[RFC kvmtool 3/9] arm64: Combine kvm.c

[Oliver Upton <oliver.upton@linux.dev>]

Glue together the ARM common and previously arm64-specific bits into one
source file.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 Makefile                                   |   1 -
 arm/aarch64/include/kvm/kvm-arch.h         |  22 ---
 arm/aarch64/kvm.c                          | 212 ---------------------
 arm/include/{arm-common => kvm}/kvm-arch.h |   4 +
 arm/kvm.c                                  | 210 ++++++++++++++++++++
 5 files changed, 214 insertions(+), 235 deletions(-)
 delete mode 100644 arm/aarch64/include/kvm/kvm-arch.h
 delete mode 100644 arm/aarch64/kvm.c
 rename arm/include/{arm-common => kvm}/kvm-arch.h (97%)

diff --git a/Makefile b/Makefile
index cf50cf7..72027e0 100644
--- a/Makefile
+++ b/Makefile
@@ -180,7 +180,6 @@ ifeq ($(ARCH), arm64)
 	OBJS		+= hw/serial.o
 	OBJS		+= arm/arm-cpu.o
 	OBJS		+= arm/aarch64/kvm-cpu.o
-	OBJS		+= arm/aarch64/kvm.o
 	OBJS		+= arm/pvtime.o
 	OBJS		+= arm/pmu.o
 	ARCH_INCLUDE	:= arm/include
diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
deleted file mode 100644
index 2d1a4ed..0000000
diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
deleted file mode 100644
index 98b2437..0000000
diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/kvm/kvm-arch.h
similarity index 97%
rename from arm/include/arm-common/kvm-arch.h
rename to arm/include/kvm/kvm-arch.h
index 60eec02..b55b3bf 100644
--- a/arm/include/arm-common/kvm-arch.h
+++ b/arm/include/kvm/kvm-arch.h
@@ -84,6 +84,10 @@
 
 #define ARCH_HAS_PCI_EXP	1
 
+#define MAX_PAGE_SIZE	SZ_64K
+
+#define ARCH_HAS_CFG_RAM_ADDRESS	1
+
 static inline bool arm_addr_in_ioport_region(u64 phys_addr)
 {
 	u64 limit = KVM_IOPORT_AREA + ARM_IOPORT_SIZE;
diff --git a/arm/kvm.c b/arm/kvm.c
index cc0cc4f..5e7fe77 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -7,10 +7,19 @@
 
 #include "arm-common/gic.h"
 
+#include <linux/byteorder.h>
+#include <linux/cpumask.h>
 #include <linux/kernel.h>
 #include <linux/kvm.h>
 #include <linux/sizes.h>
 
+#include <asm/image.h>
+
+#include <kvm/util.h>
+
+
+static struct arm64_image_header *kernel_header;
+
 struct kvm_ext kvm_req_ext[] = {
 	{ DEFINE_KVM_EXT(KVM_CAP_IRQCHIP) },
 	{ DEFINE_KVM_EXT(KVM_CAP_ONE_REG) },
@@ -87,6 +96,33 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 {
 }
 
+static void kvm__arch_enable_mte(struct kvm *kvm)
+{
+	struct kvm_enable_cap cap = {
+		.cap = KVM_CAP_ARM_MTE,
+	};
+
+	if (kvm->cfg.arch.aarch32_guest) {
+		pr_debug("MTE is incompatible with AArch32");
+		return;
+	}
+
+	if (kvm->cfg.arch.mte_disabled) {
+		pr_debug("MTE disabled by user");
+		return;
+	}
+
+	if (!kvm__supports_extension(kvm, KVM_CAP_ARM_MTE)) {
+		pr_debug("MTE capability not available");
+		return;
+	}
+
+	if (ioctl(kvm->vm_fd, KVM_ENABLE_CAP, &cap))
+		die_perror("KVM_ENABLE_CAP(KVM_CAP_ARM_MTE)");
+
+	pr_debug("MTE capability enabled");
+}
+
 void kvm__arch_init(struct kvm *kvm)
 {
 	/* Create the virtual GIC. */
@@ -96,6 +132,90 @@ void kvm__arch_init(struct kvm *kvm)
 	kvm__arch_enable_mte(kvm);
 }
 
+static u64 kvm__arch_get_payload_region_size(struct kvm *kvm)
+{
+	if (kvm->cfg.arch.aarch32_guest)
+		return SZ_256M;
+
+	return SZ_512M;
+}
+
+/*
+ * Return the TEXT_OFFSET value that the guest kernel expects. Note
+ * that pre-3.17 kernels expose this value using the native endianness
+ * instead of Little-Endian. BE kernels of this vintage may fail to
+ * boot. See Documentation/arm64/booting.rst in your local kernel tree.
+ */
+static u64 kvm__arch_get_kern_offset(struct kvm *kvm)
+{
+	const char *debug_str;
+
+	/* the 32bit kernel offset is a well known value */
+	if (kvm->cfg.arch.aarch32_guest)
+		return 0x8000;
+
+	if (!kernel_header) {
+		debug_str = "Kernel header is missing";
+		goto default_offset;
+	}
+
+	if (!le64_to_cpu(kernel_header->image_size)) {
+		debug_str = "Image size is 0";
+		goto default_offset;
+	}
+
+	return le64_to_cpu(kernel_header->text_offset);
+
+default_offset:
+	pr_debug("%s, assuming TEXT_OFFSET to be 0x80000", debug_str);
+	return 0x80000;
+}
+
+static void kvm__arch_read_kernel_header(struct kvm *kvm, int fd)
+{
+	const char *debug_str;
+	off_t cur_offset;
+	ssize_t size;
+
+	if (kvm->cfg.arch.aarch32_guest)
+		return;
+
+	kernel_header = malloc(sizeof(*kernel_header));
+	if (!kernel_header)
+		return;
+
+	cur_offset = lseek(fd, 0, SEEK_CUR);
+	if (cur_offset == (off_t)-1 || lseek(fd, 0, SEEK_SET) == (off_t)-1) {
+		debug_str = "Failed to seek in kernel image file";
+		goto fail;
+	}
+
+	size = xread(fd, kernel_header, sizeof(*kernel_header));
+	if (size < 0 || (size_t)size < sizeof(*kernel_header))
+		die("Failed to read kernel image header");
+
+	lseek(fd, cur_offset, SEEK_SET);
+
+	if (memcmp(&kernel_header->magic, ARM64_IMAGE_MAGIC, sizeof(kernel_header->magic))) {
+		debug_str = "Kernel image magic not matching";
+		kernel_header = NULL;
+		goto fail;
+	}
+
+	return;
+
+fail:
+	pr_debug("%s, using defaults", debug_str);
+}
+
+static u64 kvm__arch_get_kernel_size(struct kvm *kvm)
+{
+	if (kvm->cfg.arch.aarch32_guest || !kernel_header)
+		return 0;
+
+	return le64_to_cpu(kernel_header->image_size);
+}
+
 #define FDT_ALIGN	SZ_2M
 #define INITRD_ALIGN	4
 bool kvm__arch_load_kernel_image(struct kvm *kvm, int fd_kernel, int fd_initrd,
@@ -264,3 +384,93 @@ int kvm__arch_setup_firmware(struct kvm *kvm)
 {
 	return 0;
 }
+
+int vcpu_affinity_parser(const struct option *opt, const char *arg, int unset)
+{
+	struct kvm *kvm = opt->ptr;
+	const char *cpulist = arg;
+	cpumask_t *cpumask;
+	int cpu, ret;
+
+	kvm->cfg.arch.vcpu_affinity = cpulist;
+
+	cpumask = calloc(1, cpumask_size());
+	if (!cpumask)
+		die_perror("calloc");
+
+	ret = cpulist_parse(cpulist, cpumask);
+	if (ret) {
+		free(cpumask);
+		return ret;
+	}
+
+	kvm->arch.vcpu_affinity_cpuset = CPU_ALLOC(NR_CPUS);
+	if (!kvm->arch.vcpu_affinity_cpuset)
+		die_perror("CPU_ALLOC");
+	CPU_ZERO_S(CPU_ALLOC_SIZE(NR_CPUS), kvm->arch.vcpu_affinity_cpuset);
+
+	for_each_cpu(cpu, cpumask)
+		CPU_SET(cpu, kvm->arch.vcpu_affinity_cpuset);
+
+	return 0;
+}
+
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+
+	if (kvm->cfg.ram_addr < ARM_MEMORY_AREA) {
+		die("RAM address is below the I/O region ending at %luGB",
+		    ARM_MEMORY_AREA >> 30);
+	}
+
+	if (kvm->cfg.arch.aarch32_guest &&
+	    kvm->cfg.ram_addr + kvm->cfg.ram_size > SZ_4G) {
+		die("RAM extends above 4GB");
+	}
+}
+
+u64 kvm__arch_default_ram_address(void)
+{
+	return ARM_MEMORY_AREA;
+}
+
+static int kvm__arch_get_ipa_limit(struct kvm *kvm)
+{
+	int ret;
+
+	ret = ioctl(kvm->sys_fd, KVM_CHECK_EXTENSION, KVM_CAP_ARM_VM_IPA_SIZE);
+	if (ret <= 0)
+		ret = 0;
+
+	return ret;
+}
+
+int kvm__get_vm_type(struct kvm *kvm)
+{
+	unsigned int ipa_bits, max_ipa_bits;
+	unsigned long max_ipa;
+
+	/* If we're running on an old kernel, use 0 as the VM type */
+	max_ipa_bits = kvm__arch_get_ipa_limit(kvm);
+	if (!max_ipa_bits)
+		return 0;
+
+	/* Otherwise, compute the minimal required IPA size */
+	max_ipa = kvm->cfg.ram_addr + kvm->cfg.ram_size - 1;
+	ipa_bits = max(32, fls_long(max_ipa));
+	pr_debug("max_ipa %lx ipa_bits %d max_ipa_bits %d",
+		 max_ipa, ipa_bits, max_ipa_bits);
+
+	if (ipa_bits > max_ipa_bits)
+		die("Memory too large for this system (needs %d bits, %d available)", ipa_bits, max_ipa_bits);
+
+	return KVM_VM_TYPE_ARM_IPA_SIZE(ipa_bits);
+}
+
+static int kvm__arch_free_kernel_header(struct kvm *kvm)
+{
+	free(kernel_header);
+
+	return 0;
+}
+late_exit(kvm__arch_free_kernel_header);
-- 
2.39.5