On 2/28/2024 7:20 AM, Paolo Bonzini wrote:
From: Sean Christopherson <seanjc@xxxxxxxxxx>
TDX will use a different shadow PTE entry value for MMIO from VMX. Add
members to kvm_arch and track value for MMIO per-VM instead of global
variables. By using the per-VM EPT entry value for MMIO, the existing VMX
logic is kept working. Introduce a separate setter function so that guest
TD can override later.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Message-Id: <229a18434e5d83f45b1fcd7bf1544d79db1becb6.1705965635.git.isaku.yamahata@xxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 ++
arch/x86/kvm/mmu.h | 1 +
arch/x86/kvm/mmu/mmu.c | 8 +++++---
arch/x86/kvm/mmu/spte.c | 10 ++++++++--
arch/x86/kvm/mmu/spte.h | 4 ++--
arch/x86/kvm/mmu/tdp_mmu.c | 6 +++---
6 files changed, 21 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 85dc0f7d09e3..a4514c2ef0ec 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1313,6 +1313,8 @@ struct kvm_arch {
*/
spinlock_t mmu_unsync_pages_lock;
+ u64 shadow_mmio_value;
+
struct iommu_domain *iommu_domain;
bool iommu_noncoherent;
#define __KVM_HAVE_ARCH_NONCOHERENT_DMA
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 60f21bb4c27b..2c54ba5b0a28 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -101,6 +101,7 @@ static inline u8 kvm_get_shadow_phys_bits(void)
}
void kvm_mmu_set_mmio_spte_mask(u64 mmio_value, u64 mmio_mask, u64 access_mask);
+void kvm_mmu_set_mmio_spte_value(struct kvm *kvm, u64 mmio_value);
Now, the new added function along with above function mislead people on
their names. It's easily to think
- kvm_mmu_set_mmio_spte_mask() is to set shadow_mmio_mask, while
- kvm_mmu_set_mmio_spte_value() is to set shadow_mmio_value
we'd better come up with a better name.
Other than it, the patch looks good to me.
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
