1 files changed, 148 insertions, 43 deletions

diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 8d7d381737ee..dc3f76f6e46c 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -17,8 +17,8 @@
 #include <linux/sched/signal.h>
 #include <linux/fs.h>
 #include <linux/kvm_host.h>
-#include <asm/csr.h>
 #include <asm/cacheflush.h>
+#include <asm/kvm_nacl.h>
 #include <asm/kvm_vcpu_vector.h>
 
 #define CREATE_TRACE_POINTS
@@ -226,6 +226,13 @@ bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
 	return (vcpu->arch.guest_context.sstatus & SR_SPP) ? true : false;
 }
 
+#ifdef CONFIG_GUEST_PERF_EVENTS
+unsigned long kvm_arch_vcpu_get_ip(struct kvm_vcpu *vcpu)
+{
+	return vcpu->arch.guest_context.sepc;
+}
+#endif
+
 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
 {
 	return VM_FAULT_SIGBUS;
@@ -361,10 +368,10 @@ void kvm_riscv_vcpu_sync_interrupts(struct kvm_vcpu *vcpu)
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 
 	/* Read current HVIP and VSIE CSRs */
-	csr->vsie = csr_read(CSR_VSIE);
+	csr->vsie = ncsr_read(CSR_VSIE);
 
 	/* Sync-up HVIP.VSSIP bit changes does by Guest */
-	hvip = csr_read(CSR_HVIP);
+	hvip = ncsr_read(CSR_HVIP);
 	if ((csr->hvip ^ hvip) & (1UL << IRQ_VS_SOFT)) {
 		if (hvip & (1UL << IRQ_VS_SOFT)) {
 			if (!test_and_set_bit(IRQ_VS_SOFT,
@@ -561,26 +568,49 @@ static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu)
 
 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 {
+	void *nsh;
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 	struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
 
-	csr_write(CSR_VSSTATUS, csr->vsstatus);
-	csr_write(CSR_VSIE, csr->vsie);
-	csr_write(CSR_VSTVEC, csr->vstvec);
-	csr_write(CSR_VSSCRATCH, csr->vsscratch);
-	csr_write(CSR_VSEPC, csr->vsepc);
-	csr_write(CSR_VSCAUSE, csr->vscause);
-	csr_write(CSR_VSTVAL, csr->vstval);
-	csr_write(CSR_HEDELEG, cfg->hedeleg);
-	csr_write(CSR_HVIP, csr->hvip);
-	csr_write(CSR_VSATP, csr->vsatp);
-	csr_write(CSR_HENVCFG, cfg->henvcfg);
-	if (IS_ENABLED(CONFIG_32BIT))
-		csr_write(CSR_HENVCFGH, cfg->henvcfg >> 32);
-	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
-		csr_write(CSR_HSTATEEN0, cfg->hstateen0);
+	if (kvm_riscv_nacl_sync_csr_available()) {
+		nsh = nacl_shmem();
+		nacl_csr_write(nsh, CSR_VSSTATUS, csr->vsstatus);
+		nacl_csr_write(nsh, CSR_VSIE, csr->vsie);
+		nacl_csr_write(nsh, CSR_VSTVEC, csr->vstvec);
+		nacl_csr_write(nsh, CSR_VSSCRATCH, csr->vsscratch);
+		nacl_csr_write(nsh, CSR_VSEPC, csr->vsepc);
+		nacl_csr_write(nsh, CSR_VSCAUSE, csr->vscause);
+		nacl_csr_write(nsh, CSR_VSTVAL, csr->vstval);
+		nacl_csr_write(nsh, CSR_HEDELEG, cfg->hedeleg);
+		nacl_csr_write(nsh, CSR_HVIP, csr->hvip);
+		nacl_csr_write(nsh, CSR_VSATP, csr->vsatp);
+		nacl_csr_write(nsh, CSR_HENVCFG, cfg->henvcfg);
 		if (IS_ENABLED(CONFIG_32BIT))
-			csr_write(CSR_HSTATEEN0H, cfg->hstateen0 >> 32);
+			nacl_csr_write(nsh, CSR_HENVCFGH, cfg->henvcfg >> 32);
+		if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
+			nacl_csr_write(nsh, CSR_HSTATEEN0, cfg->hstateen0);
+			if (IS_ENABLED(CONFIG_32BIT))
+				nacl_csr_write(nsh, CSR_HSTATEEN0H, cfg->hstateen0 >> 32);
+		}
+	} else {
+		csr_write(CSR_VSSTATUS, csr->vsstatus);
+		csr_write(CSR_VSIE, csr->vsie);
+		csr_write(CSR_VSTVEC, csr->vstvec);
+		csr_write(CSR_VSSCRATCH, csr->vsscratch);
+		csr_write(CSR_VSEPC, csr->vsepc);
+		csr_write(CSR_VSCAUSE, csr->vscause);
+		csr_write(CSR_VSTVAL, csr->vstval);
+		csr_write(CSR_HEDELEG, cfg->hedeleg);
+		csr_write(CSR_HVIP, csr->hvip);
+		csr_write(CSR_VSATP, csr->vsatp);
+		csr_write(CSR_HENVCFG, cfg->henvcfg);
+		if (IS_ENABLED(CONFIG_32BIT))
+			csr_write(CSR_HENVCFGH, cfg->henvcfg >> 32);
+		if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
+			csr_write(CSR_HSTATEEN0, cfg->hstateen0);
+			if (IS_ENABLED(CONFIG_32BIT))
+				csr_write(CSR_HSTATEEN0H, cfg->hstateen0 >> 32);
+		}
 	}
 
 	kvm_riscv_gstage_update_hgatp(vcpu);
@@ -603,6 +633,7 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
 
 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 {
+	void *nsh;
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 
 	vcpu->cpu = -1;
@@ -618,15 +649,28 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
 					 vcpu->arch.isa);
 	kvm_riscv_vcpu_host_vector_restore(&vcpu->arch.host_context);
 
-	csr->vsstatus = csr_read(CSR_VSSTATUS);
-	csr->vsie = csr_read(CSR_VSIE);
-	csr->vstvec = csr_read(CSR_VSTVEC);
-	csr->vsscratch = csr_read(CSR_VSSCRATCH);
-	csr->vsepc = csr_read(CSR_VSEPC);
-	csr->vscause = csr_read(CSR_VSCAUSE);
-	csr->vstval = csr_read(CSR_VSTVAL);
-	csr->hvip = csr_read(CSR_HVIP);
-	csr->vsatp = csr_read(CSR_VSATP);
+	if (kvm_riscv_nacl_available()) {
+		nsh = nacl_shmem();
+		csr->vsstatus = nacl_csr_read(nsh, CSR_VSSTATUS);
+		csr->vsie = nacl_csr_read(nsh, CSR_VSIE);
+		csr->vstvec = nacl_csr_read(nsh, CSR_VSTVEC);
+		csr->vsscratch = nacl_csr_read(nsh, CSR_VSSCRATCH);
+		csr->vsepc = nacl_csr_read(nsh, CSR_VSEPC);
+		csr->vscause = nacl_csr_read(nsh, CSR_VSCAUSE);
+		csr->vstval = nacl_csr_read(nsh, CSR_VSTVAL);
+		csr->hvip = nacl_csr_read(nsh, CSR_HVIP);
+		csr->vsatp = nacl_csr_read(nsh, CSR_VSATP);
+	} else {
+		csr->vsstatus = csr_read(CSR_VSSTATUS);
+		csr->vsie = csr_read(CSR_VSIE);
+		csr->vstvec = csr_read(CSR_VSTVEC);
+		csr->vsscratch = csr_read(CSR_VSSCRATCH);
+		csr->vsepc = csr_read(CSR_VSEPC);
+		csr->vscause = csr_read(CSR_VSCAUSE);
+		csr->vstval = csr_read(CSR_VSTVAL);
+		csr->hvip = csr_read(CSR_HVIP);
+		csr->vsatp = csr_read(CSR_VSATP);
+	}
 }
 
 static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
@@ -681,7 +725,7 @@ static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu)
 {
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 
-	csr_write(CSR_HVIP, csr->hvip);
+	ncsr_write(CSR_HVIP, csr->hvip);
 	kvm_riscv_vcpu_aia_update_hvip(vcpu);
 }
 
@@ -691,6 +735,7 @@ static __always_inline void kvm_riscv_vcpu_swap_in_guest_state(struct kvm_vcpu *
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 	struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
 
+	vcpu->arch.host_scounteren = csr_swap(CSR_SCOUNTEREN, csr->scounteren);
 	vcpu->arch.host_senvcfg = csr_swap(CSR_SENVCFG, csr->senvcfg);
 	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN) &&
 	    (cfg->hstateen0 & SMSTATEEN0_SSTATEEN0))
@@ -704,6 +749,7 @@ static __always_inline void kvm_riscv_vcpu_swap_in_host_state(struct kvm_vcpu *v
 	struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
 	struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
 
+	csr->scounteren = csr_swap(CSR_SCOUNTEREN, vcpu->arch.host_scounteren);
 	csr->senvcfg = csr_swap(CSR_SENVCFG, vcpu->arch.host_senvcfg);
 	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN) &&
 	    (cfg->hstateen0 & SMSTATEEN0_SSTATEEN0))
@@ -718,11 +764,81 @@ static __always_inline void kvm_riscv_vcpu_swap_in_host_state(struct kvm_vcpu *v
  * This must be noinstr as instrumentation may make use of RCU, and this is not
  * safe during the EQS.
  */
-static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu)
+static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu,
+					      struct kvm_cpu_trap *trap)
 {
+	void *nsh;
+	struct kvm_cpu_context *gcntx = &vcpu->arch.guest_context;
+	struct kvm_cpu_context *hcntx = &vcpu->arch.host_context;
+
+	/*
+	 * We save trap CSRs (such as SEPC, SCAUSE, STVAL, HTVAL, and
+	 * HTINST) here because we do local_irq_enable() after this
+	 * function in kvm_arch_vcpu_ioctl_run() which can result in
+	 * an interrupt immediately after local_irq_enable() and can
+	 * potentially change trap CSRs.
+	 */
+
 	kvm_riscv_vcpu_swap_in_guest_state(vcpu);
 	guest_state_enter_irqoff();
-	__kvm_riscv_switch_to(&vcpu->arch);
+
+	if (kvm_riscv_nacl_sync_sret_available()) {
+		nsh = nacl_shmem();
+
+		if (kvm_riscv_nacl_autoswap_csr_available()) {
+			hcntx->hstatus =
+				nacl_csr_read(nsh, CSR_HSTATUS);
+			nacl_scratch_write_long(nsh,
+						SBI_NACL_SHMEM_AUTOSWAP_OFFSET +
+						SBI_NACL_SHMEM_AUTOSWAP_HSTATUS,
+						gcntx->hstatus);
+			nacl_scratch_write_long(nsh,
+						SBI_NACL_SHMEM_AUTOSWAP_OFFSET,
+						SBI_NACL_SHMEM_AUTOSWAP_FLAG_HSTATUS);
+		} else if (kvm_riscv_nacl_sync_csr_available()) {
+			hcntx->hstatus = nacl_csr_swap(nsh,
+						       CSR_HSTATUS, gcntx->hstatus);
+		} else {
+			hcntx->hstatus = csr_swap(CSR_HSTATUS, gcntx->hstatus);
+		}
+
+		nacl_scratch_write_longs(nsh,
+					 SBI_NACL_SHMEM_SRET_OFFSET +
+					 SBI_NACL_SHMEM_SRET_X(1),
+					 &gcntx->ra,
+					 SBI_NACL_SHMEM_SRET_X_LAST);
+
+		__kvm_riscv_nacl_switch_to(&vcpu->arch, SBI_EXT_NACL,
+					   SBI_EXT_NACL_SYNC_SRET);
+
+		if (kvm_riscv_nacl_autoswap_csr_available()) {
+			nacl_scratch_write_long(nsh,
+						SBI_NACL_SHMEM_AUTOSWAP_OFFSET,
+						0);
+			gcntx->hstatus = nacl_scratch_read_long(nsh,
+								SBI_NACL_SHMEM_AUTOSWAP_OFFSET +
+								SBI_NACL_SHMEM_AUTOSWAP_HSTATUS);
+		} else {
+			gcntx->hstatus = csr_swap(CSR_HSTATUS, hcntx->hstatus);
+		}
+
+		trap->htval = nacl_csr_read(nsh, CSR_HTVAL);
+		trap->htinst = nacl_csr_read(nsh, CSR_HTINST);
+	} else {
+		hcntx->hstatus = csr_swap(CSR_HSTATUS, gcntx->hstatus);
+
+		__kvm_riscv_switch_to(&vcpu->arch);
+
+		gcntx->hstatus = csr_swap(CSR_HSTATUS, hcntx->hstatus);
+
+		trap->htval = csr_read(CSR_HTVAL);
+		trap->htinst = csr_read(CSR_HTINST);
+	}
+
+	trap->sepc = gcntx->sepc;
+	trap->scause = csr_read(CSR_SCAUSE);
+	trap->stval = csr_read(CSR_STVAL);
+
 	vcpu->arch.last_exit_cpu = vcpu->cpu;
 	guest_state_exit_irqoff();
 	kvm_riscv_vcpu_swap_in_host_state(vcpu);
@@ -839,22 +955,11 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 
 		guest_timing_enter_irqoff();
 
-		kvm_riscv_vcpu_enter_exit(vcpu);
+		kvm_riscv_vcpu_enter_exit(vcpu, &trap);
 
 		vcpu->mode = OUTSIDE_GUEST_MODE;
 		vcpu->stat.exits++;
 
-		/*
-		 * Save SCAUSE, STVAL, HTVAL, and HTINST because we might
-		 * get an interrupt between __kvm_riscv_switch_to() and
-		 * local_irq_enable() which can potentially change CSRs.
-		 */
-		trap.sepc = vcpu->arch.guest_context.sepc;
-		trap.scause = csr_read(CSR_SCAUSE);
-		trap.stval = csr_read(CSR_STVAL);
-		trap.htval = csr_read(CSR_HTVAL);
-		trap.htinst = csr_read(CSR_HTINST);
-
 		/* Syncup interrupts state with HW */
 		kvm_riscv_vcpu_sync_interrupts(vcpu);