mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-18 04:30:08 +07:00
6e2020977e
Now that VMREAD flows require a taken branch, courtesy of commit
3901336ed9 ("x86/kvm: Don't call kvm_spurious_fault() from .fixup")
bite the bullet and add full error handling to VMREAD, i.e. replace the
JMP added by __ex()/____kvm_handle_fault_on_reboot() with a hinted Jcc.
To minimize the code footprint, add a helper function, vmread_error(),
to handle both faults and failures so that the inline flow has a single
CALL.
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
306 lines
8.4 KiB
C
306 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KVM_X86_VMX_INSN_H
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#define __KVM_X86_VMX_INSN_H
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#include <linux/nospec.h>
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#include <asm/kvm_host.h>
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#include <asm/vmx.h>
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#include "evmcs.h"
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#include "vmcs.h"
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#define __ex(x) __kvm_handle_fault_on_reboot(x)
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asmlinkage void vmread_error(unsigned long field, bool fault);
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void vmwrite_error(unsigned long field, unsigned long value);
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void vmclear_error(struct vmcs *vmcs, u64 phys_addr);
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void vmptrld_error(struct vmcs *vmcs, u64 phys_addr);
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void invvpid_error(unsigned long ext, u16 vpid, gva_t gva);
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void invept_error(unsigned long ext, u64 eptp, gpa_t gpa);
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static __always_inline void vmcs_check16(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
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"16-bit accessor invalid for 64-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"16-bit accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"16-bit accessor invalid for 32-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"16-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_check32(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"32-bit accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"32-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_check64(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"64-bit accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"64-bit accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"64-bit accessor invalid for 32-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x6000,
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"64-bit accessor invalid for natural width field");
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}
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static __always_inline void vmcs_checkl(unsigned long field)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0,
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"Natural width accessor invalid for 16-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2000,
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"Natural width accessor invalid for 64-bit field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6001) == 0x2001,
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"Natural width accessor invalid for 64-bit high field");
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x4000,
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"Natural width accessor invalid for 32-bit field");
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}
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static __always_inline unsigned long __vmcs_readl(unsigned long field)
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{
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unsigned long value;
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asm volatile("1: vmread %2, %1\n\t"
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".byte 0x3e\n\t" /* branch taken hint */
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"ja 3f\n\t"
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"mov %2, %%" _ASM_ARG1 "\n\t"
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"xor %%" _ASM_ARG2 ", %%" _ASM_ARG2 "\n\t"
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"2: call vmread_error\n\t"
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"xor %k1, %k1\n\t"
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"3:\n\t"
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".pushsection .fixup, \"ax\"\n\t"
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"4: mov %2, %%" _ASM_ARG1 "\n\t"
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"mov $1, %%" _ASM_ARG2 "\n\t"
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"jmp 2b\n\t"
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".popsection\n\t"
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_ASM_EXTABLE(1b, 4b)
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: ASM_CALL_CONSTRAINT, "=r"(value) : "r"(field) : "cc");
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return value;
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}
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static __always_inline u16 vmcs_read16(unsigned long field)
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{
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vmcs_check16(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_read16(field);
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return __vmcs_readl(field);
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}
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static __always_inline u32 vmcs_read32(unsigned long field)
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{
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vmcs_check32(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_read32(field);
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return __vmcs_readl(field);
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}
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static __always_inline u64 vmcs_read64(unsigned long field)
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{
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vmcs_check64(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_read64(field);
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#ifdef CONFIG_X86_64
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return __vmcs_readl(field);
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#else
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return __vmcs_readl(field) | ((u64)__vmcs_readl(field+1) << 32);
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#endif
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}
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static __always_inline unsigned long vmcs_readl(unsigned long field)
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{
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vmcs_checkl(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_read64(field);
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return __vmcs_readl(field);
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}
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#define vmx_asm1(insn, op1, error_args...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %0\n\t" \
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".byte 0x2e\n\t" /* branch not taken hint */ \
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"jna %l[error]\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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: : op1 : "cc" : error, fault); \
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return; \
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error: \
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insn##_error(error_args); \
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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 vmx_asm2(insn, op1, op2, error_args...) \
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do { \
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asm_volatile_goto("1: " __stringify(insn) " %1, %0\n\t" \
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".byte 0x2e\n\t" /* branch not taken hint */ \
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"jna %l[error]\n\t" \
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_ASM_EXTABLE(1b, %l[fault]) \
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: : op1, op2 : "cc" : error, fault); \
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return; \
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error: \
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insn##_error(error_args); \
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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 __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
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{
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vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
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}
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static __always_inline void vmcs_write16(unsigned long field, u16 value)
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{
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vmcs_check16(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write16(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_write32(unsigned long field, u32 value)
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{
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vmcs_check32(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write32(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_write64(unsigned long field, u64 value)
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{
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vmcs_check64(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write64(field, value);
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__vmcs_writel(field, value);
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#ifndef CONFIG_X86_64
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__vmcs_writel(field+1, value >> 32);
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#endif
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}
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static __always_inline void vmcs_writel(unsigned long field, unsigned long value)
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{
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vmcs_checkl(field);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write64(field, value);
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__vmcs_writel(field, value);
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}
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static __always_inline void vmcs_clear_bits(unsigned long field, u32 mask)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
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"vmcs_clear_bits does not support 64-bit fields");
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write32(field, evmcs_read32(field) & ~mask);
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__vmcs_writel(field, __vmcs_readl(field) & ~mask);
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}
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static __always_inline void vmcs_set_bits(unsigned long field, u32 mask)
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{
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BUILD_BUG_ON_MSG(__builtin_constant_p(field) && ((field) & 0x6000) == 0x2000,
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"vmcs_set_bits does not support 64-bit fields");
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_write32(field, evmcs_read32(field) | mask);
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__vmcs_writel(field, __vmcs_readl(field) | mask);
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}
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static inline void vmcs_clear(struct vmcs *vmcs)
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{
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u64 phys_addr = __pa(vmcs);
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vmx_asm1(vmclear, "m"(phys_addr), vmcs, phys_addr);
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}
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static inline void vmcs_load(struct vmcs *vmcs)
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{
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u64 phys_addr = __pa(vmcs);
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if (static_branch_unlikely(&enable_evmcs))
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return evmcs_load(phys_addr);
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vmx_asm1(vmptrld, "m"(phys_addr), vmcs, phys_addr);
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}
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static inline void __invvpid(unsigned long ext, u16 vpid, gva_t gva)
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{
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struct {
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u64 vpid : 16;
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u64 rsvd : 48;
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u64 gva;
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} operand = { vpid, 0, gva };
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vmx_asm2(invvpid, "r"(ext), "m"(operand), ext, vpid, gva);
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}
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static inline void __invept(unsigned long ext, u64 eptp, gpa_t gpa)
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{
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struct {
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u64 eptp, gpa;
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} operand = {eptp, gpa};
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vmx_asm2(invept, "r"(ext), "m"(operand), ext, eptp, gpa);
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}
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static inline bool vpid_sync_vcpu_addr(int vpid, gva_t addr)
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{
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if (vpid == 0)
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return true;
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if (cpu_has_vmx_invvpid_individual_addr()) {
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__invvpid(VMX_VPID_EXTENT_INDIVIDUAL_ADDR, vpid, addr);
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return true;
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}
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return false;
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}
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static inline void vpid_sync_vcpu_single(int vpid)
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{
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if (vpid == 0)
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return;
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if (cpu_has_vmx_invvpid_single())
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__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vpid, 0);
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}
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static inline void vpid_sync_vcpu_global(void)
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{
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if (cpu_has_vmx_invvpid_global())
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__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
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}
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static inline void vpid_sync_context(int vpid)
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{
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if (cpu_has_vmx_invvpid_single())
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vpid_sync_vcpu_single(vpid);
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else
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vpid_sync_vcpu_global();
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}
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static inline void ept_sync_global(void)
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{
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__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
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}
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static inline void ept_sync_context(u64 eptp)
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{
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if (cpu_has_vmx_invept_context())
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__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
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else
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ept_sync_global();
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}
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#endif /* __KVM_X86_VMX_INSN_H */
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