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s390/protvirt: parse prot_virt option in the decompressor

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To make early kernel address space layout definition possible parse
prot_virt option in the decompressor and pass it to the uncompressed
kernel. This enables kasan to take ultravisor secure storage limit into
consideration and pre-define vmalloc position correctly.

Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Vasily Gorbik
2020-09-11 11:38:21 +02:00
parent 8f78657c29
commit 1d6671ae46
4 changed files with 28 additions and 26 deletions
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8
arch/s390/boot/ipl_parm.c
View File

@@ -254,6 +254,14 @@ void parse_boot_command_line(void)
if (!strcmp(param, "nokaslr"))
kaslr_enabled = 0;
#if IS_ENABLED(CONFIG_KVM)
if (!strcmp(param, "prot_virt")) {
rc = kstrtobool(val, &enabled);
if (!rc && enabled)
prot_virt_host = 1;
}
#endif
}
}

3
arch/s390/boot/uv.c
View File

@@ -7,6 +7,9 @@
#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
int __bootdata_preserved(prot_virt_guest);
#endif
#if IS_ENABLED(CONFIG_KVM)
int __bootdata_preserved(prot_virt_host);
#endif
struct uv_info __bootdata_preserved(uv_info);
void uv_query_info(void)

3
arch/s390/kernel/setup.c
View File

@@ -1137,8 +1137,7 @@ void __init setup_arch(char **cmdline_p)
free_mem_detect_info();
remove_oldmem();
if (is_prot_virt_host())
setup_uv();
setup_uv();
setup_memory_end();
setup_memory();
dma_contiguous_reserve(memory_end);

40
arch/s390/kernel/uv.c
View File

@@ -26,33 +26,10 @@ int __bootdata_preserved(prot_virt_guest);
struct uv_info __bootdata_preserved(uv_info);
#if IS_ENABLED(CONFIG_KVM)
int prot_virt_host;
int __bootdata_preserved(prot_virt_host);
EXPORT_SYMBOL(prot_virt_host);
EXPORT_SYMBOL(uv_info);
static int __init prot_virt_setup(char *val)
{
bool enabled;
int rc;
rc = kstrtobool(val, &enabled);
if (!rc && enabled)
prot_virt_host = 1;
if (is_prot_virt_guest() && prot_virt_host) {
prot_virt_host = 0;
pr_warn("Protected virtualization not available in protected guests.");
}
if (prot_virt_host && !test_facility(158)) {
prot_virt_host = 0;
pr_warn("Protected virtualization not supported by the hardware.");
}
return rc;
}
early_param("prot_virt", prot_virt_setup);
static int __init uv_init(unsigned long stor_base, unsigned long stor_len)
{
struct uv_cb_init uvcb = {
@@ -74,6 +51,21 @@ void __init setup_uv(void)
{
unsigned long uv_stor_base;
if (!is_prot_virt_host())
return;
if (is_prot_virt_guest()) {
prot_virt_host = 0;
pr_warn("Protected virtualization not available in protected guests.");
return;
}
if (!test_facility(158)) {
prot_virt_host = 0;
pr_warn("Protected virtualization not supported by the hardware.");
return;
}
uv_stor_base = (unsigned long)memblock_alloc_try_nid(
uv_info.uv_base_stor_len, SZ_1M, SZ_2G,
MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE);