Mingwei Zhang 4bbd693d9f KVM: SVM: Flush when freeing encrypted pages even on SME_COHERENT CPUs
commit d45829b351ee6ec5f54dd55e6aca1f44fe239fe6 upstream.

Use clflush_cache_range() to flush the confidential memory when
SME_COHERENT is supported in AMD CPU. Cache flush is still needed since
SME_COHERENT only support cache invalidation at CPU side. All confidential
cache lines are still incoherent with DMA devices.

Cc: stable@vger.kerel.org

Fixes: add5e2f04541 ("KVM: SVM: Add support for the SEV-ES VMSA")
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Mingwei Zhang <mizhang@google.com>
Message-Id: <20220421031407.2516575-3-mizhang@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-27 14:39:00 +02:00
..
2022-01-11 15:35:15 +01:00
2021-03-18 15:31:53 +01:00
2021-06-28 15:40:51 -07:00