[PATCH V2 02/14] KVM: MIPS: Fix VPN2_MASK definition for variable cpu_vmbits

Huacai Chen
2020-04-24T11:07:35Z

From: Xing Li <lixing@loongson.cn>

If a CPU support more than 32bit vmbits (which is true for 64bit CPUs),
VPN2_MASK set to fixed 0xffffe000 will lead to a wrong EntryHi in some
functions such as _kvm_mips_host_tlb_inv().

The cpu_vmbits definition of 32bit CPU in cpu-features.h is 31, so we
still use the old definition.

Cc: stable@vger.kernel.org
Signed-off-by: Xing Li <lixing@loongson.cn>
[Huacai: Improve commit messages]
Signed-off-by: Huacai Chen <chenhc@lemote.com>
---
arch/mips/include/asm/kvm_host.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index a01cee9..caa2b936 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -274,7 +274,11 @@ enum emulation_result {
#define MIPS3_PG_SHIFT 6
#define MIPS3_PG_FRAME 0x3fffffc0

+#if defined(CONFIG_64BIT)
+#define VPN2_MASK GENMASK(cpu_vmbits - 1, 13)
+#else
#define VPN2_MASK 0xffffe000
+#endif
#define KVM_ENTRYHI_ASID cpu_asid_mask(&boot_cpu_data)
#define TLB_IS_GLOBAL(x) ((x).tlb_lo[0] & (x).tlb_lo[1] & ENTRYLO_G)
#define TLB_VPN2(x) ((x).tlb_hi & VPN2_MASK)
--
2.7.0