- 11 May, 2011 40 commits
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Jeff Mahoney authored
This patch avoids gcc issuing the following warning when KVM_MAX_VCPUS=1: warning: array subscript is above array bounds kvm_for_each_vcpu currently checks to see if the index for the vcpu is valid /after/ loading it. We don't run into problems because the address is still inside the enclosing struct kvm and we never deference or write to it, so this isn't a security issue. The warning occurs when KVM_MAX_VCPUS=1 because the increment portion of the loop will *always* cause the loop to load an invalid location since ++idx will always be > 0. This patch moves the load so that the check occurs before the load and we don't run into the compiler warning. Signed-off-by:
Neil Brown <neilb@suse.de> Signed-off-by:
Jeff Mahoney <jeffm@suse.com> Signed-off-by:
Avi Kivity <avi@redhat.com>
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Serge E. Hallyn authored
When doing a soft int, we need to bump eip before pushing it to the stack. Otherwise we'll do the int a second time. [apw@canonical.com: merged eip update as per Jan's recommendation.] Signed-off-by:
Serge E. Hallyn <serge.hallyn@ubuntu.com> Signed-off-by:
Andy Whitcroft <apw@canonical.com> Signed-off-by:
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Takuya Yoshikawa authored
em_push() is a simple wrapper of emulate_push(). So this patch replaces emulate_push() with em_push() and removes the unnecessary former. In addition, the unused ops arguments are removed from emulate_pusha() and emulate_grp45(). Signed-off-by:
Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by:
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Takuya Yoshikawa authored
PUSH emulation stores the value by calling writeback() after setting the dst operand appropriately in emulate_push(). This writeback() using dst is not needed at all because we know the target is the stack. So this patch makes emulate_push() call, newly introduced, segmented_write() directly. By this, many inlined writeback()'s are removed. Signed-off-by:
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Takuya Yoshikawa authored
This stops "CMP r/m, reg" to write back the data into memory. Pointed out by Avi. The writeback suppression now covers CMP, CMPS, SCAS. Signed-off-by:
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Jan Kiszka authored
In case certain allocations fail, vmx_create_vcpu may return 0 as error instead of a negative value encoded via ERR_PTR. This causes a NULL pointer dereferencing later on in kvm_vm_ioctl_vcpu_create. Reported-by:
Sasha Levin <levinsasha928@gmail.com> Signed-off-by:
Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by:
Marcelo Tosatti <mtosatti@redhat.com>
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Gleb Natapov authored
Currently we sync registers back and forth before/after exiting to userspace for IO, but during IO device model shouldn't need to read/write the registers, so we can as well skip those sync points. The only exaception is broken vmware backdor interface. The new code sync registers content during IO only if registers are read from/written to by userspace in the middle of the IO operation and this almost never happens in practise. Signed-off-by:
Gleb Natapov <gleb@redhat.com> Signed-off-by:
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Avi Kivity authored
Signed-off-by: -
Avi Kivity authored
For reuse later. Signed-off-by: -
Avi Kivity authored
So it can call emulate_gp() without forward declarations. Signed-off-by: -
Avi Kivity authored
Needed for segment read/write checks. Signed-off-by: -
Avi Kivity authored
Preparing to add segment checks. Signed-off-by: -
Avi Kivity authored
It's going to get more complicated soon. Signed-off-by: -
Avi Kivity authored
Will help later adding proper segment checks. Signed-off-by: -
Joerg Roedel authored
When the emulation of vmload or vmsave fails because the guest passed an unsupported physical address it gets an #GP with rip pointing to the instruction after vmsave/vmload. This is a bug and fixed by this patch. Signed-off-by:
Joerg Roedel <joerg.roedel@amd.com> Signed-off-by:
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Joerg Roedel authored
This patch implements two new vm-ioctls to get and set the virtual_tsc_khz if the machine supports tsc-scaling. Setting the tsc-frequency is only possible before userspace creates any vcpu. Signed-off-by:
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Joerg Roedel authored
With TSC scaling in SVM the tsc-offset needs to be calculated differently. This patch propagates this calculation into the architecture specific modules so that this complexity can be handled there. Signed-off-by:
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Joerg Roedel authored
This patch implements a call-back into the architecture code to allow the propagation of changes to the virtual tsc_khz of the vcpu. On SVM it updates the tsc_ratio variable, on VMX it does nothing. Signed-off-by:
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Joerg Roedel authored
The calculation of the tsc_delta value to ensure a forward-going tsc for the guest is a function of the host-tsc. This works as long as the guests tsc_khz is equal to the hosts tsc_khz. With tsc-scaling hardware support this is not longer true and the tsc_delta needs to be calculated using guest_tsc values. Signed-off-by:
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Joerg Roedel authored
This patch changes the kvm_guest_time_update function to use TSC frequency the guest actually has for updating its clock. Signed-off-by:
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Joerg Roedel authored
This patch enhances the kvm_amd module with functions to support the TSC_RATE_MSR which can be used to set a given tsc frequency for the guest vcpu. Signed-off-by:
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Avi Kivity authored
VMMCALL requires EFER.SVME to be enabled in the host, not in the guest, which is what check_svme() checks. Signed-off-by: -
Avi Kivity authored
VMMCALL needs the VendorSpecific tag so that #UD emulation (called if a guest running on AMD was migrated to an Intel host) is allowed to process the instruction. Signed-off-by: -
Bharat Bhushan authored
Following dump is observed on host when clearing the exit timing counters [root@p1021mds kvm]# echo -n 'c' > vm1200_vcpu0_timing INFO: task echo:1276 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. echo D 0ff5bf94 0 1276 1190 0x00000000 Call Trace: [c2157e40] [c0007908] __switch_to+0x9c/0xc4 [c2157e50] [c040293c] schedule+0x1b4/0x3bc [c2157e90] [c04032dc] __mutex_lock_slowpath+0x74/0xc0 [c2157ec0] [c00369e4] kvmppc_init_timing_stats+0x20/0xb8 [c2157ed0] [c0036b00] kvmppc_exit_timing_write+0x84/0x98 [c2157ef0] [c00b9f90] vfs_write+0xc0/0x16c [c2157f10] [c00ba284] sys_write+0x4c/0x90 [c2157f40] [c000e320] ret_from_syscall+0x0/0x3c The vcpu->mutex is used by kvm_ioctl_* (KVM_RUN etc) and same was used when clearing the stats (in kvmppc_init_timing_stats()). What happens is that when the guest is idle then it held the vcpu->mutx. While the exiting timing process waits for guest to release the vcpu->mutex and a hang state is reached. Now using seprate lock for exit timing stats. Signed-off-by:Bharat Bhushan <Bharat.Bhushan@freescale.com> Acked-by:
Alexander Graf <agraf@suse.de> Signed-off-by:
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Xiao Guangrong authored
The mmu_seq verification can be removed since we get the pfn in the protection of mmu_lock. Signed-off-by:
Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> Signed-off-by:
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Gleb Natapov authored
Signed-off-by:
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Justin P. Mattock authored
The patch below removes unsigned long base_addresss; in i8254.h since it is unused. Signed-off-by:
Justin P. Mattock <justinmattock@gmail.com> Signed-off-by:
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Joerg Roedel authored
This patch removes all the old code which handled the nested selective cr0 write intercepts. This code was only in place as a work-around until the instruction emulator is capable of doing the same. This is the case with this patch-set and so the code can be removed. Signed-off-by:
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Joerg Roedel authored
This patch adds code to check for IOIO intercepts on instructions decoded by the KVM instruction emulator. [avi: fix build error due to missing #define D2bvIP] Signed-off-by:
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Joerg Roedel authored
This patch add intercept checks for emulated one-byte instructions to the KVM instruction emulation path. Signed-off-by:
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Joerg Roedel authored
This patch adds intercepts checks for the remaining twobyte instructions to the KVM instruction emulator. Signed-off-by:
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Joerg Roedel authored
This patch implements the emulator intercept checks for the RDTSCP, MONITOR, and MWAIT instructions. Signed-off-by:
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Joerg Roedel authored
This patch adds the necessary code changes in the instruction emulator and the extensions to svm.c to implement intercept checks for the svm instructions. Signed-off-by:
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Joerg Roedel authored
This patch add intercept checks into the KVM instruction emulator to check for the 8 instructions that access the descriptor table addresses. Signed-off-by:
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Joerg Roedel authored
This patch adds the intercept checks for instruction accessing the debug registers. Signed-off-by:
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Joerg Roedel authored
This patch adds all necessary intercept checks for instructions that access the crX registers. Signed-off-by:
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Joerg Roedel authored
This patch adds a callback into kvm_x86_ops so that svm and vmx code can do intercept checks on emulated instructions. Signed-off-by:
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Joerg Roedel authored
This patch adds a flag for the opcoded to tag instruction which are only recognized in protected mode. The necessary check is added too. Signed-off-by:
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Joerg Roedel authored
This patch adds a check_perm callback for each opcode into the instruction emulator. This will be used to do all necessary permission checks on instructions before checking whether they are intercepted or not. Signed-off-by:
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Joerg Roedel authored
This patch prevents the changed CPU state to be written back when the emulator detected that the instruction was intercepted by the guest. Signed-off-by:
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