xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

MIPS: KVM: Don't hardcode restored HWREna

Browse Source 
KVM modifies CP0_HWREna during guest execution so it can trap and
emulate RDHWR instructions, however it always restores the hardcoded
value 0x2000000F. This assumes the presence of the UserLocal register,
and the absence of any implementation dependent or future HW registers.

Fix by exporting the value that traps.c write into CP0_HWREna, and
loading from there instead of hard coding.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
James Hogan
2016-06-15 19:29:53 +01:00
committed by Paolo Bonzini
parent aff565aab9
commit b937ff628f
3 changed files with 7 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
arch/mips/kernel/traps.c
View File

@@ -2064,10 +2064,13 @@ static void configure_status(void)
status_set);
}
unsigned int hwrena;
EXPORT_SYMBOL_GPL(hwrena);
/* configure HWRENA register */
static void configure_hwrena(void)
{
unsigned int hwrena = cpu_hwrena_impl_bits;
hwrena = cpu_hwrena_impl_bits;
if (cpu_has_mips_r2_r6)
hwrena |= MIPS_HWRENA_CPUNUM |