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

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.

Tom Lendacky committed 1 year ago

Commit 3ee9ceb1 parent c08ba632 files · +3 −0Browse files

Unified · Split

2 files

arch/x86/boot/startup/sev-shared.c +1 −0
arch/x86/coco/sev/core.c +2 −0

arch/x86/boot/startup/sev-shared.c+1−0

@@ -785,6 +785,7 @@ static void __head svsm_pval_4k_page(unsigned long paddr, bool validate) · 784 unmodified lines
785	785	pc->entry[0].page_size = RMP_PG_SIZE_4K;
786	786	pc->entry[0].action = validate;
787	787	pc->entry[0].ignore_cf = 0;
	788	+ pc->entry[0].rsvd = 0;
788	789	pc->entry[0].pfn = paddr >> PAGE_SHIFT;
789	790
790	791	/* Protocol 0, Call ID 1 */

arch/x86/coco/sev/core.c+2−0

@@ -227,6 +227,7 @@ static u64 svsm_build_ca_from_pfn_range(u64 pfn, u64 pfn_end, bool action, · 226 unmodified lines
227	227	pe->page_size = RMP_PG_SIZE_4K;
228	228	pe->action = action;
229	229	pe->ignore_cf = 0;
	230	+ pe->rsvd = 0;
230	231	pe->pfn = pfn;
231	232
232	233	pe++;
@@ -257,6 +258,7 @@ static int svsm_build_ca_from_psc_desc(struct snp_psc_desc *desc, unsigned int d · 24 unmodified lines
257	258	pe->page_size = e->pagesize ? RMP_PG_SIZE_2M : RMP_PG_SIZE_4K;
258	259	pe->action = e->operation == SNP_PAGE_STATE_PRIVATE;
259	260	pe->ignore_cf = 0;
	261	+ pe->rsvd = 0;
260	262	pe->pfn = e->gfn;
261	263
262	264	pe++;