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From: Yi-De Wu <yi-de.wu@mediatek.com>
To: Yingshiuan Pan <yingshiuan.pan@mediatek.com>, Ze-Yu Wang
	<ze-yu.wang@mediatek.com>, Yi-De Wu <yi-de.wu@mediatek.com>, Rob Herring
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	Wihl Deacon <will@kernel.org>, Steven Rostedt <rostedt@goodmis.org>, Masami
 Hiramatsu <mhiramat@kernel.org>, Mathieu Desnoyers
	<mathieu.desnoyers@efficios.com>, Richard Cochran <richardcochran@gmail.com>,
	Matthias Brugger <matthias.bgg@gmail.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>
CC: <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-doc@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>,
	<linux-trace-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>, David Bradil <dbrazdil@google.com>,
	Trilok Soni <quic_tsoni@quicinc.com>, Jade Shih <jades.shih@mediatek.com>,
	Ivan Tseng <ivan.tseng@mediatek.com>, My Chuang <my.chuang@mediatek.com>,
	Shawn Hsiao <shawn.hsiao@mediatek.com>, PeiLun Suei
	<peilun.suei@mediatek.com>, Liju Chen <liju-clr.chen@mediatek.com>, Willix
 Yeh <chi-shen.yeh@mediatek.com>, Kevenny Hsieh <kevenny.hsieh@mediatek.com>
Subject: [PATCH v8 14/20] virt: geniezone: Add demand paging support
Date: Thu, 28 Dec 2023 18:51:41 +0800
Message-ID: <20231228105147.13752-15-yi-de.wu@mediatek.com>
In-Reply-To: <20231228105147.13752-1-yi-de.wu@mediatek.com>
References: <20231228105147.13752-1-yi-de.wu@mediatek.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain

From: "Yingshiuan Pan" <yingshiuan.pan@mediatek.com>

This page fault handler helps GenieZone hypervisor to do demand paging.
On a lower level translation fault, GenieZone hypervisor will first
check the fault GPA (guest physical address or IPA in ARM) is valid
e.g. within the registered memory region, then it will setup the
vcpu_run->exit_reason with necessary information for returning to
gzvm driver.

With the fault information, the gzvm driver looks up the physical
address and call the MT_HVC_GZVM_MAP_GUEST to request the hypervisor
maps the found PA to the fault GPA (IPA).

There is one exception, for protected vm, we will populate full VM's
memory region in advance in order to improve performance.

Signed-off-by: Yingshiuan Pan <yingshiuan.pan@mediatek.com>
Signed-off-by: Jerry Wang <ze-yu.wang@mediatek.com>
Signed-off-by: kevenny hsieh <kevenny.hsieh@mediatek.com>
Signed-off-by: Liju Chen <liju-clr.chen@mediatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu@mediatek.com>
---
 arch/arm64/geniezone/gzvm_arch_common.h |  2 ++
 arch/arm64/geniezone/vm.c               |  9 ++++++
 drivers/virt/geniezone/Makefile         |  4 +--
 drivers/virt/geniezone/gzvm_exception.c | 39 +++++++++++++++++++++++++
 drivers/virt/geniezone/gzvm_main.c      |  2 ++
 drivers/virt/geniezone/gzvm_mmu.c       | 39 +++++++++++++++++++++++++
 drivers/virt/geniezone/gzvm_vcpu.c      |  6 ++--
 drivers/virt/geniezone/gzvm_vm.c        | 25 ++++++++++++++++
 include/linux/gzvm_drv.h                |  7 +++++
 include/uapi/linux/gzvm.h               | 11 +++++++
 10 files changed, 140 insertions(+), 4 deletions(-)
 create mode 100644 drivers/virt/geniezone/gzvm_exception.c

diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index afb91713fc45..1f0c7a3fede8 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -24,6 +24,7 @@ enum {
 	GZVM_FUNC_INFORM_EXIT = 14,
 	GZVM_FUNC_MEMREGION_PURPOSE = 15,
 	GZVM_FUNC_SET_DTB_CONFIG = 16,
+	GZVM_FUNC_MAP_GUEST = 17,
 	NR_GZVM_FUNC,
 };
 
@@ -48,6 +49,7 @@ enum {
 #define MT_HVC_GZVM_INFORM_EXIT		GZVM_HCALL_ID(GZVM_FUNC_INFORM_EXIT)
 #define MT_HVC_GZVM_MEMREGION_PURPOSE	GZVM_HCALL_ID(GZVM_FUNC_MEMREGION_PURPOSE)
 #define MT_HVC_GZVM_SET_DTB_CONFIG	GZVM_HCALL_ID(GZVM_FUNC_SET_DTB_CONFIG)
+#define MT_HVC_GZVM_MAP_GUEST		GZVM_HCALL_ID(GZVM_FUNC_MAP_GUEST)
 
 #define GIC_V3_NR_LRS			16
 
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index 4ca2ec43b37c..ecc43bcc2705 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -382,3 +382,12 @@ u64 gzvm_hva_to_pa_arch(u64 hva)
 		return GZVM_PA_ERR_BAD;
 	return par;
 }
+
+int gzvm_arch_map_guest(u16 vm_id, int memslot_id, u64 pfn, u64 gfn,
+			u64 nr_pages)
+{
+	struct arm_smccc_res res;
+
+	return gzvm_hypcall_wrapper(MT_HVC_GZVM_MAP_GUEST, vm_id, memslot_id,
+				    pfn, gfn, nr_pages, 0, 0, &res);
+}
diff --git a/drivers/virt/geniezone/Makefile b/drivers/virt/geniezone/Makefile
index 9956f4891df2..2e12870637d5 100644
--- a/drivers/virt/geniezone/Makefile
+++ b/drivers/virt/geniezone/Makefile
@@ -8,5 +8,5 @@ GZVM_DIR ?= ../../../drivers/virt/geniezone
 
 gzvm-y := $(GZVM_DIR)/gzvm_main.o $(GZVM_DIR)/gzvm_vm.o \
 	  $(GZVM_DIR)/gzvm_mmu.o $(GZVM_DIR)/gzvm_vcpu.o \
-	  $(GZVM_DIR)/gzvm_irqfd.o $(GZVM_DIR)/gzvm_ioeventfd.o
-
+	  $(GZVM_DIR)/gzvm_irqfd.o $(GZVM_DIR)/gzvm_ioeventfd.o \
+	  $(GZVM_DIR)/gzvm_exception.o
diff --git a/drivers/virt/geniezone/gzvm_exception.c b/drivers/virt/geniezone/gzvm_exception.c
new file mode 100644
index 000000000000..31fdb4ae8db4
--- /dev/null
+++ b/drivers/virt/geniezone/gzvm_exception.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/device.h>
+#include <linux/gzvm_drv.h>
+
+/**
+ * gzvm_handle_guest_exception() - Handle guest exception
+ * @vcpu: Pointer to struct gzvm_vcpu_run in userspace
+ * Return:
+ * * true - This exception has been processed, no need to back to VMM.
+ * * false - This exception has not been processed, require userspace.
+ */
+bool gzvm_handle_guest_exception(struct gzvm_vcpu *vcpu)
+{
+	int ret;
+
+	for (int i = 0; i < ARRAY_SIZE(vcpu->run->exception.reserved); i++) {
+		if (vcpu->run->exception.reserved[i])
+			return -EINVAL;
+	}
+
+	switch (vcpu->run->exception.exception) {
+	case GZVM_EXCEPTION_PAGE_FAULT:
+		ret = gzvm_handle_page_fault(vcpu);
+		break;
+	case GZVM_EXCEPTION_UNKNOWN:
+		fallthrough;
+	default:
+		ret = -EFAULT;
+	}
+
+	if (!ret)
+		return true;
+	else
+		return false;
+}
diff --git a/drivers/virt/geniezone/gzvm_main.c b/drivers/virt/geniezone/gzvm_main.c
index 4e5d1b83df4a..af5ab8949206 100644
--- a/drivers/virt/geniezone/gzvm_main.c
+++ b/drivers/virt/geniezone/gzvm_main.c
@@ -28,6 +28,8 @@ int gzvm_err_to_errno(unsigned long err)
 		return 0;
 	case ERR_NO_MEMORY:
 		return -ENOMEM;
+	case ERR_INVALID_ARGS:
+		return -EINVAL;
 	case ERR_NOT_SUPPORTED:
 		return -EOPNOTSUPP;
 	case ERR_NOT_IMPLEMENTED:
diff --git a/drivers/virt/geniezone/gzvm_mmu.c b/drivers/virt/geniezone/gzvm_mmu.c
index f24fa7e6d975..e6415baa064d 100644
--- a/drivers/virt/geniezone/gzvm_mmu.c
+++ b/drivers/virt/geniezone/gzvm_mmu.c
@@ -106,3 +106,42 @@ int gzvm_gfn_to_pfn_memslot(struct gzvm_memslot *memslot, u64 gfn,
 
 	return 0;
 }
+
+static int handle_single_demand_page(struct gzvm *vm, int memslot_id, u64 gfn)
+{
+	int ret;
+	u64 pfn;
+
+	ret = gzvm_gfn_to_pfn_memslot(&vm->memslot[memslot_id], gfn, &pfn);
+	if (unlikely(ret))
+		return -EFAULT;
+
+	ret = gzvm_arch_map_guest(vm->vm_id, memslot_id, pfn, gfn, 1);
+	if (unlikely(ret))
+		return -EFAULT;
+
+	return 0;
+}
+
+/**
+ * gzvm_handle_page_fault() - Handle guest page fault, find corresponding page
+ *                            for the faulting gpa
+ * @vcpu: Pointer to struct gzvm_vcpu_run of the faulting vcpu
+ *
+ * Return:
+ * * 0		- Success to handle guest page fault
+ * * -EFAULT	- Failed to map phys addr to guest's GPA
+ */
+int gzvm_handle_page_fault(struct gzvm_vcpu *vcpu)
+{
+	struct gzvm *vm = vcpu->gzvm;
+	int memslot_id;
+	u64 gfn;
+
+	gfn = PHYS_PFN(vcpu->run->exception.fault_gpa);
+	memslot_id = gzvm_find_memslot(vm, gfn);
+	if (unlikely(memslot_id < 0))
+		return -EFAULT;
+
+	return handle_single_demand_page(vm, memslot_id, gfn);
+}
diff --git a/drivers/virt/geniezone/gzvm_vcpu.c b/drivers/virt/geniezone/gzvm_vcpu.c
index 77138e749e9a..455ae2e4285c 100644
--- a/drivers/virt/geniezone/gzvm_vcpu.c
+++ b/drivers/virt/geniezone/gzvm_vcpu.c
@@ -113,9 +113,11 @@ static long gzvm_vcpu_run(struct gzvm_vcpu *vcpu, void __user *argp)
 		 * it's geniezone's responsibility to fill corresponding data
 		 * structure
 		 */
-		case GZVM_EXIT_HYPERCALL:
-			fallthrough;
 		case GZVM_EXIT_EXCEPTION:
+			if (!gzvm_handle_guest_exception(vcpu))
+				need_userspace = true;
+			break;
+		case GZVM_EXIT_HYPERCALL:
 			fallthrough;
 		case GZVM_EXIT_DEBUG:
 			fallthrough;
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
index 538549ef405c..9f7e44521de5 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -23,6 +23,31 @@ u64 gzvm_gfn_to_hva_memslot(struct gzvm_memslot *memslot, u64 gfn)
 	return memslot->userspace_addr + offset * PAGE_SIZE;
 }
 
+/**
+ * gzvm_find_memslot() - Find memslot containing this @gpa
+ * @vm: Pointer to struct gzvm
+ * @gfn: Guest frame number
+ *
+ * Return:
+ * * >=0		- Index of memslot
+ * * -EFAULT		- Not found
+ */
+int gzvm_find_memslot(struct gzvm *vm, u64 gfn)
+{
+	int i;
+
+	for (i = 0; i < GZVM_MAX_MEM_REGION; i++) {
+		if (vm->memslot[i].npages == 0)
+			continue;
+
+		if (gfn >= vm->memslot[i].base_gfn &&
+		    gfn < vm->memslot[i].base_gfn + vm->memslot[i].npages)
+			return i;
+	}
+
+	return -EFAULT;
+}
+
 /**
  * register_memslot_addr_range() - Register memory region to GenieZone
  * @gzvm: Pointer to struct gzvm
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index 43d85dc5d7c0..b9e60fe5dcde 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -29,6 +29,7 @@
  */
 #define NO_ERROR                (0)
 #define ERR_NO_MEMORY           (-5)
+#define ERR_INVALID_ARGS        (-8)
 #define ERR_NOT_SUPPORTED       (-24)
 #define ERR_NOT_IMPLEMENTED     (-27)
 #define ERR_FAULT               (-40)
@@ -123,6 +124,8 @@ int gzvm_arch_set_memregion(u16 vm_id, size_t buf_size,
 int gzvm_arch_check_extension(struct gzvm *gzvm, __u64 cap, void __user *argp);
 int gzvm_arch_create_vm(unsigned long vm_type);
 int gzvm_arch_destroy_vm(u16 vm_id);
+int gzvm_arch_map_guest(u16 vm_id, int memslot_id, u64 pfn, u64 gfn,
+			u64 nr_pages);
 int gzvm_vm_ioctl_arch_enable_cap(struct gzvm *gzvm,
 				  struct gzvm_enable_cap *cap,
 				  void __user *argp);
@@ -141,6 +144,10 @@ int gzvm_arch_vcpu_run(struct gzvm_vcpu *vcpu, __u64 *exit_reason);
 int gzvm_arch_destroy_vcpu(u16 vm_id, int vcpuid);
 int gzvm_arch_inform_exit(u16 vm_id);
 
+int gzvm_find_memslot(struct gzvm *vm, u64 gpa);
+int gzvm_handle_page_fault(struct gzvm_vcpu *vcpu);
+bool gzvm_handle_guest_exception(struct gzvm_vcpu *vcpu);
+
 int gzvm_arch_create_device(u16 vm_id, struct gzvm_create_device *gzvm_dev);
 int gzvm_arch_inject_irq(struct gzvm *gzvm, unsigned int vcpu_idx,
 			 u32 irq, bool level);
diff --git a/include/uapi/linux/gzvm.h b/include/uapi/linux/gzvm.h
index f4f04403d5b3..1f134c55ac2a 100644
--- a/include/uapi/linux/gzvm.h
+++ b/include/uapi/linux/gzvm.h
@@ -185,6 +185,12 @@ enum {
 	GZVM_EXIT_GZ = 0x9292000a,
 };
 
+/* exception definitions of GZVM_EXIT_EXCEPTION */
+enum {
+	GZVM_EXCEPTION_UNKNOWN = 0x0,
+	GZVM_EXCEPTION_PAGE_FAULT = 0x1,
+};
+
 /**
  * struct gzvm_vcpu_run: Same purpose as kvm_run, this struct is
  *			shared between userspace, kernel and
@@ -209,6 +215,9 @@ enum {
  *             Handle exception occurred in VM
  * @exception: Which exception vector
  * @error_code: Exception error codes
+ * @fault_gpa: Fault GPA (guest physical address or IPA in ARM)
+ * @reserved: Future-proof reservation and reset to zero in hypervisor.
+ *            Fill up to the union size, 256 bytes.
  * @hypercall: The nested struct in anonymous union.
  *             Some hypercalls issued from VM must be handled
  * @args: The hypercall's arguments
@@ -255,6 +264,8 @@ struct gzvm_vcpu_run {
 		struct {
 			__u32 exception;
 			__u32 error_code;
+			__u64 fault_gpa;
+			__u64 reserved[30];
 		} exception;
 		/* GZVM_EXIT_HYPERCALL */
 		struct {
-- 
2.18.0