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35a7831912
Add svm_asm*() macros, a la the existing vmx_asm*() macros, to handle faults on SVM instructions instead of using the generic __ex(), a.k.a. __kvm_handle_fault_on_reboot(). Using asm goto generates slightly better code as it eliminates the in-line JMP+CALL sequences that are needed by __kvm_handle_fault_on_reboot() to avoid triggering BUG() from fixup (which generates bad stack traces). Using SVM specific macros also drops the last user of __ex() and the the last asm linkage to kvm_spurious_fault(), and adds a helper for VMSAVE, which may gain an addition call site in the future (as part of optimizing the SVM context switching). Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20201231002702.2223707-8-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_SVM_OPS_H
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#define __KVM_X86_SVM_OPS_H
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#include <linux/compiler_types.h>
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#include <asm/kvm_host.h>
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#define svm_asm(insn, clobber...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) "\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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::: clobber : fault); \
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return; \
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fault: \
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kvm_spurious_fault(); \
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} while (0)
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#define svm_asm1(insn, op1, clobber...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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:: op1 : clobber : fault); \
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return; \
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fault: \
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kvm_spurious_fault(); \
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} while (0)
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#define svm_asm2(insn, op1, op2, clobber...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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:: op1, op2 : clobber : fault); \
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return; \
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fault: \
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kvm_spurious_fault(); \
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} while (0)
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static inline void clgi(void)
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{
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svm_asm(clgi);
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}
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static inline void stgi(void)
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{
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svm_asm(stgi);
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}
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static inline void invlpga(unsigned long addr, u32 asid)
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{
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svm_asm2(invlpga, "c"(asid), "a"(addr));
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}
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/*
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* Despite being a physical address, the portion of rAX that is consumed by
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* VMSAVE, VMLOAD, etc... is still controlled by the effective address size,
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* hence 'unsigned long' instead of 'hpa_t'.
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*/
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static inline void vmsave(unsigned long pa)
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{
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svm_asm1(vmsave, "a" (pa), "memory");
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}
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#endif /* __KVM_X86_SVM_OPS_H */
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