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| author | Sean Christopherson <seanjc@google.com> | 2025-06-10 15:57:12 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2025-06-20 13:05:40 -0700 |
| commit | b1bccf78839080a93898342cf1a613c38e871f75 (patch) | |
| tree | 2bb6119ff49e172e5695d2e0de364358c766e8b5 /arch/x86/kvm/svm/svm.c | |
| parent | KVM: SVM: Kill the VM instead of the host if MSR interception is buggy (diff) | |
| download | linux-b1bccf78839080a93898342cf1a613c38e871f75.tar.gz linux-b1bccf78839080a93898342cf1a613c38e871f75.zip | |
KVM: x86: Use non-atomic bit ops to manipulate "shadow" MSR intercepts
Manipulate the MSR bitmaps using non-atomic bit ops APIs (two underscores),
as the bitmaps are per-vCPU and are only ever accessed while vcpu->mutex is
held.
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Link: https://lore.kernel.org/r/20250610225737.156318-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm/svm.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 60de360e3389..9dce32cae485 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -783,14 +783,14 @@ static void set_shadow_msr_intercept(struct kvm_vcpu *vcpu, u32 msr, int read, /* Set the shadow bitmaps to the desired intercept states */ if (read) - set_bit(slot, svm->shadow_msr_intercept.read); + __set_bit(slot, svm->shadow_msr_intercept.read); else - clear_bit(slot, svm->shadow_msr_intercept.read); + __clear_bit(slot, svm->shadow_msr_intercept.read); if (write) - set_bit(slot, svm->shadow_msr_intercept.write); + __set_bit(slot, svm->shadow_msr_intercept.write); else - clear_bit(slot, svm->shadow_msr_intercept.write); + __clear_bit(slot, svm->shadow_msr_intercept.write); } static bool valid_msr_intercept(u32 index) @@ -856,8 +856,8 @@ static void set_msr_interception_bitmap(struct kvm_vcpu *vcpu, u32 *msrpm, bit_write = 2 * (msr & 0x0f) + 1; tmp = msrpm[offset]; - read ? clear_bit(bit_read, &tmp) : set_bit(bit_read, &tmp); - write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp); + read ? __clear_bit(bit_read, &tmp) : __set_bit(bit_read, &tmp); + write ? __clear_bit(bit_write, &tmp) : __set_bit(bit_write, &tmp); msrpm[offset] = tmp; |