KVM: MIPS: Implement VZ support

Add the main support for the MIPS Virtualization ASE (A.K.A. VZ) to MIPS
KVM. The bulk of this work is in vz.c, with various new state and
definitions elsewhere.

Enough is implemented to be able to run on a minimal VZ core. Further
patches will fill out support for guest features which are optional or
can be disabled.

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: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org
Cc: linux-doc@vger.kernel.org

2 files changed, 43 insertions, 0 deletions

diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h
index 4113796e0ef4..be3b4c25f335 100644
--- a/arch/mips/include/asm/cpu-info.h
+++ b/arch/mips/include/asm/cpu-info.h
@@ -110,6 +110,7 @@ struct cpuinfo_mips {
 	struct guest_info	guest;
 	unsigned int		gtoffset_mask;
 	unsigned int		guestid_mask;
+	unsigned int		guestid_cache;
 } __attribute__((aligned(SMP_CACHE_BYTES)));
 
 extern struct cpuinfo_mips cpu_data[];
diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
index b47571850aac..bc3f9dedaac8 100644
--- a/arch/mips/include/asm/kvm_host.h
+++ b/arch/mips/include/asm/kvm_host.h
@@ -10,6 +10,7 @@
 #ifndef __MIPS_KVM_HOST_H__
 #define __MIPS_KVM_HOST_H__
 
+#include <linux/cpumask.h>
 #include <linux/mutex.h>
 #include <linux/hrtimer.h>
 #include <linux/interrupt.h>
@@ -73,6 +74,11 @@
 #define KVM_COALESCED_MMIO_PAGE_OFFSET 1
 #define KVM_HALT_POLL_NS_DEFAULT 500000
 
+#ifdef CONFIG_KVM_MIPS_VZ
+extern unsigned long GUESTID_MASK;
+extern unsigned long GUESTID_FIRST_VERSION;
+extern unsigned long GUESTID_VERSION_MASK;
+#endif
 
 
 /*
@@ -167,6 +173,8 @@ struct kvm_arch_memory_slot {
 struct kvm_arch {
 	/* Guest physical mm */
 	struct mm_struct gpa_mm;
+	/* Mask of CPUs needing GPA ASID flush */
+	cpumask_t asid_flush_mask;
 };
 
 #define N_MIPS_COPROC_REGS	32
@@ -224,6 +232,11 @@ struct mips_coproc {
 #define MIPS_CP0_CONFIG4_SEL	4
 #define MIPS_CP0_CONFIG5_SEL	5
 
+#define MIPS_CP0_GUESTCTL2	10
+#define MIPS_CP0_GUESTCTL2_SEL	5
+#define MIPS_CP0_GTOFFSET	12
+#define MIPS_CP0_GTOFFSET_SEL	7
+
 /* Resume Flags */
 #define RESUME_FLAG_DR		(1<<0)	/* Reload guest nonvolatile state? */
 #define RESUME_FLAG_HOST	(1<<1)	/* Resume host? */
@@ -356,7 +369,20 @@ struct kvm_vcpu_arch {
 	/* Cache some mmu pages needed inside spinlock regions */
 	struct kvm_mmu_memory_cache mmu_page_cache;
 
+#ifdef CONFIG_KVM_MIPS_VZ
+	/* vcpu's vzguestid is different on each host cpu in an smp system */
+	u32 vzguestid[NR_CPUS];
+
+	/* wired guest TLB entries */
+	struct kvm_mips_tlb *wired_tlb;
+	unsigned int wired_tlb_limit;
+	unsigned int wired_tlb_used;
+#endif
+
+	/* Last CPU the VCPU state was loaded on */
 	int last_sched_cpu;
+	/* Last CPU the VCPU actually executed guest code on */
+	int last_exec_cpu;
 
 	/* WAIT executed */
 	int wait;
@@ -660,6 +686,7 @@ __BUILD_KVM_RW_HW(config4,        32, MIPS_CP0_CONFIG,       4)
 __BUILD_KVM_RW_HW(config5,        32, MIPS_CP0_CONFIG,       5)
 __BUILD_KVM_RW_HW(config6,        32, MIPS_CP0_CONFIG,       6)
 __BUILD_KVM_RW_HW(config7,        32, MIPS_CP0_CONFIG,       7)
+__BUILD_KVM_RW_HW(xcontext,       l,  MIPS_CP0_TLB_XCONTEXT, 0)
 __BUILD_KVM_RW_HW(errorepc,       l,  MIPS_CP0_ERROR_PC,     0)
 __BUILD_KVM_RW_HW(kscratch1,      l,  MIPS_CP0_DESAVE,       2)
 __BUILD_KVM_RW_HW(kscratch2,      l,  MIPS_CP0_DESAVE,       3)
@@ -674,6 +701,14 @@ __BUILD_KVM_SET_HW(status,        32, MIPS_CP0_STATUS,       0)
 __BUILD_KVM_ATOMIC_HW(cause,      32, MIPS_CP0_CAUSE,        0)
 __BUILD_KVM_SET_HW(ebase,         l,  MIPS_CP0_PRID,         1)
 
+/* Bitwise operations (on saved state) */
+__BUILD_KVM_SET_SAVED(config,     32, MIPS_CP0_CONFIG,       0)
+__BUILD_KVM_SET_SAVED(config1,    32, MIPS_CP0_CONFIG,       1)
+__BUILD_KVM_SET_SAVED(config2,    32, MIPS_CP0_CONFIG,       2)
+__BUILD_KVM_SET_SAVED(config3,    32, MIPS_CP0_CONFIG,       3)
+__BUILD_KVM_SET_SAVED(config4,    32, MIPS_CP0_CONFIG,       4)
+__BUILD_KVM_SET_SAVED(config5,    32, MIPS_CP0_CONFIG,       5)
+
 /* Helpers */
 
 static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu)
@@ -786,6 +821,10 @@ u32 kvm_get_user_asid(struct kvm_vcpu *vcpu);
 
 u32 kvm_get_commpage_asid (struct kvm_vcpu *vcpu);
 
+#ifdef CONFIG_KVM_MIPS_VZ
+int kvm_mips_handle_vz_root_tlb_fault(unsigned long badvaddr,
+				      struct kvm_vcpu *vcpu, bool write_fault);
+#endif
 extern int kvm_mips_handle_kseg0_tlb_fault(unsigned long badbaddr,
 					   struct kvm_vcpu *vcpu,
 					   bool write_fault);
@@ -1026,6 +1065,9 @@ enum emulation_result kvm_mips_emulate_load(union mips_instruction inst,
 					    struct kvm_run *run,
 					    struct kvm_vcpu *vcpu);
 
+/* COP0 */
+enum emulation_result kvm_mips_emul_wait(struct kvm_vcpu *vcpu);
+
 unsigned int kvm_mips_config1_wrmask(struct kvm_vcpu *vcpu);
 unsigned int kvm_mips_config3_wrmask(struct kvm_vcpu *vcpu);
 unsigned int kvm_mips_config4_wrmask(struct kvm_vcpu *vcpu);