mirrors/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2025-11-02 17:49:03 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

x86/sev: Ensure SVSM reserved fields in a page validation entry are initialized to zero

Browse source 
In order to support future versions of the SVSM_CORE_PVALIDATE call, all
reserved fields within a PVALIDATE entry must be set to zero as an SVSM should
be ensuring all reserved fields are zero in order to support future usage of
reserved areas based on the protocol version.

Fixes: fcd042e864 ("x86/sev: Perform PVALIDATE using the SVSM when not at VMPL0")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: <stable@kernel.org>
Link: https://lore.kernel.org/7cde412f8b057ea13a646fb166b1ca023f6a5031.1755098819.git.thomas.lendacky@amd.com
This commit is contained in:
Tom Lendacky 2025-08-13 10:26:59 -05:00 committed by Borislav Petkov (AMD)
parent c08ba63078
commit 3ee9cebd0a
2 changed files with 3 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
arch/x86/boot/startup/sev-shared.c
View file

@ -785,6 +785,7 @@ static void __head svsm_pval_4k_page(unsigned long paddr, bool validate)
pc->entry[0].page_size = RMP_PG_SIZE_4K;
pc->entry[0].action = validate;
pc->entry[0].ignore_cf = 0;
pc->entry[0].rsvd = 0;
pc->entry[0].pfn = paddr >> PAGE_SHIFT;
/* Protocol 0, Call ID 1 */

2
arch/x86/coco/sev/core.c
View file

@ -227,6 +227,7 @@ static u64 svsm_build_ca_from_pfn_range(u64 pfn, u64 pfn_end, bool action,
pe->page_size = RMP_PG_SIZE_4K;
pe->action = action;
pe->ignore_cf = 0;
pe->rsvd = 0;
pe->pfn = pfn;
pe++;
@ -257,6 +258,7 @@ static int svsm_build_ca_from_psc_desc(struct snp_psc_desc *desc, unsigned int d
pe->page_size = e->pagesize ? RMP_PG_SIZE_2M : RMP_PG_SIZE_4K;
pe->action = e->operation == SNP_PAGE_STATE_PRIVATE;
pe->ignore_cf = 0;
pe->rsvd = 0;
pe->pfn = e->gfn;
pe++;