linux-kernel - [PATCH v5 08/12] virt: geniezone: Add memory region support

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Message-ID: <20230727080005.14474-9-yi-de.wu@mediatek.com>
Date:   Thu, 27 Jul 2023 16:00:01 +0800
From:   Yi-De Wu <yi-de.wu@...iatek.com>
To:     Yingshiuan Pan <yingshiuan.pan@...iatek.com>,
        Ze-Yu Wang <ze-yu.wang@...iatek.com>,
        Yi-De Wu <yi-de.wu@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-doc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-arch@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        David Bradil <dbrazdil@...gle.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Ivan Tseng <ivan.tseng@...iatek.com>,
        Jade Shih <jades.shih@...iatek.com>,
        My Chuang <my.chuang@...iatek.com>,
        Shawn Hsiao <shawn.hsiao@...iatek.com>,
        PeiLun Suei <peilun.suei@...iatek.com>,
        Liju Chen <liju-clr.chen@...iatek.com>,
        Willix Yeh <chi-shen.yeh@...iatek.com>
Subject: [PATCH v5 08/12] virt: geniezone: Add memory region support

From: "Jerry Wang" <ze-yu.wang@...iatek.com>

Hypervisor might need to know the precise purpose of each memory
region, so that it can provide specific memory protection. We add a new
uapi to pass address and size of a memory region and its purpose.

Signed-off-by: Jerry Wang <ze-yu.wang@...iatek.com>
Signed-off-by: Liju-clr Chen <liju-clr.chen@...iatek.com>
Signed-off-by: Yi-De Wu <yi-de.wu@...iatek.com>
---
 arch/arm64/geniezone/gzvm_arch_common.h |  2 ++
 arch/arm64/geniezone/vm.c               | 10 ++++++++++
 drivers/virt/geniezone/gzvm_vm.c        |  7 +++++++
 include/linux/gzvm_drv.h                |  3 +++
 4 files changed, 22 insertions(+)

diff --git a/arch/arm64/geniezone/gzvm_arch_common.h b/arch/arm64/geniezone/gzvm_arch_common.h
index 051d8f49a1df..321f5dbcd616 100644
--- a/arch/arm64/geniezone/gzvm_arch_common.h
+++ b/arch/arm64/geniezone/gzvm_arch_common.h
@@ -22,6 +22,7 @@ enum {
 	GZVM_FUNC_PROBE = 12,
 	GZVM_FUNC_ENABLE_CAP = 13,
 	GZVM_FUNC_INFORM_EXIT = 14,
+	GZVM_FUNC_MEMREGION_PURPOSE = 15,
 	NR_GZVM_FUNC,
 };
 
@@ -44,6 +45,7 @@ enum {
 #define MT_HVC_GZVM_PROBE		GZVM_HCALL_ID(GZVM_FUNC_PROBE)
 #define MT_HVC_GZVM_ENABLE_CAP		GZVM_HCALL_ID(GZVM_FUNC_ENABLE_CAP)
 #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 GIC_V3_NR_LRS			16
 
diff --git a/arch/arm64/geniezone/vm.c b/arch/arm64/geniezone/vm.c
index 2df321f13057..17327081eb27 100644
--- a/arch/arm64/geniezone/vm.c
+++ b/arch/arm64/geniezone/vm.c
@@ -109,6 +109,16 @@ int gzvm_arch_destroy_vm(u16 vm_id)
 				    0, 0, &res);
 }
 
+int gzvm_arch_memregion_purpose(struct gzvm *gzvm,
+				struct gzvm_userspace_memory_region *mem)
+{
+	struct arm_smccc_res res;
+
+	return gzvm_hypcall_wrapper(MT_HVC_GZVM_MEMREGION_PURPOSE, gzvm->vm_id,
+				    mem->guest_phys_addr, mem->memory_size,
+				    mem->flags, 0, 0, 0, &res);
+}
+
 static int gzvm_vm_arch_enable_cap(struct gzvm *gzvm,
 				   struct gzvm_enable_cap *cap,
 				   struct arm_smccc_res *res)
diff --git a/drivers/virt/geniezone/gzvm_vm.c b/drivers/virt/geniezone/gzvm_vm.c
index 60bd017e41fa..a1cf970e4c91 100644
--- a/drivers/virt/geniezone/gzvm_vm.c
+++ b/drivers/virt/geniezone/gzvm_vm.c
@@ -234,6 +234,7 @@ static int
 gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
 				struct gzvm_userspace_memory_region *mem)
 {
+	int ret;
 	struct vm_area_struct *vma;
 	struct gzvm_memslot *memslot;
 	unsigned long size;
@@ -258,6 +259,12 @@ gzvm_vm_ioctl_set_memory_region(struct gzvm *gzvm,
 	memslot->vma = vma;
 	memslot->flags = mem->flags;
 	memslot->slot_id = mem->slot;
+
+	ret = gzvm_arch_memregion_purpose(gzvm, mem);
+	if (ret) {
+		pr_err("Failed to config memory region for the specified purpose\n");
+		return -EFAULT;
+	}
 	return register_memslot_addr_range(gzvm, memslot);
 }
 
diff --git a/include/linux/gzvm_drv.h b/include/linux/gzvm_drv.h
index d2985e4df4a0..369c3df6c0b5 100644
--- a/include/linux/gzvm_drv.h
+++ b/include/linux/gzvm_drv.h
@@ -141,6 +141,9 @@ void gzvm_drv_irqfd_exit(void);
 int gzvm_vm_irqfd_init(struct gzvm *gzvm);
 void gzvm_vm_irqfd_release(struct gzvm *gzvm);
 
+int gzvm_arch_memregion_purpose(struct gzvm *gzvm,
+				struct gzvm_userspace_memory_region *mem);
+
 int gzvm_init_ioeventfd(struct gzvm *gzvm);
 int gzvm_ioeventfd(struct gzvm *gzvm, struct gzvm_ioeventfd *args);
 bool gzvm_ioevent_write(struct gzvm_vcpu *vcpu, __u64 addr, int len,
-- 
2.18.0