diff options
| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2018-06-20 22:00:47 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-15 18:14:48 +0200 |
| commit | 5d3eaa2d3935e9a5be2dd7186962e72e475d5966 (patch) | |
| tree | 7d9476171b20bab7e050b38214d5d3510e81e620 /arch | |
| parent | 1555f9e8ed973df3e4a5aecc37cdb6d48469d366 (diff) | |
x86/KVM/VMX: Separate the VMX AUTOLOAD guest/host number accounting
commit 3190709335dd31fe1aeeebfe4ffb6c7624ef971f upstream
This allows to load a different number of MSRs depending on the context:
VMEXIT or VMENTER.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 29 |
1 files changed, 19 insertions, 10 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 1efd6697337f..e4ccb931ab40 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2011,12 +2011,18 @@ static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr) } i = find_msr(&m->guest, msr); if (i < 0) - return; + goto skip_guest; --m->guest.nr; - --m->host.nr; m->guest.val[i] = m->guest.val[m->guest.nr]; - m->host.val[i] = m->host.val[m->host.nr]; vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); + +skip_guest: + i = find_msr(&m->host, msr); + if (i < 0) + return; + + --m->host.nr; + m->host.val[i] = m->host.val[m->host.nr]; vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); } @@ -2034,7 +2040,7 @@ static void add_atomic_switch_msr_special(struct vcpu_vmx *vmx, static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, u64 guest_val, u64 host_val) { - int i; + int i, j; struct msr_autoload *m = &vmx->msr_autoload; switch (msr) { @@ -2070,21 +2076,24 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr, } i = find_msr(&m->guest, msr); - if (i == NR_AUTOLOAD_MSRS) { + j = find_msr(&m->host, msr); + if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) { printk_once(KERN_WARNING "Not enough msr switch entries. " "Can't add msr %x\n", msr); return; - } else if (i < 0) { + } + if (i < 0) { i = m->guest.nr++; - ++m->host.nr; vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->guest.nr); + } + if (j < 0) { + j = m->host.nr++; vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->host.nr); } - m->guest.val[i].index = msr; m->guest.val[i].value = guest_val; - m->host.val[i].index = msr; - m->host.val[i].value = host_val; + m->host.val[j].index = msr; + m->host.val[j].value = host_val; } static void reload_tss(void) |