diff options
| author | Fuad Tabba <tabba@google.com> | 2024-06-03 15:28:47 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-06-04 17:06:33 +0300 |
| commit | 66d5b53e20a6e00b7ce3b652a3e2db967f7b33d0 (patch) | |
| tree | 18f77f59a02c28da6abe85df94d16d2dbde15c03 /arch/arm64/kvm/hyp/nvhe/pkvm.c | |
| parent | e511e08a9f496948b13aac50610f2d17335f56c3 (diff) | |
| download | linux-66d5b53e20a6e00b7ce3b652a3e2db967f7b33d0.tar.xz | |
KVM: arm64: Allocate memory mapped at hyp for host sve state in pKVM
Protected mode needs to maintain (save/restore) the host's sve
state, rather than relying on the host kernel to do that. This is
to avoid leaking information to the host about guests and the
type of operations they are performing.
As a first step towards that, allocate memory mapped at hyp, per
cpu, for the host sve state. The following patch will use this
memory to save/restore the host state.
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://lore.kernel.org/r/20240603122852.3923848-6-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
Diffstat (limited to 'arch/arm64/kvm/hyp/nvhe/pkvm.c')
| -rw-r--r-- | arch/arm64/kvm/hyp/nvhe/pkvm.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/nvhe/pkvm.c b/arch/arm64/kvm/hyp/nvhe/pkvm.c index 16aa4875ddb8..25e9a94f6d76 100644 --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -18,6 +18,8 @@ unsigned long __icache_flags; /* Used by kvm_get_vttbr(). */ unsigned int kvm_arm_vmid_bits; +unsigned int kvm_host_sve_max_vl; + /* * Set trap register values based on features in ID_AA64PFR0. */ |