Commit 1c04d8c9 authored by Tom Lendacky's avatar Tom Lendacky Committed by Paolo Bonzini
Browse files

KVM: x86: Mark GPRs dirty when written 



When performing VMGEXIT processing for an SEV-ES guest, register values
will be synced between KVM and the GHCB. Prepare for detecting when a GPR
has been updated (marked dirty) in order to determine whether to sync the
register to the GHCB.

Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Message-Id: <7ca2a1cdb61456f2fe9c64193e34d601e395c133.1607620209.git.thomas.lendacky@amd.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent add5e2f0

arch/x86/kvm/kvm_cache_regs.h

+26 −25
Original line number Diff line number Diff line
@@ -9,6 +9,31 @@ 
	(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR  \

	 | X86_CR4_OSXMMEXCPT | X86_CR4_PGE | X86_CR4_TSD | X86_CR4_FSGSBASE)



static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu,

					     enum kvm_reg reg)

{

	return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

}



static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu,

					 enum kvm_reg reg)

{

	return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);

}



static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu,

					       enum kvm_reg reg)

{

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

}



static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu,

					   enum kvm_reg reg)

{

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);

}



#define BUILD_KVM_GPR_ACCESSORS(lname, uname)				      \

static __always_inline unsigned long kvm_##lname##_read(struct kvm_vcpu *vcpu)\

{									      \
@@ -18,6 +43,7 @@ static __always_inline void kvm_##lname##_write(struct kvm_vcpu *vcpu, \ 
						unsigned long val)	      \

{									      \

	vcpu->arch.regs[VCPU_REGS_##uname] = val;			      \

	kvm_register_mark_dirty(vcpu, VCPU_REGS_##uname);		      \

}

BUILD_KVM_GPR_ACCESSORS(rax, RAX)

BUILD_KVM_GPR_ACCESSORS(rbx, RBX)
@@ -37,31 +63,6 @@ BUILD_KVM_GPR_ACCESSORS(r14, R14) 
BUILD_KVM_GPR_ACCESSORS(r15, R15)

#endif



static inline bool kvm_register_is_available(struct kvm_vcpu *vcpu,

					     enum kvm_reg reg)

{

	return test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

}



static inline bool kvm_register_is_dirty(struct kvm_vcpu *vcpu,

					 enum kvm_reg reg)

{

	return test_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);

}



static inline void kvm_register_mark_available(struct kvm_vcpu *vcpu,

					       enum kvm_reg reg)

{

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

}



static inline void kvm_register_mark_dirty(struct kvm_vcpu *vcpu,

					   enum kvm_reg reg)

{

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);

	__set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);

}



static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu, int reg)

{

	if (WARN_ON_ONCE((unsigned int)reg >= NR_VCPU_REGS))

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