119 lines
2.6 KiB
C
119 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Secure VM platform
|
|
*
|
|
* Copyright 2018 IBM Corporation
|
|
* Author: Anshuman Khandual <khandual@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/memblock.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/svm.h>
|
|
#include <asm/swiotlb.h>
|
|
#include <asm/ultravisor.h>
|
|
#include <asm/dtl.h>
|
|
|
|
static int __init init_svm(void)
|
|
{
|
|
if (!is_secure_guest())
|
|
return 0;
|
|
|
|
/* Don't release the SWIOTLB buffer. */
|
|
ppc_swiotlb_enable = 1;
|
|
|
|
/*
|
|
* Since the guest memory is inaccessible to the host, devices always
|
|
* need to use the SWIOTLB buffer for DMA even if dma_capable() says
|
|
* otherwise.
|
|
*/
|
|
swiotlb_force = SWIOTLB_FORCE;
|
|
|
|
/* Share the SWIOTLB buffer with the host. */
|
|
swiotlb_update_mem_attributes();
|
|
|
|
return 0;
|
|
}
|
|
machine_early_initcall(pseries, init_svm);
|
|
|
|
/*
|
|
* Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it
|
|
* can allocate the buffer anywhere in memory. Since the hypervisor doesn't have
|
|
* any addressing limitation, we don't need to allocate it in low addresses.
|
|
*/
|
|
void __init svm_swiotlb_init(void)
|
|
{
|
|
unsigned char *vstart;
|
|
unsigned long bytes, io_tlb_nslabs;
|
|
|
|
io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT);
|
|
io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE);
|
|
|
|
bytes = io_tlb_nslabs << IO_TLB_SHIFT;
|
|
|
|
vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE);
|
|
if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false))
|
|
return;
|
|
|
|
|
|
memblock_free_early(__pa(vstart),
|
|
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
|
|
panic("SVM: Cannot allocate SWIOTLB buffer");
|
|
}
|
|
|
|
int set_memory_encrypted(unsigned long addr, int numpages)
|
|
{
|
|
if (!mem_encrypt_active())
|
|
return 0;
|
|
|
|
if (!PAGE_ALIGNED(addr))
|
|
return -EINVAL;
|
|
|
|
uv_unshare_page(PHYS_PFN(__pa(addr)), numpages);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int set_memory_decrypted(unsigned long addr, int numpages)
|
|
{
|
|
if (!mem_encrypt_active())
|
|
return 0;
|
|
|
|
if (!PAGE_ALIGNED(addr))
|
|
return -EINVAL;
|
|
|
|
uv_share_page(PHYS_PFN(__pa(addr)), numpages);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* There's one dispatch log per CPU. */
|
|
#define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE)
|
|
|
|
static struct page *dtl_page_store[NR_DTL_PAGE];
|
|
static long dtl_nr_pages;
|
|
|
|
static bool is_dtl_page_shared(struct page *page)
|
|
{
|
|
long i;
|
|
|
|
for (i = 0; i < dtl_nr_pages; i++)
|
|
if (dtl_page_store[i] == page)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
void dtl_cache_ctor(void *addr)
|
|
{
|
|
unsigned long pfn = PHYS_PFN(__pa(addr));
|
|
struct page *page = pfn_to_page(pfn);
|
|
|
|
if (!is_dtl_page_shared(page)) {
|
|
dtl_page_store[dtl_nr_pages] = page;
|
|
dtl_nr_pages++;
|
|
WARN_ON(dtl_nr_pages >= NR_DTL_PAGE);
|
|
uv_share_page(pfn, 1);
|
|
}
|
|
}
|