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| author | Michael Kelley <mikelley@microsoft.com> | 2023-03-08 18:40:06 -0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-03-27 09:24:01 +0200 |
| commit | e45e761b77bc0739e7e23258c4394013bbb919c7 (patch) | |
| tree | 8e88128fefa0a8ffa27c89c32ad11be02cb027b3 /init | |
| parent | c7b5254bd802ee3868f1c59333545272dc700d6d (diff) | |
| download | lwn-e45e761b77bc0739e7e23258c4394013bbb919c7.tar.gz lwn-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.c | 19 |
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 |