> -----Original Message----- > From: kvm-ppc-owner@xxxxxxxxxxxxxxx > [mailto:kvm-ppc-owner@xxxxxxxxxxxxxxx] On Behalf Of Alexander Graf > Sent: Wednesday, February 03, 2010 5:03 PM > To: Liu Yu-B13201 > Cc: hollis@xxxxxxxxxxxxxx; kvm-ppc@xxxxxxxxxxxxxxx; > kvm@xxxxxxxxxxxxxxx; Liu Yu-B13201 > Subject: Re: [PATCH 4/4] kvmppc/booke: exit_nr fixup for > guest debug single step > > > Am 03.02.2010 um 08:53 schrieb Liu Yu <yu.liu@xxxxxxxxxxxxx>: > > > As BOOKE doesn't have hardware support for virtualization, > > hardware never know who's guest and host. > > > > When enable hardware single step in guest, > > we cannot disabled it at the point we switch back to host. > > Why not? We directly arrive in our code. So we can just > disable it, no? > > Or does that break when you'd try to debug the guest > interrupt handlers? That's the hardware limitition. Assume received itlb miss interrupt, but it doesn't clear MSR_DE in MSR, so on the exit path single step still work and then debug interrupt is triggled. > > > Thus, we'll see that an single step interrupt happens at > > the beginning of guest exit path. > > > > Then we need to recognize this kind of single step interrupt > > and fix the exit_nr to the original value. > > So that everything looks like normal. > > > > Signed-off-by: Liu Yu <yu.liu@xxxxxxxxxxxxx> > > --- > > arch/powerpc/kvm/booke.c | 82 > ++++++++++++++++++++++++++ > > +++++++++ > > arch/powerpc/kvm/booke_interrupts.S | 9 ++-- > > 2 files changed, 87 insertions(+), 4 deletions(-) > > > > diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c > > index ec2722d..9056708 100644 > > --- a/arch/powerpc/kvm/booke.c > > +++ b/arch/powerpc/kvm/booke.c > > @@ -24,6 +24,7 @@ > > #include <linux/module.h> > > #include <linux/vmalloc.h> > > #include <linux/fs.h> > > +#include <linux/highmem.h> > > > > #include <asm/cputable.h> > > #include <asm/uaccess.h> > > @@ -34,6 +35,8 @@ > > #include "booke.h" > > > > unsigned long kvmppc_booke_handlers; > > +unsigned long kvmppc_booke_handler_addr[16]; > > +#define handler_vector_num > (sizeof(kvmppc_booke_handler_addr)/sizeof > > (kvmppc_booke_handler_addr[0])) > > > > #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM > > #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), > KVM_STAT_VCPU > > @@ -214,6 +217,80 @@ void kvmppc_core_deliver_interrupts(struct > > kvm_vcpu *vcpu) > > } > > } > > > > +int kvmppc_read_guest(struct kvm_vcpu *vcpu, unsigned long geaddr, > > + void *data, int len) > > Ah, nice. I have something similar in book3s.c. IIRC it's called > kvmppc_ld. > > I think we should make the semantics identical and declare it as > common kvmppc_core function. > Cool. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
