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Merge branch 'kvm-amd-fixes' into HEAD

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This commit is contained in:
Paolo Bonzini
2020-05-13 12:14:05 -04:00
parent 7c67f54661 37486135d3
commit 4aef2ec902
4723 changed files with 185478 additions and 69840 deletions
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39
arch/x86/kvm/svm/nested.c
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@@ -19,6 +19,7 @@
#include <linux/kernel.h>
#include <asm/msr-index.h>
#include <asm/debugreg.h>
#include "kvm_emulate.h"
#include "trace.h"
@@ -271,7 +272,7 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
svm->vmcb->save.rsp = nested_vmcb->save.rsp;
svm->vmcb->save.rip = nested_vmcb->save.rip;
svm->vmcb->save.dr7 = nested_vmcb->save.dr7;
svm->vmcb->save.dr6 = nested_vmcb->save.dr6;
svm->vcpu.arch.dr6 = nested_vmcb->save.dr6;
svm->vmcb->save.cpl = nested_vmcb->save.cpl;
svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
@@ -490,7 +491,7 @@ int nested_svm_vmexit(struct vcpu_svm *svm)
nested_vmcb->save.rsp = vmcb->save.rsp;
nested_vmcb->save.rax = vmcb->save.rax;
nested_vmcb->save.dr7 = vmcb->save.dr7;
nested_vmcb->save.dr6 = vmcb->save.dr6;
nested_vmcb->save.dr6 = svm->vcpu.arch.dr6;
nested_vmcb->save.cpl = vmcb->save.cpl;
nested_vmcb->control.int_ctl = vmcb->control.int_ctl;
@@ -614,26 +615,45 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
/* DB exceptions for our internal use must not cause vmexit */
static int nested_svm_intercept_db(struct vcpu_svm *svm)
{
unsigned long dr6;
unsigned long dr6 = svm->vmcb->save.dr6;
/* Always catch it and pass it to userspace if debugging. */
if (svm->vcpu.guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
return NESTED_EXIT_HOST;
/* if we're not singlestepping, it's not ours */
if (!svm->nmi_singlestep)
return NESTED_EXIT_DONE;
goto reflected_db;
/* if it's not a singlestep exception, it's not ours */
if (kvm_get_dr(&svm->vcpu, 6, &dr6))
return NESTED_EXIT_DONE;
if (!(dr6 & DR6_BS))
return NESTED_EXIT_DONE;
goto reflected_db;
/* if the guest is singlestepping, it should get the vmexit */
if (svm->nmi_singlestep_guest_rflags & X86_EFLAGS_TF) {
disable_nmi_singlestep(svm);
return NESTED_EXIT_DONE;
goto reflected_db;
}
/* it's ours, the nested hypervisor must not see this one */
return NESTED_EXIT_HOST;
reflected_db:
/*
* Synchronize guest DR6 here just like in kvm_deliver_exception_payload;
* it will be moved into the nested VMCB by nested_svm_vmexit. Once
* exceptions will be moved to svm_check_nested_events, all this stuff
* will just go away and we could just return NESTED_EXIT_HOST
* unconditionally. db_interception will queue the exception, which
* will be processed by svm_check_nested_events if a nested vmexit is
* required, and we will just use kvm_deliver_exception_payload to copy
* the payload to DR6 before vmexit.
*/
WARN_ON(svm->vcpu.arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT);
svm->vcpu.arch.dr6 &= ~(DR_TRAP_BITS | DR6_RTM);
svm->vcpu.arch.dr6 |= dr6 & ~DR6_FIXED_1;
return NESTED_EXIT_DONE;
}
static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
@@ -690,6 +710,9 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
if (svm->nested.intercept_exceptions & excp_bits) {
if (exit_code == SVM_EXIT_EXCP_BASE + DB_VECTOR)
vmexit = nested_svm_intercept_db(svm);
else if (exit_code == SVM_EXIT_EXCP_BASE + BP_VECTOR &&
svm->vcpu.guest_debug & KVM_GUESTDBG_USE_SW_BP)
vmexit = NESTED_EXIT_HOST;
else
vmexit = NESTED_EXIT_DONE;
}