github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-06-01 02:53:36 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

KVM: arm64: Compute 52bit TTBR address and alignment

Browse Source 
52bit addresses from TTBR need extra adjustment and alignment
checks. Implement the requirements of the architecture.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2025-07-27 10:18:56 +01:00
parent 23cf13def0
commit e645226a9c
1 changed files with 12 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/arm64/kvm/at.c
View File

@ -28,6 +28,8 @@ static int get_ia_size(struct s1_walk_info *wi)
/* Return true if the IPA is out of the OA range */
static bool check_output_size(u64 ipa, struct s1_walk_info *wi)
{
if (wi->pa52bit)
return wi->max_oa_bits < 52 && (ipa & GENMASK_ULL(51, wi->max_oa_bits));
return wi->max_oa_bits < 48 && (ipa & GENMASK_ULL(47, wi->max_oa_bits));
}
@ -301,6 +303,16 @@ static int setup_s1_walk(struct kvm_vcpu *vcpu, struct s1_walk_info *wi,
x = 3 + ia_bits - ((3 - wi->sl) * stride + wi->pgshift);
wi->baddr = ttbr & TTBRx_EL1_BADDR;
if (wi->pa52bit) {
/*
* Force the alignment on 64 bytes for top-level tables
* smaller than 8 entries, since TTBR.BADDR[5:2] are used to
* store bits [51:48] of the first level of lookup.
*/
x = max(x, 6);
wi->baddr |= FIELD_GET(GENMASK_ULL(5, 2), ttbr) << 48;
}
/* R_VPBBF */
if (check_output_size(wi->baddr, wi))