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-rw-r--r--pkg/sentry/platform/kvm/bluepill_arm64.go30
-rw-r--r--pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go16
-rw-r--r--pkg/sentry/platform/kvm/kvm_const_arm64.go41
-rw-r--r--pkg/sentry/platform/kvm/machine_arm64.go4
-rw-r--r--pkg/sentry/platform/kvm/machine_arm64_unsafe.go5
-rw-r--r--pkg/sentry/platform/ring0/defs_arm64.go6
-rw-r--r--pkg/sentry/platform/ring0/lib_arm64.go4
7 files changed, 83 insertions, 23 deletions
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64.go b/pkg/sentry/platform/kvm/bluepill_arm64.go
index 552341721..c215d443c 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64.go
@@ -54,6 +54,14 @@ func bluepillArchExit(c *vCPU, context *arch.SignalContext64) {
context.Pstate = regs.Pstate
context.Pstate &^= uint64(ring0.UserFlagsClear)
context.Pstate |= ring0.UserFlagsSet
+
+ lazyVfp := c.GetLazyVFP()
+ if lazyVfp != 0 {
+ fpsimd := fpsimdPtr((*byte)(c.floatingPointState))
+ context.Fpsimd64.Fpsr = fpsimd.Fpsr
+ context.Fpsimd64.Fpcr = fpsimd.Fpcr
+ context.Fpsimd64.Vregs = fpsimd.Vregs
+ }
}
// KernelSyscall handles kernel syscalls.
@@ -64,6 +72,17 @@ func (c *vCPU) KernelSyscall() {
if regs.Regs[8] != ^uint64(0) {
regs.Pc -= 4 // Rewind.
}
+
+ vfpEnable := ring0.CPACREL1()
+ if vfpEnable != 0 {
+ fpsimd := fpsimdPtr((*byte)(c.floatingPointState))
+ fpcr := ring0.GetFPCR()
+ fpsr := ring0.GetFPSR()
+ fpsimd.Fpcr = uint32(fpcr)
+ fpsimd.Fpsr = uint32(fpsr)
+ ring0.SaveVRegs((*byte)(c.floatingPointState))
+ }
+
ring0.Halt()
}
@@ -75,5 +94,16 @@ func (c *vCPU) KernelException(vector ring0.Vector) {
if vector == ring0.Vector(bounce) {
regs.Pc = 0
}
+
+ vfpEnable := ring0.CPACREL1()
+ if vfpEnable != 0 {
+ fpsimd := fpsimdPtr((*byte)(c.floatingPointState))
+ fpcr := ring0.GetFPCR()
+ fpsr := ring0.GetFPSR()
+ fpsimd.Fpcr = uint32(fpcr)
+ fpsimd.Fpsr = uint32(fpsr)
+ ring0.SaveVRegs((*byte)(c.floatingPointState))
+ }
+
ring0.Halt()
}
diff --git a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
index 195331383..4ca2b7717 100644
--- a/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/bluepill_arm64_unsafe.go
@@ -17,10 +17,19 @@
package kvm
import (
+ "unsafe"
+
"gvisor.dev/gvisor/pkg/sentry/arch"
"gvisor.dev/gvisor/pkg/sentry/platform/ring0"
)
+// fpsimdPtr returns a fpsimd64 for the given address.
+//
+//go:nosplit
+func fpsimdPtr(addr *byte) *arch.FpsimdContext {
+ return (*arch.FpsimdContext)(unsafe.Pointer(addr))
+}
+
// dieArchSetup initialies the state for dieTrampoline.
//
// The arm64 dieTrampoline requires the vCPU to be set in R1, and the last PC
@@ -45,3 +54,10 @@ func dieArchSetup(c *vCPU, context *arch.SignalContext64, guestRegs *userRegs) {
context.Regs[1] = uint64(uintptr(unsafe.Pointer(c)))
context.Pc = uint64(dieTrampolineAddr)
}
+
+// bluepillArchFpContext returns the arch-specific fpsimd context.
+//
+//go:nosplit
+func bluepillArchFpContext(context unsafe.Pointer) *arch.FpsimdContext {
+ return &((*arch.SignalContext64)(context).Fpsimd64)
+}
diff --git a/pkg/sentry/platform/kvm/kvm_const_arm64.go b/pkg/sentry/platform/kvm/kvm_const_arm64.go
index 5a74c6e36..531ae8b1e 100644
--- a/pkg/sentry/platform/kvm/kvm_const_arm64.go
+++ b/pkg/sentry/platform/kvm/kvm_const_arm64.go
@@ -19,30 +19,31 @@ const (
_KVM_GET_ONE_REG = 0x4010aeab
_KVM_SET_ONE_REG = 0x4010aeac
- _KVM_ARM_PREFERRED_TARGET = 0x8020aeaf
- _KVM_ARM_VCPU_INIT = 0x4020aeae
- _KVM_ARM64_REGS_PSTATE = 0x6030000000100042
- _KVM_ARM64_REGS_SP_EL1 = 0x6030000000100044
- _KVM_ARM64_REGS_R0 = 0x6030000000100000
- _KVM_ARM64_REGS_R1 = 0x6030000000100002
- _KVM_ARM64_REGS_R2 = 0x6030000000100004
- _KVM_ARM64_REGS_R3 = 0x6030000000100006
- _KVM_ARM64_REGS_R8 = 0x6030000000100010
- _KVM_ARM64_REGS_R18 = 0x6030000000100024
- _KVM_ARM64_REGS_PC = 0x6030000000100040
- _KVM_ARM64_REGS_MAIR_EL1 = 0x603000000013c510
- _KVM_ARM64_REGS_TCR_EL1 = 0x603000000013c102
- _KVM_ARM64_REGS_TTBR0_EL1 = 0x603000000013c100
- _KVM_ARM64_REGS_TTBR1_EL1 = 0x603000000013c101
- _KVM_ARM64_REGS_SCTLR_EL1 = 0x603000000013c080
- _KVM_ARM64_REGS_CPACR_EL1 = 0x603000000013c082
- _KVM_ARM64_REGS_VBAR_EL1 = 0x603000000013c600
+ _KVM_ARM_TARGET_GENERIC_V8 = 5
+ _KVM_ARM_PREFERRED_TARGET = 0x8020aeaf
+ _KVM_ARM_VCPU_INIT = 0x4020aeae
+ _KVM_ARM64_REGS_PSTATE = 0x6030000000100042
+ _KVM_ARM64_REGS_SP_EL1 = 0x6030000000100044
+ _KVM_ARM64_REGS_R0 = 0x6030000000100000
+ _KVM_ARM64_REGS_R1 = 0x6030000000100002
+ _KVM_ARM64_REGS_R2 = 0x6030000000100004
+ _KVM_ARM64_REGS_R3 = 0x6030000000100006
+ _KVM_ARM64_REGS_R8 = 0x6030000000100010
+ _KVM_ARM64_REGS_R18 = 0x6030000000100024
+ _KVM_ARM64_REGS_PC = 0x6030000000100040
+ _KVM_ARM64_REGS_MAIR_EL1 = 0x603000000013c510
+ _KVM_ARM64_REGS_TCR_EL1 = 0x603000000013c102
+ _KVM_ARM64_REGS_TTBR0_EL1 = 0x603000000013c100
+ _KVM_ARM64_REGS_TTBR1_EL1 = 0x603000000013c101
+ _KVM_ARM64_REGS_SCTLR_EL1 = 0x603000000013c080
+ _KVM_ARM64_REGS_CPACR_EL1 = 0x603000000013c082
+ _KVM_ARM64_REGS_VBAR_EL1 = 0x603000000013c600
)
// Arm64: Architectural Feature Access Control Register EL1.
const (
- _FPEN_NOTRAP = 0x3
- _FPEN_SHIFT = 0x20
+ _FPEN_NOTRAP = 3
+ _FPEN_SHIFT = 20
)
// Arm64: System Control Register EL1.
diff --git a/pkg/sentry/platform/kvm/machine_arm64.go b/pkg/sentry/platform/kvm/machine_arm64.go
index 09552837a..e42505542 100644
--- a/pkg/sentry/platform/kvm/machine_arm64.go
+++ b/pkg/sentry/platform/kvm/machine_arm64.go
@@ -28,6 +28,10 @@ type vCPUArchState struct {
//
// This starts above fixedKernelPCID.
PCIDs *pagetables.PCIDs
+
+ // floatingPointState is the floating point state buffer used in guest
+ // to host transitions. See usage in bluepill_arm64.go.
+ floatingPointState *arch.FloatingPointData
}
const (
diff --git a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
index b531f2f85..00801dee6 100644
--- a/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
+++ b/pkg/sentry/platform/kvm/machine_arm64_unsafe.go
@@ -123,6 +123,7 @@ func (c *vCPU) initArchState() error {
reg.addr = uint64(reflect.ValueOf(&data).Pointer())
regGet.addr = uint64(reflect.ValueOf(&dataGet).Pointer())
+ vcpuInit.target = _KVM_ARM_TARGET_GENERIC_V8
vcpuInit.features[0] |= (1 << _KVM_ARM_VCPU_PSCI_0_2)
if _, _, errno := syscall.RawSyscall(
syscall.SYS_IOCTL,
@@ -134,7 +135,8 @@ func (c *vCPU) initArchState() error {
// cpacr_el1
reg.id = _KVM_ARM64_REGS_CPACR_EL1
- data = (_FPEN_NOTRAP << _FPEN_SHIFT)
+ // It is off by default, and it is turned on only when in use.
+ data = 0 // Disable fpsimd.
if err := c.setOneRegister(&reg); err != nil {
return err
}
@@ -226,6 +228,7 @@ func (c *vCPU) initArchState() error {
return err
}
+ c.floatingPointState = arch.NewFloatingPointData()
return nil
}
diff --git a/pkg/sentry/platform/ring0/defs_arm64.go b/pkg/sentry/platform/ring0/defs_arm64.go
index 1583dda12..0e2ab716c 100644
--- a/pkg/sentry/platform/ring0/defs_arm64.go
+++ b/pkg/sentry/platform/ring0/defs_arm64.go
@@ -124,6 +124,12 @@ func (c *CPU) SetAppAddr(value uintptr) {
c.appAddr = value
}
+// GetLazyVFP returns the value of cpacr_el1.
+//go:nosplit
+func (c *CPU) GetLazyVFP() (value uintptr) {
+ return c.lazyVFP
+}
+
// SwitchArchOpts are embedded in SwitchOpts.
type SwitchArchOpts struct {
// UserASID indicates that the application ASID to be used on switch,
diff --git a/pkg/sentry/platform/ring0/lib_arm64.go b/pkg/sentry/platform/ring0/lib_arm64.go
index af075aae4..80922f43d 100644
--- a/pkg/sentry/platform/ring0/lib_arm64.go
+++ b/pkg/sentry/platform/ring0/lib_arm64.go
@@ -20,13 +20,13 @@ package ring0
func CPACREL1() (value uintptr)
// FPCR returns the value of FPCR register.
-func FPCR() (value uintptr)
+func GetFPCR() (value uintptr)
// SetFPCR writes the FPCR value.
func SetFPCR(value uintptr)
// FPSR returns the value of FPSR register.
-func FPSR() (value uintptr)
+func GetFPSR() (value uintptr)
// SetFPSR writes the FPSR value.
func SetFPSR(value uintptr)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 16:38:32 +0000