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coco: arm64: s390: powerpc: Mark secure guests with CC_ATTR_GUEST_MEM_ENCRYPT

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arm64 Realms, powerpc secure guests and s390 protected virtualization
guests currently report CC_ATTR_MEM_ENCRYPT, but not
CC_ATTR_GUEST_MEM_ENCRYPT.

These environments are all secure guest configurations. Their
force_dma_unencrypted() implementations also treat the same secure guest
state as requiring unencrypted DMA. Report CC_ATTR_GUEST_MEM_ENCRYPT for
the same condition so generic confidential-computing code can distinguish
guest memory encryption from host memory encryption instead of relying only
on CC_ATTR_MEM_ENCRYPT.

Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Link: https://lore.kernel.org/r/20260717180442.110954-9-aneesh.kumar@kernel.org
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Aneesh Kumar K.V (Arm) 2026-07-17 23:34:26 +05:30 committed by Marek Szyprowski
parent a7139dbbb1
commit d4b9d59318
3 changed files with 3 additions and 0 deletions
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1
arch/arm64/mm/init.c
View File

@ -418,6 +418,7 @@ bool cc_platform_has(enum cc_attr attr)
{
switch (attr) {
case CC_ATTR_MEM_ENCRYPT:
case CC_ATTR_GUEST_MEM_ENCRYPT:
return is_realm_world() || is_protected_kvm_guest();
default:
return false;

1
arch/powerpc/platforms/pseries/cc_platform.c
View File

@ -17,6 +17,7 @@ bool cc_platform_has(enum cc_attr attr)
{
switch (attr) {
case CC_ATTR_MEM_ENCRYPT:
case CC_ATTR_GUEST_MEM_ENCRYPT:
return is_secure_guest();
default:

1
arch/s390/mm/init.c
View File

@ -148,6 +148,7 @@ bool cc_platform_has(enum cc_attr attr)
{
switch (attr) {
case CC_ATTR_MEM_ENCRYPT:
case CC_ATTR_GUEST_MEM_ENCRYPT:
return is_prot_virt_guest();
default: