From ad58d4d4a274e9290725188c557d16e7d0cd1b3d Mon Sep 17 00:00:00 2001 From: James Hogan Date: Mon, 2 Feb 2015 22:55:17 +0000 Subject: [PATCH] KVM: MIPS/T&E: Expose read-only CP0_IntCtl register MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Expose the CP0_IntCtl register through the KVM register access API, which is a required register since MIPS32r2. It is currently read-only since the VS field isn't implemented due to lack of Config3.VInt or Config3.VEIC. It is implemented in trap_emul.c so that a VZ implementation can allow writes. 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 --- Documentation/virtual/kvm/api.txt | 1 + arch/mips/include/asm/kvm_host.h | 1 + arch/mips/kvm/trap_emul.c | 7 +++++++ 3 files changed, 9 insertions(+) diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index df4a309ba56e..d34b03c99233 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -2073,6 +2073,7 @@ registers, find a list below: MIPS | KVM_REG_MIPS_CP0_ENTRYHI | 64 MIPS | KVM_REG_MIPS_CP0_COMPARE | 32 MIPS | KVM_REG_MIPS_CP0_STATUS | 32 + MIPS | KVM_REG_MIPS_CP0_INTCTL | 32 MIPS | KVM_REG_MIPS_CP0_CAUSE | 32 MIPS | KVM_REG_MIPS_CP0_EPC | 64 MIPS | KVM_REG_MIPS_CP0_PRID | 32 diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h index 66459ca4af81..ebcc55963941 100644 --- a/arch/mips/include/asm/kvm_host.h +++ b/arch/mips/include/asm/kvm_host.h @@ -43,6 +43,7 @@ #define KVM_REG_MIPS_CP0_ENTRYHI MIPS_CP0_64(10, 0) #define KVM_REG_MIPS_CP0_COMPARE MIPS_CP0_32(11, 0) #define KVM_REG_MIPS_CP0_STATUS MIPS_CP0_32(12, 0) +#define KVM_REG_MIPS_CP0_INTCTL MIPS_CP0_32(12, 1) #define KVM_REG_MIPS_CP0_CAUSE MIPS_CP0_32(13, 0) #define KVM_REG_MIPS_CP0_EPC MIPS_CP0_64(14, 0) #define KVM_REG_MIPS_CP0_PRID MIPS_CP0_32(15, 0) diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 2f9e44b0f177..b1fa53b252ea 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -658,6 +658,7 @@ static u64 kvm_trap_emul_get_one_regs[] = { KVM_REG_MIPS_CP0_ENTRYHI, KVM_REG_MIPS_CP0_COMPARE, KVM_REG_MIPS_CP0_STATUS, + KVM_REG_MIPS_CP0_INTCTL, KVM_REG_MIPS_CP0_CAUSE, KVM_REG_MIPS_CP0_EPC, KVM_REG_MIPS_CP0_PRID, @@ -741,6 +742,9 @@ static int kvm_trap_emul_get_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_STATUS: *v = (long)kvm_read_c0_guest_status(cop0); break; + case KVM_REG_MIPS_CP0_INTCTL: + *v = (long)kvm_read_c0_guest_intctl(cop0); + break; case KVM_REG_MIPS_CP0_CAUSE: *v = (long)kvm_read_c0_guest_cause(cop0); break; @@ -855,6 +859,9 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, case KVM_REG_MIPS_CP0_STATUS: kvm_write_c0_guest_status(cop0, v); break; + case KVM_REG_MIPS_CP0_INTCTL: + /* No VInt, so no VS, read-only for now */ + break; case KVM_REG_MIPS_CP0_EPC: kvm_write_c0_guest_epc(cop0, v); break; -- 2.20.1