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>

diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index e6b2534..9fac01c 100644 (file)
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -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;
 }

diff --git a/arch/powerpc/include/asm/kvm_book3s_asm.h b/arch/powerpc/include/asm/kvm_book3s_asm.h
index 57d5dfe..72b6225 100644 (file)
--- a/arch/powerpc/include/asm/kvm_book3s_asm.h
+++ b/arch/powerpc/include/asm/kvm_book3s_asm.h
@@ -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;

diff --git a/arch/powerpc/include/asm/kvm_booke.h b/arch/powerpc/include/asm/kvm_booke.h
index 3286f0d..bc6e29e 100644 (file)
--- a/arch/powerpc/include/asm/kvm_booke.h
+++ b/arch/powerpc/include/asm/kvm_booke.h
@@ -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;
 }

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index e347766..472680f 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -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

diff --git a/arch/powerpc/kvm/book3s_segment.S b/arch/powerpc/kvm/book3s_segment.S
index acee37c..ca8f174 100644 (file)
--- a/arch/powerpc/kvm/book3s_segment.S
+++ b/arch/powerpc/kvm/book3s_segment.S
@@ -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)