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2007-12-14KVM: VMX: Reset mmu context when entering real modeEddie Dong
patch 8668a3c468ed55d19514117a5a959d91d3d03823 in mainline. Resetting an SMP guest will force AP enter real mode (RESET) with paging enabled in protected mode. While current enter_rmode() can only handle mode switch from nonpaging mode to real mode which leads to SMP reboot failure. Fix by reloading the mmu context on entering real mode. Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: VMX: Force vm86 mode if setting flags during real modeAvi Kivity
patch 78f7826868da8e27d097802139a3fec39f47f3b8 in mainline. When resetting from userspace, we need to handle the flags being cleared even after we are in real mode. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: Skip pio instruction when it is emulated, not executedAvi Kivity
patch 0967b7bf1c22b55777aba46ff616547feed0b141 in mainline. If we defer updating rip until pio instructions are executed, we have a problem with reset: a pio reset updates rip, and when the instruction completes we skip the emulated instruction, pointing rip somewhere completely unrelated. Fix by updating rip when we see decode the instruction, not after emulation. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: SVM: Fix FPU leak while emulating cltsAmit Shah
patch 404fb881b82cf0cf6981832f8d31a7484e4dee81 in mainline. The clts code didn't use set_cr0 properly, so our lazy FPU processing wasn't being done by the clts instruction at all. (this isn't called on Intel as the hardware does the decode for us) Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: Fix hang on uniprocessorMarko Kohtala
This is not in mainline, as it was fixed differently in that tree. first_cpu(cpus) returns the only CPU when NR_CPUS is 1 regardless of the cpus mask. Therefore we avoid a kernel hang in KVM_SET_MEMORY_REGION ioctl on uniprocessor by not entering the loop at all. Signed-off-by: Marko Kohtala <marko.kohtala@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: x86 emulator: Use emulator_write_emulated and not emulator_write_stdAmit Shah
patch 00b2ef475d4728ca53a2bc788c7978042907e354 in mainline. emulator_write_std() is not implemented, and calling write_emulated should work just as well in place of write_std. Fixes emulator failures with the push r/m instruction. Signed-off-by: Amit Shah <amit.shah@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: SVM: Intercept the 'invd' and 'wbinvd' instructionsAvi Kivity
patch cf5a94d1331b411b84414c13e43f578260942d6b in mainline. 'invd' can destroy host data, and 'wbinvd' allows the guest to induce long (milliseconds) latencies. Noted by Ben Serebrin. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: x86 emulator: invd instructionAvi Kivity
patch 651a3e29b3d19418d7a8a9787906061f9be7cc5f in mainline. Emulate the 'invd' instruction (opcode 0f 08). Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: x86 emulator: fix access registers for instructions with ModR/M byte ↵Aurelien Jarno
and Mod = 3 patch 4e62417bf317504c0b85e0d7abd236f334f54eaf in mainline. The patch belows changes the access type to register from memory for instructions that are declared as SrcMem or DstMem, but have a ModR/M byte with Mod = 3. It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU, which are needed for FreeBSD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-12-14KVM: x86 emulator: implement 'movnti mem, reg'Sheng Yang
patch a012e65aee48379a7a87eadafa74f878b61522b9 in mainline. Implement emulation of instruction: movnti m32/m64, r32/r64 opcode: 0x0f 0xc3 Needed to support Linux 2.6.16 as guest (used for mmio). Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2007-09-22KVM: Fix virtualization menu help textAvi Kivity
What guest drivers? Cc: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-09-14KVM: MMU: Fix rare oops on guest context switchAvi Kivity
A guest context switch to an uncached cr3 can require allocation of shadow pages, but we only recycle shadow pages in kvm_mmu_page_fault(). Move shadow page recycling to mmu_topup_memory_caches(), which is called from both the page fault handler and from guest cr3 reload. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-19KVM: Avoid calling smp_call_function_single() with interrupts disabledAvi Kivity
When taking a cpu down, we need to hardware_disable() it. Unfortunately, the CPU_DYING notifier is called with interrupts disabled, which means we can't use smp_call_function_single(). Fortunately, the CPU_DYING notifier is always called on the dying cpu, so we don't need to use the function at all and can simply call hardware_disable() directly. Tested-by: Paolo Ornati <ornati@fastwebnet.it> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-18Add some help texts to recently-introduced kconfig itemsJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@gmx.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (edited MACINTOSH_DRIVERS per Geert Uytterhoeven's remark) Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-06KVM: x86 emulator: fix debug reg mov instructionsAvi Kivity
More fallout from the writeback fixes: debug register transfer instructions do their own writeback and thus need to disable the general writeback mechanism. This fixes oopses and some guest failures on AMD machines (the Intel variant decodes the instruction in hardware and thus does not need emulation). Cc: Alistair John Strachan <alistair@devzero.co.uk> Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-25KVM: disable writeback for 0x0f 0x01 instructions.Aurelien Jarno
0x0f 0x01 instructions (ie lgdt, lidt, smsw, lmsw and invlpg) does not use writeback. This patch set no_wb=1 when emulating those instructions. This fixes a regression booting the FreeBSD kernel on AMD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-25KVM: Fix removal of nx capability from guest cpuidAvi Kivity
Testing the wrong bit caused kvm not to disable nx on the guest when it is disabled on the host (an mmu optimization relies on the nx bits being the same in the guest and host). This allows Windows to boot when nx is disabled on te host (e.g. when host pae is disabled). Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-25Revert "KVM: Avoid useless memory write when possible"Avi Kivity
This reverts commit a3c870bdce4d34332ebdba7eb9969592c4c6b243. While it does save useless updates, it (probably) defeats the fork detector, causing a massive performance loss. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-25KVM: Fix unlikely kvm_create vs decache_vcpus_on_cpu raceRusty Russell
We add the kvm to the vm_list before initializing the vcpu mutexes, which can be mutex_trylock()'ed by decache_vcpus_on_cpu(). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-25KVM: Correctly handle writes crossing a page boundaryAvi Kivity
Writes that are contiguous in virtual memory may not be contiguous in physical memory; so split writes that straddle a page boundary. Thanks to Aurelien for reporting the bug, patient testing, and a fix to this very patch. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-22KVM: Require CONFIG_ANON_INODESAvi Kivity
Found by Sebastian Siewior and randconfig. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-20KVM: MMU: Fix cleaning up the shadow page allocation cacheAvi Kivity
__free_page() wants a struct page, not a virtual address. Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-20KVM: MMU: Fix oopses with SLUBAvi Kivity
The kvm mmu uses page->private on shadow page tables; so does slub, and an oops result. Fix by allocating regular pages for shadows instead of using slub. Tested-by: S.Çağlar Onur <caglar@pardus.org.tr> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-20KVM: x86 emulator: implement rdmsr and wrmsrAvi Kivity
Allow real-mode emulation of rdmsr and wrmsr. This allows smp Windows to boot, presumably for its sipi trampoline. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-20KVM: Fix memory slot management functions for guest smpAvi Kivity
The memory slot management functions were oriented against vcpu 0, where they should be kvm-wide. This causes hangs starting X on guest smp. Fix by making the functions (and resultant tail in the mmu) non-vcpu-specific. Unfortunately this reduces the efficiency of the mmu object cache a bit. We may have to revisit this later. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-20KVM: MMU: Store nx bit for large page shadowsAvi Kivity
We need to distinguish between large page shadows which have the nx bit set and those which don't. The problem shows up when booting a newer smp Linux kernel, where the trampoline page (which is in real mode, which uses the same shadow pages as large pages) is using the same mapping as a kernel data page, which is mapped using nx, causing kvm to spin on that page. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-20mm: Remove slab destructors from kmem_cache_create().Paul Mundt
Slab destructors were no longer supported after Christoph's c59def9f222d44bb7e2f0a559f2906191a0862d7 change. They've been BUGs for both slab and slub, and slob never supported them either. This rips out support for the dtor pointer from kmem_cache_create() completely and fixes up every single callsite in the kernel (there were about 224, not including the slab allocator definitions themselves, or the documentation references). Signed-off-by: Paul Mundt <lethal@linux-sh.org>
2007-07-19i386: Allow KVM on i386 nonpaeAvi Kivity
Currently, CONFIG_X86_CMPXCHG64 both enables boot-time checking of the cmpxchg64b feature and enables compilation of the set_64bit() family. Since the option is dependent on PAE, and since KVM depends on set_64bit(), this effectively disables KVM on i386 nopae. Simplify by removing the config option altogether: the boot check is made dependent on CONFIG_X86_PAE directly, and the set_64bit() family is exposed without constraints. It is up to users to check for the feature flag (KVM does not as virtualiation extensions imply its existence). Signed-off-by: Avi Kivity <avi@qumranet.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-16KVM: Use CPU_DYING for disabling virtualizationAvi Kivity
Only at the CPU_DYING stage can we be sure that no user process will be scheduled onto the cpu and oops when trying to use virtualization extensions. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Tune hotplug/suspend IPIsAvi Kivity
The hotplug IPIs can be called from the cpu on which we are currently running on, so use on_cpu(). Similarly, drop on_each_cpu() for the suspend/resume callbacks, as we're in atomic context here and only one cpu is up anyway. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Keep track of which cpus have virtualization enabledAvi Kivity
By keeping track of which cpus have virtualization enabled, we prevent double-enable or double-disable during hotplug, which is a very fatal oops. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Clean up #includesAvi Kivity
Remove unnecessary ones, and rearange the remaining in the standard order. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Remove kvmfs in favor of the anonymous inodes sourceAvi Kivity
kvm uses a pseudo filesystem, kvmfs, to generate inodes, a job that the new anonymous inodes source does much better. Cc: Davide Libenzi <davidel@xmailserver.org> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: SVM: Reliably detect if SVM was disabled by BIOSJoerg Roedel
This patch adds an implementation to the svm is_disabled function to detect reliably if the BIOS disabled the SVM feature in the CPU. This fixes the issues with kernel panics when loading the kvm-amd module on machines where SVM is available but disabled. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: VMX: Remove unnecessary code in vmx_tlb_flush()Avi Kivity
A vmexit implicitly flushes the tlb; the code is bogus. Noted by Shaohua Li. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: MMU: Fix Wrong tlb flush orderShaohua Li
Need to flush the tlb after updating a pte, not before. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: VMX: Reinitialize the real-mode tss when entering real modeAvi Kivity
Protected mode code may have corrupted the real-mode tss, so re-initialize it when switching to real mode. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Avoid useless memory write when possibleLuca Tettamanti
When writing to normal memory and the memory area is unchanged the write can be safely skipped, avoiding the costly kvm_mmu_pte_write. Signed-Off-By: Luca Tettamanti <kronos.it@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Fix x86 emulator writebackLuca Tettamanti
When the old value and new one are the same the emulator skips the write; this is undesirable when the destination is a MMIO area and the write shall be performed regardless of the previous value. This optimization breaks e.g. a Linux guest APIC compiled without X86_GOOD_APIC. Remove the check and perform the writeback stage in the emulation unless it's explicitly disabled (currently push and some 2 bytes instructions may disable the writeback). Signed-Off-By: Luca Tettamanti <kronos.it@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Add support for in-kernel pio handlersEddie Dong
Useful for the PIC and PIT. Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: VMX: Fix interrupt checking on lightweight exitGregory Haskins
With kernel-injected interrupts, we need to check for interrupts on lightweight exits too. Signed-off-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Adds support for in-kernel mmio handlersGregory Haskins
Signed-off-by: Gregory Haskins <ghaskins@novell.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Implement emulation of instruction "ret" (opcode 0xc3)Nitin A Kamble
Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Implement emulation of "pop reg" instruction (opcode 0x58-0x5f)Nitin A Kamble
For use in real mode. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: VMX: Ensure vcpu time stamp counter is monotonousAvi Kivity
If the time stamp counter goes backwards, a guest delay loop can become infinite. This can happen if a vcpu is migrated to another cpu, where the counter has a lower value than the first cpu. Since we're doing an IPI to the first cpu anyway, we can use that to pick up the old tsc, and use that to calculate the adjustment we need to make to the tsc offset. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Initialize the BSP bit in the APIC_BASE msr correctlyAvi Kivity
Needs to be set on vcpu 0 only. Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: VMX: Replace memset(<addr>, 0, PAGESIZE) with clear_page(<addr>)Shani Moideen
Signed-off-by: Shani Moideen <shani.moideen@wipro.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: SVM: Replace memset(<addr>, 0, PAGESIZE) with clear_page(<addr>)Shani Moideen
Signed-off-by: Shani Moideen <shani.moideen@wipro.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Flush remote tlbs when reducing shadow pte permissionsAvi Kivity
When a vcpu causes a shadow tlb entry to have reduced permissions, it must also clear the tlb on remote vcpus. We do that by: - setting a bit on the vcpu that requests a tlb flush before the next entry - if the vcpu is currently executing, we send an ipi to make sure it exits before we continue Signed-off-by: Avi Kivity <avi@qumranet.com>
2007-07-16KVM: Keep an upper bound of initialized vcpusAvi Kivity
That way, we don't need to loop for KVM_MAX_VCPUS for a single vcpu vm. Signed-off-by: Avi Kivity <avi@qumranet.com>
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