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[tip:,x86/sev] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently

Message ID 167994779300.5837.15408896550338511854.tip-bot2@tip-bot2
State New
Headers
Series [tip:,x86/sev] x86/mm: Handle decryption/re-encryption of bss_decrypted consistently |

Commit Message

tip-bot2 for Thomas Gleixner March 27, 2023, 8:09 p.m. UTC 
  The following commit has been merged into the x86/sev branch of tip:

Commit-ID:     c7b5254bd802ee3868f1c59333545272dc700d6d
Gitweb:        https://git.kernel.org/tip/c7b5254bd802ee3868f1c59333545272dc700d6d
Author:        Michael Kelley <mikelley@microsoft.com>
AuthorDate:    Wed, 08 Mar 2023 18:40:05 -08:00
Committer:     Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Mon, 27 Mar 2023 09:23:21 +02:00

x86/mm: Handle decryption/re-encryption of bss_decrypted consistently

sme_postprocess_startup() decrypts the bss_decrypted section when
sme_me_mask is non-zero.

mem_encrypt_free_decrypted_mem() re-encrypts the unused portion based
on CC_ATTR_MEM_ENCRYPT.

In a Hyper-V guest VM using vTOM, these conditions are not equivalent
as sme_me_mask is always zero when using vTOM. Consequently,
mem_encrypt_free_decrypted_mem() attempts to re-encrypt memory that was
never decrypted.

So check sme_me_mask in mem_encrypt_free_decrypted_mem() too.

Hyper-V guests using vTOM don't need the bss_decrypted section to be
decrypted, so skipping the decryption/re-encryption doesn't cause a
problem.

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/1678329614-3482-5-git-send-email-mikelley@microsoft.com
---
 arch/x86/mm/mem_encrypt_amd.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/mm/mem_encrypt_amd.c b/arch/x86/mm/mem_encrypt_amd.c
index 9c4d8db..e0b51c0 100644
--- a/arch/x86/mm/mem_encrypt_amd.c
+++ b/arch/x86/mm/mem_encrypt_amd.c
@@ -513,10 +513,14 @@  void __init mem_encrypt_free_decrypted_mem(void)
 	npages = (vaddr_end - vaddr) >> PAGE_SHIFT;
 
 	/*
-	 * The unused memory range was mapped decrypted, change the encryption
-	 * attribute from decrypted to encrypted before freeing it.
+	 * If the unused memory range was mapped decrypted, change the encryption
+	 * attribute from decrypted to encrypted before freeing it. Base the
+	 * re-encryption on the same condition used for the decryption in
+	 * sme_postprocess_startup(). Higher level abstractions, such as
+	 * CC_ATTR_MEM_ENCRYPT, aren't necessarily equivalent in a Hyper-V VM
+	 * using vTOM, where sme_me_mask is always zero.
 	 */
-	if (cc_platform_has(CC_ATTR_MEM_ENCRYPT)) {
+	if (sme_me_mask) {
 		r = set_memory_encrypted(vaddr, npages);
 		if (r) {
 			pr_warn("failed to free unused decrypted pages\n");