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[Qemu-devel] [PATCH v2] vfio: convert to 128 bit arithmetic calculations
From: |
Bandan Das |
Subject: |
[Qemu-devel] [PATCH v2] vfio: convert to 128 bit arithmetic calculations when adding mem regions |
Date: |
Wed, 23 Mar 2016 20:37:25 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
vfio_listener_region_add for a iommu mr results in
an overflow assert since iommu memory region is initialized
with UINT64_MAX. Convert calculations to 128 bit arithmetic
for iommu memory regions and let int128_get64 assert for non iommu
regions if there's an overflow.
Suggested-by: Alex Williamson <address@hidden>
Signed-off-by: Bandan Das <address@hidden>
---
v2:
Just reuse @end (as hwaddr) for the end address
Remove white space changes
Extend 128 bit arithmetic ops upto the point vfio_dma_map is called
Minor changes to commit message
v1:
This is v2 of http://patchwork.ozlabs.org/patch/600364/
hw/vfio/common.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index fb588d8..ca05c87 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -323,7 +323,7 @@ static void vfio_listener_region_add(MemoryListener
*listener,
{
VFIOContainer *container = container_of(listener, VFIOContainer, listener);
hwaddr iova, end;
- Int128 llend;
+ Int128 llend, llsize;
void *vaddr;
int ret;
@@ -349,12 +349,12 @@ static void vfio_listener_region_add(MemoryListener
*listener,
if (int128_ge(int128_make64(iova), llend)) {
return;
}
- end = int128_get64(llend);
+ end = int128_get64(int128_sub(llend, int128_one()));
- if ((iova < container->min_iova) || ((end - 1) > container->max_iova)) {
+ if ((iova < container->min_iova) || (end > container->max_iova)) {
error_report("vfio: IOMMU container %p can't map guest IOVA region"
" 0x%"HWADDR_PRIx"..0x%"HWADDR_PRIx,
- container, iova, end - 1);
+ container, iova, end);
ret = -EFAULT;
goto fail;
}
@@ -364,7 +364,7 @@ static void vfio_listener_region_add(MemoryListener
*listener,
if (memory_region_is_iommu(section->mr)) {
VFIOGuestIOMMU *giommu;
- trace_vfio_listener_region_add_iommu(iova, end - 1);
+ trace_vfio_listener_region_add_iommu(iova, end);
/*
* FIXME: We should do some checking to see if the
* capabilities of the host VFIO IOMMU are adequate to model
@@ -389,6 +389,8 @@ static void vfio_listener_region_add(MemoryListener
*listener,
return;
}
+ llsize = int128_sub(llend, int128_make64(iova));
+
/* Here we assume that memory_region_is_ram(section->mr)==true */
vaddr = memory_region_get_ram_ptr(section->mr) +
@@ -397,11 +399,12 @@ static void vfio_listener_region_add(MemoryListener
*listener,
trace_vfio_listener_region_add_ram(iova, end - 1, vaddr);
- ret = vfio_dma_map(container, iova, end - iova, vaddr, section->readonly);
+ ret = vfio_dma_map(container, iova, int128_get64(llsize),
+ vaddr, section->readonly);
if (ret) {
error_report("vfio_dma_map(%p, 0x%"HWADDR_PRIx", "
"0x%"HWADDR_PRIx", %p) = %d (%m)",
- container, iova, end - iova, vaddr, ret);
+ container, iova, int128_get64(llsize), vaddr, ret);
goto fail;
}
--
2.5.0
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