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i386: hvf: Make long mode enter and exit clearer 

Intel SDM "9.8.5 Initializing IA-32e Mode" and "9.8.5.4 Switching Out of
IA-32e Mode Operation" define activation and deactivation of long mode
only upon a change of CR0.PG but current code invokes exit_long_mode()
unconditionally until LME is cleared.

Signed-off-by: Cameron Esfahani <dirty@apple.com>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Message-Id: <20200630102824.77604-6-r.bolshakov@yadro.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cameron Esfahani 2020-06-30 13:28:20 +03:00 committed by Paolo Bonzini
parent 5536c98e44
commit a4e26fa858
1 changed files with 7 additions and 5 deletions
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12
target/i386/hvf/vmx.h
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@ -121,6 +121,7 @@ static inline void macvm_set_cr0(hv_vcpuid_t vcpu, uint64_t cr0)
uint64_t pdpte[4] = {0, 0, 0, 0};
uint64_t efer = rvmcs(vcpu, VMCS_GUEST_IA32_EFER);
uint64_t old_cr0 = rvmcs(vcpu, VMCS_GUEST_CR0);
uint64_t changed_cr0 = old_cr0 ^ cr0;
uint64_t mask = CR0_PG | CR0_CD | CR0_NW | CR0_NE | CR0_ET;
if ((cr0 & CR0_PG) && (rvmcs(vcpu, VMCS_GUEST_CR4) & CR4_PAE) &&
@ -138,11 +139,12 @@ static inline void macvm_set_cr0(hv_vcpuid_t vcpu, uint64_t cr0)
wvmcs(vcpu, VMCS_CR0_SHADOW, cr0);
if (efer & MSR_EFER_LME) {
if (!(old_cr0 & CR0_PG) && (cr0 & CR0_PG)) {
enter_long_mode(vcpu, cr0, efer);
}
if (/*(old_cr0 & CR0_PG) &&*/ !(cr0 & CR0_PG)) {
exit_long_mode(vcpu, cr0, efer);
if (changed_cr0 & CR0_PG) {
if (cr0 & CR0_PG) {
enter_long_mode(vcpu, cr0, efer);
} else {
exit_long_mode(vcpu, cr0, efer);
}
}
}