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[Qemu-devel] [PULL v2 04/15] pc: limit DIMM address and size to page ali
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PULL v2 04/15] pc: limit DIMM address and size to page aligned values |
Date: |
Mon, 24 Nov 2014 21:30:51 +0200 |
From: Igor Mammedov <address@hidden>
When running in KVM mode, kvm_set_phys_mem() will silently
fail if registered MemoryRegion address/size is not page
aligned. Causing memory hotplug failure in guest.
Mapping non aligned MemoryRegion in TCG mode 'works', but
sane guest OS still expects page aligned memory module
and fails to initialize it if it's not aligned.
So do not allow non aligned (i.e. valid) address/size
values for DIMM to avoid either KVM failure or guest
issues caused by it.
Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/hw/mem/pc-dimm.h | 2 +-
hw/i386/pc.c | 3 ++-
hw/mem/pc-dimm.c | 14 +++++++++++++-
3 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/include/hw/mem/pc-dimm.h b/include/hw/mem/pc-dimm.h
index 761eeef..e1dcbbc 100644
--- a/include/hw/mem/pc-dimm.h
+++ b/include/hw/mem/pc-dimm.h
@@ -72,7 +72,7 @@ typedef struct PCDIMMDeviceClass {
uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
uint64_t address_space_size,
- uint64_t *hint, uint64_t size,
+ uint64_t *hint, uint64_t align, uint64_t size,
Error **errp);
int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 70ae3cf..33928b9 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1556,6 +1556,7 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
PCDIMMDevice *dimm = PC_DIMM(dev);
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryRegion *mr = ddc->get_memory_region(dimm);
+ uint64_t align = TARGET_PAGE_SIZE;
uint64_t addr;
addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP,
&local_err);
@@ -1565,7 +1566,7 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
addr = pc_dimm_get_free_addr(pcms->hotplug_memory_base,
memory_region_size(&pcms->hotplug_memory),
- !addr ? NULL : &addr,
+ !addr ? NULL : &addr, align,
memory_region_size(mr), &local_err);
if (local_err) {
goto out;
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index a800ea7..4944f0f 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -139,7 +139,7 @@ static int pc_dimm_built_list(Object *obj, void *opaque)
uint64_t pc_dimm_get_free_addr(uint64_t address_space_start,
uint64_t address_space_size,
- uint64_t *hint, uint64_t size,
+ uint64_t *hint, uint64_t align, uint64_t size,
Error **errp)
{
GSList *list = NULL, *item;
@@ -152,6 +152,18 @@ uint64_t pc_dimm_get_free_addr(uint64_t
address_space_start,
goto out;
}
+ if (hint && QEMU_ALIGN_UP(*hint, align) != *hint) {
+ error_setg(errp, "address must be aligned to 0x%" PRIx64 " bytes",
+ align);
+ goto out;
+ }
+
+ if (QEMU_ALIGN_UP(size, align) != size) {
+ error_setg(errp, "backend memory size must be multiple of 0x%"
+ PRIx64, align);
+ goto out;
+ }
+
assert(address_space_end > address_space_start);
object_child_foreach(qdev_get_machine(), pc_dimm_built_list, &list);
--
MST
- [Qemu-devel] [PULL v2 00/15] pc, pci, misc bugfixes, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 01/15] qemu-char: fix tcp_get_fds, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 02/15] pc: kvm: check if KVM has free memory slots to avoid abort(), Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 03/15] pc: make pc_dimm_plug() more readble, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 04/15] pc: limit DIMM address and size to page aligned values,
Michael S. Tsirkin <=
- [Qemu-devel] [PULL v2 05/15] memory: expose alignment used for allocating RAM as MemoryRegion API, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 06/15] pc: align DIMM's address/size by backend's alignment value, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 09/15] pc: count in 1Gb hugepage alignment when sizing hotplug-memory container, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 11/15] acpi-build: mark RAM dirty on table update, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 07/15] pc: pc-dimm: use backend alignment during address auto allocation, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 12/15] target-i386: move generic memory hotplug methods to DSDTs, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 13/15] pcie: fix typo in pcie_cap_deverr_init(), Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 14/15] pcie: fix improper use of negative value, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 15/15] pc: acpi: mark all possible CPUs as enabled in SRAT, Michael S. Tsirkin, 2014/11/24
- [Qemu-devel] [PULL v2 08/15] pc: explicitly check maxmem limit when adding DIMM, Michael S. Tsirkin, 2014/11/24