From be67a0be94b65746dee63af5c184c78d00a707f6 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Wed, 18 Jan 2017 16:20:31 +0000 Subject: [PATCH] KVM: MIPS/T&E: Default to reset vector MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Set the default VCPU state closer to the architectural reset state, with PC pointing at the reset vector (uncached PA 0x1fc00000, which for KVM T&E is VA 0x5fc00000), and with CP0_Status.BEV and CP0_Status.ERL to 1. Although QEMU at least will overwrite this state, it makes sense to do this now that CP0_EBase is properly implemented to check BEV, and now that we support a sparse GPA layout potentially with a boot ROM at GPA 0x1fc00000. 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 | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 80a681f42bf5..ce44f91c653a 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -614,6 +614,9 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) /* Set Wait IE/IXMT Ignore in Config7, IAR, AR */ kvm_write_c0_guest_config7(cop0, (MIPS_CONF7_WII) | (1 << 10)); + /* Status */ + kvm_write_c0_guest_status(cop0, ST0_BEV | ST0_ERL); + /* * Setup IntCtl defaults, compatibility mode for timer interrupts (HW5) */ @@ -623,6 +626,9 @@ static int kvm_trap_emul_vcpu_setup(struct kvm_vcpu *vcpu) kvm_write_c0_guest_ebase(cop0, KVM_GUEST_KSEG0 | (vcpu_id & MIPS_EBASE_CPUNUM)); + /* Put PC at guest reset vector */ + vcpu->arch.pc = KVM_GUEST_CKSEG1ADDR(0x1fc00000); + return 0; } -- GitLab