blob: 402dc4234e397861daef0be131a61118c8f2681a [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Kernel-based Virtual Machine driver for Linux
*
* AMD SVM-SEV support
*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*/
#include <linux/kvm_types.h>
#include <linux/kvm_host.h>
#include <linux/kernel.h>
#include <linux/highmem.h>
#include <linux/psp-sev.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include "x86.h"
#include "svm.h"
static int sev_flush_asids(void);
static DECLARE_RWSEM(sev_deactivate_lock);
static DEFINE_MUTEX(sev_bitmap_lock);
unsigned int max_sev_asid;
static unsigned int min_sev_asid;
static unsigned long *sev_asid_bitmap;
static unsigned long *sev_reclaim_asid_bitmap;
#define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
struct enc_region {
struct list_head list;
unsigned long npages;
struct page **pages;
unsigned long uaddr;
unsigned long size;
};
static int sev_flush_asids(void)
{
int ret, error = 0;
/*
* DEACTIVATE will clear the WBINVD indicator causing DF_FLUSH to fail,
* so it must be guarded.
*/
down_write(&sev_deactivate_lock);
wbinvd_on_all_cpus();
ret = sev_guest_df_flush(&error);
up_write(&sev_deactivate_lock);
if (ret)
pr_err("SEV: DF_FLUSH failed, ret=%d, error=%#x\n", ret, error);
return ret;
}
/* Must be called with the sev_bitmap_lock held */
static bool __sev_recycle_asids(void)
{
int pos;
/* Check if there are any ASIDs to reclaim before performing a flush */
pos = find_next_bit(sev_reclaim_asid_bitmap,
max_sev_asid, min_sev_asid - 1);
if (pos >= max_sev_asid)
return false;
if (sev_flush_asids())
return false;
bitmap_xor(sev_asid_bitmap, sev_asid_bitmap, sev_reclaim_asid_bitmap,
max_sev_asid);
bitmap_zero(sev_reclaim_asid_bitmap, max_sev_asid);
return true;
}
static int sev_asid_new(void)
{
bool retry = true;
int pos;
mutex_lock(&sev_bitmap_lock);
/*
* SEV-enabled guest must use asid from min_sev_asid to max_sev_asid.
*/
again:
pos = find_next_zero_bit(sev_asid_bitmap, max_sev_asid, min_sev_asid - 1);
if (pos >= max_sev_asid) {
if (retry && __sev_recycle_asids()) {
retry = false;
goto again;
}
mutex_unlock(&sev_bitmap_lock);
return -EBUSY;
}
__set_bit(pos, sev_asid_bitmap);
mutex_unlock(&sev_bitmap_lock);
return pos + 1;
}
static int sev_get_asid(struct kvm *kvm)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
return sev->asid;
}
static void sev_asid_free(int asid)
{
struct svm_cpu_data *sd;
int cpu, pos;
mutex_lock(&sev_bitmap_lock);
pos = asid - 1;
__set_bit(pos, sev_reclaim_asid_bitmap);
for_each_possible_cpu(cpu) {
sd = per_cpu(svm_data, cpu);
sd->sev_vmcbs[pos] = NULL;
}
mutex_unlock(&sev_bitmap_lock);
}
static void sev_unbind_asid(struct kvm *kvm, unsigned int handle)
{
struct sev_data_decommission *decommission;
struct sev_data_deactivate *data;
if (!handle)
return;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
return;
/* deactivate handle */
data->handle = handle;
/* Guard DEACTIVATE against WBINVD/DF_FLUSH used in ASID recycling */
down_read(&sev_deactivate_lock);
sev_guest_deactivate(data, NULL);
up_read(&sev_deactivate_lock);
kfree(data);
decommission = kzalloc(sizeof(*decommission), GFP_KERNEL);
if (!decommission)
return;
/* decommission handle */
decommission->handle = handle;
sev_guest_decommission(decommission, NULL);
kfree(decommission);
}
static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
int asid, ret;
ret = -EBUSY;
if (unlikely(sev->active))
return ret;
asid = sev_asid_new();
if (asid < 0)
return ret;
ret = sev_platform_init(&argp->error);
if (ret)
goto e_free;
sev->active = true;
sev->asid = asid;
INIT_LIST_HEAD(&sev->regions_list);
return 0;
e_free:
sev_asid_free(asid);
return ret;
}
static int sev_bind_asid(struct kvm *kvm, unsigned int handle, int *error)
{
struct sev_data_activate *data;
int asid = sev_get_asid(kvm);
int ret;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
/* activate ASID on the given handle */
data->handle = handle;
data->asid = asid;
ret = sev_guest_activate(data, error);
kfree(data);
return ret;
}
static int __sev_issue_cmd(int fd, int id, void *data, int *error)
{
struct fd f;
int ret;
f = fdget(fd);
if (!f.file)
return -EBADF;
ret = sev_issue_cmd_external_user(f.file, id, data, error);
fdput(f);
return ret;
}
static int sev_issue_cmd(struct kvm *kvm, int id, void *data, int *error)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
return __sev_issue_cmd(sev->fd, id, data, error);
}
static int sev_launch_start(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_launch_start *start;
struct kvm_sev_launch_start params;
void *dh_blob, *session_blob;
int *error = &argp->error;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
start = kzalloc(sizeof(*start), GFP_KERNEL_ACCOUNT);
if (!start)
return -ENOMEM;
dh_blob = NULL;
if (params.dh_uaddr) {
dh_blob = psp_copy_user_blob(params.dh_uaddr, params.dh_len);
if (IS_ERR(dh_blob)) {
ret = PTR_ERR(dh_blob);
goto e_free;
}
start->dh_cert_address = __sme_set(__pa(dh_blob));
start->dh_cert_len = params.dh_len;
}
session_blob = NULL;
if (params.session_uaddr) {
session_blob = psp_copy_user_blob(params.session_uaddr, params.session_len);
if (IS_ERR(session_blob)) {
ret = PTR_ERR(session_blob);
goto e_free_dh;
}
start->session_address = __sme_set(__pa(session_blob));
start->session_len = params.session_len;
}
start->handle = params.handle;
start->policy = params.policy;
/* create memory encryption context */
ret = __sev_issue_cmd(argp->sev_fd, SEV_CMD_LAUNCH_START, start, error);
if (ret)
goto e_free_session;
/* Bind ASID to this guest */
ret = sev_bind_asid(kvm, start->handle, error);
if (ret)
goto e_free_session;
/* return handle to userspace */
params.handle = start->handle;
if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params))) {
sev_unbind_asid(kvm, start->handle);
ret = -EFAULT;
goto e_free_session;
}
sev->handle = start->handle;
sev->fd = argp->sev_fd;
e_free_session:
kfree(session_blob);
e_free_dh:
kfree(dh_blob);
e_free:
kfree(start);
return ret;
}
static struct page **sev_pin_memory(struct kvm *kvm, unsigned long uaddr,
unsigned long ulen, unsigned long *n,
int write)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
unsigned long npages, size;
int npinned;
unsigned long locked, lock_limit;
struct page **pages;
unsigned long first, last;
int ret;
if (ulen == 0 || uaddr + ulen < uaddr)
return ERR_PTR(-EINVAL);
/* Calculate number of pages. */
first = (uaddr & PAGE_MASK) >> PAGE_SHIFT;
last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT;
npages = (last - first + 1);
locked = sev->pages_locked + npages;
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
pr_err("SEV: %lu locked pages exceed the lock limit of %lu.\n", locked, lock_limit);
return ERR_PTR(-ENOMEM);
}
if (WARN_ON_ONCE(npages > INT_MAX))
return ERR_PTR(-EINVAL);
/* Avoid using vmalloc for smaller buffers. */
size = npages * sizeof(struct page *);
if (size > PAGE_SIZE)
pages = __vmalloc(size, GFP_KERNEL_ACCOUNT | __GFP_ZERO);
else
pages = kmalloc(size, GFP_KERNEL_ACCOUNT);
if (!pages)
return ERR_PTR(-ENOMEM);
/* Pin the user virtual address. */
npinned = pin_user_pages_fast(uaddr, npages, write ? FOLL_WRITE : 0, pages);
if (npinned != npages) {
pr_err("SEV: Failure locking %lu pages.\n", npages);
ret = -ENOMEM;
goto err;
}
*n = npages;
sev->pages_locked = locked;
return pages;
err:
if (npinned > 0)
unpin_user_pages(pages, npinned);
kvfree(pages);
return ERR_PTR(ret);
}
static void sev_unpin_memory(struct kvm *kvm, struct page **pages,
unsigned long npages)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
unpin_user_pages(pages, npages);
kvfree(pages);
sev->pages_locked -= npages;
}
static void sev_clflush_pages(struct page *pages[], unsigned long npages)
{
uint8_t *page_virtual;
unsigned long i;
if (npages == 0 || pages == NULL)
return;
for (i = 0; i < npages; i++) {
page_virtual = kmap_atomic(pages[i]);
clflush_cache_range(page_virtual, PAGE_SIZE);
kunmap_atomic(page_virtual);
}
}
static unsigned long get_num_contig_pages(unsigned long idx,
struct page **inpages, unsigned long npages)
{
unsigned long paddr, next_paddr;
unsigned long i = idx + 1, pages = 1;
/* find the number of contiguous pages starting from idx */
paddr = __sme_page_pa(inpages[idx]);
while (i < npages) {
next_paddr = __sme_page_pa(inpages[i++]);
if ((paddr + PAGE_SIZE) == next_paddr) {
pages++;
paddr = next_paddr;
continue;
}
break;
}
return pages;
}
static int sev_launch_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
unsigned long vaddr, vaddr_end, next_vaddr, npages, pages, size, i;
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct kvm_sev_launch_update_data params;
struct sev_data_launch_update_data *data;
struct page **inpages;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
vaddr = params.uaddr;
size = params.len;
vaddr_end = vaddr + size;
/* Lock the user memory. */
inpages = sev_pin_memory(kvm, vaddr, size, &npages, 1);
if (IS_ERR(inpages)) {
ret = PTR_ERR(inpages);
goto e_free;
}
/*
* The LAUNCH_UPDATE command will perform in-place encryption of the
* memory content (i.e it will write the same memory region with C=1).
* It's possible that the cache may contain the data with C=0, i.e.,
* unencrypted so invalidate it first.
*/
sev_clflush_pages(inpages, npages);
for (i = 0; vaddr < vaddr_end; vaddr = next_vaddr, i += pages) {
int offset, len;
/*
* If the user buffer is not page-aligned, calculate the offset
* within the page.
*/
offset = vaddr & (PAGE_SIZE - 1);
/* Calculate the number of pages that can be encrypted in one go. */
pages = get_num_contig_pages(i, inpages, npages);
len = min_t(size_t, ((pages * PAGE_SIZE) - offset), size);
data->handle = sev->handle;
data->len = len;
data->address = __sme_page_pa(inpages[i]) + offset;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_DATA, data, &argp->error);
if (ret)
goto e_unpin;
size -= len;
next_vaddr = vaddr + len;
}
e_unpin:
/* content of memory is updated, mark pages dirty */
for (i = 0; i < npages; i++) {
set_page_dirty_lock(inpages[i]);
mark_page_accessed(inpages[i]);
}
/* unlock the user pages */
sev_unpin_memory(kvm, inpages, npages);
e_free:
kfree(data);
return ret;
}
static int sev_launch_measure(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
void __user *measure = (void __user *)(uintptr_t)argp->data;
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_launch_measure *data;
struct kvm_sev_launch_measure params;
void __user *p = NULL;
void *blob = NULL;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, measure, sizeof(params)))
return -EFAULT;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
/* User wants to query the blob length */
if (!params.len)
goto cmd;
p = (void __user *)(uintptr_t)params.uaddr;
if (p) {
if (params.len > SEV_FW_BLOB_MAX_SIZE) {
ret = -EINVAL;
goto e_free;
}
ret = -ENOMEM;
blob = kmalloc(params.len, GFP_KERNEL);
if (!blob)
goto e_free;
data->address = __psp_pa(blob);
data->len = params.len;
}
cmd:
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_MEASURE, data, &argp->error);
/*
* If we query the session length, FW responded with expected data.
*/
if (!params.len)
goto done;
if (ret)
goto e_free_blob;
if (blob) {
if (copy_to_user(p, blob, params.len))
ret = -EFAULT;
}
done:
params.len = data->len;
if (copy_to_user(measure, &params, sizeof(params)))
ret = -EFAULT;
e_free_blob:
kfree(blob);
e_free:
kfree(data);
return ret;
}
static int sev_launch_finish(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_launch_finish *data;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_FINISH, data, &argp->error);
kfree(data);
return ret;
}
static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct kvm_sev_guest_status params;
struct sev_data_guest_status *data;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_GUEST_STATUS, data, &argp->error);
if (ret)
goto e_free;
params.policy = data->policy;
params.state = data->state;
params.handle = data->handle;
if (copy_to_user((void __user *)(uintptr_t)argp->data, &params, sizeof(params)))
ret = -EFAULT;
e_free:
kfree(data);
return ret;
}
static int __sev_issue_dbg_cmd(struct kvm *kvm, unsigned long src,
unsigned long dst, int size,
int *error, bool enc)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_dbg *data;
int ret;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
return -ENOMEM;
data->handle = sev->handle;
data->dst_addr = dst;
data->src_addr = src;
data->len = size;
ret = sev_issue_cmd(kvm,
enc ? SEV_CMD_DBG_ENCRYPT : SEV_CMD_DBG_DECRYPT,
data, error);
kfree(data);
return ret;
}
static int __sev_dbg_decrypt(struct kvm *kvm, unsigned long src_paddr,
unsigned long dst_paddr, int sz, int *err)
{
int offset;
/*
* Its safe to read more than we are asked, caller should ensure that
* destination has enough space.
*/
src_paddr = round_down(src_paddr, 16);
offset = src_paddr & 15;
sz = round_up(sz + offset, 16);
return __sev_issue_dbg_cmd(kvm, src_paddr, dst_paddr, sz, err, false);
}
static int __sev_dbg_decrypt_user(struct kvm *kvm, unsigned long paddr,
unsigned long __user dst_uaddr,
unsigned long dst_paddr,
int size, int *err)
{
struct page *tpage = NULL;
int ret, offset;
/* if inputs are not 16-byte then use intermediate buffer */
if (!IS_ALIGNED(dst_paddr, 16) ||
!IS_ALIGNED(paddr, 16) ||
!IS_ALIGNED(size, 16)) {
tpage = (void *)alloc_page(GFP_KERNEL);
if (!tpage)
return -ENOMEM;
dst_paddr = __sme_page_pa(tpage);
}
ret = __sev_dbg_decrypt(kvm, paddr, dst_paddr, size, err);
if (ret)
goto e_free;
if (tpage) {
offset = paddr & 15;
if (copy_to_user((void __user *)(uintptr_t)dst_uaddr,
page_address(tpage) + offset, size))
ret = -EFAULT;
}
e_free:
if (tpage)
__free_page(tpage);
return ret;
}
static int __sev_dbg_encrypt_user(struct kvm *kvm, unsigned long paddr,
unsigned long __user vaddr,
unsigned long dst_paddr,
unsigned long __user dst_vaddr,
int size, int *error)
{
struct page *src_tpage = NULL;
struct page *dst_tpage = NULL;
int ret, len = size;
/* If source buffer is not aligned then use an intermediate buffer */
if (!IS_ALIGNED(vaddr, 16)) {
src_tpage = alloc_page(GFP_KERNEL);
if (!src_tpage)
return -ENOMEM;
if (copy_from_user(page_address(src_tpage),
(void __user *)(uintptr_t)vaddr, size)) {
__free_page(src_tpage);
return -EFAULT;
}
paddr = __sme_page_pa(src_tpage);
}
/*
* If destination buffer or length is not aligned then do read-modify-write:
* - decrypt destination in an intermediate buffer
* - copy the source buffer in an intermediate buffer
* - use the intermediate buffer as source buffer
*/
if (!IS_ALIGNED(dst_vaddr, 16) || !IS_ALIGNED(size, 16)) {
int dst_offset;
dst_tpage = alloc_page(GFP_KERNEL);
if (!dst_tpage) {
ret = -ENOMEM;
goto e_free;
}
ret = __sev_dbg_decrypt(kvm, dst_paddr,
__sme_page_pa(dst_tpage), size, error);
if (ret)
goto e_free;
/*
* If source is kernel buffer then use memcpy() otherwise
* copy_from_user().
*/
dst_offset = dst_paddr & 15;
if (src_tpage)
memcpy(page_address(dst_tpage) + dst_offset,
page_address(src_tpage), size);
else {
if (copy_from_user(page_address(dst_tpage) + dst_offset,
(void __user *)(uintptr_t)vaddr, size)) {
ret = -EFAULT;
goto e_free;
}
}
paddr = __sme_page_pa(dst_tpage);
dst_paddr = round_down(dst_paddr, 16);
len = round_up(size, 16);
}
ret = __sev_issue_dbg_cmd(kvm, paddr, dst_paddr, len, error, true);
e_free:
if (src_tpage)
__free_page(src_tpage);
if (dst_tpage)
__free_page(dst_tpage);
return ret;
}
static int sev_dbg_crypt(struct kvm *kvm, struct kvm_sev_cmd *argp, bool dec)
{
unsigned long vaddr, vaddr_end, next_vaddr;
unsigned long dst_vaddr;
struct page **src_p, **dst_p;
struct kvm_sev_dbg debug;
unsigned long n;
unsigned int size;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&debug, (void __user *)(uintptr_t)argp->data, sizeof(debug)))
return -EFAULT;
if (!debug.len || debug.src_uaddr + debug.len < debug.src_uaddr)
return -EINVAL;
if (!debug.dst_uaddr)
return -EINVAL;
vaddr = debug.src_uaddr;
size = debug.len;
vaddr_end = vaddr + size;
dst_vaddr = debug.dst_uaddr;
for (; vaddr < vaddr_end; vaddr = next_vaddr) {
int len, s_off, d_off;
/* lock userspace source and destination page */
src_p = sev_pin_memory(kvm, vaddr & PAGE_MASK, PAGE_SIZE, &n, 0);
if (IS_ERR(src_p))
return PTR_ERR(src_p);
dst_p = sev_pin_memory(kvm, dst_vaddr & PAGE_MASK, PAGE_SIZE, &n, 1);
if (IS_ERR(dst_p)) {
sev_unpin_memory(kvm, src_p, n);
return PTR_ERR(dst_p);
}
/*
* The DBG_{DE,EN}CRYPT commands will perform {dec,en}cryption of the
* memory content (i.e it will write the same memory region with C=1).
* It's possible that the cache may contain the data with C=0, i.e.,
* unencrypted so invalidate it first.
*/
sev_clflush_pages(src_p, 1);
sev_clflush_pages(dst_p, 1);
/*
* Since user buffer may not be page aligned, calculate the
* offset within the page.
*/
s_off = vaddr & ~PAGE_MASK;
d_off = dst_vaddr & ~PAGE_MASK;
len = min_t(size_t, (PAGE_SIZE - s_off), size);
if (dec)
ret = __sev_dbg_decrypt_user(kvm,
__sme_page_pa(src_p[0]) + s_off,
dst_vaddr,
__sme_page_pa(dst_p[0]) + d_off,
len, &argp->error);
else
ret = __sev_dbg_encrypt_user(kvm,
__sme_page_pa(src_p[0]) + s_off,
vaddr,
__sme_page_pa(dst_p[0]) + d_off,
dst_vaddr,
len, &argp->error);
sev_unpin_memory(kvm, src_p, n);
sev_unpin_memory(kvm, dst_p, n);
if (ret)
goto err;
next_vaddr = vaddr + len;
dst_vaddr = dst_vaddr + len;
size -= len;
}
err:
return ret;
}
static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct sev_data_launch_secret *data;
struct kvm_sev_launch_secret params;
struct page **pages;
void *blob, *hdr;
unsigned long n;
int ret, offset;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);
if (IS_ERR(pages))
return PTR_ERR(pages);
/*
* The secret must be copied into contiguous memory region, lets verify
* that userspace memory pages are contiguous before we issue command.
*/
if (get_num_contig_pages(0, pages, n) != n) {
ret = -EINVAL;
goto e_unpin_memory;
}
ret = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL_ACCOUNT);
if (!data)
goto e_unpin_memory;
offset = params.guest_uaddr & (PAGE_SIZE - 1);
data->guest_address = __sme_page_pa(pages[0]) + offset;
data->guest_len = params.guest_len;
blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
if (IS_ERR(blob)) {
ret = PTR_ERR(blob);
goto e_free;
}
data->trans_address = __psp_pa(blob);
data->trans_len = params.trans_len;
hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
if (IS_ERR(hdr)) {
ret = PTR_ERR(hdr);
goto e_free_blob;
}
data->hdr_address = __psp_pa(hdr);
data->hdr_len = params.hdr_len;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error);
kfree(hdr);
e_free_blob:
kfree(blob);
e_free:
kfree(data);
e_unpin_memory:
sev_unpin_memory(kvm, pages, n);
return ret;
}
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
int r;
if (!svm_sev_enabled())
return -ENOTTY;
if (!argp)
return 0;
if (copy_from_user(&sev_cmd, argp, sizeof(struct kvm_sev_cmd)))
return -EFAULT;
mutex_lock(&kvm->lock);
switch (sev_cmd.id) {
case KVM_SEV_INIT:
r = sev_guest_init(kvm, &sev_cmd);
break;
case KVM_SEV_LAUNCH_START:
r = sev_launch_start(kvm, &sev_cmd);
break;
case KVM_SEV_LAUNCH_UPDATE_DATA:
r = sev_launch_update_data(kvm, &sev_cmd);
break;
case KVM_SEV_LAUNCH_MEASURE:
r = sev_launch_measure(kvm, &sev_cmd);
break;
case KVM_SEV_LAUNCH_FINISH:
r = sev_launch_finish(kvm, &sev_cmd);
break;
case KVM_SEV_GUEST_STATUS:
r = sev_guest_status(kvm, &sev_cmd);
break;
case KVM_SEV_DBG_DECRYPT:
r = sev_dbg_crypt(kvm, &sev_cmd, true);
break;
case KVM_SEV_DBG_ENCRYPT:
r = sev_dbg_crypt(kvm, &sev_cmd, false);
break;
case KVM_SEV_LAUNCH_SECRET:
r = sev_launch_secret(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;
}
if (copy_to_user(argp, &sev_cmd, sizeof(struct kvm_sev_cmd)))
r = -EFAULT;
out:
mutex_unlock(&kvm->lock);
return r;
}
int svm_register_enc_region(struct kvm *kvm,
struct kvm_enc_region *range)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct enc_region *region;
int ret = 0;
if (!sev_guest(kvm))
return -ENOTTY;
if (range->addr > ULONG_MAX || range->size > ULONG_MAX)
return -EINVAL;
region = kzalloc(sizeof(*region), GFP_KERNEL_ACCOUNT);
if (!region)
return -ENOMEM;
region->pages = sev_pin_memory(kvm, range->addr, range->size, &region->npages, 1);
if (IS_ERR(region->pages)) {
ret = PTR_ERR(region->pages);
goto e_free;
}
/*
* The guest may change the memory encryption attribute from C=0 -> C=1
* or vice versa for this memory range. Lets make sure caches are
* flushed to ensure that guest data gets written into memory with
* correct C-bit.
*/
sev_clflush_pages(region->pages, region->npages);
region->uaddr = range->addr;
region->size = range->size;
mutex_lock(&kvm->lock);
list_add_tail(&region->list, &sev->regions_list);
mutex_unlock(&kvm->lock);
return ret;
e_free:
kfree(region);
return ret;
}
static struct enc_region *
find_enc_region(struct kvm *kvm, struct kvm_enc_region *range)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct list_head *head = &sev->regions_list;
struct enc_region *i;
list_for_each_entry(i, head, list) {
if (i->uaddr == range->addr &&
i->size == range->size)
return i;
}
return NULL;
}
static void __unregister_enc_region_locked(struct kvm *kvm,
struct enc_region *region)
{
sev_unpin_memory(kvm, region->pages, region->npages);
list_del(&region->list);
kfree(region);
}
int svm_unregister_enc_region(struct kvm *kvm,
struct kvm_enc_region *range)
{
struct enc_region *region;
int ret;
mutex_lock(&kvm->lock);
if (!sev_guest(kvm)) {
ret = -ENOTTY;
goto failed;
}
region = find_enc_region(kvm, range);
if (!region) {
ret = -EINVAL;
goto failed;
}
/*
* Ensure that all guest tagged cache entries are flushed before
* releasing the pages back to the system for use. CLFLUSH will
* not do this, so issue a WBINVD.
*/
wbinvd_on_all_cpus();
__unregister_enc_region_locked(kvm, region);
mutex_unlock(&kvm->lock);
return 0;
failed:
mutex_unlock(&kvm->lock);
return ret;
}
void sev_vm_destroy(struct kvm *kvm)
{
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
struct list_head *head = &sev->regions_list;
struct list_head *pos, *q;
if (!sev_guest(kvm))
return;
mutex_lock(&kvm->lock);
/*
* Ensure that all guest tagged cache entries are flushed before
* releasing the pages back to the system for use. CLFLUSH will
* not do this, so issue a WBINVD.
*/
wbinvd_on_all_cpus();
/*
* if userspace was terminated before unregistering the memory regions
* then lets unpin all the registered memory.
*/
if (!list_empty(head)) {
list_for_each_safe(pos, q, head) {
__unregister_enc_region_locked(kvm,
list_entry(pos, struct enc_region, list));
}
}
mutex_unlock(&kvm->lock);
sev_unbind_asid(kvm, sev->handle);
sev_asid_free(sev->asid);
}
int __init sev_hardware_setup(void)
{
struct sev_user_data_status *status;
int rc;
/* Maximum number of encrypted guests supported simultaneously */
max_sev_asid = cpuid_ecx(0x8000001F);
if (!svm_sev_enabled())
return 1;
/* Minimum ASID value that should be used for SEV guest */
min_sev_asid = cpuid_edx(0x8000001F);
/* Initialize SEV ASID bitmaps */
sev_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL);
if (!sev_asid_bitmap)
return 1;
sev_reclaim_asid_bitmap = bitmap_zalloc(max_sev_asid, GFP_KERNEL);
if (!sev_reclaim_asid_bitmap)
return 1;
status = kmalloc(sizeof(*status), GFP_KERNEL);
if (!status)
return 1;
/*
* Check SEV platform status.
*
* PLATFORM_STATUS can be called in any state, if we failed to query
* the PLATFORM status then either PSP firmware does not support SEV
* feature or SEV firmware is dead.
*/
rc = sev_platform_status(status, NULL);
if (rc)
goto err;
pr_info("SEV supported\n");
err:
kfree(status);
return rc;
}
void sev_hardware_teardown(void)
{
if (!svm_sev_enabled())
return;
bitmap_free(sev_asid_bitmap);
bitmap_free(sev_reclaim_asid_bitmap);
sev_flush_asids();
}
void pre_sev_run(struct vcpu_svm *svm, int cpu)
{
struct svm_cpu_data *sd = per_cpu(svm_data, cpu);
int asid = sev_get_asid(svm->vcpu.kvm);
/* Assign the asid allocated with this SEV guest */
svm->vmcb->control.asid = asid;
/*
* Flush guest TLB:
*
* 1) when different VMCB for the same ASID is to be run on the same host CPU.
* 2) or this VMCB was executed on different host CPU in previous VMRUNs.
*/
if (sd->sev_vmcbs[asid] == svm->vmcb &&
svm->vcpu.arch.last_vmentry_cpu == cpu)
return;
sd->sev_vmcbs[asid] = svm->vmcb;
svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ASID;
vmcb_mark_dirty(svm->vmcb, VMCB_ASID);
}