KVM: x86: Disallow read-only memslots for SEV-ES and SEV-SNP (and TDX)

Disallow read-only memslots for SEV-{ES,SNP} VM types, as KVM can't
directly emulate instructions for ES/SNP, and instead the guest must
explicitly request emulation.  Unless the guest explicitly requests
emulation without accessing memory, ES/SNP relies on KVM creating an MMIO
SPTE, with the subsequent #NPF being reflected into the guest as a #VC.

But for read-only memslots, KVM deliberately doesn't create MMIO SPTEs,
because except for ES/SNP, doing so requires setting reserved bits in the
SPTE, i.e. the SPTE can't be readable while also generating a #VC on
writes.  Because KVM never creates MMIO SPTEs and jumps directly to
emulation, the guest never gets a #VC.  And since KVM simply resumes the
guest if ES/SNP guests trigger emulation, KVM effectively puts the vCPU
into an infinite #NPF loop if the vCPU attempts to write read-only memory.

Disallow read-only memory for all VMs with protected state, i.e. for
upcoming TDX VMs as well as ES/SNP VMs.  For TDX, it's actually possible
to support read-only memory, as TDX uses EPT Violation #VE to reflect the
fault into the guest, e.g. KVM could configure read-only SPTEs with RX
protections and SUPPRESS_VE=0.  But there is no strong use case for
supporting read-only memslots on TDX, e.g. the main historical usage is
to emulate option ROMs, but TDX disallows executing from shared memory.
And if someone comes along with a legitimate, strong use case, the
restriction can always be lifted for TDX.

Don't bother trying to retroactively apply the restriction to SEV-ES
VMs that are created as type KVM_X86_DEFAULT_VM.  Read-only memslots can't
possibly work for SEV-ES, i.e. disallowing such memslots is really just
means reporting an error to userspace instead of silently hanging vCPUs.
Trying to deal with the ordering between KVM_SEV_INIT and memslot creation
isn't worth the marginal benefit it would provide userspace.

Fixes: 26c44aa9e076 ("KVM: SEV: define VM types for SEV and SEV-ES")
Fixes: 1dfe571c12cf ("KVM: SEV: Add initial SEV-SNP support")
Cc: Peter Gonda <[email protected]>
Cc: Michael Roth <[email protected]>
Cc: Vishal Annapurve <[email protected]>
Cc: Ackerly Tng <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Message-ID: <20240809190319.1710470[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 94e7b5a4fafeb5d7c60a281a34b13cda30755d5f..4a68cb3eba78f81d4187cbdc3f5f6b529b001140 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2192,6 +2192,8 @@ void kvm_configure_mmu(bool enable_tdp, int tdp_forced_root_level,
 #define kvm_arch_has_private_mem(kvm) false
 #endif
 
+#define kvm_arch_has_readonly_mem(kvm) (!(kvm)->arch.has_protected_state)
+
 static inline u16 kvm_read_ldt(void)
 {
        u16 ldt;

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 79a6b1a63027a410559187bfc0d0722516be9316..b23c6d48392f7c4e37252bc19de9aacfe6759b5f 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -715,6 +715,13 @@ static inline bool kvm_arch_has_private_mem(struct kvm *kvm)
 }
 #endif
 
+#ifndef kvm_arch_has_readonly_mem
+static inline bool kvm_arch_has_readonly_mem(struct kvm *kvm)
+{
+       return IS_ENABLED(CONFIG_HAVE_KVM_READONLY_MEM);
+}
+#endif
+
 struct kvm_memslots {
        u64 generation;
        atomic_long_t last_used_slot;

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 92901656a0d413651741ebd069d335f8f5f161be..cb2b78e92910fb1d6ebed0b73cf359e866f0a06b 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1578,15 +1578,14 @@ static int check_memory_region_flags(struct kvm *kvm,
        if (mem->flags & KVM_MEM_GUEST_MEMFD)
                valid_flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
 
-#ifdef CONFIG_HAVE_KVM_READONLY_MEM
        /*
         * GUEST_MEMFD is incompatible with read-only memslots, as writes to
         * read-only memslots have emulated MMIO, not page fault, semantics,
         * and KVM doesn't allow emulated MMIO for private memory.
         */
-       if (!(mem->flags & KVM_MEM_GUEST_MEMFD))
+       if (kvm_arch_has_readonly_mem(kvm) &&
+           !(mem->flags & KVM_MEM_GUEST_MEMFD))
                valid_flags |= KVM_MEM_READONLY;
-#endif
 
        if (mem->flags & ~valid_flags)
                return -EINVAL;