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753c0d5a50
Implement nCR3 and NPT initialization functions, similar to the EPT equivalents, and create common TDP helpers for enablement checking and initialization. Enable NPT for nested guests by default if the TDP MMU was initialized, similar to VMX. Reuse the PTE masks from the main MMU in the NPT MMU, except for the C and S bits related to confidential VMs. Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev> Link: https://patch.msgid.link/20251230230150.4150236-17-seanjc@google.com [sean: apply Yosry's fixup for ncr3_gpa] Signed-off-by: Sean Christopherson <seanjc@google.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2020, Red Hat, Inc.
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*/
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#ifndef SELFTEST_KVM_SVM_UTILS_H
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#define SELFTEST_KVM_SVM_UTILS_H
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#include <asm/svm.h>
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#include <stdint.h>
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#include "svm.h"
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#include "processor.h"
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struct svm_test_data {
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/* VMCB */
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struct vmcb *vmcb; /* gva */
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void *vmcb_hva;
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uint64_t vmcb_gpa;
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/* host state-save area */
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struct vmcb_save_area *save_area; /* gva */
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void *save_area_hva;
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uint64_t save_area_gpa;
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/* MSR-Bitmap */
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void *msr; /* gva */
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void *msr_hva;
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uint64_t msr_gpa;
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/* NPT */
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uint64_t ncr3_gpa;
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};
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static inline void vmmcall(void)
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{
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/*
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* Stuff RAX and RCX with "safe" values to make sure L0 doesn't handle
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* it as a valid hypercall (e.g. Hyper-V L2 TLB flush) as the intended
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* use of this function is to exit to L1 from L2. Clobber all other
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* GPRs as L1 doesn't correctly preserve them during vmexits.
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*/
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__asm__ __volatile__("push %%rbp; vmmcall; pop %%rbp"
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: : "a"(0xdeadbeef), "c"(0xbeefdead)
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: "rbx", "rdx", "rsi", "rdi", "r8", "r9",
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"r10", "r11", "r12", "r13", "r14", "r15");
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}
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#define stgi() \
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__asm__ __volatile__( \
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"stgi\n" \
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)
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#define clgi() \
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__asm__ __volatile__( \
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"clgi\n" \
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)
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struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva);
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void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
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void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
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static inline bool kvm_cpu_has_npt(void)
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{
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return kvm_cpu_has(X86_FEATURE_NPT);
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}
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void vm_enable_npt(struct kvm_vm *vm);
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int open_sev_dev_path_or_exit(void);
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#endif /* SELFTEST_KVM_SVM_UTILS_H */
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