2f699a59f399d65d51df6eb916bf2e0f7c6f8148.zip |
KVM: PPC: BOOKE: Emulate debug registers and exception
This patch emulates debug registers and debug exception
to support guest using debug resource. This enables running
gdb/kgdb etc in guest.
On BOOKE architecture we cannot share debug resources between QEMU and
guest because:
When QEMU is using debug resources then debug exception must
be always enabled. To achieve this we set MSR_DE and also set
MSRP_DEP so guest cannot change MSR_DE.
When emulating debug resource for guest we want guest
to control MSR_DE (enable/disable debug interrupt on need).
So above mentioned two configuration cannot be supported
at the same time. So the result is that we cannot share
debug resources between QEMU and Guest on BOOKE architecture.
In the current design QEMU gets priority over guest, this means that if
QEMU is using debug resources then guest cannot use them and if guest is
using debug resource then QEMU can overwrite them.
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_ppc.h')
-rw-r--r-- | arch/powerpc/include/asm/kvm_ppc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h index fb86a2299d8a..05e58b630601 100644 --- a/arch/powerpc/include/asm/kvm_ppc.h +++ b/arch/powerpc/include/asm/kvm_ppc.h @@ -206,6 +206,9 @@ extern int kvmppc_xics_get_xive(struct kvm *kvm, u32 irq, u32 *server, extern int kvmppc_xics_int_on(struct kvm *kvm, u32 irq); extern int kvmppc_xics_int_off(struct kvm *kvm, u32 irq); +void kvmppc_core_dequeue_debug(struct kvm_vcpu *vcpu); +void kvmppc_core_queue_debug(struct kvm_vcpu *vcpu); + union kvmppc_one_reg { u32 wval; u64 dval; |