Update __kvm_mips_vcpu_run() to only save and restore callee saved registers. It is always called using the standard ABIs, so the caller will preserve any other registers that need preserving. Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx> Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx> Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> Cc: Radim Krčmář <rkrcmar@xxxxxxxxxx> Cc: linux-mips@xxxxxxxxxxxxxx Cc: kvm@xxxxxxxxxxxxxxx --- arch/mips/kvm/locore.S | 48 +----------------------------------------------- 1 file changed, 1 insertion(+), 47 deletions(-) diff --git a/arch/mips/kvm/locore.S b/arch/mips/kvm/locore.S index 308706493fd5..3ea522e4954b 100644 --- a/arch/mips/kvm/locore.S +++ b/arch/mips/kvm/locore.S @@ -53,40 +53,14 @@ FEXPORT(__kvm_mips_vcpu_run) /* k0/k1 not being used in host kernel context */ INT_ADDIU k1, sp, -PT_SIZE - LONG_S $0, PT_R0(k1) - LONG_S $1, PT_R1(k1) - LONG_S $2, PT_R2(k1) - LONG_S $3, PT_R3(k1) - - LONG_S $4, PT_R4(k1) - LONG_S $5, PT_R5(k1) - LONG_S $6, PT_R6(k1) - LONG_S $7, PT_R7(k1) - - LONG_S $8, PT_R8(k1) - LONG_S $9, PT_R9(k1) - LONG_S $10, PT_R10(k1) - LONG_S $11, PT_R11(k1) - LONG_S $12, PT_R12(k1) - LONG_S $13, PT_R13(k1) - LONG_S $14, PT_R14(k1) - LONG_S $15, PT_R15(k1) LONG_S $16, PT_R16(k1) LONG_S $17, PT_R17(k1) - LONG_S $18, PT_R18(k1) LONG_S $19, PT_R19(k1) LONG_S $20, PT_R20(k1) LONG_S $21, PT_R21(k1) LONG_S $22, PT_R22(k1) LONG_S $23, PT_R23(k1) - LONG_S $24, PT_R24(k1) - LONG_S $25, PT_R25(k1) - - /* - * XXXKYMA k0/k1 not saved, not being used if we got here through - * an ioctl() - */ LONG_S $28, PT_R28(k1) LONG_S $29, PT_R29(k1) @@ -545,10 +519,6 @@ __kvm_mips_return_to_host: LONG_L k0, PT_HOST_USERLOCAL(k1) mtc0 k0, CP0_DDATA_LO - /* Load context saved on the host stack */ - LONG_L $0, PT_R0(k1) - LONG_L $1, PT_R1(k1) - /* * r2/v0 is the return code, shift it down by 2 (arithmetic) * to recover the err code @@ -556,19 +526,7 @@ __kvm_mips_return_to_host: INT_SRA k0, v0, 2 move $2, k0 - LONG_L $3, PT_R3(k1) - LONG_L $4, PT_R4(k1) - LONG_L $5, PT_R5(k1) - LONG_L $6, PT_R6(k1) - LONG_L $7, PT_R7(k1) - LONG_L $8, PT_R8(k1) - LONG_L $9, PT_R9(k1) - LONG_L $10, PT_R10(k1) - LONG_L $11, PT_R11(k1) - LONG_L $12, PT_R12(k1) - LONG_L $13, PT_R13(k1) - LONG_L $14, PT_R14(k1) - LONG_L $15, PT_R15(k1) + /* Load context saved on the host stack */ LONG_L $16, PT_R16(k1) LONG_L $17, PT_R17(k1) LONG_L $18, PT_R18(k1) @@ -577,10 +535,6 @@ __kvm_mips_return_to_host: LONG_L $21, PT_R21(k1) LONG_L $22, PT_R22(k1) LONG_L $23, PT_R23(k1) - LONG_L $24, PT_R24(k1) - LONG_L $25, PT_R25(k1) - - /* Host k0/k1 were not saved */ LONG_L $28, PT_R28(k1) LONG_L $29, PT_R29(k1) -- 2.4.10
