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openSUSE:Leap:15.5:Update
xen.8389
5b3cab8e-2-VMX-improve-MSR-load-save-API.patch
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File 5b3cab8e-2-VMX-improve-MSR-load-save-API.patch of Package xen.8389
# Commit f54b63e8617ada823be43d60467a43c8224b7909 # Date 2018-07-04 12:12:14 +0100 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86/vmx: API improvements for MSR load/save infrastructure Collect together related infrastructure in vmcs.h, rather than having it spread out. Turn vmx_{read,write}_guest_msr() into static inlines, as they are simple enough. Replace 'int type' with 'enum vmx_msr_list_type', and use switch statements internally. Later changes are going to introduce a new type. Rename the type identifiers for consistency with the other VMX_MSR_* constants. No functional change. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Roger Pau Monné <roger.pau@citrix.com> Acked-by: Kevin Tian <kevin.tian@intel.com> --- a/xen/arch/x86/hvm/vmx/vmcs.c +++ b/xen/arch/x86/hvm/vmx/vmcs.c @@ -1296,22 +1296,26 @@ static int vmx_msr_entry_key_cmp(const v return 0; } -struct vmx_msr_entry *vmx_find_msr(u32 msr, int type) +struct vmx_msr_entry *vmx_find_msr(uint32_t msr, enum vmx_msr_list_type type) { struct vcpu *curr = current; unsigned int msr_count; - struct vmx_msr_entry *msr_area; + struct vmx_msr_entry *msr_area = NULL; - if ( type == VMX_GUEST_MSR ) + switch ( type ) { - msr_count = curr->arch.hvm_vmx.msr_count; - msr_area = curr->arch.hvm_vmx.msr_area; - } - else - { - ASSERT(type == VMX_HOST_MSR); + case VMX_MSR_HOST: msr_count = curr->arch.hvm_vmx.host_msr_count; msr_area = curr->arch.hvm_vmx.host_msr_area; + break; + + case VMX_MSR_GUEST: + msr_count = curr->arch.hvm_vmx.msr_count; + msr_area = curr->arch.hvm_vmx.msr_area; + break; + + default: + ASSERT_UNREACHABLE(); } if ( msr_area == NULL ) @@ -1321,48 +1325,27 @@ struct vmx_msr_entry *vmx_find_msr(u32 m vmx_msr_entry_key_cmp); } -int vmx_read_guest_msr(u32 msr, u64 *val) -{ - struct vmx_msr_entry *ent; - - if ( (ent = vmx_find_msr(msr, VMX_GUEST_MSR)) != NULL ) - { - *val = ent->data; - return 0; - } - - return -ESRCH; -} - -int vmx_write_guest_msr(u32 msr, u64 val) -{ - struct vmx_msr_entry *ent; - - if ( (ent = vmx_find_msr(msr, VMX_GUEST_MSR)) != NULL ) - { - ent->data = val; - return 0; - } - - return -ESRCH; -} - -int vmx_add_msr(u32 msr, int type) +int vmx_add_msr(uint32_t msr, enum vmx_msr_list_type type) { struct vcpu *curr = current; unsigned int idx, *msr_count; struct vmx_msr_entry **msr_area, *msr_area_elem; - if ( type == VMX_GUEST_MSR ) - { - msr_count = &curr->arch.hvm_vmx.msr_count; - msr_area = &curr->arch.hvm_vmx.msr_area; - } - else + switch ( type ) { - ASSERT(type == VMX_HOST_MSR); + case VMX_MSR_HOST: msr_count = &curr->arch.hvm_vmx.host_msr_count; msr_area = &curr->arch.hvm_vmx.host_msr_area; + break; + + case VMX_MSR_GUEST: + msr_count = &curr->arch.hvm_vmx.msr_count; + msr_area = &curr->arch.hvm_vmx.msr_area; + break; + + default: + ASSERT_UNREACHABLE(); + return -EINVAL; } if ( *msr_area == NULL ) @@ -1370,13 +1353,17 @@ int vmx_add_msr(u32 msr, int type) if ( (*msr_area = alloc_xenheap_page()) == NULL ) return -ENOMEM; - if ( type == VMX_GUEST_MSR ) + switch ( type ) { + case VMX_MSR_HOST: + __vmwrite(VM_EXIT_MSR_LOAD_ADDR, virt_to_maddr(*msr_area)); + break; + + case VMX_MSR_GUEST: __vmwrite(VM_EXIT_MSR_STORE_ADDR, virt_to_maddr(*msr_area)); __vmwrite(VM_ENTRY_MSR_LOAD_ADDR, virt_to_maddr(*msr_area)); + break; } - else - __vmwrite(VM_EXIT_MSR_LOAD_ADDR, virt_to_maddr(*msr_area)); } for ( idx = 0; idx < *msr_count && (*msr_area)[idx].index <= msr; idx++ ) @@ -1395,16 +1382,18 @@ int vmx_add_msr(u32 msr, int type) ++*msr_count; - if ( type == VMX_GUEST_MSR ) + switch ( type ) { + case VMX_MSR_HOST: + rdmsrl(msr, msr_area_elem->data); + __vmwrite(VM_EXIT_MSR_LOAD_COUNT, *msr_count); + break; + + case VMX_MSR_GUEST: msr_area_elem->data = 0; __vmwrite(VM_EXIT_MSR_STORE_COUNT, *msr_count); __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, *msr_count); - } - else - { - rdmsrl(msr, msr_area_elem->data); - __vmwrite(VM_EXIT_MSR_LOAD_COUNT, *msr_count); + break; } return 0; --- a/xen/arch/x86/hvm/vmx/vmx.c +++ b/xen/arch/x86/hvm/vmx/vmx.c @@ -4196,7 +4196,7 @@ static void lbr_tsx_fixup(void) struct vmx_msr_entry *msr_area = curr->arch.hvm_vmx.msr_area; struct vmx_msr_entry *msr; - if ( (msr = vmx_find_msr(lbr_from_start, VMX_GUEST_MSR)) != NULL ) + if ( (msr = vmx_find_msr(lbr_from_start, VMX_MSR_GUEST)) != NULL ) { /* * Sign extend into bits 61:62 while preserving bit 63 @@ -4206,7 +4206,7 @@ static void lbr_tsx_fixup(void) msr->data |= ((LBR_FROM_SIGNEXT_2MSB & msr->data) << 2); } - if ( (msr = vmx_find_msr(lbr_lastint_from, VMX_GUEST_MSR)) != NULL ) + if ( (msr = vmx_find_msr(lbr_lastint_from, VMX_MSR_GUEST)) != NULL ) msr->data |= ((LBR_FROM_SIGNEXT_2MSB & msr->data) << 2); } @@ -4234,8 +4234,8 @@ static void bdw_erratum_bdf14_fixup(void * erratum BDF14. Fix up MSR_IA32_LASTINT{FROM,TO}IP by * sign-extending into bits 48:63. */ - sign_extend_msr(MSR_IA32_LASTINTFROMIP, VMX_GUEST_MSR); - sign_extend_msr(MSR_IA32_LASTINTTOIP, VMX_GUEST_MSR); + sign_extend_msr(MSR_IA32_LASTINTFROMIP, VMX_MSR_GUEST); + sign_extend_msr(MSR_IA32_LASTINTTOIP, VMX_MSR_GUEST); } static void lbr_fixup(void) --- a/xen/include/asm-x86/hvm/vmx/vmcs.h +++ b/xen/include/asm-x86/hvm/vmx/vmcs.h @@ -511,9 +511,6 @@ enum vmcs_field { #define VMCS_VPID_WIDTH 16 -#define VMX_GUEST_MSR 0 -#define VMX_HOST_MSR 1 - /* VM Instruction error numbers */ enum vmx_insn_errno { @@ -531,6 +528,52 @@ enum vmx_insn_errno VMX_INSN_FAIL_INVALID = ~0, }; +/* MSR load/save list infrastructure. */ +enum vmx_msr_list_type { + VMX_MSR_HOST, /* MSRs loaded on VMExit. */ + VMX_MSR_GUEST, /* MSRs saved on VMExit, loaded on VMEntry. */ +}; + +int vmx_add_msr(uint32_t msr, enum vmx_msr_list_type type); + +static inline int vmx_add_host_load_msr(uint32_t msr) +{ + return vmx_add_msr(msr, VMX_MSR_HOST); +} + +static inline int vmx_add_guest_msr(uint32_t msr) +{ + return vmx_add_msr(msr, VMX_MSR_GUEST); +} + +struct vmx_msr_entry *vmx_find_msr(uint32_t msr, enum vmx_msr_list_type type); + +static inline int vmx_read_guest_msr(uint32_t msr, uint64_t *val) +{ + const struct vmx_msr_entry *ent = vmx_find_msr(msr, VMX_MSR_GUEST); + + if ( !ent ) + return -ESRCH; + + *val = ent->data; + + return 0; +} + +static inline int vmx_write_guest_msr(uint32_t msr, uint64_t val) +{ + struct vmx_msr_entry *ent = vmx_find_msr(msr, VMX_MSR_GUEST); + + if ( !ent ) + return -ESRCH; + + ent->data = val; + + return 0; +} + + +/* MSR intercept bitmap infrastructure. */ enum vmx_msr_intercept_type { VMX_MSR_R = 1, VMX_MSR_W = 2, @@ -541,10 +584,6 @@ void vmx_clear_msr_intercept(struct vcpu enum vmx_msr_intercept_type type); void vmx_set_msr_intercept(struct vcpu *v, unsigned int msr, enum vmx_msr_intercept_type type); -int vmx_read_guest_msr(u32 msr, u64 *val); -int vmx_write_guest_msr(u32 msr, u64 val); -struct vmx_msr_entry *vmx_find_msr(u32 msr, int type); -int vmx_add_msr(u32 msr, int type); void vmx_vmcs_switch(paddr_t from, paddr_t to); void vmx_set_eoi_exit_bitmap(struct vcpu *v, u8 vector); void vmx_clear_eoi_exit_bitmap(struct vcpu *v, u8 vector); @@ -559,15 +598,6 @@ void virtual_vmcs_vmwrite(const struct v enum vmx_insn_errno virtual_vmcs_vmwrite_safe(const struct vcpu *v, u32 vmcs_encoding, u64 val); -static inline int vmx_add_guest_msr(u32 msr) -{ - return vmx_add_msr(msr, VMX_GUEST_MSR); -} -static inline int vmx_add_host_load_msr(u32 msr) -{ - return vmx_add_msr(msr, VMX_HOST_MSR); -} - DECLARE_PER_CPU(bool_t, vmxon); bool_t vmx_vcpu_pml_enabled(const struct vcpu *v);
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