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https://github.com/hanzoai/visor.git
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Konstantin BogomolovandgVisor bot
595911350a
These are not as important as the instances that have already been replaced, because everything builds without these replacements. However, for consistency and for the sake of a couple of less jumps, let's replace these too. PiperOrigin-RevId: 681135990
69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
// Copyright 2018 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build amd64
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// +build amd64
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package kvm
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/unix"
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"gvisor.dev/gvisor/pkg/hostsyscall"
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)
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var (
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runDataSize int
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hasGuestPCID bool
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cpuidSupported = cpuidEntries{nr: _KVM_NR_CPUID_ENTRIES}
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)
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func updateSystemValues(fd int) error {
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// Extract the mmap size.
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sz, errno := hostsyscall.RawSyscall(unix.SYS_IOCTL, uintptr(fd), KVM_GET_VCPU_MMAP_SIZE, 0)
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if errno != 0 {
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return fmt.Errorf("getting VCPU mmap size: %v", errno)
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}
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// Save the data.
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runDataSize = int(sz)
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// Must do the dance to figure out the number of entries.
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errno = hostsyscall.RawSyscallErrno(
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unix.SYS_IOCTL,
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uintptr(fd),
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KVM_GET_SUPPORTED_CPUID,
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uintptr(unsafe.Pointer(&cpuidSupported)))
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if errno != 0 && errno != unix.ENOMEM {
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// Some other error occurred.
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return fmt.Errorf("getting supported CPUID: %v", errno)
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}
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// The number should now be correct.
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errno = hostsyscall.RawSyscallErrno(
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unix.SYS_IOCTL,
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uintptr(fd),
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KVM_GET_SUPPORTED_CPUID,
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uintptr(unsafe.Pointer(&cpuidSupported)))
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if errno != 0 {
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// Didn't work with the right number.
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return fmt.Errorf("getting supported CPUID (2nd attempt): %v", errno)
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}
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// Success.
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return nil
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}
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