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ARM64: KVM: fix big endian issue in access_vm_reg for 32bit guest

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Fix issue with 32bit guests running on top of BE KVM host.
Indexes of high and low words of 64bit cp15 register are
swapped in case of big endian code, since 64bit cp15 state is
restored or saved with double word write or read instruction.

Define helper macro to access low words of 64bit cp15 register.

Signed-off-by: Victor Kamensky <victor.kamensky@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Victor Kamensky 2014-07-02 17:19:30 +01:00 committed by Christoffer Dall
parent 26c99af101
commit f0a3eaff71
2 changed files with 10 additions and 6 deletions
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6
arch/arm64/include/asm/kvm_host.h
View File

@ -140,6 +140,12 @@ struct kvm_vcpu_arch {
#define vcpu_sys_reg(v,r) ((v)->arch.ctxt.sys_regs[(r)])
#define vcpu_cp15(v,r) ((v)->arch.ctxt.cp15[(r)])
#ifdef CONFIG_CPU_BIG_ENDIAN
#define vcpu_cp15_64_low(v,r) ((v)->arch.ctxt.cp15[((r) + 1)])
#else
#define vcpu_cp15_64_low(v,r) ((v)->arch.ctxt.cp15[((r) + 0)])
#endif
struct kvm_vm_stat {
u32 remote_tlb_flush;
};

10
arch/arm64/kvm/sys_regs.c
View File

@ -134,13 +134,11 @@ static bool access_vm_reg(struct kvm_vcpu *vcpu,
BUG_ON(!p->is_write);
val = *vcpu_reg(vcpu, p->Rt);
if (!p->is_aarch32) {
if (!p->is_aarch32 || !p->is_32bit)
vcpu_sys_reg(vcpu, r->reg) = val;
} else {
vcpu_cp15(vcpu, r->reg) = val & 0xffffffffUL;
if (!p->is_32bit)
vcpu_cp15(vcpu, r->reg + 1) = val >> 32;
}
else
vcpu_cp15_64_low(vcpu, r->reg) = val & 0xffffffffUL;
return true;
}