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KVM: PPC: Book3S: correct width in XER handling 

In 64 bit kernels, the Fixed Point Exception Register (XER) is a 64
bit field (e.g. in kvm_regs and kvm_vcpu_arch) and in most places it is
accessed as such.

This patch corrects places where it is accessed as a 32 bit field by a
64 bit kernel.  In some cases this is via a 32 bit load or store
instruction which, depending on endianness, will cause either the
lower or upper 32 bits to be missed.  In another case it is cast as a
u32, causing the upper 32 bits to be cleared.

This patch corrects those places by extending the access methods to
64 bits.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Sam bobroff 2015-05-27 09:56:57 +10:00 committed by Alexander Graf
parent 563a1e93af
commit c63517c2e3
5 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -226,12 +226,12 @@ static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
return vcpu->arch.cr;
}
static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, u32 val)
static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
{
vcpu->arch.xer = val;
}
static inline u32 kvmppc_get_xer(struct kvm_vcpu *vcpu)
static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
{
return vcpu->arch.xer;
}

2
arch/powerpc/include/asm/kvm_book3s_asm.h
View File

@ -132,7 +132,7 @@ struct kvmppc_book3s_shadow_vcpu {
bool in_use;
ulong gpr[14];
u32 cr;
u32 xer;
ulong xer;
ulong ctr;
ulong lr;
ulong pc;

4
arch/powerpc/include/asm/kvm_booke.h
View File

@ -54,12 +54,12 @@ static inline u32 kvmppc_get_cr(struct kvm_vcpu *vcpu)
return vcpu->arch.cr;
}
static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, u32 val)
static inline void kvmppc_set_xer(struct kvm_vcpu *vcpu, ulong val)
{
vcpu->arch.xer = val;
}
static inline u32 kvmppc_get_xer(struct kvm_vcpu *vcpu)
static inline ulong kvmppc_get_xer(struct kvm_vcpu *vcpu)
{
return vcpu->arch.xer;
}

6
arch/powerpc/kvm/book3s_hv_rmhandlers.S
View File

@ -944,7 +944,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
blt hdec_soon
ld r6, VCPU_CTR(r4)
lwz r7, VCPU_XER(r4)
ld r7, VCPU_XER(r4)
mtctr r6
mtxer r7
@ -1181,7 +1181,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
mfctr r3
mfxer r4
std r3, VCPU_CTR(r9)
stw r4, VCPU_XER(r9)
std r4, VCPU_XER(r9)
/* If this is a page table miss then see if it's theirs or ours */
cmpwi r12, BOOK3S_INTERRUPT_H_DATA_STORAGE
@ -1763,7 +1763,7 @@ kvmppc_hdsi:
bl kvmppc_msr_interrupt
fast_interrupt_c_return:
6: ld r7, VCPU_CTR(r9)
lwz r8, VCPU_XER(r9)
ld r8, VCPU_XER(r9)
mtctr r7
mtxer r8
mr r4, r9

4
arch/powerpc/kvm/book3s_segment.S
View File

@ -123,7 +123,7 @@ no_dcbz32_on:
PPC_LL r8, SVCPU_CTR(r3)
PPC_LL r9, SVCPU_LR(r3)
lwz r10, SVCPU_CR(r3)
lwz r11, SVCPU_XER(r3)
PPC_LL r11, SVCPU_XER(r3)
mtctr r8
mtlr r9
@ -237,7 +237,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
mfctr r8
mflr r9
stw r5, SVCPU_XER(r13)
PPC_STL r5, SVCPU_XER(r13)
PPC_STL r6, SVCPU_FAULT_DAR(r13)
stw r7, SVCPU_FAULT_DSISR(r13)
PPC_STL r8, SVCPU_CTR(r13)