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target-i386: kvm: Increase MSR_BUF_SIZE 

We are dangerously close to the array limits in kvm_put_msrs()
and kvm_get_msrs(): with the default mcg_cap configuration, we
can set up to 148 MSRs in kvm_put_msrs(), and if we allow mcg_cap
to be changed, we can write up to 236 MSRs.

Use 4096 bytes for the buffer, that can hold 255 kvm_msr_entry
structs.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Eduardo Habkost 2015-12-16 17:06:43 -02:00
parent d71b62a165
commit d1138251bf
1 changed files with 3 additions and 2 deletions
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5
target-i386/kvm.c
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@ -57,8 +57,9 @@
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
#define MSR_BUF_SIZE \
(sizeof(struct kvm_msrs) + 150 * sizeof(struct kvm_msr_entry))
/* A 4096-byte buffer can hold the 8-byte kvm_msrs header, plus
* 255 kvm_msr_entry structs */
#define MSR_BUF_SIZE 4096
#ifndef BUS_MCEERR_AR
#define BUS_MCEERR_AR 4