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linux/arch/x86/kvm/kvm_cache_regs.h

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KVM: x86: accessors for guest registers As suggested by Avi, introduce accessors to read/write guest registers. This simplifies the ->cache_regs/->decache_regs interface, and improves register caching which is important for VMX, where the cost of vmcs_read/vmcs_write is significant. [avi: fix warnings] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-06-27 21:58:02 +04:00
#ifndef ASM_KVM_CACHE_REGS_H
#define ASM_KVM_CACHE_REGS_H
KVM: Optimize kvm_read_cr[04]_bits() 'mask' is always a constant, so we can check whether it includes a bit that might be owned by the guest very cheaply, and avoid the decache call. Saves a few hundred bytes of module text. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-01-21 16:31:51 +03:00
#define KVM_POSSIBLE_CR0_GUEST_BITS X86_CR0_TS
#define KVM_POSSIBLE_CR4_GUEST_BITS \
(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
| X86_CR4_OSXMMEXCPT | X86_CR4_PGE)
KVM: x86: accessors for guest registers As suggested by Avi, introduce accessors to read/write guest registers. This simplifies the ->cache_regs/->decache_regs interface, and improves register caching which is important for VMX, where the cost of vmcs_read/vmcs_write is significant. [avi: fix warnings] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-06-27 21:58:02 +04:00
static inline unsigned long kvm_register_read(struct kvm_vcpu *vcpu,
enum kvm_reg reg)
{
if (!test_bit(reg, (unsigned long *)&vcpu->arch.regs_avail))
kvm_x86_ops->cache_reg(vcpu, reg);
return vcpu->arch.regs[reg];
}
static inline void kvm_register_write(struct kvm_vcpu *vcpu,
enum kvm_reg reg,
unsigned long val)
{
vcpu->arch.regs[reg] = val;
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_dirty);
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
}
static inline unsigned long kvm_rip_read(struct kvm_vcpu *vcpu)
{
return kvm_register_read(vcpu, VCPU_REGS_RIP);
}
static inline void kvm_rip_write(struct kvm_vcpu *vcpu, unsigned long val)
{
kvm_register_write(vcpu, VCPU_REGS_RIP, val);
}
KVM: Cache pdptrs Instead of reloading the pdptrs on every entry and exit (vmcs writes on vmx, guest memory access on svm) extract them on demand. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-05-31 23:58:47 +04:00
static inline u64 kvm_pdptr_read(struct kvm_vcpu *vcpu, int index)
{
KVM: kvm_pdptr_read() may sleep Annotate it thusly. Signed-off-by: Avi Kivity <avi@redhat.com>
2010-05-04 14:00:55 +04:00
might_sleep(); /* on svm */
KVM: Cache pdptrs Instead of reloading the pdptrs on every entry and exit (vmcs writes on vmx, guest memory access on svm) extract them on demand. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-05-31 23:58:47 +04:00
if (!test_bit(VCPU_EXREG_PDPTR,
(unsigned long *)&vcpu->arch.regs_avail))
kvm_x86_ops->cache_reg(vcpu, VCPU_EXREG_PDPTR);
return vcpu->arch.pdptrs[index];
}
KVM: Replace read accesses of vcpu->arch.cr0 by an accessor Since we'd like to allow the guest to own a few bits of cr0 at times, we need to know when we access those bits. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-29 19:07:30 +03:00
static inline ulong kvm_read_cr0_bits(struct kvm_vcpu *vcpu, ulong mask)
{
KVM: Optimize kvm_read_cr[04]_bits() 'mask' is always a constant, so we can check whether it includes a bit that might be owned by the guest very cheaply, and avoid the decache call. Saves a few hundred bytes of module text. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-01-21 16:31:51 +03:00
ulong tmask = mask & KVM_POSSIBLE_CR0_GUEST_BITS;
if (tmask & vcpu->arch.cr0_guest_owned_bits)
KVM: VMX: Allow the guest to own some cr0 bits We will use this later to give the guest ownership of cr0.ts. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-29 19:43:06 +03:00
kvm_x86_ops->decache_cr0_guest_bits(vcpu);
KVM: Replace read accesses of vcpu->arch.cr0 by an accessor Since we'd like to allow the guest to own a few bits of cr0 at times, we need to know when we access those bits. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-29 19:07:30 +03:00
return vcpu->arch.cr0 & mask;
}
static inline ulong kvm_read_cr0(struct kvm_vcpu *vcpu)
{
return kvm_read_cr0_bits(vcpu, ~0UL);
}
KVM: Add accessor for reading cr4 (or some bits of cr4) Some bits of cr4 can be owned by the guest on vmx, so when we read them, we copy them to the vcpu structure. In preparation for making the set of guest-owned bits dynamic, use helpers to access these bits so we don't need to know where the bit resides. No changes to svm since all bits are host-owned there. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-07 13:16:48 +03:00
static inline ulong kvm_read_cr4_bits(struct kvm_vcpu *vcpu, ulong mask)
{
KVM: Optimize kvm_read_cr[04]_bits() 'mask' is always a constant, so we can check whether it includes a bit that might be owned by the guest very cheaply, and avoid the decache call. Saves a few hundred bytes of module text. Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-01-21 16:31:51 +03:00
ulong tmask = mask & KVM_POSSIBLE_CR4_GUEST_BITS;
if (tmask & vcpu->arch.cr4_guest_owned_bits)
KVM: Add accessor for reading cr4 (or some bits of cr4) Some bits of cr4 can be owned by the guest on vmx, so when we read them, we copy them to the vcpu structure. In preparation for making the set of guest-owned bits dynamic, use helpers to access these bits so we don't need to know where the bit resides. No changes to svm since all bits are host-owned there. Signed-off-by: Avi Kivity <avi@redhat.com>
2009-12-07 13:16:48 +03:00
kvm_x86_ops->decache_cr4_guest_bits(vcpu);
return vcpu->arch.cr4 & mask;
}
static inline ulong kvm_read_cr4(struct kvm_vcpu *vcpu)
{
return kvm_read_cr4_bits(vcpu, ~0UL);
}
KVM: x86: accessors for guest registers As suggested by Avi, introduce accessors to read/write guest registers. This simplifies the ->cache_regs/->decache_regs interface, and improves register caching which is important for VMX, where the cost of vmcs_read/vmcs_write is significant. [avi: fix warnings] Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2008-06-27 21:58:02 +04:00
#endif
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