Commit be1bd4c5 authored by Peter Gonda's avatar Peter Gonda Committed by Sean Christopherson
Browse files

KVM: selftests: Allow tagging protected memory in guest page tables 



Add support for tagging and untagging guest physical address, e.g. to
allow x86's SEV and TDX guests to embed shared vs. private information in
the GPA.  SEV (encryption, a.k.a. C-bit) and TDX (shared, a.k.a. S-bit)
steal bits from the guest's physical address space that is consumed by the
CPU metadata, i.e. effectively aliases the "real" GPA.

Implement generic "tagging" so that the shared vs. private metadata can be
managed by x86 without bleeding too many details into common code.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Vishal Annapurve <vannapurve@google.com>
Cc: Ackerly Tng <ackerleytng@google.com>
cc: Andrew Jones <andrew.jones@linux.dev>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Michael Roth <michael.roth@amd.com>
Tested-by: default avatarCarlos Bilbao <carlos.bilbao@amd.com>
Originally-by: default avatarMichael Roth <michael.roth@amd.com>
Signed-off-by: default avatarPeter Gonda <pgonda@google.com>
Link: https://lore.kernel.org/r/20240223004258.3104051-8-seanjc@google.com


Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
parent 31e00dae

tools/testing/selftests/kvm/include/aarch64/kvm_util_arch.h

0 → 100644
+7 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef SELFTEST_KVM_UTIL_ARCH_H

#define SELFTEST_KVM_UTIL_ARCH_H



struct kvm_vm_arch {};



#endif  // SELFTEST_KVM_UTIL_ARCH_H

tools/testing/selftests/kvm/include/kvm_util_base.h

+13 −0
Original line number Diff line number Diff line
@@ -18,9 +18,11 @@ 
#include <linux/types.h>



#include <asm/atomic.h>

#include <asm/kvm.h>



#include <sys/ioctl.h>



#include "kvm_util_arch.h"

#include "sparsebit.h"



/*
@@ -113,6 +115,9 @@ struct kvm_vm { 
	vm_vaddr_t idt;

	vm_vaddr_t handlers;

	uint32_t dirty_ring_size;

	uint64_t gpa_tag_mask;



	struct kvm_vm_arch arch;



	/* Cache of information for binary stats interface */

	int stats_fd;
@@ -601,6 +606,12 @@ void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva); 
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva);

void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa);





static inline vm_paddr_t vm_untag_gpa(struct kvm_vm *vm, vm_paddr_t gpa)

{

	return gpa & ~vm->gpa_tag_mask;

}



void vcpu_run(struct kvm_vcpu *vcpu);

int _vcpu_run(struct kvm_vcpu *vcpu);
@@ -1113,4 +1124,6 @@ void kvm_selftest_arch_init(void); 


void kvm_arch_vm_post_create(struct kvm_vm *vm);



bool vm_is_gpa_protected(struct kvm_vm *vm, vm_paddr_t paddr);



#endif /* SELFTEST_KVM_UTIL_BASE_H */

tools/testing/selftests/kvm/include/riscv/kvm_util_arch.h

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/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef SELFTEST_KVM_UTIL_ARCH_H

#define SELFTEST_KVM_UTIL_ARCH_H



struct kvm_vm_arch {};



#endif  // SELFTEST_KVM_UTIL_ARCH_H

tools/testing/selftests/kvm/include/s390x/kvm_util_arch.h

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+7 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef SELFTEST_KVM_UTIL_ARCH_H

#define SELFTEST_KVM_UTIL_ARCH_H



struct kvm_vm_arch {};



#endif  // SELFTEST_KVM_UTIL_ARCH_H

tools/testing/selftests/kvm/include/x86_64/kvm_util_arch.h

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/* SPDX-License-Identifier: GPL-2.0-only */

#ifndef SELFTEST_KVM_UTIL_ARCH_H

#define SELFTEST_KVM_UTIL_ARCH_H



#include <stdbool.h>

#include <stdint.h>



struct kvm_vm_arch {

	uint64_t c_bit;

	uint64_t s_bit;

};



static inline bool __vm_arch_has_protected_memory(struct kvm_vm_arch *arch)

{

	return arch->c_bit || arch->s_bit;

}



#define vm_arch_has_protected_memory(vm) \

	__vm_arch_has_protected_memory(&(vm)->arch)



#endif  // SELFTEST_KVM_UTIL_ARCH_H