KVM: MIPS: Let indexed cacheops cause guest exit on Loongson-3

Loongson-3's indexed cache operations need a node-id in the address,
but in KVM guest the node-id may be incorrect. So, let indexed cache
operations cause guest exit on Loongson-3.

Reviewed-by: Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>
Signed-off-by: Huacai Chen <chenhc@lemote.com>
Co-developed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <1590220602-3547-9-git-send-email-chenhc@lemote.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
index 6e62154..20f6985 100644 (file)
--- a/arch/mips/kvm/vz.c
+++ b/arch/mips/kvm/vz.c
@@ -2853,8 +2853,12 @@ static int kvm_vz_hardware_enable(void)
        write_c0_guestctl0(MIPS_GCTL0_CP0 |
                           (MIPS_GCTL0_AT_GUEST << MIPS_GCTL0_AT_SHIFT) |
                           MIPS_GCTL0_CG | MIPS_GCTL0_CF);
-       if (cpu_has_guestctl0ext)
-               set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
+       if (cpu_has_guestctl0ext) {
+               if (current_cpu_type() != CPU_LOONGSON64)
+                       set_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
+               else
+                       clear_c0_guestctl0ext(MIPS_GCTL0EXT_CGI);
+       }
 
        if (cpu_has_guestid) {
                write_c0_guestctl1(0);