diff options
Diffstat (limited to 'arch/mips/include/asm/kvm_host.h')
| -rw-r--r-- | arch/mips/include/asm/kvm_host.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 5e9da2a..6c43c78 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -74,8 +74,14 @@ -/* Special address that contains the comm page, used for reducing # of traps */ -#define KVM_GUEST_COMMPAGE_ADDR 0x0 +/* + * Special address that contains the comm page, used for reducing # of traps + * This needs to be within 32Kb of 0x0 (so the zero register can be used), but + * preferably not at 0x0 so that most kernel NULL pointer dereferences can be + * caught. + */ +#define KVM_GUEST_COMMPAGE_ADDR ((PAGE_SIZE > 0x8000) ? 0 : \ + (0x8000 - PAGE_SIZE)) #define KVM_GUEST_KERNEL_MODE(vcpu) ((kvm_read_c0_guest_status(vcpu->arch.cop0) & (ST0_EXL | ST0_ERL)) || \ ((kvm_read_c0_guest_status(vcpu->arch.cop0) & KSU_USER) == 0)) |