[PATCH v2 kvmtool 00/12] arm64: Allow the user to set RAM base address

[PATCH v2 kvmtool 00/12] arm64: Allow the user to set RAM base address

[Alexandru Elisei]

The series can be found at [1]. It is loosely based on the patches that
allow the user to define the VM memory layout (RAM + MMIO) [2]. I've
cherry-picked a handful of patches from that series, the rest I wrote from
scratch since there have been several changes to the way guest memory is
handled. I've chosen to focus on specifying the RAM layout with only one
RAM bank and leave the rest for a later series because this was relatively
easy to accomplish, while still being very useful.

Because this series comes after almost three year of changes to kvmtool,
I've decided to drop all the Reviewed-by tags. Thanks to Andre and Suzuki
for reviewing the previous patches, it has been very much appreciated.

What this series does: for arm64, the user can now specify the base address
for RAM:

$ ./lkvm run -m1G@2G .. # Equivalent to ./lkvm run -m1024

The memory units are B (bytes), K (kilobytes), M (megabytes), G
(gigabytes), T (terrabytes), P (petabytes).

Want to put RAM at the top of the physical address range? Easy:

$ ./lkvm run -m2G@1022G .. # Assumes the maximum is 40 bits of IPA

There one limitation on the RAM base address: it must not overlap with the
MMIO range that kvmtool uses, which lives below 2GB.

Why this is useful, in my opinion:

1. Testing how a payload handles different memory layouts without the need
to hack kvmtool or find the hardware that implements the desired layout.

2. It can serve as a development tool for adding support for larger PA
ranges for Linux and KVM (currently capped at 48 bits for 4k/16k pages), or
other payloads.

Overview of the series:

* The series starts with refactoring how kvm->cfg.ram_size is validated
  and used, followed by several cleanups in the arm and arm64 code.

* Then patch #8 ("builtin_run: Allow standard size specifiers for memory")
  introduced the ability to specify the measurement unit for memory. I
  believe that typing the equivalent of 2TB in megabytes isn't appealing
  for anyone.

* More cleanups in the arm/arm64 code follow, which are needed for patch
  #12 ("arm64: Allow the user to specify the RAM base address"). This is
  where the ability to specify the RAM base address is introduced.

Changes since v1:

* Rebased on top of current HEAD (commit 4639b72f61a3 ("arm64: Add
  --vcpu-affinity command line argument")).

* Removed the last 3 patches that touched the --firmware-address command line
  argument. They weren't necessary for this series, I'll resend them after this
  series gets merged.

* Moved patch #8 ("builtin_run: Allow standard size specifiers for memory")
  later in the series (was #6).

[1] https://gitlab.arm.com/linux-arm/kvmtool-ae/-/tree/arm-allow-the-user-to-define-ram-address-v2
[2] https://lkml.kernel.org/kvm/1569245722-23375-1-git-send-email-alexandru.elisei@arm.com/

Alexandru Elisei (9):
  Use MB for megabytes consistently
  builtin-run: Always use RAM size in bytes
  builtin-run: Rework RAM size validation
  builtin-run: Add arch hook to validate VM configuration
  arm/arm64: Fail if RAM size is too large for 32-bit guests
  arm/arm64: Kill the ARM_MAX_MEMORY() macro
  arm/arm64: Kill the ARM_HIMAP_MAX_MEMORY() macro
  Introduce kvm__arch_default_ram_address()
  arm64: Allow the user to specify the RAM base address

Julien Grall (2):
  kvm__arch_init: Remove hugetlbfs_path and ram_size as parameters
  arm/arm64: Consolidate RAM initialization in kvm__init_ram()

Suzuki K Poulose (1):
  builtin_run: Allow standard size specifiers for memory

 Documentation/kvmtool.1            |   4 +-
 Makefile                           |   1 +
 arm/aarch32/include/kvm/kvm-arch.h |   2 -
 arm/aarch32/kvm.c                  |  14 ++++
 arm/aarch64/include/kvm/kvm-arch.h |  18 +----
 arm/aarch64/kvm.c                  |  19 ++++-
 arm/include/arm-common/kvm-arch.h  |   1 -
 arm/kvm.c                          |  60 ++++++++-------
 builtin-run.c                      | 115 +++++++++++++++++++++++++----
 include/kvm/kvm-config.h           |   8 +-
 include/kvm/kvm.h                  |  18 ++++-
 kvm.c                              |   2 +-
 mips/kvm.c                         |  16 +++-
 powerpc/kvm.c                      |  14 +++-
 riscv/kvm.c                        |  16 +++-
 x86/kvm.c                          |  13 +++-
 16 files changed, 241 insertions(+), 80 deletions(-)
 create mode 100644 arm/aarch32/kvm.c

-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 01/12] Use MB for megabytes consistently

[Alexandru Elisei]

The help text for the -m/--mem argument states that the guest memory size
is in MiB (mebibyte). MiB is the same thing as MB (megabyte), and indeed
this is how MB is used throughout kvmtool.

Replace MiB with MB, so people don't get the wrong idea and start
believing that for kvmtool a MB is 10^6 bytes instead of 2^20.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 Documentation/kvmtool.1 | 4 ++--
 builtin-run.c           | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/kvmtool.1 b/Documentation/kvmtool.1
index 2b8c274dc3ff..25d46f8f51f9 100644
--- a/Documentation/kvmtool.1
+++ b/Documentation/kvmtool.1
@@ -10,7 +10,7 @@ kvmtool is a userland tool for creating and controlling KVM guests.
 .SH "KVMTOOL COMMANDS"
 .sp
 .PP
-.B run -k <kernel\-image> [\-c <cores>] [\-m <MiB>] [\-p <command line>]
+.B run -k <kernel\-image> [\-c <cores>] [\-m <MB>] [\-p <command line>]
 .br
 .B [\-i <initrd>] [\-d <image file>] [\-\-console serial|virtio|hv]
 .br
@@ -30,7 +30,7 @@ The number of virtual CPUs to run.
 .sp
 .B \-m, \-\-mem <n>
 .RS 4
-Virtual machine memory size in MiB.
+Virtual machine memory size in MB.
 .RE
 .sp
 .B \-p, \-\-params <parameters>
diff --git a/builtin-run.c b/builtin-run.c
index 9a1a0c1fa6fb..0126c9fbcba6 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -97,7 +97,7 @@ void kvm_run_set_wrapper_sandbox(void)
 			"A name for the guest"),			\
 	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
 	OPT_U64('m', "mem", &(cfg)->ram_size, "Virtual machine memory"	\
-		" size in MiB."),					\
+		" size in MB."),					\
 	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
 			" image or rootfs directory", img_name_parser,	\
 			kvm),						\
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 02/12] builtin-run: Always use RAM size in bytes

[Alexandru Elisei]

The user can specify the virtual machine memory size in MB, which is saved
in cfg->ram_size. kvmtool validates it against the host memory size,
converted from bytes to MB. ram_size is then converted to bytes, and this
is how it is used throughout the rest of kvmtool.

To avoid any confusion about the unit of measurement, especially once the
user is allowed to specify the unit of measurement, always use ram_size in
bytes.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 builtin-run.c            | 19 ++++++++++---------
 include/kvm/kvm-config.h |  7 ++++---
 include/kvm/kvm.h        |  2 +-
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/builtin-run.c b/builtin-run.c
index 0126c9fbcba6..236c59d2f86f 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -36,6 +36,7 @@
 
 #include <linux/types.h>
 #include <linux/err.h>
+#include <linux/sizes.h>
 
 #include <sys/utsname.h>
 #include <sys/types.h>
@@ -264,7 +265,7 @@ static u64 host_ram_size(void)
 		return 0;
 	}
 
-	return (nr_pages * page_size) >> MB_SHIFT;
+	return nr_pages * page_size;
 }
 
 /*
@@ -278,11 +279,11 @@ static u64 get_ram_size(int nr_cpus)
 	u64 available;
 	u64 ram_size;
 
-	ram_size	= 64 * (nr_cpus + 3);
+	ram_size	= SZ_64M * (nr_cpus + 3);
 
 	available	= host_ram_size() * RAM_SIZE_RATIO;
 	if (!available)
-		available = MIN_RAM_SIZE_MB;
+		available = MIN_RAM_SIZE;
 
 	if (ram_size > available)
 		ram_size	= available;
@@ -595,13 +596,13 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 
 	if (!kvm->cfg.ram_size)
 		kvm->cfg.ram_size = get_ram_size(kvm->cfg.nrcpus);
+	else
+		kvm->cfg.ram_size <<= MB_SHIFT;
 
 	if (kvm->cfg.ram_size > host_ram_size())
 		pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
-			(unsigned long long)kvm->cfg.ram_size,
-			(unsigned long long)host_ram_size());
-
-	kvm->cfg.ram_size <<= MB_SHIFT;
+			(unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
+			(unsigned long long)host_ram_size() >> MB_SHIFT);
 
 	if (!kvm->cfg.dev)
 		kvm->cfg.dev = DEFAULT_KVM_DEV;
@@ -676,12 +677,12 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 	if (kvm->cfg.kernel_filename) {
 		printf("  # %s run -k %s -m %Lu -c %d --name %s\n", KVM_BINARY_NAME,
 		       kvm->cfg.kernel_filename,
-		       (unsigned long long)kvm->cfg.ram_size / 1024 / 1024,
+		       (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
 		       kvm->cfg.nrcpus, kvm->cfg.guest_name);
 	} else if (kvm->cfg.firmware_filename) {
 		printf("  # %s run --firmware %s -m %Lu -c %d --name %s\n", KVM_BINARY_NAME,
 		       kvm->cfg.firmware_filename,
-		       (unsigned long long)kvm->cfg.ram_size / 1024 / 1024,
+		       (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
 		       kvm->cfg.nrcpus, kvm->cfg.guest_name);
 	}
 
diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
index 6a5720c4c7d4..31bc89520d52 100644
--- a/include/kvm/kvm-config.h
+++ b/include/kvm/kvm-config.h
@@ -5,6 +5,8 @@
 #include "kvm/vfio.h"
 #include "kvm/kvm-config-arch.h"
 
+#include <linux/sizes.h>
+
 #define DEFAULT_KVM_DEV		"/dev/kvm"
 #define DEFAULT_CONSOLE		"serial"
 #define DEFAULT_NETWORK		"user"
@@ -15,14 +17,13 @@
 #define DEFAULT_SCRIPT		"none"
 #define DEFAULT_SANDBOX_FILENAME "guest/sandbox.sh"
 
-#define MIN_RAM_SIZE_MB		(64ULL)
-#define MIN_RAM_SIZE_BYTE	(MIN_RAM_SIZE_MB << MB_SHIFT)
+#define MIN_RAM_SIZE		SZ_64M
 
 struct kvm_config {
 	struct kvm_config_arch arch;
 	struct disk_image_params disk_image[MAX_DISK_IMAGES];
 	struct vfio_device_params *vfio_devices;
-	u64 ram_size;
+	u64 ram_size;		/* Guest memory size, in bytes */
 	u8 num_net_devices;
 	u8 num_vfio_devices;
 	u64 vsock_cid;
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index ad732e56f5ed..7b14b33b50ca 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -87,7 +87,7 @@ struct kvm {
 	struct kvm_cpu		**cpus;
 
 	u32			mem_slots;	/* for KVM_SET_USER_MEMORY_REGION */
-	u64			ram_size;
+	u64			ram_size;	/* Guest memory size, in bytes */
 	void			*ram_start;
 	u64			ram_pagesize;
 	struct mutex		mem_banks_lock;
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 03/12] builtin-run: Rework RAM size validation

[Alexandru Elisei]

host_ram_size() uses sysconf() to calculate the available ram, and
sysconf() can fail. When that happens, host_ram_size() returns 0. kvmtool
warns the user when the configured VM ram size exceeds the size of the
host's memory, but doesn't take into account that host_ram_size() can
return 0. If the function returns zero, skip the warning.

Since this can only happen when the user sets the memory size (via the
-m/--mem command line argument), skip the check entirely if the user hasn't
set it. Move the check to kvm_run_validate_cfg(), as it checks for valid
user configuration.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 builtin-run.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/builtin-run.c b/builtin-run.c
index 236c59d2f86f..4491fd244f8c 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -509,6 +509,8 @@ static void kvm_run_set_real_cmdline(struct kvm *kvm)
 
 static void kvm_run_validate_cfg(struct kvm *kvm)
 {
+	u64 available_ram;
+
 	if (kvm->cfg.kernel_filename && kvm->cfg.firmware_filename)
 		die("Only one of --kernel or --firmware can be specified");
 
@@ -518,6 +520,17 @@ static void kvm_run_validate_cfg(struct kvm *kvm)
 
 	if (kvm->cfg.firmware_filename && kvm->cfg.initrd_filename)
 		pr_warning("Ignoring initrd file when loading a firmware image");
+
+	if (kvm->cfg.ram_size) {
+		/* User specifies RAM size in megabytes. */
+		kvm->cfg.ram_size <<= MB_SHIFT;
+		available_ram = host_ram_size();
+		if (available_ram && kvm->cfg.ram_size > available_ram) {
+			pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
+				(unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
+				(unsigned long long)available_ram >> MB_SHIFT);
+		}
+	}
 }
 
 static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
@@ -596,13 +609,6 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 
 	if (!kvm->cfg.ram_size)
 		kvm->cfg.ram_size = get_ram_size(kvm->cfg.nrcpus);
-	else
-		kvm->cfg.ram_size <<= MB_SHIFT;
-
-	if (kvm->cfg.ram_size > host_ram_size())
-		pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
-			(unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
-			(unsigned long long)host_ram_size() >> MB_SHIFT);
 
 	if (!kvm->cfg.dev)
 		kvm->cfg.dev = DEFAULT_KVM_DEV;
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 04/12] builtin-run: Add arch hook to validate VM configuration

[Alexandru Elisei]

Architectures are free to set their own command line options. Add an
architecture specific hook to validate these options.

For now, the hook does nothing, but it will be used in later patches.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 Makefile          | 1 +
 arm/aarch32/kvm.c | 5 +++++
 arm/aarch64/kvm.c | 4 ++++
 builtin-run.c     | 2 ++
 include/kvm/kvm.h | 1 +
 mips/kvm.c        | 4 ++++
 powerpc/kvm.c     | 4 ++++
 riscv/kvm.c       | 4 ++++
 x86/kvm.c         | 4 ++++
 9 files changed, 29 insertions(+)
 create mode 100644 arm/aarch32/kvm.c

diff --git a/Makefile b/Makefile
index 9e67c7637b1e..25d79637b561 100644
--- a/Makefile
+++ b/Makefile
@@ -168,6 +168,7 @@ ifeq ($(ARCH), arm)
 	OBJS		+= $(OBJS_ARM_COMMON)
 	OBJS		+= arm/aarch32/arm-cpu.o
 	OBJS		+= arm/aarch32/kvm-cpu.o
+	OBJS		+= arm/aarch32/kvm.o
 	ARCH_INCLUDE	:= $(HDRS_ARM_COMMON)
 	ARCH_INCLUDE	+= -Iarm/aarch32/include
 	CFLAGS		+= -march=armv7-a
diff --git a/arm/aarch32/kvm.c b/arm/aarch32/kvm.c
new file mode 100644
index 000000000000..ae33ac92479a
--- /dev/null
+++ b/arm/aarch32/kvm.c
@@ -0,0 +1,5 @@
+#include "kvm/kvm.h"
+
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index 1b992dd592d4..46f20e5a5a86 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -37,6 +37,10 @@ int vcpu_affinity_parser(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
+
 /*
  * Return the TEXT_OFFSET value that the guest kernel expects. Note
  * that pre-3.17 kernels expose this value using the native endianness
diff --git a/builtin-run.c b/builtin-run.c
index 4491fd244f8c..2c37b91b6574 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -531,6 +531,8 @@ static void kvm_run_validate_cfg(struct kvm *kvm)
 				(unsigned long long)available_ram >> MB_SHIFT);
 		}
 	}
+
+	kvm__arch_validate_cfg(kvm);
 }
 
 static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 7b14b33b50ca..9f7b2fb26e95 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -187,6 +187,7 @@ int kvm__get_sock_by_instance(const char *name);
 int kvm__enumerate_instances(int (*callback)(const char *name, int pid));
 void kvm__remove_socket(const char *name);
 
+void kvm__arch_validate_cfg(struct kvm *kvm);
 void kvm__arch_set_cmdline(char *cmdline, bool video);
 void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size);
 void kvm__arch_delete_ram(struct kvm *kvm);
diff --git a/mips/kvm.c b/mips/kvm.c
index 3470dbb2e433..f5b137f46dff 100644
--- a/mips/kvm.c
+++ b/mips/kvm.c
@@ -12,6 +12,10 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
+
 void kvm__arch_read_term(struct kvm *kvm)
 {
 	virtio_console__inject_interrupt(kvm);
diff --git a/powerpc/kvm.c b/powerpc/kvm.c
index 702d67dca614..3215b579f5dc 100644
--- a/powerpc/kvm.c
+++ b/powerpc/kvm.c
@@ -48,6 +48,10 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
+
 static uint32_t mfpvr(void)
 {
 	uint32_t r;
diff --git a/riscv/kvm.c b/riscv/kvm.c
index 84e02779a91c..7fb496282f4c 100644
--- a/riscv/kvm.c
+++ b/riscv/kvm.c
@@ -13,6 +13,10 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 },
 };
 
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
+
 bool kvm__arch_cpu_supports_vm(void)
 {
 	/* The KVM capability check is enough. */
diff --git a/x86/kvm.c b/x86/kvm.c
index 3e0f0b743f8c..6683a5c81d49 100644
--- a/x86/kvm.c
+++ b/x86/kvm.c
@@ -35,6 +35,10 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+void kvm__arch_validate_cfg(struct kvm *kvm)
+{
+}
+
 bool kvm__arch_cpu_supports_vm(void)
 {
 	struct cpuid_regs regs;
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 05/12] arm/arm64: Fail if RAM size is too large for 32-bit guests

[Alexandru Elisei]

For 64-bit guests, kvmtool exists with an error in kvm__get_vm_type() if
the memory size is larger than what KVM supports. For 32-bit guests, the
RAM size is silently rounded down to ARM_LOMAP_MAX_MEMORY in
kvm__arch_init().

Be consistent and exit with an error when the user has configured the
wrong RAM size for 32-bit guests.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/aarch32/kvm.c | 4 ++++
 arm/aarch64/kvm.c | 5 +++++
 arm/kvm.c         | 2 +-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/arm/aarch32/kvm.c b/arm/aarch32/kvm.c
index ae33ac92479a..9d68d7a15ee2 100644
--- a/arm/aarch32/kvm.c
+++ b/arm/aarch32/kvm.c
@@ -2,4 +2,8 @@
 
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
+	if (kvm->cfg.ram_size > ARM_LOMAP_MAX_MEMORY) {
+		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
+		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
+	}
 }
diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index 46f20e5a5a86..5db8e295c433 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -39,6 +39,11 @@ int vcpu_affinity_parser(const struct option *opt, const char *arg, int unset)
 
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
+	if (kvm->cfg.arch.aarch32_guest &&
+	    kvm->cfg.ram_size > ARM_LOMAP_MAX_MEMORY) {
+		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
+		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
+	}
 }
 
 /*
diff --git a/arm/kvm.c b/arm/kvm.c
index c5913000e1ed..af0feae495d7 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -65,7 +65,7 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
 	 * If using THP, then our minimal alignment becomes 2M.
 	 * 2M trumps 64K, so let's go with that.
 	 */
-	kvm->ram_size = min(ram_size, (u64)ARM_MAX_MEMORY(kvm));
+	kvm->ram_size = ram_size;
 	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
 	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path,
 						kvm->arch.ram_alloc_size);
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 06/12] arm/arm64: Kill the ARM_MAX_MEMORY() macro

[Alexandru Elisei]

For 32-bit guests, the maximum memory size is represented by the define
ARM_LOMAP_MAX_MEMORY, which ARM_MAX_MEMORY() returns.

For 64-bit guests, the RAM size is checked against the maximum allowed
by KVM in kvm__get_vm_type().

There are no users left for the ARM_MAX_MEMORY() macro, remove it.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/aarch32/include/kvm/kvm-arch.h |  2 --
 arm/aarch64/include/kvm/kvm-arch.h | 16 ----------------
 2 files changed, 18 deletions(-)

diff --git a/arm/aarch32/include/kvm/kvm-arch.h b/arm/aarch32/include/kvm/kvm-arch.h
index 5616b27e257e..467fb09175b8 100644
--- a/arm/aarch32/include/kvm/kvm-arch.h
+++ b/arm/aarch32/include/kvm/kvm-arch.h
@@ -8,8 +8,6 @@
 struct kvm;
 static inline void kvm__arch_enable_mte(struct kvm *kvm) {}
 
-#define ARM_MAX_MEMORY(...)	ARM_LOMAP_MAX_MEMORY
-
 #define MAX_PAGE_SIZE	SZ_4K
 
 #include "arm-common/kvm-arch.h"
diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
index 9124f6919d0f..ff857ca6e7b4 100644
--- a/arm/aarch64/include/kvm/kvm-arch.h
+++ b/arm/aarch64/include/kvm/kvm-arch.h
@@ -8,22 +8,6 @@ unsigned long long kvm__arch_get_kern_offset(struct kvm *kvm, int fd);
 int kvm__arch_get_ipa_limit(struct kvm *kvm);
 void kvm__arch_enable_mte(struct kvm *kvm);
 
-#define ARM_MAX_MEMORY(kvm)	({					\
-	u64 max_ram;							\
-									\
-	if ((kvm)->cfg.arch.aarch32_guest) {				\
-		max_ram = ARM_LOMAP_MAX_MEMORY;				\
-	} else {							\
-		int ipabits = kvm__arch_get_ipa_limit(kvm);		\
-		if (ipabits <= 0)					\
-			max_ram = ARM_HIMAP_MAX_MEMORY;			\
-		else							\
-			max_ram = (1ULL << ipabits) - ARM_MEMORY_AREA;	\
-	}								\
-									\
-	max_ram;							\
-})
-
 #define MAX_PAGE_SIZE	SZ_64K
 
 #include "arm-common/kvm-arch.h"
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 07/12] arm/arm64: Kill the ARM_HIMAP_MAX_MEMORY() macro

[Alexandru Elisei]

The ARM_HIMAP_MAX_MEMORY() is a remnant of a time when KVM only supported
40 bits if IPA. There are no users left for this macro, remove it.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/include/arm-common/kvm-arch.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arm/include/arm-common/kvm-arch.h b/arm/include/arm-common/kvm-arch.h
index fc55360d4d15..6d80aac17125 100644
--- a/arm/include/arm-common/kvm-arch.h
+++ b/arm/include/arm-common/kvm-arch.h
@@ -65,7 +65,6 @@
 
 
 #define ARM_LOMAP_MAX_MEMORY	((1ULL << 32) - ARM_MEMORY_AREA)
-#define ARM_HIMAP_MAX_MEMORY	((1ULL << 40) - ARM_MEMORY_AREA)
 
 
 #define KVM_IOEVENTFD_HAS_PIO	0
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 08/12] builtin_run: Allow standard size specifiers for memory

[Alexandru Elisei]

From: Suzuki K Poulose <suzuki.poulose@arm.com>

Allow the user to use the standard B (bytes), K (kilobytes), M (megabytes),
G (gigabytes), T (terabytes) and P (petabytes) suffixes for memory size.
When none are specified, the default is megabytes.

Also raise an error if the guest specifies 0 as the memory size, instead
of treating it as uninitialized, as kvmtool has done so far.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 builtin-run.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 60 insertions(+), 5 deletions(-)

diff --git a/builtin-run.c b/builtin-run.c
index 2c37b91b6574..57c58be55159 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -49,9 +49,11 @@
 #include <ctype.h>
 #include <stdio.h>
 
-#define MB_SHIFT		(20)
 #define KB_SHIFT		(10)
+#define MB_SHIFT		(20)
 #define GB_SHIFT		(30)
+#define TB_SHIFT		(40)
+#define PB_SHIFT		(50)
 
 __thread struct kvm_cpu *current_kvm_cpu;
 
@@ -87,6 +89,60 @@ void kvm_run_set_wrapper_sandbox(void)
 	kvm_run_wrapper = KVM_RUN_SANDBOX;
 }
 
+static int parse_mem_unit(char **next)
+{
+	int shift = -1;
+
+	switch (**next) {
+	case 'B': case 'b': shift = 0; break;
+	case 'K': case 'k': shift = KB_SHIFT; break;
+	case 'M': case 'm': shift = MB_SHIFT; break;
+	case 'G': case 'g': shift = GB_SHIFT; break;
+	case 'T': case 't': shift = TB_SHIFT; break;
+	case 'P': case 'p': shift = PB_SHIFT; break;
+	}
+
+	if (shift == -1) {
+		/* The default is megabytes. */
+		shift = MB_SHIFT;
+	} else {
+		(*next)++;
+	}
+
+	return shift;
+}
+
+static u64 parse_mem_option(const char *nptr, char **next)
+{
+	u64 shift;
+	u64 val;
+
+	val = strtoull(nptr, next, 10);
+	if (errno == ERANGE)
+		die("Memory too large: %s", nptr);
+	shift = parse_mem_unit(next);
+
+	if ((val << shift) < val)
+		die("Memory too large: %s", nptr);
+
+	return val << shift;
+}
+
+static int mem_parser(const struct option *opt, const char *arg, int unset)
+{
+	struct kvm *kvm = opt->ptr;
+	char *next;
+
+	kvm->cfg.ram_size = parse_mem_option(arg, &next);
+	if (kvm->cfg.ram_size == 0)
+		die("Invalid RAM size: %s", arg);
+
+	if (*next != '\0')
+		die("Invalid memory specifier: %s", arg);
+
+	return 0;
+}
+
 #ifndef OPT_ARCH_RUN
 #define OPT_ARCH_RUN(...)
 #endif
@@ -97,8 +153,9 @@ void kvm_run_set_wrapper_sandbox(void)
 	OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name",	\
 			"A name for the guest"),			\
 	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
-	OPT_U64('m', "mem", &(cfg)->ram_size, "Virtual machine memory"	\
-		" size in MB."),					\
+	OPT_CALLBACK('m', "mem", NULL, "size[BKMGTP]",			\
+		     "Virtual machine memory size, by default measured"	\
+		     " in megabytes (M)", mem_parser, kvm),		\
 	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
 			" image or rootfs directory", img_name_parser,	\
 			kvm),						\
@@ -522,8 +579,6 @@ static void kvm_run_validate_cfg(struct kvm *kvm)
 		pr_warning("Ignoring initrd file when loading a firmware image");
 
 	if (kvm->cfg.ram_size) {
-		/* User specifies RAM size in megabytes. */
-		kvm->cfg.ram_size <<= MB_SHIFT;
 		available_ram = host_ram_size();
 		if (available_ram && kvm->cfg.ram_size > available_ram) {
 			pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 09/12] kvm__arch_init: Remove hugetlbfs_path and ram_size as parameters

[Alexandru Elisei]

From: Julien Grall <julien.grall@arm.com>

The kvm struct already contains a pointer to the configuration, which
contains both hugetlbfs_path and ram_size, so is it not necessary to pass
them as arguments to kvm__arch_init().

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/kvm.c         | 7 ++++---
 include/kvm/kvm.h | 2 +-
 kvm.c             | 2 +-
 mips/kvm.c        | 7 ++++---
 powerpc/kvm.c     | 5 +++--
 riscv/kvm.c       | 7 ++++---
 x86/kvm.c         | 4 +++-
 7 files changed, 20 insertions(+), 14 deletions(-)

diff --git a/arm/kvm.c b/arm/kvm.c
index af0feae495d7..bd44aa350796 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -57,7 +57,7 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 {
 }
 
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
+void kvm__arch_init(struct kvm *kvm)
 {
 	/*
 	 * Allocate guest memory. We must align our buffer to 64K to
@@ -65,9 +65,10 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
 	 * If using THP, then our minimal alignment becomes 2M.
 	 * 2M trumps 64K, so let's go with that.
 	 */
-	kvm->ram_size = ram_size;
+	kvm->ram_size = kvm->cfg.ram_size;
 	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
-	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path,
+	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm,
+						kvm->cfg.hugetlbfs_path,
 						kvm->arch.ram_alloc_size);
 
 	if (kvm->arch.ram_alloc_start == MAP_FAILED)
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 9f7b2fb26e95..640b76c095f9 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -189,7 +189,7 @@ void kvm__remove_socket(const char *name);
 
 void kvm__arch_validate_cfg(struct kvm *kvm);
 void kvm__arch_set_cmdline(char *cmdline, bool video);
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size);
+void kvm__arch_init(struct kvm *kvm);
 void kvm__arch_delete_ram(struct kvm *kvm);
 int kvm__arch_setup_firmware(struct kvm *kvm);
 int kvm__arch_free_firmware(struct kvm *kvm);
diff --git a/kvm.c b/kvm.c
index 952ef1fbb41c..42b881217df6 100644
--- a/kvm.c
+++ b/kvm.c
@@ -479,7 +479,7 @@ int kvm__init(struct kvm *kvm)
 		goto err_vm_fd;
 	}
 
-	kvm__arch_init(kvm, kvm->cfg.hugetlbfs_path, kvm->cfg.ram_size);
+	kvm__arch_init(kvm);
 
 	INIT_LIST_HEAD(&kvm->mem_banks);
 	kvm__init_ram(kvm);
diff --git a/mips/kvm.c b/mips/kvm.c
index f5b137f46dff..d8610cf81b94 100644
--- a/mips/kvm.c
+++ b/mips/kvm.c
@@ -61,12 +61,13 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 }
 
 /* Architecture-specific KVM init */
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
+void kvm__arch_init(struct kvm *kvm)
 {
 	int ret;
 
-	kvm->ram_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path, ram_size);
-	kvm->ram_size = ram_size;
+	kvm->ram_size = kvm->cfg.ram_size;
+	kvm->ram_start = mmap_anon_or_hugetlbfs(kvm, kvm->cfg.hugetlbfs_path,
+						kvm->ram_size);
 
 	if (kvm->ram_start == MAP_FAILED)
 		die("out of memory");
diff --git a/powerpc/kvm.c b/powerpc/kvm.c
index 3215b579f5dc..d281b070fd0e 100644
--- a/powerpc/kvm.c
+++ b/powerpc/kvm.c
@@ -92,12 +92,13 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 }
 
 /* Architecture-specific KVM init */
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
+void kvm__arch_init(struct kvm *kvm)
 {
+	const char *hugetlbfs_path = kvm->cfg.hugetlbfs_path;
 	int cap_ppc_rma;
 	unsigned long hpt;
 
-	kvm->ram_size		= ram_size;
+	kvm->ram_size		= kvm->cfg.ram_size;
 
 	/* Map "default" hugetblfs path to the standard 16M mount point */
 	if (hugetlbfs_path && !strcmp(hugetlbfs_path, "default"))
diff --git a/riscv/kvm.c b/riscv/kvm.c
index 7fb496282f4c..c46660772aa0 100644
--- a/riscv/kvm.c
+++ b/riscv/kvm.c
@@ -56,7 +56,7 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 {
 }
 
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
+void kvm__arch_init(struct kvm *kvm)
 {
 	/*
 	 * Allocate guest memory. We must align our buffer to 64K to
@@ -64,9 +64,10 @@ void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
 	 * If using THP, then our minimal alignment becomes 2M.
 	 * 2M trumps 64K, so let's go with that.
 	 */
-	kvm->ram_size = min(ram_size, (u64)RISCV_MAX_MEMORY(kvm));
+	kvm->ram_size = min(kvm->cfg.ram_size, (u64)RISCV_MAX_MEMORY(kvm));
 	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
-	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm, hugetlbfs_path,
+	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm,
+						kvm->cfg.hugetlbfs_path,
 						kvm->arch.ram_alloc_size);
 
 	if (kvm->arch.ram_alloc_start == MAP_FAILED)
diff --git a/x86/kvm.c b/x86/kvm.c
index 6683a5c81d49..24b0305a1841 100644
--- a/x86/kvm.c
+++ b/x86/kvm.c
@@ -134,9 +134,11 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 }
 
 /* Architecture-specific KVM init */
-void kvm__arch_init(struct kvm *kvm, const char *hugetlbfs_path, u64 ram_size)
+void kvm__arch_init(struct kvm *kvm)
 {
+	const char *hugetlbfs_path = kvm->cfg.hugetlbfs_path;
 	struct kvm_pit_config pit_config = { .flags = 0, };
+	u64 ram_size = kvm->cfg.ram_size;
 	int ret;
 
 	ret = ioctl(kvm->vm_fd, KVM_SET_TSS_ADDR, 0xfffbd000);
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 10/12] arm/arm64: Consolidate RAM initialization in kvm__init_ram()

[Alexandru Elisei]

From: Julien Grall <julien.grall@arm.com>

RAM initialization is unnecessarily split between kvm__init_ram() and
kvm__arch_init(). Move all code related to RAM initialization to
kvm__init_ram(), making the code easier to follow and to modify.

One thing to note is that the initialization order is slightly altered:
kvm__arch_enable_mte() and gic__create() are now called before mmap'ing the
guest RAM. That is perfectly fine, as they don't use the host's mapping of
the guest memory.

Signed-off-by: Julien Grall <julien.grall@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/kvm.c | 52 ++++++++++++++++++++++++++--------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

diff --git a/arm/kvm.c b/arm/kvm.c
index bd44aa350796..abcccfabf59e 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -26,9 +26,34 @@ bool kvm__arch_cpu_supports_vm(void)
 
 void kvm__init_ram(struct kvm *kvm)
 {
-	int err;
 	u64 phys_start, phys_size;
 	void *host_mem;
+	int err;
+
+	/*
+	 * Allocate guest memory. We must align our buffer to 64K to
+	 * correlate with the maximum guest page size for virtio-mmio.
+	 * If using THP, then our minimal alignment becomes 2M.
+	 * 2M trumps 64K, so let's go with that.
+	 */
+	kvm->ram_size = kvm->cfg.ram_size;
+	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
+	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm,
+						kvm->cfg.hugetlbfs_path,
+						kvm->arch.ram_alloc_size);
+
+	if (kvm->arch.ram_alloc_start == MAP_FAILED)
+		die("Failed to map %lld bytes for guest memory (%d)",
+		    kvm->arch.ram_alloc_size, errno);
+
+	kvm->ram_start = (void *)ALIGN((unsigned long)kvm->arch.ram_alloc_start,
+					SZ_2M);
+
+	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
+		MADV_MERGEABLE);
+
+	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
+		MADV_HUGEPAGE);
 
 	phys_start	= ARM_MEMORY_AREA;
 	phys_size	= kvm->ram_size;
@@ -59,31 +84,6 @@ void kvm__arch_set_cmdline(char *cmdline, bool video)
 
 void kvm__arch_init(struct kvm *kvm)
 {
-	/*
-	 * Allocate guest memory. We must align our buffer to 64K to
-	 * correlate with the maximum guest page size for virtio-mmio.
-	 * If using THP, then our minimal alignment becomes 2M.
-	 * 2M trumps 64K, so let's go with that.
-	 */
-	kvm->ram_size = kvm->cfg.ram_size;
-	kvm->arch.ram_alloc_size = kvm->ram_size + SZ_2M;
-	kvm->arch.ram_alloc_start = mmap_anon_or_hugetlbfs(kvm,
-						kvm->cfg.hugetlbfs_path,
-						kvm->arch.ram_alloc_size);
-
-	if (kvm->arch.ram_alloc_start == MAP_FAILED)
-		die("Failed to map %lld bytes for guest memory (%d)",
-		    kvm->arch.ram_alloc_size, errno);
-
-	kvm->ram_start = (void *)ALIGN((unsigned long)kvm->arch.ram_alloc_start,
-					SZ_2M);
-
-	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
-		MADV_MERGEABLE);
-
-	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
-		MADV_HUGEPAGE);
-
 	/* Create the virtual GIC. */
 	if (gic__create(kvm, kvm->cfg.arch.irqchip))
 		die("Failed to create virtual GIC");
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 11/12] Introduce kvm__arch_default_ram_address()

[Alexandru Elisei]

Add a new function, kvm__arch_default_ram_address(), which returns the
default address for guest RAM for each architecture.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/aarch32/kvm.c | 5 +++++
 arm/aarch64/kvm.c | 5 +++++
 include/kvm/kvm.h | 1 +
 mips/kvm.c        | 5 +++++
 powerpc/kvm.c     | 5 +++++
 riscv/kvm.c       | 5 +++++
 x86/kvm.c         | 5 +++++
 7 files changed, 31 insertions(+)

diff --git a/arm/aarch32/kvm.c b/arm/aarch32/kvm.c
index 9d68d7a15ee2..768a56bbb5b4 100644
--- a/arm/aarch32/kvm.c
+++ b/arm/aarch32/kvm.c
@@ -7,3 +7,8 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
 		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
 	}
 }
+
+u64 kvm__arch_default_ram_address(void)
+{
+	return ARM_MEMORY_AREA;
+}
diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index 5db8e295c433..af8e7eae0da2 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -46,6 +46,11 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
 	}
 }
 
+u64 kvm__arch_default_ram_address(void)
+{
+	return ARM_MEMORY_AREA;
+}
+
 /*
  * Return the TEXT_OFFSET value that the guest kernel expects. Note
  * that pre-3.17 kernels expose this value using the native endianness
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 640b76c095f9..360430b78b1e 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -190,6 +190,7 @@ void kvm__remove_socket(const char *name);
 void kvm__arch_validate_cfg(struct kvm *kvm);
 void kvm__arch_set_cmdline(char *cmdline, bool video);
 void kvm__arch_init(struct kvm *kvm);
+u64 kvm__arch_default_ram_address(void);
 void kvm__arch_delete_ram(struct kvm *kvm);
 int kvm__arch_setup_firmware(struct kvm *kvm);
 int kvm__arch_free_firmware(struct kvm *kvm);
diff --git a/mips/kvm.c b/mips/kvm.c
index d8610cf81b94..4cbc9907731b 100644
--- a/mips/kvm.c
+++ b/mips/kvm.c
@@ -12,6 +12,11 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+u64 kvm__arch_default_ram_address(void)
+{
+	return 0;
+}
+
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
 }
diff --git a/powerpc/kvm.c b/powerpc/kvm.c
index d281b070fd0e..7b0d0669aff4 100644
--- a/powerpc/kvm.c
+++ b/powerpc/kvm.c
@@ -48,6 +48,11 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+u64 kvm__arch_default_ram_address(void)
+{
+	return 0;
+}
+
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
 }
diff --git a/riscv/kvm.c b/riscv/kvm.c
index c46660772aa0..4d6f5cb57ac8 100644
--- a/riscv/kvm.c
+++ b/riscv/kvm.c
@@ -13,6 +13,11 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 },
 };
 
+u64 kvm__arch_default_ram_address(void)
+{
+	return RISCV_RAM;
+}
+
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
 }
diff --git a/x86/kvm.c b/x86/kvm.c
index 24b0305a1841..328fa7500596 100644
--- a/x86/kvm.c
+++ b/x86/kvm.c
@@ -35,6 +35,11 @@ struct kvm_ext kvm_req_ext[] = {
 	{ 0, 0 }
 };
 
+u64 kvm__arch_default_ram_address(void)
+{
+	return 0;
+}
+
 void kvm__arch_validate_cfg(struct kvm *kvm)
 {
 }
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

[PATCH v2 kvmtool 12/12] arm64: Allow the user to specify the RAM base address

[Alexandru Elisei]

Allow the user to specify the RAM base address by using -m/--mem size@addr
command line argument. The base address must be above 2GB, as to not
overlap with the MMIO I/O region.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/aarch64/include/kvm/kvm-arch.h |  2 ++
 arm/aarch64/kvm.c                  |  5 ++++-
 arm/kvm.c                          |  7 +++++--
 builtin-run.c                      | 29 +++++++++++++++++++++++++----
 include/kvm/kvm-config.h           |  1 +
 include/kvm/kvm.h                  | 12 ++++++++++++
 6 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
index ff857ca6e7b4..02d09a413831 100644
--- a/arm/aarch64/include/kvm/kvm-arch.h
+++ b/arm/aarch64/include/kvm/kvm-arch.h
@@ -10,6 +10,8 @@ void kvm__arch_enable_mte(struct kvm *kvm);
 
 #define MAX_PAGE_SIZE	SZ_64K
 
+#define ARCH_HAS_CFG_RAM_ADDRESS	1
+
 #include "arm-common/kvm-arch.h"
 
 #endif /* KVM__KVM_ARCH_H */
diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index af8e7eae0da2..14ffae9e39dc 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -44,6 +44,9 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
 		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
 		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
 	}
+
+	if (kvm->cfg.ram_addr < ARM_MEMORY_AREA)
+		die("RAM address is below %luGB", ARM_MEMORY_AREA >> 30);
 }
 
 u64 kvm__arch_default_ram_address(void)
@@ -117,7 +120,7 @@ int kvm__get_vm_type(struct kvm *kvm)
 		return 0;
 
 	/* Otherwise, compute the minimal required IPA size */
-	max_ipa = ARM_MEMORY_AREA + kvm->cfg.ram_size - 1;
+	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);
diff --git a/arm/kvm.c b/arm/kvm.c
index abcccfabf59e..d51cc15d8b1c 100644
--- a/arm/kvm.c
+++ b/arm/kvm.c
@@ -55,7 +55,7 @@ void kvm__init_ram(struct kvm *kvm)
 	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
 		MADV_HUGEPAGE);
 
-	phys_start	= ARM_MEMORY_AREA;
+	phys_start	= kvm->cfg.ram_addr;
 	phys_size	= kvm->ram_size;
 	host_mem	= kvm->ram_start;
 
@@ -65,6 +65,9 @@ void kvm__init_ram(struct kvm *kvm)
 		    "address 0x%llx [err %d]", phys_size, phys_start, err);
 
 	kvm->arch.memory_guest_start = phys_start;
+
+	pr_debug("RAM created at 0x%llx - 0x%llx",
+		 phys_start, phys_start + phys_size - 1);
 }
 
 void kvm__arch_delete_ram(struct kvm *kvm)
@@ -201,7 +204,7 @@ bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename)
 
 	/* For default firmware address, lets load it at the begining of RAM */
 	if (fw_addr == 0)
-		fw_addr = ARM_MEMORY_AREA;
+		fw_addr = kvm->arch.memory_guest_start;
 
 	if (!validate_fw_addr(kvm, fw_addr))
 		die("Bad firmware destination: 0x%016llx", fw_addr);
diff --git a/builtin-run.c b/builtin-run.c
index 57c58be55159..26e6e9974009 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -131,12 +131,22 @@ static u64 parse_mem_option(const char *nptr, char **next)
 static int mem_parser(const struct option *opt, const char *arg, int unset)
 {
 	struct kvm *kvm = opt->ptr;
-	char *next;
+	char *next, *nptr;
 
 	kvm->cfg.ram_size = parse_mem_option(arg, &next);
 	if (kvm->cfg.ram_size == 0)
 		die("Invalid RAM size: %s", arg);
 
+	kvm->cfg.ram_addr = kvm__arch_default_ram_address();
+	if (kvm__arch_has_cfg_ram_address() && *next == '@') {
+		next++;
+		if (*next == '\0')
+			die("Missing memory address: %s", arg);
+
+		nptr = next;
+		kvm->cfg.ram_addr = parse_mem_option(nptr, &next);
+	}
+
 	if (*next != '\0')
 		die("Invalid memory specifier: %s", arg);
 
@@ -147,15 +157,26 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
 #define OPT_ARCH_RUN(...)
 #endif
 
+#ifdef ARCH_HAS_CFG_RAM_ADDRESS
+#define MEM_OPT_HELP_SHORT	"size[BKMGTP][@addr[BKMGTP]]"
+#define MEM_OPT_HELP_LONG						\
+	"Virtual machine memory size and optional base address, both"	\
+	" measured by default in megabytes (M)"
+#else
+#define MEM_OPT_HELP_SHORT	"size[BKMGTP]"
+#define MEM_OPT_HELP_LONG						\
+	"Virtual machine memory size, by default measured in"		\
+	" in megabytes (M)"
+#endif
+
 #define BUILD_OPTIONS(name, cfg, kvm)					\
 	struct option name[] = {					\
 	OPT_GROUP("Basic options:"),					\
 	OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name",	\
 			"A name for the guest"),			\
 	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
-	OPT_CALLBACK('m', "mem", NULL, "size[BKMGTP]",			\
-		     "Virtual machine memory size, by default measured"	\
-		     " in megabytes (M)", mem_parser, kvm),		\
+	OPT_CALLBACK('m', "mem", NULL, MEM_OPT_HELP_SHORT,		\
+		     MEM_OPT_HELP_LONG, mem_parser, kvm),		\
 	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
 			" image or rootfs directory", img_name_parser,	\
 			kvm),						\
diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
index 31bc89520d52..45fe1caaebce 100644
--- a/include/kvm/kvm-config.h
+++ b/include/kvm/kvm-config.h
@@ -23,6 +23,7 @@ struct kvm_config {
 	struct kvm_config_arch arch;
 	struct disk_image_params disk_image[MAX_DISK_IMAGES];
 	struct vfio_device_params *vfio_devices;
+	u64 ram_addr;		/* Guest memory physical base address, in bytes */
 	u64 ram_size;		/* Guest memory size, in bytes */
 	u8 num_net_devices;
 	u8 num_vfio_devices;
diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
index 360430b78b1e..eb23e2f77310 100644
--- a/include/kvm/kvm.h
+++ b/include/kvm/kvm.h
@@ -197,6 +197,18 @@ int kvm__arch_free_firmware(struct kvm *kvm);
 bool kvm__arch_cpu_supports_vm(void);
 void kvm__arch_read_term(struct kvm *kvm);
 
+#ifdef ARCH_HAS_CFG_RAM_ADDRESS
+static inline bool kvm__arch_has_cfg_ram_address(void)
+{
+	return true;
+}
+#else
+static inline bool kvm__arch_has_cfg_ram_address(void)
+{
+	return false;
+}
+#endif
+
 void *guest_flat_to_host(struct kvm *kvm, u64 offset);
 u64 host_to_guest_flat(struct kvm *kvm, void *ptr);
 
-- 
2.36.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v2 kvmtool 12/12] arm64: Allow the user to specify the RAM base address

[Andre Przywara]

On Mon, 16 May 2022 16:55:26 +0100
Alexandru Elisei <alexandru.elisei@arm.com> wrote:

Hi,

> Allow the user to specify the RAM base address by using -m/--mem size@addr
> command line argument. The base address must be above 2GB, as to not
> overlap with the MMIO I/O region.

Just started to play with this, in general the series looks good to me on
a first glance. I will review in anger next week.
Meanwhile: when you start kvmtool without explicitly specifying a ram size
on the command line, the code misses to initialise cfg.ram_addr, so it
stays at 0 and kvmtool reports:
  Fatal: RAM address is below 2GB
One possible fix would be to initialise this in get_ram_size() to
kvm__arch_default_ram_address(), I guess, but you might find a better solution.

Cheers,
Andre

> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
> ---
>  arm/aarch64/include/kvm/kvm-arch.h |  2 ++
>  arm/aarch64/kvm.c                  |  5 ++++-
>  arm/kvm.c                          |  7 +++++--
>  builtin-run.c                      | 29 +++++++++++++++++++++++++----
>  include/kvm/kvm-config.h           |  1 +
>  include/kvm/kvm.h                  | 12 ++++++++++++
>  6 files changed, 49 insertions(+), 7 deletions(-)
> 
> diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
> index ff857ca6e7b4..02d09a413831 100644
> --- a/arm/aarch64/include/kvm/kvm-arch.h
> +++ b/arm/aarch64/include/kvm/kvm-arch.h
> @@ -10,6 +10,8 @@ void kvm__arch_enable_mte(struct kvm *kvm);
>  
>  #define MAX_PAGE_SIZE	SZ_64K
>  
> +#define ARCH_HAS_CFG_RAM_ADDRESS	1
> +
>  #include "arm-common/kvm-arch.h"
>  
>  #endif /* KVM__KVM_ARCH_H */
> diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
> index af8e7eae0da2..14ffae9e39dc 100644
> --- a/arm/aarch64/kvm.c
> +++ b/arm/aarch64/kvm.c
> @@ -44,6 +44,9 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
>  		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
>  		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
>  	}
> +
> +	if (kvm->cfg.ram_addr < ARM_MEMORY_AREA)
> +		die("RAM address is below %luGB", ARM_MEMORY_AREA >> 30);
>  }
>  
>  u64 kvm__arch_default_ram_address(void)
> @@ -117,7 +120,7 @@ int kvm__get_vm_type(struct kvm *kvm)
>  		return 0;
>  
>  	/* Otherwise, compute the minimal required IPA size */
> -	max_ipa = ARM_MEMORY_AREA + kvm->cfg.ram_size - 1;
> +	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);
> diff --git a/arm/kvm.c b/arm/kvm.c
> index abcccfabf59e..d51cc15d8b1c 100644
> --- a/arm/kvm.c
> +++ b/arm/kvm.c
> @@ -55,7 +55,7 @@ void kvm__init_ram(struct kvm *kvm)
>  	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
>  		MADV_HUGEPAGE);
>  
> -	phys_start	= ARM_MEMORY_AREA;
> +	phys_start	= kvm->cfg.ram_addr;
>  	phys_size	= kvm->ram_size;
>  	host_mem	= kvm->ram_start;
>  
> @@ -65,6 +65,9 @@ void kvm__init_ram(struct kvm *kvm)
>  		    "address 0x%llx [err %d]", phys_size, phys_start, err);
>  
>  	kvm->arch.memory_guest_start = phys_start;
> +
> +	pr_debug("RAM created at 0x%llx - 0x%llx",
> +		 phys_start, phys_start + phys_size - 1);
>  }
>  
>  void kvm__arch_delete_ram(struct kvm *kvm)
> @@ -201,7 +204,7 @@ bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename)
>  
>  	/* For default firmware address, lets load it at the begining of RAM */
>  	if (fw_addr == 0)
> -		fw_addr = ARM_MEMORY_AREA;
> +		fw_addr = kvm->arch.memory_guest_start;
>  
>  	if (!validate_fw_addr(kvm, fw_addr))
>  		die("Bad firmware destination: 0x%016llx", fw_addr);
> diff --git a/builtin-run.c b/builtin-run.c
> index 57c58be55159..26e6e9974009 100644
> --- a/builtin-run.c
> +++ b/builtin-run.c
> @@ -131,12 +131,22 @@ static u64 parse_mem_option(const char *nptr, char **next)
>  static int mem_parser(const struct option *opt, const char *arg, int unset)
>  {
>  	struct kvm *kvm = opt->ptr;
> -	char *next;
> +	char *next, *nptr;
>  
>  	kvm->cfg.ram_size = parse_mem_option(arg, &next);
>  	if (kvm->cfg.ram_size == 0)
>  		die("Invalid RAM size: %s", arg);
>  
> +	kvm->cfg.ram_addr = kvm__arch_default_ram_address();
> +	if (kvm__arch_has_cfg_ram_address() && *next == '@') {
> +		next++;
> +		if (*next == '\0')
> +			die("Missing memory address: %s", arg);
> +
> +		nptr = next;
> +		kvm->cfg.ram_addr = parse_mem_option(nptr, &next);
> +	}
> +
>  	if (*next != '\0')
>  		die("Invalid memory specifier: %s", arg);
>  
> @@ -147,15 +157,26 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
>  #define OPT_ARCH_RUN(...)
>  #endif
>  
> +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> +#define MEM_OPT_HELP_SHORT	"size[BKMGTP][@addr[BKMGTP]]"
> +#define MEM_OPT_HELP_LONG						\
> +	"Virtual machine memory size and optional base address, both"	\
> +	" measured by default in megabytes (M)"
> +#else
> +#define MEM_OPT_HELP_SHORT	"size[BKMGTP]"
> +#define MEM_OPT_HELP_LONG						\
> +	"Virtual machine memory size, by default measured in"		\
> +	" in megabytes (M)"
> +#endif
> +
>  #define BUILD_OPTIONS(name, cfg, kvm)					\
>  	struct option name[] = {					\
>  	OPT_GROUP("Basic options:"),					\
>  	OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name",	\
>  			"A name for the guest"),			\
>  	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
> -	OPT_CALLBACK('m', "mem", NULL, "size[BKMGTP]",			\
> -		     "Virtual machine memory size, by default measured"	\
> -		     " in megabytes (M)", mem_parser, kvm),		\
> +	OPT_CALLBACK('m', "mem", NULL, MEM_OPT_HELP_SHORT,		\
> +		     MEM_OPT_HELP_LONG, mem_parser, kvm),		\
>  	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
>  			" image or rootfs directory", img_name_parser,	\
>  			kvm),						\
> diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
> index 31bc89520d52..45fe1caaebce 100644
> --- a/include/kvm/kvm-config.h
> +++ b/include/kvm/kvm-config.h
> @@ -23,6 +23,7 @@ struct kvm_config {
>  	struct kvm_config_arch arch;
>  	struct disk_image_params disk_image[MAX_DISK_IMAGES];
>  	struct vfio_device_params *vfio_devices;
> +	u64 ram_addr;		/* Guest memory physical base address, in bytes */
>  	u64 ram_size;		/* Guest memory size, in bytes */
>  	u8 num_net_devices;
>  	u8 num_vfio_devices;
> diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> index 360430b78b1e..eb23e2f77310 100644
> --- a/include/kvm/kvm.h
> +++ b/include/kvm/kvm.h
> @@ -197,6 +197,18 @@ int kvm__arch_free_firmware(struct kvm *kvm);
>  bool kvm__arch_cpu_supports_vm(void);
>  void kvm__arch_read_term(struct kvm *kvm);
>  
> +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> +static inline bool kvm__arch_has_cfg_ram_address(void)
> +{
> +	return true;
> +}
> +#else
> +static inline bool kvm__arch_has_cfg_ram_address(void)
> +{
> +	return false;
> +}
> +#endif
> +
>  void *guest_flat_to_host(struct kvm *kvm, u64 offset);
>  u64 host_to_guest_flat(struct kvm *kvm, void *ptr);
>  


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v2 kvmtool 12/12] arm64: Allow the user to specify the RAM base address

[Alexandru Elisei]

Hi Andre,

Thank you for having a look!

On Fri, May 20, 2022 at 06:20:15PM +0100, Andre Przywara wrote:
> On Mon, 16 May 2022 16:55:26 +0100
> Alexandru Elisei <alexandru.elisei@arm.com> wrote:
> 
> Hi,
> 
> > Allow the user to specify the RAM base address by using -m/--mem size@addr
> > command line argument. The base address must be above 2GB, as to not
> > overlap with the MMIO I/O region.
> 
> Just started to play with this, in general the series looks good to me on
> a first glance. I will review in anger next week.
> Meanwhile: when you start kvmtool without explicitly specifying a ram size
> on the command line, the code misses to initialise cfg.ram_addr, so it
> stays at 0 and kvmtool reports:
>   Fatal: RAM address is below 2GB
> One possible fix would be to initialise this in get_ram_size() to
> kvm__arch_default_ram_address(), I guess, but you might find a better solution.

This is indeed an issue. I usually specify the number of vcpus and the
memory size when I create a VM, and I overlooked what happens with the
default values. I will incorporate this scenario into my testing.

Will send an updated series with the bug fixed as soon as possible. In the
meantime, this fixed the issue for me and I plan to incorporate it into the
series after more testing:

diff --git a/builtin-run.c b/builtin-run.c
index 26e6e9974009..36a255bc14f9 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -137,7 +137,6 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
        if (kvm->cfg.ram_size == 0)
                die("Invalid RAM size: %s", arg);

-       kvm->cfg.ram_addr = kvm__arch_default_ram_address();
        if (kvm__arch_has_cfg_ram_address() && *next == '@') {
                next++;
                if (*next == '\0')
@@ -622,6 +621,7 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)

        nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
        kvm->cfg.custom_rootfs_name = "default";
+       kvm->cfg.ram_addr = kvm__arch_default_ram_address();

        while (argc != 0) {
                BUILD_OPTIONS(options, &kvm->cfg, kvm);

Thanks,
Alex

> 
> Cheers,
> Andre
> 
> > 
> > Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
> > ---
> >  arm/aarch64/include/kvm/kvm-arch.h |  2 ++
> >  arm/aarch64/kvm.c                  |  5 ++++-
> >  arm/kvm.c                          |  7 +++++--
> >  builtin-run.c                      | 29 +++++++++++++++++++++++++----
> >  include/kvm/kvm-config.h           |  1 +
> >  include/kvm/kvm.h                  | 12 ++++++++++++
> >  6 files changed, 49 insertions(+), 7 deletions(-)
> > 
> > diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
> > index ff857ca6e7b4..02d09a413831 100644
> > --- a/arm/aarch64/include/kvm/kvm-arch.h
> > +++ b/arm/aarch64/include/kvm/kvm-arch.h
> > @@ -10,6 +10,8 @@ void kvm__arch_enable_mte(struct kvm *kvm);
> >  
> >  #define MAX_PAGE_SIZE	SZ_64K
> >  
> > +#define ARCH_HAS_CFG_RAM_ADDRESS	1
> > +
> >  #include "arm-common/kvm-arch.h"
> >  
> >  #endif /* KVM__KVM_ARCH_H */
> > diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
> > index af8e7eae0da2..14ffae9e39dc 100644
> > --- a/arm/aarch64/kvm.c
> > +++ b/arm/aarch64/kvm.c
> > @@ -44,6 +44,9 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
> >  		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
> >  		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
> >  	}
> > +
> > +	if (kvm->cfg.ram_addr < ARM_MEMORY_AREA)
> > +		die("RAM address is below %luGB", ARM_MEMORY_AREA >> 30);
> >  }
> >  
> >  u64 kvm__arch_default_ram_address(void)
> > @@ -117,7 +120,7 @@ int kvm__get_vm_type(struct kvm *kvm)
> >  		return 0;
> >  
> >  	/* Otherwise, compute the minimal required IPA size */
> > -	max_ipa = ARM_MEMORY_AREA + kvm->cfg.ram_size - 1;
> > +	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);
> > diff --git a/arm/kvm.c b/arm/kvm.c
> > index abcccfabf59e..d51cc15d8b1c 100644
> > --- a/arm/kvm.c
> > +++ b/arm/kvm.c
> > @@ -55,7 +55,7 @@ void kvm__init_ram(struct kvm *kvm)
> >  	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
> >  		MADV_HUGEPAGE);
> >  
> > -	phys_start	= ARM_MEMORY_AREA;
> > +	phys_start	= kvm->cfg.ram_addr;
> >  	phys_size	= kvm->ram_size;
> >  	host_mem	= kvm->ram_start;
> >  
> > @@ -65,6 +65,9 @@ void kvm__init_ram(struct kvm *kvm)
> >  		    "address 0x%llx [err %d]", phys_size, phys_start, err);
> >  
> >  	kvm->arch.memory_guest_start = phys_start;
> > +
> > +	pr_debug("RAM created at 0x%llx - 0x%llx",
> > +		 phys_start, phys_start + phys_size - 1);
> >  }
> >  
> >  void kvm__arch_delete_ram(struct kvm *kvm)
> > @@ -201,7 +204,7 @@ bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename)
> >  
> >  	/* For default firmware address, lets load it at the begining of RAM */
> >  	if (fw_addr == 0)
> > -		fw_addr = ARM_MEMORY_AREA;
> > +		fw_addr = kvm->arch.memory_guest_start;
> >  
> >  	if (!validate_fw_addr(kvm, fw_addr))
> >  		die("Bad firmware destination: 0x%016llx", fw_addr);
> > diff --git a/builtin-run.c b/builtin-run.c
> > index 57c58be55159..26e6e9974009 100644
> > --- a/builtin-run.c
> > +++ b/builtin-run.c
> > @@ -131,12 +131,22 @@ static u64 parse_mem_option(const char *nptr, char **next)
> >  static int mem_parser(const struct option *opt, const char *arg, int unset)
> >  {
> >  	struct kvm *kvm = opt->ptr;
> > -	char *next;
> > +	char *next, *nptr;
> >  
> >  	kvm->cfg.ram_size = parse_mem_option(arg, &next);
> >  	if (kvm->cfg.ram_size == 0)
> >  		die("Invalid RAM size: %s", arg);
> >  
> > +	kvm->cfg.ram_addr = kvm__arch_default_ram_address();
> > +	if (kvm__arch_has_cfg_ram_address() && *next == '@') {
> > +		next++;
> > +		if (*next == '\0')
> > +			die("Missing memory address: %s", arg);
> > +
> > +		nptr = next;
> > +		kvm->cfg.ram_addr = parse_mem_option(nptr, &next);
> > +	}
> > +
> >  	if (*next != '\0')
> >  		die("Invalid memory specifier: %s", arg);
> >  
> > @@ -147,15 +157,26 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
> >  #define OPT_ARCH_RUN(...)
> >  #endif
> >  
> > +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> > +#define MEM_OPT_HELP_SHORT	"size[BKMGTP][@addr[BKMGTP]]"
> > +#define MEM_OPT_HELP_LONG						\
> > +	"Virtual machine memory size and optional base address, both"	\
> > +	" measured by default in megabytes (M)"
> > +#else
> > +#define MEM_OPT_HELP_SHORT	"size[BKMGTP]"
> > +#define MEM_OPT_HELP_LONG						\
> > +	"Virtual machine memory size, by default measured in"		\
> > +	" in megabytes (M)"
> > +#endif
> > +
> >  #define BUILD_OPTIONS(name, cfg, kvm)					\
> >  	struct option name[] = {					\
> >  	OPT_GROUP("Basic options:"),					\
> >  	OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name",	\
> >  			"A name for the guest"),			\
> >  	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
> > -	OPT_CALLBACK('m', "mem", NULL, "size[BKMGTP]",			\
> > -		     "Virtual machine memory size, by default measured"	\
> > -		     " in megabytes (M)", mem_parser, kvm),		\
> > +	OPT_CALLBACK('m', "mem", NULL, MEM_OPT_HELP_SHORT,		\
> > +		     MEM_OPT_HELP_LONG, mem_parser, kvm),		\
> >  	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
> >  			" image or rootfs directory", img_name_parser,	\
> >  			kvm),						\
> > diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
> > index 31bc89520d52..45fe1caaebce 100644
> > --- a/include/kvm/kvm-config.h
> > +++ b/include/kvm/kvm-config.h
> > @@ -23,6 +23,7 @@ struct kvm_config {
> >  	struct kvm_config_arch arch;
> >  	struct disk_image_params disk_image[MAX_DISK_IMAGES];
> >  	struct vfio_device_params *vfio_devices;
> > +	u64 ram_addr;		/* Guest memory physical base address, in bytes */
> >  	u64 ram_size;		/* Guest memory size, in bytes */
> >  	u8 num_net_devices;
> >  	u8 num_vfio_devices;
> > diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> > index 360430b78b1e..eb23e2f77310 100644
> > --- a/include/kvm/kvm.h
> > +++ b/include/kvm/kvm.h
> > @@ -197,6 +197,18 @@ int kvm__arch_free_firmware(struct kvm *kvm);
> >  bool kvm__arch_cpu_supports_vm(void);
> >  void kvm__arch_read_term(struct kvm *kvm);
> >  
> > +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> > +static inline bool kvm__arch_has_cfg_ram_address(void)
> > +{
> > +	return true;
> > +}
> > +#else
> > +static inline bool kvm__arch_has_cfg_ram_address(void)
> > +{
> > +	return false;
> > +}
> > +#endif
> > +
> >  void *guest_flat_to_host(struct kvm *kvm, u64 offset);
> >  u64 host_to_guest_flat(struct kvm *kvm, void *ptr);
> >  
> 

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v2 kvmtool 02/12] builtin-run: Always use RAM size in bytes

[Andre Przywara]

On Mon, 16 May 2022 16:55:16 +0100
Alexandru Elisei <alexandru.elisei@arm.com> wrote:

> The user can specify the virtual machine memory size in MB, which is saved
> in cfg->ram_size. kvmtool validates it against the host memory size,
> converted from bytes to MB. ram_size is then converted to bytes, and this
> is how it is used throughout the rest of kvmtool.
> 
> To avoid any confusion about the unit of measurement, especially once the
> user is allowed to specify the unit of measurement, always use ram_size in
> bytes.
> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
> ---
>  builtin-run.c            | 19 ++++++++++---------
>  include/kvm/kvm-config.h |  7 ++++---
>  include/kvm/kvm.h        |  2 +-
>  3 files changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/builtin-run.c b/builtin-run.c
> index 0126c9fbcba6..236c59d2f86f 100644
> --- a/builtin-run.c
> +++ b/builtin-run.c
> @@ -36,6 +36,7 @@
>  
>  #include <linux/types.h>
>  #include <linux/err.h>
> +#include <linux/sizes.h>
>  
>  #include <sys/utsname.h>
>  #include <sys/types.h>
> @@ -264,7 +265,7 @@ static u64 host_ram_size(void)
>  		return 0;
>  	}
>  
> -	return (nr_pages * page_size) >> MB_SHIFT;
> +	return nr_pages * page_size;

So while looking for potential overflows on 32-bit systems, I realised
that this was already broken: On my Calxeda Highbank (arm32) with 8GB of
memory, this returns a negative number, because of the signed longs.
Can you cast nr_pages to u64 while at it, to fix that? I don't think we
need a separate patch for that ...

>  }
>  
>  /*
> @@ -278,11 +279,11 @@ static u64 get_ram_size(int nr_cpus)
>  	u64 available;
>  	u64 ram_size;
>  
> -	ram_size	= 64 * (nr_cpus + 3);
> +	ram_size	= SZ_64M * (nr_cpus + 3);

This overflows on 32-bit system starting with 29 vCPUs. If you use "3ULL",
this problem goes away.

Cheers,
Andre

>  
>  	available	= host_ram_size() * RAM_SIZE_RATIO;
>  	if (!available)
> -		available = MIN_RAM_SIZE_MB;
> +		available = MIN_RAM_SIZE;
>  
>  	if (ram_size > available)
>  		ram_size	= available;
> @@ -595,13 +596,13 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
>  
>  	if (!kvm->cfg.ram_size)
>  		kvm->cfg.ram_size = get_ram_size(kvm->cfg.nrcpus);
> +	else
> +		kvm->cfg.ram_size <<= MB_SHIFT;
>  
>  	if (kvm->cfg.ram_size > host_ram_size())
>  		pr_warning("Guest memory size %lluMB exceeds host physical RAM size %lluMB",
> -			(unsigned long long)kvm->cfg.ram_size,
> -			(unsigned long long)host_ram_size());
> -
> -	kvm->cfg.ram_size <<= MB_SHIFT;
> +			(unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
> +			(unsigned long long)host_ram_size() >> MB_SHIFT);
>  
>  	if (!kvm->cfg.dev)
>  		kvm->cfg.dev = DEFAULT_KVM_DEV;
> @@ -676,12 +677,12 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
>  	if (kvm->cfg.kernel_filename) {
>  		printf("  # %s run -k %s -m %Lu -c %d --name %s\n", KVM_BINARY_NAME,
>  		       kvm->cfg.kernel_filename,
> -		       (unsigned long long)kvm->cfg.ram_size / 1024 / 1024,
> +		       (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
>  		       kvm->cfg.nrcpus, kvm->cfg.guest_name);
>  	} else if (kvm->cfg.firmware_filename) {
>  		printf("  # %s run --firmware %s -m %Lu -c %d --name %s\n", KVM_BINARY_NAME,
>  		       kvm->cfg.firmware_filename,
> -		       (unsigned long long)kvm->cfg.ram_size / 1024 / 1024,
> +		       (unsigned long long)kvm->cfg.ram_size >> MB_SHIFT,
>  		       kvm->cfg.nrcpus, kvm->cfg.guest_name);
>  	}
>  
> diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
> index 6a5720c4c7d4..31bc89520d52 100644
> --- a/include/kvm/kvm-config.h
> +++ b/include/kvm/kvm-config.h
> @@ -5,6 +5,8 @@
>  #include "kvm/vfio.h"
>  #include "kvm/kvm-config-arch.h"
>  
> +#include <linux/sizes.h>
> +
>  #define DEFAULT_KVM_DEV		"/dev/kvm"
>  #define DEFAULT_CONSOLE		"serial"
>  #define DEFAULT_NETWORK		"user"
> @@ -15,14 +17,13 @@
>  #define DEFAULT_SCRIPT		"none"
>  #define DEFAULT_SANDBOX_FILENAME "guest/sandbox.sh"
>  
> -#define MIN_RAM_SIZE_MB		(64ULL)
> -#define MIN_RAM_SIZE_BYTE	(MIN_RAM_SIZE_MB << MB_SHIFT)
> +#define MIN_RAM_SIZE		SZ_64M
>  
>  struct kvm_config {
>  	struct kvm_config_arch arch;
>  	struct disk_image_params disk_image[MAX_DISK_IMAGES];
>  	struct vfio_device_params *vfio_devices;
> -	u64 ram_size;
> +	u64 ram_size;		/* Guest memory size, in bytes */
>  	u8 num_net_devices;
>  	u8 num_vfio_devices;
>  	u64 vsock_cid;
> diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> index ad732e56f5ed..7b14b33b50ca 100644
> --- a/include/kvm/kvm.h
> +++ b/include/kvm/kvm.h
> @@ -87,7 +87,7 @@ struct kvm {
>  	struct kvm_cpu		**cpus;
>  
>  	u32			mem_slots;	/* for KVM_SET_USER_MEMORY_REGION */
> -	u64			ram_size;
> +	u64			ram_size;	/* Guest memory size, in bytes */
>  	void			*ram_start;
>  	u64			ram_pagesize;
>  	struct mutex		mem_banks_lock;


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

Re: [PATCH v2 kvmtool 12/12] arm64: Allow the user to specify the RAM base address

[Alexandru Elisei]

Hi,

Pushed an updated branch [1] with the fix below and another fix for
checking when memory exceeds 4GB on aarch32. Minimally tested while I put
my testing scripts in order.

[1] https://gitlab.arm.com/linux-arm/kvmtool-ae/-/tree/arm-allow-the-user-to-define-ram-address-v3-wip1

Thanks,
Alex

On Mon, May 23, 2022 at 09:55:30AM +0100, Alexandru Elisei wrote:
> Hi Andre,
> 
> Thank you for having a look!
> 
> On Fri, May 20, 2022 at 06:20:15PM +0100, Andre Przywara wrote:
> > On Mon, 16 May 2022 16:55:26 +0100
> > Alexandru Elisei <alexandru.elisei@arm.com> wrote:
> > 
> > Hi,
> > 
> > > Allow the user to specify the RAM base address by using -m/--mem size@addr
> > > command line argument. The base address must be above 2GB, as to not
> > > overlap with the MMIO I/O region.
> > 
> > Just started to play with this, in general the series looks good to me on
> > a first glance. I will review in anger next week.
> > Meanwhile: when you start kvmtool without explicitly specifying a ram size
> > on the command line, the code misses to initialise cfg.ram_addr, so it
> > stays at 0 and kvmtool reports:
> >   Fatal: RAM address is below 2GB
> > One possible fix would be to initialise this in get_ram_size() to
> > kvm__arch_default_ram_address(), I guess, but you might find a better solution.
> 
> This is indeed an issue. I usually specify the number of vcpus and the
> memory size when I create a VM, and I overlooked what happens with the
> default values. I will incorporate this scenario into my testing.
> 
> Will send an updated series with the bug fixed as soon as possible. In the
> meantime, this fixed the issue for me and I plan to incorporate it into the
> series after more testing:
> 
> diff --git a/builtin-run.c b/builtin-run.c
> index 26e6e9974009..36a255bc14f9 100644
> --- a/builtin-run.c
> +++ b/builtin-run.c
> @@ -137,7 +137,6 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
>         if (kvm->cfg.ram_size == 0)
>                 die("Invalid RAM size: %s", arg);
> 
> -       kvm->cfg.ram_addr = kvm__arch_default_ram_address();
>         if (kvm__arch_has_cfg_ram_address() && *next == '@') {
>                 next++;
>                 if (*next == '\0')
> @@ -622,6 +621,7 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
> 
>         nr_online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
>         kvm->cfg.custom_rootfs_name = "default";
> +       kvm->cfg.ram_addr = kvm__arch_default_ram_address();
> 
>         while (argc != 0) {
>                 BUILD_OPTIONS(options, &kvm->cfg, kvm);
> 
> Thanks,
> Alex
> 
> > 
> > Cheers,
> > Andre
> > 
> > > 
> > > Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
> > > ---
> > >  arm/aarch64/include/kvm/kvm-arch.h |  2 ++
> > >  arm/aarch64/kvm.c                  |  5 ++++-
> > >  arm/kvm.c                          |  7 +++++--
> > >  builtin-run.c                      | 29 +++++++++++++++++++++++++----
> > >  include/kvm/kvm-config.h           |  1 +
> > >  include/kvm/kvm.h                  | 12 ++++++++++++
> > >  6 files changed, 49 insertions(+), 7 deletions(-)
> > > 
> > > diff --git a/arm/aarch64/include/kvm/kvm-arch.h b/arm/aarch64/include/kvm/kvm-arch.h
> > > index ff857ca6e7b4..02d09a413831 100644
> > > --- a/arm/aarch64/include/kvm/kvm-arch.h
> > > +++ b/arm/aarch64/include/kvm/kvm-arch.h
> > > @@ -10,6 +10,8 @@ void kvm__arch_enable_mte(struct kvm *kvm);
> > >  
> > >  #define MAX_PAGE_SIZE	SZ_64K
> > >  
> > > +#define ARCH_HAS_CFG_RAM_ADDRESS	1
> > > +
> > >  #include "arm-common/kvm-arch.h"
> > >  
> > >  #endif /* KVM__KVM_ARCH_H */
> > > diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
> > > index af8e7eae0da2..14ffae9e39dc 100644
> > > --- a/arm/aarch64/kvm.c
> > > +++ b/arm/aarch64/kvm.c
> > > @@ -44,6 +44,9 @@ void kvm__arch_validate_cfg(struct kvm *kvm)
> > >  		die("RAM size 0x%llx exceeds maximum allowed 0x%llx",
> > >  		    kvm->cfg.ram_size, ARM_LOMAP_MAX_MEMORY);
> > >  	}
> > > +
> > > +	if (kvm->cfg.ram_addr < ARM_MEMORY_AREA)
> > > +		die("RAM address is below %luGB", ARM_MEMORY_AREA >> 30);
> > >  }
> > >  
> > >  u64 kvm__arch_default_ram_address(void)
> > > @@ -117,7 +120,7 @@ int kvm__get_vm_type(struct kvm *kvm)
> > >  		return 0;
> > >  
> > >  	/* Otherwise, compute the minimal required IPA size */
> > > -	max_ipa = ARM_MEMORY_AREA + kvm->cfg.ram_size - 1;
> > > +	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);
> > > diff --git a/arm/kvm.c b/arm/kvm.c
> > > index abcccfabf59e..d51cc15d8b1c 100644
> > > --- a/arm/kvm.c
> > > +++ b/arm/kvm.c
> > > @@ -55,7 +55,7 @@ void kvm__init_ram(struct kvm *kvm)
> > >  	madvise(kvm->arch.ram_alloc_start, kvm->arch.ram_alloc_size,
> > >  		MADV_HUGEPAGE);
> > >  
> > > -	phys_start	= ARM_MEMORY_AREA;
> > > +	phys_start	= kvm->cfg.ram_addr;
> > >  	phys_size	= kvm->ram_size;
> > >  	host_mem	= kvm->ram_start;
> > >  
> > > @@ -65,6 +65,9 @@ void kvm__init_ram(struct kvm *kvm)
> > >  		    "address 0x%llx [err %d]", phys_size, phys_start, err);
> > >  
> > >  	kvm->arch.memory_guest_start = phys_start;
> > > +
> > > +	pr_debug("RAM created at 0x%llx - 0x%llx",
> > > +		 phys_start, phys_start + phys_size - 1);
> > >  }
> > >  
> > >  void kvm__arch_delete_ram(struct kvm *kvm)
> > > @@ -201,7 +204,7 @@ bool kvm__load_firmware(struct kvm *kvm, const char *firmware_filename)
> > >  
> > >  	/* For default firmware address, lets load it at the begining of RAM */
> > >  	if (fw_addr == 0)
> > > -		fw_addr = ARM_MEMORY_AREA;
> > > +		fw_addr = kvm->arch.memory_guest_start;
> > >  
> > >  	if (!validate_fw_addr(kvm, fw_addr))
> > >  		die("Bad firmware destination: 0x%016llx", fw_addr);
> > > diff --git a/builtin-run.c b/builtin-run.c
> > > index 57c58be55159..26e6e9974009 100644
> > > --- a/builtin-run.c
> > > +++ b/builtin-run.c
> > > @@ -131,12 +131,22 @@ static u64 parse_mem_option(const char *nptr, char **next)
> > >  static int mem_parser(const struct option *opt, const char *arg, int unset)
> > >  {
> > >  	struct kvm *kvm = opt->ptr;
> > > -	char *next;
> > > +	char *next, *nptr;
> > >  
> > >  	kvm->cfg.ram_size = parse_mem_option(arg, &next);
> > >  	if (kvm->cfg.ram_size == 0)
> > >  		die("Invalid RAM size: %s", arg);
> > >  
> > > +	kvm->cfg.ram_addr = kvm__arch_default_ram_address();
> > > +	if (kvm__arch_has_cfg_ram_address() && *next == '@') {
> > > +		next++;
> > > +		if (*next == '\0')
> > > +			die("Missing memory address: %s", arg);
> > > +
> > > +		nptr = next;
> > > +		kvm->cfg.ram_addr = parse_mem_option(nptr, &next);
> > > +	}
> > > +
> > >  	if (*next != '\0')
> > >  		die("Invalid memory specifier: %s", arg);
> > >  
> > > @@ -147,15 +157,26 @@ static int mem_parser(const struct option *opt, const char *arg, int unset)
> > >  #define OPT_ARCH_RUN(...)
> > >  #endif
> > >  
> > > +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> > > +#define MEM_OPT_HELP_SHORT	"size[BKMGTP][@addr[BKMGTP]]"
> > > +#define MEM_OPT_HELP_LONG						\
> > > +	"Virtual machine memory size and optional base address, both"	\
> > > +	" measured by default in megabytes (M)"
> > > +#else
> > > +#define MEM_OPT_HELP_SHORT	"size[BKMGTP]"
> > > +#define MEM_OPT_HELP_LONG						\
> > > +	"Virtual machine memory size, by default measured in"		\
> > > +	" in megabytes (M)"
> > > +#endif
> > > +
> > >  #define BUILD_OPTIONS(name, cfg, kvm)					\
> > >  	struct option name[] = {					\
> > >  	OPT_GROUP("Basic options:"),					\
> > >  	OPT_STRING('\0', "name", &(cfg)->guest_name, "guest name",	\
> > >  			"A name for the guest"),			\
> > >  	OPT_INTEGER('c', "cpus", &(cfg)->nrcpus, "Number of CPUs"),	\
> > > -	OPT_CALLBACK('m', "mem", NULL, "size[BKMGTP]",			\
> > > -		     "Virtual machine memory size, by default measured"	\
> > > -		     " in megabytes (M)", mem_parser, kvm),		\
> > > +	OPT_CALLBACK('m', "mem", NULL, MEM_OPT_HELP_SHORT,		\
> > > +		     MEM_OPT_HELP_LONG, mem_parser, kvm),		\
> > >  	OPT_CALLBACK('d', "disk", kvm, "image or rootfs_dir", "Disk "	\
> > >  			" image or rootfs directory", img_name_parser,	\
> > >  			kvm),						\
> > > diff --git a/include/kvm/kvm-config.h b/include/kvm/kvm-config.h
> > > index 31bc89520d52..45fe1caaebce 100644
> > > --- a/include/kvm/kvm-config.h
> > > +++ b/include/kvm/kvm-config.h
> > > @@ -23,6 +23,7 @@ struct kvm_config {
> > >  	struct kvm_config_arch arch;
> > >  	struct disk_image_params disk_image[MAX_DISK_IMAGES];
> > >  	struct vfio_device_params *vfio_devices;
> > > +	u64 ram_addr;		/* Guest memory physical base address, in bytes */
> > >  	u64 ram_size;		/* Guest memory size, in bytes */
> > >  	u8 num_net_devices;
> > >  	u8 num_vfio_devices;
> > > diff --git a/include/kvm/kvm.h b/include/kvm/kvm.h
> > > index 360430b78b1e..eb23e2f77310 100644
> > > --- a/include/kvm/kvm.h
> > > +++ b/include/kvm/kvm.h
> > > @@ -197,6 +197,18 @@ int kvm__arch_free_firmware(struct kvm *kvm);
> > >  bool kvm__arch_cpu_supports_vm(void);
> > >  void kvm__arch_read_term(struct kvm *kvm);
> > >  
> > > +#ifdef ARCH_HAS_CFG_RAM_ADDRESS
> > > +static inline bool kvm__arch_has_cfg_ram_address(void)
> > > +{
> > > +	return true;
> > > +}
> > > +#else
> > > +static inline bool kvm__arch_has_cfg_ram_address(void)
> > > +{
> > > +	return false;
> > > +}
> > > +#endif
> > > +
> > >  void *guest_flat_to_host(struct kvm *kvm, u64 offset);
> > >  u64 host_to_guest_flat(struct kvm *kvm, void *ptr);
> > >  
> > 
> _______________________________________________
> kvmarm mailing list
> kvmarm@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel