- 03 5月, 2007 15 次提交
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由 Avi Kivity 提交于
Noted by Joerg Roedel. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Joerg Roedel 提交于
This patch enables the virtualization of the last branch record MSRs on SVM if this feature is available in hardware. It also introduces a small and simple check feature for specific SVM extensions. Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Michal Piotrowski 提交于
Remove unused function CC drivers/kvm/svm.o drivers/kvm/svm.c:207: warning: ‘inject_db’ defined but not used Signed-off-by: NMichal Piotrowski <michal.k.k.piotrowski@gmail.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
When a vcpu is migrated from one cpu to another, its timestamp counter may lose its monotonic property if the host has unsynced timestamp counters. This can confuse the guest, sometimes to the point of refusing to boot. As the rdtsc instruction is rather fast on AMD processors (7-10 cycles), we can simply record the last host tsc when we drop the cpu, and adjust the vcpu tsc offset when we detect that we've migrated to a different cpu. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Joerg Roedel 提交于
This patch forbids the guest to execute monitor/mwait instructions on SVM. This is necessary because the guest can execute these instructions if they are available even if the kvm cpuid doesn't report its existence. Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Trivial cleanup. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
The cpu cache is a host resource; the guest should not be able to turn it off (even for itself). Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
set_cr0_no_modeswitch() was a hack to avoid corrupting segment registers. As we now cache the protected mode values on entry to real mode, this isn't an issue anymore, and it interferes with reboot (which usually _is_ a modeswitch). Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
The current string pio interface communicates using guest virtual addresses, relying on userspace to translate addresses and to check permissions. This interface cannot fully support guest smp, as the check needs to take into account two pages at one in case an unaligned string transfer straddles a page boundary. Change the interface not to communicate guest addresses at all; instead use a buffer page (mmaped by userspace) and do transfers there. The kernel manages the virtual to physical translation and can perform the checks atomically by taking the appropriate locks. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Older userspace didn't care, but newer userspace (with the cpuid changes) does. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
This is redundant, as we also return -EINTR from the ioctl, but it allows us to examine the exit_reason field on resume without seeing old data. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Currently, userspace is told about the nature of the last exit from the guest using two fields, exit_type and exit_reason, where exit_type has just two enumerations (and no need for more). So fold exit_type into exit_reason, reducing the complexity of determining what really happened. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
KVM used to handle cpuid by letting userspace decide what values to return to the guest. We now handle cpuid completely in the kernel. We still let userspace decide which values the guest will see by having userspace set up the value table beforehand (this is necessary to allow management software to set the cpu features to the least common denominator, so that live migration can work). The motivation for the change is that kvm kernel code can be impacted by cpuid features, for example the x86 emulator. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Currently when passing the a PIO emulation request to userspace, we rely on userspace updating %rax (on 'in' instructions) and %rsi/%rdi/%rcx (on string instructions). This (a) requires two extra ioctls for getting and setting the registers and (b) is unfriendly to non-x86 archs, when they get kvm ports. So fix by doing the register fixups in the kernel and passing to userspace only an abstract description of the PIO to be done. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Dor Laor 提交于
Instead of twiddling the rip registers directly, use the skip_emulated_instruction() function to do that for us. Signed-off-by: NDor Laor <dor.laor@qumranet.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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- 04 3月, 2007 8 次提交
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由 Avi Kivity 提交于
Allocate a distinct inode for every vcpu in a VM. This has the following benefits: - the filp cachelines are no longer bounced when f_count is incremented on every ioctl() - the API and internal code are distinctly clearer; for example, on the KVM_GET_REGS ioctl, there is no need to copy the vcpu number from userspace and then copy the registers back; the vcpu identity is derived from the fd used to make the call Right now the performance benefits are completely theoretical since (a) we don't support more than one vcpu per VM and (b) virtualization hardware inefficiencies completely everwhelm any cacheline bouncing effects. But both of these will change, and we need to prepare the API today. Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Joerg Roedel 提交于
This patch changes the SVM code to intercept SMIs and handle it outside the guest. Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Ingo Molnar 提交于
This adds a special MSR based hypercall API to KVM. This is to be used by paravirtual kernels and virtual drivers. Signed-off-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Ahmed S. Darwish 提交于
Signed-off-by: NAhmed S. Darwish <darwish.07@gmail.com> Signed-off-by: NDor Laor <dor.laor@qumranet.com> Signed-off-by: NAvi Kivity <avi@qumranet.com>
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com>
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- 13 2月, 2007 3 次提交
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由 Avi Kivity 提交于
On hotplug, we execute the hardware extension enable sequence. On unplug, we decache any vcpus that last ran on the exiting cpu, and execute the hardware extension disable sequence. Signed-off-by: NAvi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Avi Kivity 提交于
This allows us to run the mmu testsuite on amd. Signed-off-by: NAvi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Avi Kivity 提交于
The kvm mmu relies on cr0.wp being set even if the guest does not set it. The vmx code correctly forces cr0.wp at all times, the svm code does not, so it can't boot solaris without this patch. Signed-off-by: NAvi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 10 2月, 2007 1 次提交
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由 Al Viro 提交于
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 31 1月, 2007 1 次提交
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由 Robert P. J. Day 提交于
Fix what looks like an obvious typo in the file drivers/kvm/svm.c. Signed-off-by: NRobert P. J. Day <rpjday@mindspring.com> Acked-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 27 1月, 2007 2 次提交
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由 Joerg Roedel 提交于
This patch implements forwarding of SHUTDOWN intercepts from the guest on to userspace on AMD SVM. A SHUTDOWN event occurs when the guest produces a triple fault (e.g. on reboot). This also fixes the bug that a guest reboot actually causes a host reboot under some circumstances. Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com> Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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由 Leonard Norrgard 提交于
There's an obvious typo in svm_{get,set}_idt, causing it to access the ldt instead. Because these functions are only called for save/load on AMD, the bug does not impact normal operation. With the fix, save/load works as expected on AMD hosts. Signed-off-by: NUri Lublin <uril@qumranet.com> Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 23 1月, 2007 1 次提交
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由 Avi Kivity 提交于
The kvm mmio read path looks like: 1. guest read faults 2. kvm emulates read, calls emulator_read_emulated() 3. fails as a read requires userspace help 4. exit to userspace 5. userspace emulates read, kvm sets vcpu->mmio_read_completed 6. re-enter guest, fault again 7. kvm emulates read, calls emulator_read_emulated() 8. succeeds as vcpu->mmio_read_emulated is set 9. instruction completes and guest is resumed A problem surfaces if the userspace exit (step 5) also requests an interrupt injection. In that case, the guest does not re-execute the original instruction, but the interrupt handler. The next time an mmio read is exectued (likely for a different address), step 3 will find vcpu->mmio_read_completed set and return the value read for the original instruction. The problem manifested itself in a few annoying ways: - little squares appear randomly on console when switching virtual terminals - ne2000 fails under nfs read load - rtl8139 complains about "pci errors" even though the device model is incapable of issuing them. Fix by skipping interrupt injection if an mmio read is pending. A better fix is to avoid re-entry into the guest, and re-emulating immediately instead. However that's a bit more complex. Signed-off-by: NAvi Kivity <avi@qumranet.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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- 12 1月, 2007 1 次提交
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由 Ingo Molnar 提交于
This adds the profile=kvm boot option, which enables KVM to profile VM exits. Use: "readprofile -m ./System.map | sort -n" to see the resulting output: [...] 18246 serial_out 148.3415 18945 native_flush_tlb 378.9000 23618 serial_in 212.7748 29279 __spin_unlock_irq 622.9574 43447 native_apic_write 2068.9048 52702 enable_8259A_irq 742.2817 54250 vgacon_scroll 89.3740 67394 ide_inb 6126.7273 79514 copy_page_range 98.1654 84868 do_wp_page 86.6000 140266 pit_read 783.6089 151436 ide_outb 25239.3333 152668 native_io_delay 21809.7143 174783 mask_and_ack_8259A 783.7803 362404 native_set_pte_at 36240.4000 1688747 total 0.5009 Signed-off-by: NIngo Molnar <mingo@elte.hu> Acked-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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- 06 1月, 2007 6 次提交
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由 Dor Laor 提交于
No need to test for rflags.if as both VT and SVM specs assure us that on exit caused from interrupt window opening, 'if' is set. Signed-off-by: NDor Laor <dor.laor@qumranet.com> Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Avi Kivity 提交于
Since we write protect shadowed guest page tables, there is no need to trap page invalidations (the guest will always change the mapping before issuing the invlpg instruction). Signed-off-by: NAvi Kivity <avi@qumranet.com> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Avi Kivity 提交于
When beginning to process a page fault, make sure we have enough shadow pages available to service the fault. If not, free some pages. Signed-off-by: NAvi Kivity <avi@qumranet.com> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Avi Kivity 提交于
Hardware virtualization implementations allow the guests to freely change some of the bits in cr0 and cr4, but trap when changing the other bits. This is useful to avoid excessive exits due to changing, for example, the ts flag. It also means the kvm's copy of cr0 and cr4 may be stale with respect to these bits. most of the time this doesn't matter as these bits are not very interesting. Other times, however (for example when returning cr0 to userspace), they are, so get the fresh contents of these bits from the guest by means of a new arch operation. Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Dor Laor 提交于
The current interrupt injection mechanism might delay an interrupt under the following circumstances: - if injection fails because the guest is not interruptible (rflags.IF clear, or after a 'mov ss' or 'sti' instruction). Userspace can check rflags, but the other cases or not testable under the current API. - if injection fails because of a fault during delivery. This probably never happens under normal guests. - if injection fails due to a physical interrupt causing a vmexit so that it can be handled by the host. In all cases the guest proceeds without processing the interrupt, reducing the interactive feel and interrupt throughput of the guest. This patch fixes the situation by allowing userspace to request an exit when the 'interrupt window' opens, so that it can re-inject the interrupt at the right time. Guest interactivity is very visibly improved. Signed-off-by: NDor Laor <dor.laor@qumranet.com> Signed-off-by: NAvi Kivity <avi@qumranet.com> Acked-by: NIngo Molnar <mingo@elte.hu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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- 31 12月, 2006 2 次提交
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由 Avi Kivity 提交于
Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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由 Avi Kivity 提交于
Resolves sourceforge bug 1622229 (guest crashes running benchmark software). Signed-off-by: NAvi Kivity <avi@qumranet.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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