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qemu-usb: use bounce buffer to access DMA memory

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The former implemention assumed that the guest physical memory is
mapped continously. This, however, is not true. Writing larger
files to an USB stick with a Windows 10 guest would therefore lead
to data corruption.

The current implementation uses a bounce buffer to copy the data
to and from the guest physical memory and leaves dealing with the
memory mappings entirely up to the VMM.

Fixes #4017.
This commit is contained in:
Josef Söntgen
2021-02-12 12:55:44 +01:00
committed by Norman Feske
parent 23620942bf
commit b51ae104c2
3 changed files with 74 additions and 13 deletions
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6
repos/libports/include/qemu/usb.h
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@ -57,6 +57,8 @@ namespace Qemu {
*/
struct Pci_device
{
enum class Dma_direction { IN = 0, OUT = 1, };
/**
* Raise interrupt
*
@ -65,8 +67,8 @@ namespace Qemu {
virtual void raise_interrupt(int assert) = 0;
virtual int read_dma(addr_t addr, void *buf, size_t size) = 0;
virtual int write_dma(addr_t addr, void const *buf, size_t size) = 0;
virtual void *map_dma(addr_t base, size_t size) = 0;
virtual void unmap_dma(void *addr, size_t size) = 0;
virtual void *map_dma(addr_t base, size_t size, Dma_direction dir) = 0;
virtual void unmap_dma(void *addr, size_t size, Dma_direction dir) = 0;
};