KVM: MIPS: Add fast path TLB refill handler

Use functions from the general MIPS TLB exception vector generation code
(tlbex.c) to construct a fast path TLB refill handler similar to the
general one, but cut down and capable of preserving K0 and K1.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: kvm@vger.kernel.org

1 files changed, 78 insertions, 0 deletions

diff --git a/arch/mips/kvm/entry.c b/arch/mips/kvm/entry.c
index 7424d3d566ff..1ae33e0e675c 100644
--- a/arch/mips/kvm/entry.c
+++ b/arch/mips/kvm/entry.c
@@ -16,6 +16,7 @@
 #include <asm/mmu_context.h>
 #include <asm/msa.h>
 #include <asm/setup.h>
+#include <asm/tlbex.h>
 #include <asm/uasm.h>
 
 /* Register names */
@@ -122,6 +123,9 @@ int kvm_mips_entry_setup(void)
 	 */
 	unsigned int kscratch_mask = cpu_data[0].kscratch_mask;
 
+	if (pgd_reg != -1)
+		kscratch_mask &= ~BIT(pgd_reg);
+
 	/* Pick a scratch register for storing VCPU */
 	if (kscratch_mask) {
 		scratch_vcpu[0] = c0_kscratch();
@@ -381,6 +385,80 @@ static void *kvm_mips_build_enter_guest(void *addr)
 }
 
 /**
+ * kvm_mips_build_tlb_refill_exception() - Assemble TLB refill handler.
+ * @addr:	Address to start writing code.
+ * @handler:	Address of common handler (within range of @addr).
+ *
+ * Assemble TLB refill exception fast path handler for guest execution.
+ *
+ * Returns:	Next address after end of written function.
+ */
+void *kvm_mips_build_tlb_refill_exception(void *addr, void *handler)
+{
+	u32 *p = addr;
+	struct uasm_label labels[2];
+	struct uasm_reloc relocs[2];
+	struct uasm_label *l = labels;
+	struct uasm_reloc *r = relocs;
+
+	memset(labels, 0, sizeof(labels));
+	memset(relocs, 0, sizeof(relocs));
+
+	/* Save guest k1 into scratch register */
+	UASM_i_MTC0(&p, K1, scratch_tmp[0], scratch_tmp[1]);
+
+	/* Get the VCPU pointer from the VCPU scratch register */
+	UASM_i_MFC0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]);
+
+	/* Save guest k0 into VCPU structure */
+	UASM_i_SW(&p, K0, offsetof(struct kvm_vcpu, arch.gprs[K0]), K1);
+
+	/*
+	 * Some of the common tlbex code uses current_cpu_type(). For KVM we
+	 * assume symmetry and just disable preemption to silence the warning.
+	 */
+	preempt_disable();
+
+	/*
+	 * Now for the actual refill bit. A lot of this can be common with the
+	 * Linux TLB refill handler, however we don't need to handle so many
+	 * cases. We only need to handle user mode refills, and user mode runs
+	 * with 32-bit addressing.
+	 *
+	 * Therefore the branch to label_vmalloc generated by build_get_pmde64()
+	 * that isn't resolved should never actually get taken and is harmless
+	 * to leave in place for now.
+	 */
+
+#ifdef CONFIG_64BIT
+	build_get_pmde64(&p, &l, &r, K0, K1); /* get pmd in K1 */
+#else
+	build_get_pgde32(&p, K0, K1); /* get pgd in K1 */
+#endif
+
+	/* we don't support huge pages yet */
+
+	build_get_ptep(&p, K0, K1);
+	build_update_entries(&p, K0, K1);
+	build_tlb_write_entry(&p, &l, &r, tlb_random);
+
+	preempt_enable();
+
+	/* Get the VCPU pointer from the VCPU scratch register again */
+	UASM_i_MFC0(&p, K1, scratch_vcpu[0], scratch_vcpu[1]);
+
+	/* Restore the guest's k0/k1 registers */
+	UASM_i_LW(&p, K0, offsetof(struct kvm_vcpu, arch.gprs[K0]), K1);
+	uasm_i_ehb(&p);
+	UASM_i_MFC0(&p, K1, scratch_tmp[0], scratch_tmp[1]);
+
+	/* Jump to guest */
+	uasm_i_eret(&p);
+
+	return p;
+}
+
+/**
  * kvm_mips_build_exception() - Assemble first level guest exception handler.
  * @addr:	Address to start writing code.
  * @handler:	Address of common handler (within range of @addr).