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authorMichael Kelley <mikelley@microsoft.com>2023-03-09 03:40:06 +0100
committerBorislav Petkov (AMD) <bp@alien8.de>2023-03-27 09:24:01 +0200
commite45e761b77bc0739e7e23258c4394013bbb919c7 (patch)
tree8e88128fefa0a8ffa27c89c32ad11be02cb027b3 /init
parentx86/mm: Handle decryption/re-encryption of bss_decrypted consistently (diff)
downloadlinux-e45e761b77bc0739e7e23258c4394013bbb919c7.tar.xz
linux-e45e761b77bc0739e7e23258c4394013bbb919c7.zip
init: Call mem_encrypt_init() after Hyper-V hypercall init is done
Full Hyper-V initialization, including support for hypercalls, is done as an apic_post_init callback via late_time_init(). mem_encrypt_init() needs to make hypercalls when it marks swiotlb memory as decrypted. But mem_encrypt_init() is currently called a few lines before late_time_init(), so the hypercalls don't work. Fix this by moving mem_encrypt_init() after late_time_init() and related clock initializations. The intervening initializations don't do any I/O that requires the swiotlb, so moving mem_encrypt_init() slightly later has no impact. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Link: https://lore.kernel.org/r/1678329614-3482-6-git-send-email-mikelley@microsoft.com
Diffstat (limited to 'init')
-rw-r--r--init/main.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/init/main.c b/init/main.c
index 4425d1783d5c..7e9c0ca25643 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1088,14 +1088,6 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
*/
locking_selftest();
- /*
- * This needs to be called before any devices perform DMA
- * operations that might use the SWIOTLB bounce buffers. It will
- * mark the bounce buffers as decrypted so that their usage will
- * not cause "plain-text" data to be decrypted when accessed.
- */
- mem_encrypt_init();
-
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && !initrd_below_start_ok &&
page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
@@ -1112,6 +1104,17 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
late_time_init();
sched_clock_init();
calibrate_delay();
+
+ /*
+ * This needs to be called before any devices perform DMA
+ * operations that might use the SWIOTLB bounce buffers. It will
+ * mark the bounce buffers as decrypted so that their usage will
+ * not cause "plain-text" data to be decrypted when accessed. It
+ * must be called after late_time_init() so that Hyper-V x86/x64
+ * hypercalls work when the SWIOTLB bounce buffers are decrypted.
+ */
+ mem_encrypt_init();
+
pid_idr_init();
anon_vma_init();
#ifdef CONFIG_X86