From 89d6ad8a6b26a51f6fdfd356a56681a11f309bba Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 14 Dec 2016 01:58:44 +0000 Subject: [PATCH] KVM: MIPS/T&E: Ignore user writes to CP0_Config7 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Ignore userland writes to CP0_Config7 rather than reporting an error, since we do allow reads of this register and it is claimed to exist in the ioctl API. This allows userland to blindly save and restore KVM registers without having to special case certain registers as not being writable, for example during live migration once dirty page logging is fixed. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/trap_emul.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 1efe78d4bda8..d0b6409cb4a3 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -705,6 +705,9 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, kvm_write_c0_guest_config5(cop0, v); } break; + case KVM_REG_MIPS_CP0_CONFIG7: + /* writes ignored */ + break; case KVM_REG_MIPS_COUNT_CTL: ret = kvm_mips_set_count_ctl(vcpu, v); break; -- 2.20.1