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dm: fix SSRAM region unmap failure issue

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In ACRN HSM driver, only MMIO type is supported
 when doing EPT unmap.

 This patch walk around above issue to unmap
 SSRAM region before doing EPT mapping.

Tracked-On: #7563
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2022-05-07 11:21:19 +03:00 committed by acrnsi-robot
parent c084a24ea2
commit 541f3916c8
1 changed files with 9 additions and 1 deletions
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10
devicemodel/hw/platform/vssram/vssram.c
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@ -449,7 +449,6 @@ static void *vssram_mmap_buffer(int fd, size_t size)
static int vssram_ept_map_buffer(struct vmctx *ctx, struct vssram_buf *buf_desc)
{
struct acrn_vm_memmap memmap = {
.type = ACRN_MEMMAP_RAM,
.vma_base = 0,
.len = 0,
.attr = ACRN_MEM_ACCESS_RWX
@ -458,10 +457,19 @@ static int vssram_ept_map_buffer(struct vmctx *ctx, struct vssram_buf *buf_desc)
memmap.vma_base = buf_desc->vma_base;
memmap.user_vm_pa = buf_desc->gpa_base;
memmap.len = buf_desc->size;
/*
* This is a Walk-around:
* - As only MMIO type can be supported when doing EPT unmap in HSM driver,
* so hardcoding of 'type' to be MMIO type.
*/
memmap.type = ACRN_MEMMAP_MMIO;
error = ioctl(ctx->fd, ACRN_IOCTL_UNSET_MEMSEG, &memmap);
if (error) {
pr_err("ACRN_IOCTL_UNSET_MEMSEG ioctl() returned an error: %s\n", errormsg(errno));
}
memmap.type = ACRN_MEMMAP_RAM;
error = ioctl(ctx->fd, ACRN_IOCTL_SET_MEMSEG, &memmap);
if (error) {
pr_err("ACRN_IOCTL_SET_MEMSEG ioctl() returned an error: %s\n", errormsg(errno));