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KVM hypercalls use the VMCALL or VMMCALL instructions. Although the ABI is similar, those instructions no longer function for TDX guests. Make vendor-specific TDVMCALLs instead of VMCALL. This enables TDX guests to run with KVM acting as the hypervisor. Among other things, KVM hypercall is used to send IPIs. Since the KVM driver can be built as a kernel module, export tdx_kvm_hypercall() to make the symbols visible to kvm.ko. Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20220405232939.73860-20-kirill.shutemov@linux.intel.com
179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_KVM_PARA_H
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#define _ASM_X86_KVM_PARA_H
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#include <asm/processor.h>
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#include <asm/alternative.h>
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#include <linux/interrupt.h>
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#include <uapi/asm/kvm_para.h>
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#include <asm/tdx.h>
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#ifdef CONFIG_KVM_GUEST
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bool kvm_check_and_clear_guest_paused(void);
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#else
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static inline bool kvm_check_and_clear_guest_paused(void)
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{
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return false;
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}
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#endif /* CONFIG_KVM_GUEST */
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#define KVM_HYPERCALL \
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ALTERNATIVE("vmcall", "vmmcall", X86_FEATURE_VMMCALL)
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/* For KVM hypercalls, a three-byte sequence of either the vmcall or the vmmcall
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* instruction. The hypervisor may replace it with something else but only the
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* instructions are guaranteed to be supported.
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*
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* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
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* The hypercall number should be placed in rax and the return value will be
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* placed in rax. No other registers will be clobbered unless explicitly
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* noted by the particular hypercall.
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*/
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static inline long kvm_hypercall0(unsigned int nr)
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{
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long ret;
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if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
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return tdx_kvm_hypercall(nr, 0, 0, 0, 0);
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asm volatile(KVM_HYPERCALL
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: "=a"(ret)
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: "a"(nr)
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: "memory");
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return ret;
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}
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static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
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{
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long ret;
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if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
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return tdx_kvm_hypercall(nr, p1, 0, 0, 0);
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asm volatile(KVM_HYPERCALL
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: "=a"(ret)
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: "a"(nr), "b"(p1)
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: "memory");
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return ret;
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}
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static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
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unsigned long p2)
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{
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long ret;
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if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
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return tdx_kvm_hypercall(nr, p1, p2, 0, 0);
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asm volatile(KVM_HYPERCALL
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: "=a"(ret)
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: "a"(nr), "b"(p1), "c"(p2)
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: "memory");
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return ret;
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}
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static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3)
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{
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long ret;
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if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
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return tdx_kvm_hypercall(nr, p1, p2, p3, 0);
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asm volatile(KVM_HYPERCALL
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: "=a"(ret)
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: "a"(nr), "b"(p1), "c"(p2), "d"(p3)
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: "memory");
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return ret;
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}
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static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3,
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unsigned long p4)
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{
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long ret;
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if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST))
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return tdx_kvm_hypercall(nr, p1, p2, p3, p4);
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asm volatile(KVM_HYPERCALL
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: "=a"(ret)
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: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4)
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: "memory");
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return ret;
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}
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static inline long kvm_sev_hypercall3(unsigned int nr, unsigned long p1,
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unsigned long p2, unsigned long p3)
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{
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long ret;
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asm volatile("vmmcall"
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: "=a"(ret)
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: "a"(nr), "b"(p1), "c"(p2), "d"(p3)
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: "memory");
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return ret;
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}
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#ifdef CONFIG_KVM_GUEST
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void kvmclock_init(void);
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void kvmclock_disable(void);
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bool kvm_para_available(void);
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unsigned int kvm_arch_para_features(void);
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unsigned int kvm_arch_para_hints(void);
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void kvm_async_pf_task_wait_schedule(u32 token);
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void kvm_async_pf_task_wake(u32 token);
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u32 kvm_read_and_reset_apf_flags(void);
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bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
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DECLARE_STATIC_KEY_FALSE(kvm_async_pf_enabled);
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static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
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{
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if (static_branch_unlikely(&kvm_async_pf_enabled))
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return __kvm_handle_async_pf(regs, token);
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else
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return false;
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}
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#ifdef CONFIG_PARAVIRT_SPINLOCKS
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void __init kvm_spinlock_init(void);
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#else /* !CONFIG_PARAVIRT_SPINLOCKS */
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static inline void kvm_spinlock_init(void)
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{
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}
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#endif /* CONFIG_PARAVIRT_SPINLOCKS */
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#else /* CONFIG_KVM_GUEST */
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#define kvm_async_pf_task_wait_schedule(T) do {} while(0)
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#define kvm_async_pf_task_wake(T) do {} while(0)
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static inline bool kvm_para_available(void)
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{
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return false;
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}
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static inline unsigned int kvm_arch_para_features(void)
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{
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return 0;
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}
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static inline unsigned int kvm_arch_para_hints(void)
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{
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return 0;
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}
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static inline u32 kvm_read_and_reset_apf_flags(void)
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{
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return 0;
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}
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static __always_inline bool kvm_handle_async_pf(struct pt_regs *regs, u32 token)
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{
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return false;
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}
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#endif
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#endif /* _ASM_X86_KVM_PARA_H */
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