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target/i386: add support for MSR_IA32_TSX_CTRL

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The MSR_IA32_TSX_CTRL MSR can be used to hide TSX (also known as the
Trusty Side-channel Extension).  By virtualizing the MSR, KVM guests
can disable TSX and avoid paying the price of mitigating TSX-based
attacks on microarchitectural side channels.

Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-11-20 13:19:22 +01:00
parent 0723cc8a55
commit 2a9758c51e
4 changed files with 39 additions and 1 deletions
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5
target/i386/cpu.h
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@ -349,7 +349,11 @@ typedef enum X86Seg {
#define MSR_VIRT_SSBD 0xc001011f
#define MSR_IA32_PRED_CMD 0x49
#define MSR_IA32_CORE_CAPABILITY 0xcf
#define MSR_IA32_ARCH_CAPABILITIES 0x10a
#define ARCH_CAP_TSX_CTRL_MSR (1<<7)
#define MSR_IA32_TSX_CTRL 0x122
#define MSR_IA32_TSCDEADLINE 0x6e0
#define FEATURE_CONTROL_LOCKED (1<<0)
@ -1449,6 +1453,7 @@ typedef struct CPUX86State {
uint64_t msr_smi_count;
uint32_t pkru;
uint32_t tsx_ctrl;
uint64_t spec_ctrl;
uint64_t virt_ssbd;